specifications - esi.info · using alphacrete acoustic block® means that spaces can be designed...

ALPHACRETE

ACOUSTIC BLOCK®

SPECIFICATIONS

www.acheson-glover.com

CI/SfB

UniclassL322:N373

(P3)Ff2

ContentsIntroduction 03

Alphacrete Acoustic Block® 05

Building Applications 07

Colour Ranges 09

Sound Absorption 12

Sound Insulation 13

The Case For Use 14

Technical Information 16

Design & Detailing 19

Structural Performance 22

Fixings 24

Service & Fittings 25

The Environment 26

NOTES

COLOURS & FINISHESThe colours shown in this literature are as accurate as theprinting process will allow. Whilst every effort is made to matchcolours and represent textures, we recommend that coloursand textures are chosen from actual samples of the products.All products are manufactured from natural materials andalthough we strive to provide consistency of colour, variationmay occur in the manufacturing process. It is for this reasonthat we recommend that products are selected from at leastthree bales, within each delivery. This will eliminate 'banding'.

GENERAL

All information contained in this brochure is correct at the timeof going to print. We recommend that you contact our salesstaff for further information at the design stage of your projectfor the most up to date information. A&G reserves the right todiscontinue products if necessary.


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Acheson & Glover

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Acheson & Glover

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About Acheson & GloverEstablished in 1960, Acheson & Glover (A&G) has spent over50 years designing and manufacturing a wide range ofproducts and solutions in concrete for both the residentialand the commercial sectors and are recognised as one ofthe most trusted concrete producers in the UK and Ireland.

Through advances in manufacturing technology and astringent quality control that stretches all the way from thequarry to the final product, we have a team of people whohave the skills and imagination to not only rethink and re-engineer in concrete, but also to redefine it.

Acoustic Block, Ernestone Buff

Alphacrete® Acoustic is a unique masonry block specially developed tohelp control reverberation time. Independent tests have concluded thatit meets the acoustic standards of the Department of Education’sPriority School Building Programme (PSBP).

Acoustic Performance Standards for the PSBP 2012 supersedes Section1A Building Bulletin 93 (BB93). The new Acoustic Performance Standardstates that, “successful designs for sports halls should include fair facedClass D absorbent blockwork from ground floor up to 3m in addition toClass C perforated roof liner.”

A&G’s Alphacrete Acoustic Block® will enable designers to fully complywith the requirements of PSBP 2012 thus addressing the issue of poorsound quality often found in halls and corridors. While at the same timemaintaining the high quality, prefinished, low maintenance appearanceof the Alphacrete® range.

ALPHACRETE ACOUSTIC BLOCK®

We are the expertsin acoustic blocks

www.acheson-glover.com/cemarking

ALPHACRETEACOUSTIC BLOCK®

OUTSTANDING ACOUSTICPERFORMANCE

The number of hard surfaces in schools and sports halls makethem extremely live environments as far as sound isconcerned. The acoustic environment inside a hall is primarilyjudged by its reverberation time. This is the time in secondsthat it takes for a sound to decay by 60dB or a millionth of itsenergy level once the original sound has ceased.

The installation of the Alphacrete Acoustic block® will have anumber of effects. The primary effect is to reduce thereverberation in the hall thereby significantly reducing theamplified airborne sound energy. In addition, the flutterechoes and standing waves produced by reflective parallelwall surfaces will be significantly reduced.

The overall result is reduced distraction fromairborne noise together with improved speechintelligibility. A considerable reduction inreverberant noise levels will be achieved.

Using Alphacrete Acoustic Block® means that spacescan be designed and built to have an acousticperformance appropriate to the size of the space aswell as its intended use.

< Acoustic Block, Verona Sand

Acoustic Block, Ernestone Buff


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Acheson & Glover

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We are the expertsin acoustic blocks

Athena Finish Corinthian Finish

Acheson & Glover

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BUILDINGAPPLICATIONS

THE PERFECTFINISH

Acoustic Block’s versatile design satisfies acoustic requirementsin a multitude of building applications:

• School Gymnasia / Classrooms, etc.

• Multi-purpose Halls (Church Halls / Concert Halls, Town Halls & Sports Halls.)

• Swimming Pools

• Fitness Suites

• Atria

• Commercial & Domestic Circulation Spaces (Stairwells)

• Libraries

• Cinemas

• Environmental Noise Barriers

Superb acoustic performance without compromising on eitheraesthetic appeal or practicality. Acoustic block will provide youwith a maintenance free finished surface, with excellent soundabsorption, sound reduction, fire resistance and load bearingabilities.

Available in two finishes: ATHENA - with a fine surface andsharp clean lines, Athena will give a crisp contemporary feel.CORINTHIAN - with a dimpled texture giving a weatheredappearance, Corinthian will add character to a structure.

< Acoustic Block, Ernestone Buff & Palazzo Sepia


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Acheson & Glover

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Athena

Venetian RedRecommended Mortar: Y25 Terracotta

Verona SandRecommended Mortar: Y35 Yellow

Sienna VeroneseRecommended Mortar: Y126 Terracotta

Pantheon AmberRecommended Mortar: Y7 Light Brown

Ernestone BuffRecommended Mortar: Y110 Ernestone (use with White Cement)

Palazzo SepiaRecommended Mortar: Y83 Dark Brown

Minerva BasaltRecommended Mortar: Y3 Charcoal

Sporting GreenRecommended Mortar: Y200 Mint Green (use with White Cement)

Baroque TerracottaRecommended Mortar: Y22 Tan

Francesco AshRecommended Mortar: Standard

COLOURRANGES

< Acoustic Block, Classico Blanco & Minerva Basalt

SPORTING GREEN BLOCKA&G have developed the Sporting Green colour tohelp achieve the requirement as prescribed by SportEngland in the design guidance notes (section 5)February 2011. A&G’s Sporting Green colour will givesufficient contrast against sporting accessories.Further to this, the finish of the block work will givea uniform look across all planes adding aestheticvalue to the project.

All mortar recommendations refer to A&G mortarcodes. Always check with your own mortar supplierfor the correct code for the colour you require.

NB. Cement is not included in A&G’s coloured lime sand mortar.

Please note minimum order quantitiesare required for all colours. We adviseyou speak to a member of the salesteam in advance of order placement.>>

All mortar recommendations should be used with ordinary Portland Cement with the exception of Y100 White forClassico Blanco, Y200 Mint Green for Sporting Green and Y110 Ernestone for Ernestone Buff which should bemixed using White Cement.

All faces can be exposed excluding the top and bottom of the unit.

Classico BlancoRecommended Mortar: Y100 White (use with White Cement)

Acheson & Glover

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Corinthian

Venetian RedRecommended Mortar: Y25 Terracotta

Sienna VeroneseRecommended Mortar: Y126 Terracotta

Baroque TerracottaRecommended Mortar: Y99 Tan

Minerva BasaltRecommended Mortar: Y4 Charcoal

Verona SandRecommended Mortar: Y35 Yellow

Pantheon AmberRecommended Mortar: Y162 Lilac Brown

Detail Block: Venetian RedRecommended Mortar: Y126 Terracotta

Sporting GreenRecommended Mortar: Y200 Mint Green(use with White Cement)

Ernestone BuffRecommended Mortar: Y110 Ernestone(use with White Cement)

Palazzo SepiaRecommended Mortar: Y86 Lilac Brown

RicottaRecommended Mortar: Y3 Charcoal

PalentoRecommended Mortar: Y100 White(use with White Cement)

All faces can be exposed excluding the top andbottom of the unit. However, only one face will havethe Corinthian finish unless otherwise requested.

All mortar recommendations refer to A&G mortarcodes. Always check with your own mortar supplierfor the correct code for the colour you require.

All mortar recommendations should be used with ordinary Portland Cement with the exception of Y100 Whitefor Classico Blanco / Palento, Y200 Mint Green for Sporting Green and Y110 Ernestone for Ernestone Buff whichshould be mixed using White Cement.

Classico BlancoRecommended Mortar: Y100 White (use with White Cement)

Francesco AshRecommended Mortar: Standard

RubiaRecommended Mortar: Y22 Tan

DETAIL BLOCKVarious features can be produced within the Corinthianrange and can be used as a string course to break uplarge elevations or add emphasis to the overall design.Detail block is available in all of the Corinthian Colours.

N.B. Other designs can be produced on request.

SPORTING GREEN BLOCKSee page 9 for more information.

< Acoustic Block, Ernestone Buff

NB. Cement is not included in A&G’scoloured lime sand mortar.


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Overall Values 215mm 140mm

NRC (ASTM C423) 0.35 0.40αw (EN ISO 11654) 0.40 0.40

Class D

Octave Band Values 215mm 140mm

125 0.30 0.35

250 0.35 0.35

500 0.35 0.35

1k 0.40 0.40

2k 0.45 0.45

4k 0.55 0.35

Overall Values 215mm 140mm

NRC (ASTM C423) 0.25 0.25αw (EN ISO 11654) 0.30 0.30

Class D

Octave Band Values 215mm 140mm

125 0.20 0.30

250 0.20 0.30

500 0.25 0.25

1k 0.25 0.25

2k 0.35 0.30

4k 0.45 0.35

The absorbent characteristics and sound reduction indicesof the blocks were measured in Sound ResearchLaboratories’ UKAS accredited test facility. Full test reportsare available on request.

All measurements of sound absorption were performed inaccordance with the guidance set down in BS EN ISO 354:2003 - Acoustics - Measurement of sound absorption in areverberation room.

SOUNDABSORPTION

ATHENA FINISH - A308 / A208 Ernestone Buff / Classico Blanco

ATHENA FINISH - A308 / A208 All colours excluding Ernestone Buff & Classico Blanco (see pages 9 and 11)

Overall Values 215mm

NRC (ASTM C423) 0.30αw (EN ISO 11654) 0.35

Class D

Octave Band Values 215mm

125 0.25

250 0.30

500 0.30

1k 0.35

2k 0.35

4k 0.35

CORINTHIAN FINISH - C308 Ernestone Buff / Classico Blanco

A208A308KEY: C308 140mmA208A308KEY:

Frequency (Hz)

140mm 215mm

63 31 34.8

125 28.3 28.9

250 32 36.8

500 37.7 43.8

1k 43.7 50.5

2k 46.2 54.7

4k 52.1 61.3

8k 60.7 69.6

140mm: Rw (C;Ctr) = 42 (-1;-4) dB

215mm: Rw (C;Ctr) = 47 (-1;-6) dB

TEST 2: CAVITY WALL COMPRISING 215MM ACOUSTIC BLOCK A308, 125MMCAVITY FILLED WITH DRITHERM CAVITY SLAB, P100 MINERVA BASALT BLOCKS

TEST 1: SINGLE SKIN OF 215MM & 140MM ACOUSTIC BLOCK A308 & A208

TEST 3: A208 CLASSICO BLANCO 140MM BLOCKS, 125MM CAVITY FILLED WITH 75MM DRITHERM CAVITY SLAB, P100 MINERVA BASALT BLOCKS

All measurements of sound transmission were performed inaccordance with the guidance set down in BS EN ISO 140:1995: Acoustics - Measurement of sound insulation inbuildings and of building elements, Part 3 - Laboratorymeasurement of airborne sound insulation of buildingelements. The single figure index RW was calculated inaccordance with BS EN ISO 717: 1997: Acoustics - Rating of

sound insulation in buildings and of building elements, Part 1 -Airborne sound insulation.

Alphacrete Acoustic block® offers excellent resistance to thetransmission of airborne sound. The following table showsaverage sound reduction values for this block over the rangeof frequencies.

SOUNDINSULATION

Sound ReductionIndex (dB)

Frequency Sound Reduction (Hz) Index (dB)

63 47.4

125 48.3

250 48.8

500 53.2

1k 61.4

2k 68.2

4k 76.2

8k 79.5

Rw (C;Ctr) = 59 (-1;-4) dB

Frequency Sound Reduction(Hz) Index (dB)

63 35.5

125 37.8

250 41.2

500 47.3

1k 55.6

2k 64.7

4k 73.4

8k 74.9

Rw (C;Ctr) = 52 (-1;-4) dB

Figure 2 Cavity wall with blocks

Figure 1 Single skin

A308 A208

Rock WoolInsulation

A308 / A208

BlockWork P100

125mm Rock WoolInsulation

A308

Stately BrickBarkleyManor


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KEY

A308 Ernestone

A208 Ernestone

Fair-faced concrete

Fair-faced brick

Painted concrete block

There are examples of typical constructions in BB93 in whichthe amount and type of additional sound absorptivematerials required to achieve compliance can be determinedusing standard Sabine formula. A&G advocates the use of amodified Sabine formula which takes into account the sound

absorption capability of the air, which is more influential athigh frequencies and in large areas such as school halls.

Two such examples using this “Revtime” software areconsidered opposite.

TEST 4: CAVITY WALL COMPRISING 215MM THICK ACOUSTIC BLOCK A308,125MM CAVITY FILLED WITH DRITHERM CAVITY SLAB, 102.5MM THICKBARKLEY MANOR BRICKS

Figure 3 Cavity wall with bricks

140mmA208A308KEY:

A TECHNICAL AND ECONOMICAL ALTERNATIVETO CONVENTIONAL SOLUTIONS - THE EVIDENCE.

By comparison with typical sound absorption data listed inBB93 ‘Acoustic Design of Schools’ the performance of the

Alphacrete Acoustic block® is seen to be significantly betterthan that of other brick / block materials commonly used inconstruction.

THE CASEFOR USE

Frequency Sound Reduction(Hz) Index (dB)

63 48.6

125 45

250 45.7

500 49.2

1k 60

2k 68.1

4k 76.9

8k 80.4

Rw (C;Ctr) = 56 (-1;-4) dB

For such structures, a mid-frequency reverberation time, Tmf,of less than 0.8 seconds is required under BB93 in order toachieve compliance, with the performance at 125Hz and250Hz being no more than 30% higher than Tmf. In BB93 inorder to bring reverberation times down to this level, the use

EXAMPLE 1: SCHOOL CLASSROOM (6m x 5m x 3m)

of 26m2 of absorbent ceiling panels together with 16m2 ofabsorbent wall panels is demonstrated. Using AlphacreteAcoustic block® in place of the absorbent ceiling and wallpanels as well as the painted blockwork yields a resultexhibiting compliance, as shown below.

For such structures, a mid-frequency reverberation time, Tmf,of between 0.8 seconds and 1.2 seconds is required underBB93 in order to achieve compliance, with the performance at125Hz and 250Hz being no more than 50% higher than Tmf.

In BB93, in order to bring reverberation times down to thislevel, the use of 52m2 of absorbent ceiling panels together with

EXAMPLE 2: SCHOOL ASSEMBLY HALL (16m x 12m x 6m)

90m2 of absorbent wall panels is demonstrated. UsingAlphacrete Acoustic block® in place of the absorbent wallpanels and the original fair-faced blockwork not only yields aresult exhibiting compliance as shown below, but introducessignificant cost savings.

In both these examples there are savings on materials usageas well as on finishing costs. Alphacrete Acoustic block®

requires no finishing and/or subsequent redecoration. For this particular example of a school assembly hall it isestimated that savings of around £4.5K can be achievedwith no ongoing maintenance costs.

‘Revtime’ calculations can be carried out on your project todemonstrate compliance with BB93. For advice upon thecorrect amount of Alphacrete Acoustic block® required orfor further information, please contact A&G and speak toone of our Specification Managers.

OCTAVE BAND CENTRE FREQUENCY (HZ)

Area / Vol 125 250 500 1k 2k

ABSORPTION COEFFICIENTS

A308 Ernestone Buff 76m2 0.30 0.35 0.35 0.40 0.45

Carpet on concrete floor (BB93 - A10.12) 56m2 0.05 0.05 0.10 0.20 0.45

Glazing (BB93 - A10.12) 14m2 0.10 0.07 0.05 0.03 0.02

Suspended plaster or plasterboard ceiling with large airspace (BB93 - A10.12) 56m2 0.20 0.15 0.10 0.05 0.05

Air at 20 C and 60% RH 168m3

REVERBERATION TIMES

T (sec) 0.71 0.70 0.70 0.60 0.43

Tmf (sec) 0.58

OCTAVE BAND CENTRE FREQUENCY (HZ)

Area / Vol 125 250 500 1k 2k

ABSORPTION COEFFICIENTS

A308 Ernestone Buff 260m2 0.30 0.35 0.35 0.40 0.45

Parquet on concrete floor (BB93 - A10.13) 192m2 0.04 0.04 0.07 0.06 0.06

Glazing (BB93 - A10.13) 76m2 0.15 0.05 0.03 0.03 0.02

Suspended plaster or plasterboard ceiling with large airspace (BB93 - A10.13) 140m2 0.20 0.15 0.10 0.05 0.05

Absorbent ceiling (BB93 - A10.13) 52m2 0.51 0.68 0.85 0.92 1.00

Air at 20 C and 60% RH 1152m3

REVERBERATION TIMES

T (sec) 1.22 1.17 1.12 1.07 0.96

Tmf (sec) 1.05

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NBS PLUS: F10 15

BS EN: BS EN771-3: 2003 / Tolerances: D2 to BS EN 771-3:2003

CARBON: A308 (HOLLOW 440 X 215 X 140) 30.5Kg CO2 per m2

A208 (HOLLOW 440 X 215 X 215) 20.4Kg CO2 per m2

TECHNICALINFORMATION

LINTEL HALF BOND HALF LENGTH SILL SILLLINTEL BEAM SILL EXTERNAL INTERNAL

(MOULDED FACE) CORNERS CORNERS

140mm High Rise High Rise High Rise

215

21

5

25

10

0

LINTEL HALF BOND HALF LENGTH SILL SILLLINTEL BEAM SILL EXTERNAL INTERNAL

(MOULDED FACE) CORNERS CORNERS

215mm High Rise High Rise High Rise

SPECIALS - PROFILES:

215

21

5

115

11

5

215mm

ACOUSTIC BLOCK:

140mm

COMPRESSIVE DENSITYSTRENGTH

10 N/mm2 2000 kg/m3

Table showing the weight of AcousticBlock in kgs/m2 of Erected Wall

WALL THICKNESS HOLLOW

215mm 270 kgs/m2

140mm 195 kgs/m2

Dimensions

STANDARD

Actual Size 440 x 215 mm

Co-ordinating Size 450 x 225 mm

COVERAGE:

STANDARD: 450 x 225 = 9.88 blocks/m2 i.e. 100m2 = 988 blocksManufactured in accordance to BS EN 771-3: 2003 Specification for Masonry Units.

WATER ABSORPTION

When independently tested, Acoustic block was found to have a very lowabsorption rate.

DRYING SHRINKAGE

The Drying Shrinkage value of Acoustic block is important as this affects theamount of shrinkage which takes place in panels of masonry. Values forAlphacrete® are typically less than 0.04%.

Full range of architectural masonry specials can be used with Acoustic blocks.

AIR TIGHTNESS:

Alphacrete Acoustic block® is suitable for use in buildings which have an airtightness requirement. The company carry out regular tests, BSRIA Test Certificatesare available upon request.

A308 Baroque Terracotta - air leakage at 50 pascals = 3.01 m3 h-1 m-2

A208 Francesco Ash - air leakage at 50 pascals = 3.08 m3 h-1 m-2

LIGHT REFLECTANCE:

Approved Document “M” of the Building Regulations is concerned with access to awide range of buildings, including schools. In this, visual contrast forms a vital part,with current guidance being that Light Reflectance Values (LRV) of contrastingareas should exceed 30 points.

Classico Blanco and Ernestone Buff are the most commonly used of the Acousticblock range for visual contrast. The Ernestone Buff colour exhibits a LRV of 53 fordaylight / fluorescent lighting and a LRV of 56 for tungsten lighting. SportEngland’s advice on the design of sports, community and village halls is that an LRVof around 50 is ideal. A&G have developed the ‘Sporting Green’ colour to enablespecifiers to fully comply with Sport England’s requirements, achieving LRV’s of 48and 53 for Athena and Corinthian finishes respectively.

THERMAL PERFORMANCE

Thermal Conductivity

k value 1.46W/mK

This is the value when used as an internal skin, moisture content will be higher inexternal skin giving a different k value.

Thermal Resistance = d/k215mm AAB = 0.215 = 0.147m2K/W____

1.46

140mm AAB = 0.140 = 0.096m2K/W____1.46

NOTIONAL PERIODS OF FIRE RESISTANCE FOR UNPLASTERED WALLS USING CLASS 1 AGGREGATE BLOCK

Load Bearing Walls Non Load Bearing Walls (HRS) (HRS)

Single Double Leaf Single Double LeafCode Leaf Wall Cavity Wall Leaf Wall Cavity Wall

A308 (Athena) 215mm Hollow 2 4 4 6

C308 (Corinthian) 215mm Hollow 2 4 4 6

A208 (Athena) 140mm Hollow 2 4 3 6

C208 (Corinthian) 140mm Hollow 2 4 3 6

Cavity wall comprising 215mm thick AlphacreteAcoustic blocks® A308, 125mm cavity filled withDriTherm cavity slab, 107mm thick P100 MinervaBasalt blocks

Cavity wall comprising 215mm thick AlphacreteAcoustic blocks® A308, 125mm cavity filled withDriTherm cavity slab, 102.5mm thick BarkleyManor bricks

Figure 4 Cavity wall with blocks

Figure 5 Cavity wall with bricks

TYPICAL U-VALUES0.23W/m2K

TYPICAL U-VALUES0.23W/m2K

FIRE RESISTANCE

Alphacrete Acoustic block® offers excellent fire resistance properties as they aremanufactured from a Class 1 aggregate. This table shows figures for 'notionalperiods of fire resistance' which were obtained from BS476 Fire Test on BuildingMaterials & Structures.

Block WorkP100

Stately BrickBarkley Manor

AlphacreteAcoustic Block®

A308



AlphacreteAcoustic Block®

A308

Alphacrete Acoustic Block® NBSspecifications can be downloadedfrom the A&G website: www.acheson-glover.com

A&G is a member of the NBS Plus Service. A&G is a member of the RIBA and RIAI CPD Providers Network

In-house presentations can beundertaken by prior arrangement(lunch included). Contact us formore information.

A308 A208

A320 A321 A322 A416 A417 A418 A220 A221 A222 A409 A410 A412

PRODUCT DATA: (all dimensions are approximate)

PRODUCT PRODUCT: m2 PER NO. PER COMPRESSIVE WEIGHT WEIGHTSIZE: CODE: PACK PACK STRENGTH PER UNIT PER PACK

440 x 215 x 215mm A308 3.24 32 10 N/mm2 25 kg 0.78 t

440 x 215 x 140mm A208 4.86 48 10 N/mm2 16.8 kg 0.83 t

HALF BLOCKS

220 x 215 x 215mm A309 3.24 64 10 N/mm2 12 kg 0.78 t

220 x 215 x 140mm A209 4.86 96 10 N/mm2 8 kg 0.85 t

FEATURES & BENEFITS: Offers an extensive choice of finishes and coloursthat lets specifiers and contractors create projectswith true visual impact.

Outstanding acoustic performance.

An economical and maintenance free alternativeto other external finishes.

A comprehensive selection of special shapes isavailable for detailing purposes.

Available in the Athena and Corinthian colourranges.

Revolutionary absorbent building block whichprovides simple and cost-effective solutionswhere reverberation causes problems withspeech intelligibility and acoustic performance inconventional constructions.

The real added value of Alphacrete AcousticBlock® is that significant cost savings that can bemade. Once constructed the blocks form adurable and decorative sound absorbing wallwithout the need for plastering, painting or theaddition of separate, sound absorbing wallpanels required to achieve Part ‘E’ compliancewith standard block or brick constructions.

Will reduce the reverberation in the hall therebysignificantly reducing the amplified airbornesound energy.

Additionally, the flutter echoes and standingwaves produced by reflective parallel wallsurfaces will be significantly reduced.

The overall result is reduced distraction fromairborne noise together with improved speechintelligibility.

Subjectively a considerable reduction inreverberant noise levels will be achieved.

The versatile design satisfies acousticrequirements in a multitude of buildingapplications, such as: school gymnasia /classrooms, multi-purpose halls (church halls /concert halls), swimming pools, fitness suites,hotel foyers, atria, commercial and domesticcirculation spaces (stairwells), libraries, cinemasand environmental noise barriers.

Aggregates sourced from our own quarries inFivemiletown, Belcoo and Pomeroy.

Developed and produced exclusively by A&G.

MANUFACTURE: Alphacrete Acoustic block® has a special aggregate mix- together with an altered geometry.

STANDARDS & PERFORMANCE: Alphacrete Acoustic Block® meets every specificationand conforms to BS EN771-3: 2003.Tolerances: D2 to BS EN 771-3:2003

SPORTING GREEN: Acheson & Glover have developed the Sporting Greencolour to help achieve the requirement as prescribed bySport England in the design guidance notes (section 5)February 2011. Acheson & Glover’s Sporting Green colourwill give sufficient contrast against sporting accessories.Further to this, the finish of the block work will give auniform look across all planes adding aesthetic value to theproject.

SOUND ABSORPTION: The absorbent characteristics and sound reductionindices of the blocks were measured in Sound ResearchLaboratories’ UKAS accredited test facility. Full testreports are available on request.

All measurements of sound absorption were performedin accordance with the guidance set down in BS EN ISO354: 2003 - Acoustics - Measurement of soundabsorption in a reverberation room.

FIRE RESISTANCE: Alphacrete Acoustic block® offers excellent fireresistance properties as they are manufactured from aClass 1 aggregate.

Note:

All products are manufactured from natural materials andalthough we strive to provide consistency of colour,variation may occur in the manufacturing process. It is forthis reason that we recommend that products are selectedfrom at least three bales, within each delivery. This willeliminate 'banding'.

As these products contain cement they may suffer fromthe temporary phenomenon of efflorescence. This is in noway detrimental to their performance characteristics andis common in all good quality products with a highcement content. Time should be given for all products toweather in, when they will at this stage look their best.


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TECHNICALINFORMATION (CONTINUED)

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When detailing Alphacrete Acoustic block® panels,the designer should set out masonry units to full orhalf block lengths where possible to avoid unsightlyand unnecessary cutting of units on site.

Co-ordinating dimensions will also ensure that themasonry is properly bonded.

DESIGN &DETAILING

Standard Alphacrete® masonry blocks may beused to achieve alternative finishes as demandedby aesthetics, as well as to tune the soundabsorbing performance.

Helpful Hint

Figure 6 Good DetailingGood Detailing will make the difference:

1 Choose appropriate bond pattern - Stretcher bondis shown in the example.

2 Integrate movement joints with perpends andconceal where possible.

3 Position and size openings to suit block workingmodules. See ‘Coursing Calculation Table’.

4 Construct lintels from pre-formed lintel blocks.

5 It may be necessary to use bond beam units inconjunction with lintel blocks on wider spans.

6 Ensure lintel bearings are whole blocks.

7 A range of sill blocks are available which coursewith blockwork.

For more detailed information on design anddetailing please refer to our Alphacrete® MasonryBlocks brochure.

All colours are made to order (minimum quantity required).See pages 9 and 11 for colour range.

Acoustic Block, Sporting Green


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MASONRY BLOCK CALCULATION TABLES - STANDARD

NO. OF BLOCK CS CS+COURSES

11 2475 2485

12 2700 2710

13 2925 2935

14 3150 3160

15 3375 3385

16 3600 3610

17 3825 3835

18 4050 4060

19 4275 4285

20 4500 4510

NO. OF BLOCK CS CS+COURSES

1 225 235

2 450 460

3 675 685

4 900 910

5 1125 1135

6 1350 1360

7 1575 1585

8 1800 1810

9 2025 2035

10 2250 2260

NO. OF CS- CS CS+BLOCKS

16 7190 7200 7210

161/2 7415 7425 7435

17 7640 7650 7660

171/2 7865 7875 7885

18 8090 8100 8110

181/2 8315 8325 8335

19 8540 8550 8560

191/2 8765 8775 8785

20 8990 9000 9010

201/2 9215 9225 9235

21 9440 9450 9460

211/2 9665 9675 9685

22 9890 9900 9910

221/2 10115 10125 10135

23 10340 10350 10360

231/2 10565 10575 10585

24 10790 10800 10810

241/2 11015 11025 11035

25 11240 11250 11260

251/2 11465 11475 11485

26 11690 11700 11710

261/2 11915 11925 11935

27 12140 12150 12160

271/2 12365 12375 12385

28 12590 12600 12610

281/2 12815 12825 12835

29 13040 13050 13060

291/2 13265 13275 13285

30 13490 13500 13510

301/2 13715 13725 13735

VERTICAL BLOCKWORK-STANDARD [440 x 215mm]

NO. OF CS- CS CS+BLOCKS1/2 215 225 235

1 440 450 460

11/2 665 675 685

2 890 900 910

21/2 1115 1125 1135

3 1340 1350 1360

31/2 1565 1575 1585

4 1790 1800 1810

41/2 2015 2025 2035

5 2240 2250 2260

51/2 2465 2475 2485

6 2690 2700 2710

61/2 2915 2925 2935

7 3140 3150 3160

71/2 3365 3375 3385

8 3590 3600 3610

81/2 3815 3825 3835

9 4040 4050 4060

91/2 4265 4275 4285

10 4490 4500 4510

101/2 4715 4725 4735

11 4940 4950 4960

111/2 5165 5175 5185

12 5390 5400 5410

121/2 5615 5625 5635

13 5840 5850 5860

131/2 6065 6075 6085

14 6290 6300 6310

141/2 6515 6525 6535

15 6740 6750 6760

151/2 6965 6975 6985

HORIZONTAL BLOCKWORK-STANDARD [440 x 215mm]

BLOCK STRETCHER KEYTo assist with co-ordinating sizes.

CS+ CS+ = Actual block length + 2 joints. (ie. Distance used for an opening.)

CS CS = Actual block length + 1 joint.(ie. Distance from an external corner to an internal corner.)

CS- CS- = Actual block length(ie. Distance used for a pier size.)

The tables shown calculate and record the Horizontal and Vertical distance takenup by the number of block used in a course.

Tables shown are for guidance porposesonly. A&G cannot be held responsible forerrors in the final design. All dimensionsshould be checked by the designer.Reference should be made to BS 8000 Part 3‘Code of Practice for Masonry’ which coversallowable building tolerances on site.

EQUIVALENT MORTAR MIXESTable 1: Type of Mortar (proportion by volume)

BS EN 998-2: 2003 MORTAR CEMENT: MASONRY: (PLASTICISED)MORTAR CLASS DESIGNATION LIME:SAND CEMENT:SAND CEMENT:SAND

12 (i) 1 : 0 - 1/4 : 3 - -

6 (ii) 1 : 1/2 : 4 - 41/2 1 : 21/2 - 31/2 1 : 3 - 4

4 (iii) 1 : 1 : 5 - 6 1 : 4 - 5 1 : 5 - 6

2 (iv) 1 : 2 : 8 - 9 1 : 51/2 - 61/2 1 : 7 - 8

For more detailed information on ‘Design & Detailing’ please refer to our Alphacrete® Masonry Blocks brochure.

MORTAR MIXESMortars must be carefully gauged in the proportions given inthe specification, obtained from the architect or our technicalsales department. Too strong a mix may lead to cracking inthe finished work. Too weak a mix will adversely affect boththe strength and durability of the work.

If the sand is dry or saturated the specified volume should beused. If it is damp, it may be necessary to increase the volumeto allow for the effects of bulking. In both instances caremust be taken to ensure correct volumes of cement.

The mortar should be mixed by hand or machine, inaccordance with BS 8000: Part 3: 2001 until it has a uniformcolour throughout.

N.B. Shovel mixing of mortars can cause apparent colourchanges in areas of blockwork.

Mortar should be selected by reference to the BritishStandard Code of Practice for Use of Masonry BS 5628.

A Designation (iii) mortar mix: (1 : 1 : 6 cement:lime:sand) isrecommended for the majority of blockwork above sub-floorlevel constructions.

Choice and consistency of the mortar mix influences the finalappearance of blockwork. Therefore the specification anduse of coloured mortars should be included.

Acoustic Block, Classico Blanco and Minerva Basalt Acoustic Block, Ernestone Buff

Acheson & Glover

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BOND BEAM REINFORCEMENTAlphacrete® Architectural Masonry Block lintels and bondbeams may be used to span openings in wall panels whilstmaintaining the appearance of the block units.

BS 5628 Part. 2 requires that cover to reinforced masonry bedetermined giving consideration to the exposure of theblockwork and also the concrete in-fill strength. Exposureclassification is given in clause 32.

The lintels are designed to support the triangle of blockworkindicated below (Figure 7).

The height of block-work above the lintel must be not lessthan 0.6 x clear span of lintel. No openings should occurwithin the shaded triangle.

For specific design consult your Structural Engineer.

COVER FOR REINFORCEMENTNote that BS 5628: Part 2 requires that cover for durability ismeasured from the in-situ concrete only, whereas cover forfire resistance may include the thickness of the masonry lintel/bond beam units.

SEQUENCE OF LINTEL CONSTRUCTION• Build up blockwork to the course below lintel.

• Provide temporary propping for the lintel units.

• Lay the lintel units with a 10mm wide x 20mm deeptemporary spacer in each joint. Temporary joint spacerscan be any material that provides adequate retention ofthe concrete in-fill and can be removed for pointing e.g.wooden strips or polystyrene.

• Place reinforcement to engineers specification.Plastic spacers will ensure correct coverage.

• Place concrete in the bottom of the lintel units.

• Complete in-situ filling, tamping by hand.

• When in-fill concrete has cured, dismantle temporarypropping and remove joint spacers. Joints should then becarefully pointed to match existing block-work.

MOVEMENT CONTROLBS 5628 Part 3 states that the typical movement joint spacingfor unreinforced concrete masonry panels is 8 to 12m forinternal and 6 to 9m for external panels. Mortar bed jointreinforcement or cast in-situ steel reinforced bond beams canbe used to help control shrinkage or thermal movement inlarger panels. Designers should refer to BS 5628 part 3 or CBAdatasheet 12 for further guidance.

STRUCTURALPERFORMANCE

LINTELS & BOND BEAMSLintels and Bond Beams can be used as astructural element and as a means of movementcontrol. They are constructed using speciallyshaped units, which are filled with concrete andreinforced as per engineers specification.

Other uses of lintels and bond beam courses are as follows:

• below large panel openings;

• at the top of walls to distribute vertical loads;

• as horizontal beams to transfer lateral forcesto columns or piers;

• as single or double course lintels. Figure 8 indicates how a two course lintel is constructed.

Figure 8 Two Course Lintel

When used externally as an environmentalnoise barrier Alphacrete® masonry copingblocks should be used.

Helpful Hint

Figure 7 Load Distribution above Openings

Alphacrete Acoustic

full length lintel unit

Alphacrete Acoustic Block®

Cross Bracing

Temporary Support

Reinforcement with linksat appropriate centres

Bond beam units withwebs knocked out

A320 Lintel Unit

A320 Lintel Unit

Local Bed-Jointreinforcement

A322 Bond Beam Unit

215mmBEARING

215mmBEARING

Min. 0.6 x clear span

Clear span

A322 Bond Beam Unit

Figure 12 Services Integration in Hollow Blocks & Cavity Figure 13 Service Integration - Positioning of Socket Outlets

Figure 14 Service Integration - Concealed in Skirting

The distribution of services and fittings is often not fullyconsidered in the design of the masonry block-work walls,leading to face fixing and an unsightly appearance. This canbe avoided through careful pre-planning and carefulconsideration of the sub-contractors layout drawings as wellas good communication between block-layers andelectricians on site.

Conduits can be run within hollow block-work oralternatively between the 100mm leaves of 215mmstructurally bonded walls.

It is easy for block-layers to locate socket outlets at thecorners of blocks. Again this can look unsightly and it is

possible especially with hollow blocks to centre the outletwithin the block.

Skirting, dado and architrave trunking can be used toprovide service runs, with outlets and switches incorporatedwithin the system. (See figure 14).

Side panels to door assemblies are another useful means ofconcealing and containing wiring and other ancillaryelements such as signage communications and alarms.

Care however is required in the design of the panel to ensurethat it does not impact on the integrity of fire doors. (See figure 15).

SERVICE & FITTINGS

Conduit should be installed in shortlengths to enable the masonry to be‘threaded’ over it.

Helpful Hint


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Fixings can be easily accommodated in Alphacrete® Acousticproducts. Aggregate masonry block provide an ideal mediumfor many types of fixings.

It is generally easier to fix into solid blockwork, the two mostcommon techniques to achieve good connectivity with ties are:

1) fill the hollow portion of the Acoustic blockwork withconcrete thus allowing a heavy duty fixing once theconcrete has cured; or

2) specify a solid block in the same colour and finish from thestandard Alphacrete range (exact colour shade matchcannot be guaranteed). Alternatively light and mediumduty fixings can be used to fix into the solid portion of thehollow Acoustic blockwork.

Figure 11 is a useful indicator of where to locate fixings withina blockwork wall and should be considered at the design anddetailing stage and when fitting out on site.

FIXINGS

For more detailed information on ‘Fixings’ pleaserefer to our Alphacrete® Masonry brochure.

Figure 10 Construction of Single Leaf Wallwith Concrete Column

Figure 11 Position of Fixings

Figure 9 Construction of Cavity Wall with Steel Column

Figure 15 Service Integration - Use of Ducting Panel

Alphacrete Acoustic Blocks®

AlphacreteAcoustic Blocks®




Alphacrete®

Socket outlet locationfor improvedappearance

Dado skirting

Door frame

Ducting panelat door reveal

Door

Where necessary, thebottom layer of blockscan be ‘notched’ toaccommodate cabling.This must be pre-

planned.

In single skinwalls, hollow

units can be usedto accommodatecabling andpipework

Grooving a block end ortop enables you to build

around services

Alphacrete®

Services can run in the cavityof an insulated wall

between the insulant andface of the inner cavity.

NB. Holes for service outletsshould be cut prior to laying


Tie with debonding sleeve

Control joint former this providesmovement control & sufficient restraint

Avoid the top three courses

Never fix next to a wall edge

Fix on centre line 35mm from ends

Wall tie fixed to column at450mm vertical centres

Notched tie plate at 450mmvertical centres

Insulation

Alphacrete®

ISO 14001CERTIFICATIONBS EN ISO 14001 is a comprehensive toolthat provides all industry with a way ofcontrolling environmental impacts. A&Gwere awarded certification for a multi-sitemanagement system (across 8 NImanufacturing sites and 3 quarries) thatdocuments environmental impactsincluding: Energy Waste, Production Waste and Carbon Emissions.

OHSAS 18001CERTIFICATIONOHSAS 18001:2007 is an internationaloccupational health and safetymanagement system that provides aframework to control health and safety risksand improve the health and safety ofemployees.

A&G was awarded certification because ofthe high standards of safety awarenessacross all of its operations.

Design professionals can trust that A&G willalways apply best practice in terms of healthand safety.

THE GREENORGANISATIONA&G have been awarded Bronzemembership status within The GreenOrganisation, one of the country's leadingenvironment groups. Membership isrestricted to companies, councils andcommunities that can demonstrate theeffective measures that have beenintroduced for environmental benefit andA&G was awarded the distinction of Bronzemembership status as a result of its activelyadopting measures that will continue toimprove their environmental performancefor generations to come.

GOOD PRACTICECOMMITMENTS• Water management and recycling.

• Recycling and reuse of aggregates.

• Dust suppression in operation for plantmovement, production processesincluding crushing and screening.

• Developing markets for by-products.

• Adoption of noise suppression andreduction techniques.

• Implementation of waste managementsystems in place across all locations.

• Energy conservation projects.

• Site restoration and aftercare.

• Landscaping and improved visual amenity.

• An “environmental operative” is in placeat all locations. This role encompasses allaspects of the environment. Ensuring thatthe company is adhering to our legislativerequirements.

• A Manager dedicated to environmentalmatters.

CORPORATE SOCIALRESPONSIBILITYA comprehensive social responsibility policyillustrates A&G’s commitment to operatingto the highest standards in every aspect ofits business. We aim to run our businessethically, achieving environmentalstewardship to industry best practice, strivingto manage activities in a safe mannerprotecting the health and safety of everyoneinvolved and encouraging social inclusion inthe communities in which we operate.

SUSTAINABILITYA&G is one of the most innovative andprogressive concrete manufacturingcompanies in the UK and Ireland and hasinvested significantly in modern technology.

Our commitment to positive environmental,social and economic performance is visiblethrough the continuous assessment of ourproducts and their environmental impact.

RESTORATIONWaste material that cannot be recycled backinto the production process is used as an aidto restoration at our sites. It helps to re-landscape and restore parts of our sites nolonger used for production purposes.

ENVIRONMENTALA&G have designated ‘Care of theEnvironment’ as an essential part of thebusiness strategy. We would seek to supportthe Government’s environmental aims byadopting, where possible, Best AvailableTechniques Not Entailing Excessive Cost(BATNEEC).

We will take into account environmentalissues when designing managementsystems, organisational structures andcommunication systems.

CONTROL OF THE WORKINGENVIRONMENTAny industrial process can lead to pollutionof the surrounding environment andatmosphere. In the quarrying and concreteproduct manufacturing industry, ourprocesses involve blasting raw aggregate,crushing, screening, washing and finally thevarious production processes to create ourextensive product ranges. Dust is the mainenvironmental hazard within our plants.

In recognition of this the Company hasdeveloped an Environmental Policy, whichoutlines the Company’s commitment to theenvironment.

• Dedicated environmental operative oneach of our 12 manufacturing sites,responsible for dust control, monitoring siltdischarge and ensuring company meetsrequirements of IPC (Industrial PollutionControl) licence requirements

• Train staff to ensure that the workforceunderstands the environmental impact ofboth the individual and company activities,and environmental policy commitments

• Actively promote the communication ofissues concerning the environment to staff,suppliers and customers.

WASTEMANAGEMENT & DISPOSALOur objective is to eliminate, reduce, reuseand where possible recycle all forms ofcompany waste. By doing this it is possiblefor us to improve our environment,maintain a safe and healthy workplace forour employees, increase operationalefficiencies and achieve savings.

Eliminating the generation of waste at itssource are prime considerations in all plantoperations. The company is committed toidentifying and implementing wastereduction opportunities throughencouragement and involvement of its employees.

‘Green’ Facts for A&GA&G have an internal environmental management system. Our Toome plant usesenvironmentally friendly mixers which re-use washing water for the mixing process.

A&G recognise that the activities of the organisation couldpotentially have a significant impact on the environment. In order to minimise this impact, we take a proactive rather thanreactive stance on environmental issues. In recognition of theseefforts, we have won a number of environmental awards.

THEENVIRONMENT

ENVIRONMENTALAWARDSInternational Green Apple Award -Pomeroy Quarry for the White ClawedCrayfish Habitat (now an arc site).

Environmental Award Scheme - Recycling.

Gold Standard, HSENI - FivemiletownQuarry and Production facilities inrecognition of its commitment to Healthand Safety.

Hard Rock Quarry of the Year Award -Belcoo Quarry at the prestigious Plant &Civil Engineer magazine’s ‘Plant,Construction & Quarry awards.

Environmental Award - Belcoo Plant atNorthern Ireland’s prestigious BelfastTelegraph business awards.

Green Hero Award - Granulated LimePlant in Belcoo and Manufacturing Facilityin Dungannon at National Green AppleEnvironmental Awards.

Green Champion of Ireland - GranulatedLime Plant in Belcoo at National GreenApple Environmental Awards.

Gold Award - Dungannon Plant forSustainable Urban Drainage System.

National Green Champion for NorthernIreland Business - White-clawed Crayfishproject in Pomeroy at the National GreenApple Environmental Awards.

QPA Water Management Award -Dungannon Plant in the Quarry Productsfor Northern Ireland scheme.

QPA Dust Reduction Award - MagherafeltPlant in the Quarry Products for NorthernIreland Environmental Awards Scheme.

Biodiversity Project of the Year - A jointinitiative with Ballinderry RiverEnhancement Association to protect aglobally threatened species - the White-clawed Crayfish, which live in theBallinderry River and Lough NeaghWetlands at the Sustainable IrelandEnergy, Environmental & WasteManagement Awards.

FOR MORE DETAILED INFORMATION PLEASE DOWNLOAD A COPY OF OURENVIRONMENTAL BOOKLET AT: www.acheson-glover.com/downloads


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Contact Us

GREAT BRITAINT: +44 (0)28 8778 [email protected]

IRELAND (NI & ROI)T: +44 (0)28 8952 [email protected]


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