main changes to draft sr 21:2013 hardcore material … · main changes to draft sr 21:2013 hardcore...

Main changes to draft SR 21:2013

Hardcore material for use under concrete floors

Engineers Ireland 5th November 2013

Sarah Neary BE MBA CEng MIEI Senior Adviser Building Standards Environment, Community and Local Government

Presentation overview

• Report of the Pyrite Panel

• What is in SR 21 ?

• Specification for “hardcore” for use under concrete floors –

SR 21 - Annex E .

Report of the Pyrite Panel

Report of the Pyrite Panel

• Report of the Pyrite Panel - June 2012

• Summary – Panel investigated the nature, scale and reason

for the problem

– Panel examined the roles and responsibilities of stakeholders

– Panel made recommendations for solving the existing problem and for preventing similar problems arising in the future

• Recommendations for standards – Rec1: Testing Protocol

– Rec3: Method statement for remediation works

– Rec15: (a)Review of SR 21:2004+A1:2007

(b)Standalone specification for hardcore

Response to the Report of the Pyrite Panel

Legacy issues

Irish Standard I.S. 398

Irish Standard I.S. 398 1: 2013

Reactive pyrite in sub-floor hardcore material – Part 1: Testing and categorisation protocol


Reactive pyrite in sub-floor hardcore material

– Part 2: Methodology for remediation works

Use of documents in Remediation works

Legacy issues







Testing

Remedial works methodology


Legacy issues







Future prevention

Standard Recommendation S.R.21 201X

S.R. 21: Guidance on the use I.S. EN 13242:2013 – Aggregates for unbound and hydraulically bound materials for use in civil engineering work and road construction

Annex E: Recommendations for the specification of unbound granular fill (hardcore) for use under concrete floors and footpaths

Irish Standard I.S. XXX 201X

Code of Practice for the procurement and use of unbound granular fill hardcore for use under concrete floors

Testing



Legacy issues







Future prevention



Annex E: Recommendations for the specification of unbound granular fill (hardcore) for use under concrete floors and footpaths



Testing

Specification for hardcore


Procuring & using hardcore

Status of documents - November 2013

Legacy issues







Future prevention





What is in SR 21?

Evolution of SR 21

• SR 21: 2004 – Guidance on the use of I.S. EN 13242:2002 –

Aggregates for unbound materials for use in civil engineering work and road construction

• SR 21:2004+A1:2007 – Guidance on the use of I.S. EN 13242:2002 –

Aggregates for unbound materials for use in civil engineering work and road construction (incorporating amendment 1: 2007)

• Annex E: Example specification for unbound granular fill for use under concrete floors and footpaths

• Section 3.4.2

• SR21: 201X – Guidance on the use of I.S. EN 13242:2013 –

Aggregates for unbound materials for use in civil engineering work and road construction

– What’s new?

What’s new?

(SR 21 - Public Enquiry document) • SR 21: 201X - Guidance on the use of I.S. EN 13242:2013 – Aggregates for unbound materials for

use in civil engineering work and road construction

What’s new?

• Complete revision of text due to change from I.S. EN 13242:2002 to I.S. EN 13242:2013

– Recycled aggregates

– Manufactured aggreates

– Factory production control elsewhere (I.S. EN 16236:2013 )

• Guidance on the change from CPD to CPR

• Guidance on the use of I.S. EN 16236:2013 Evaluation of conformity of aggregates - initial type testing and factory production control

• Provides guidance on specifying aggregates for use in unbound and hydraulically bound materials

• Revision of Annex E in line with the I.S. EN 13242:2013 and the recommendations of the pyrite panel

– Recommendations for the specification of unbound granular fill (hardcore) material for use under concrete floors and footpaths

» Material properties

» Procedures for production

Specification for “hardcore”

SR 21 - Annex E

Annex E –Recommendation for the specification of unbound

granular fill (hardcore ) for use under concrete floors and footpaths

• Material properties

1. Geometric properties

2. Physical properties

3. Chemical properties

4. Geological & petrographic properties

5. Aggregate type

• Procedures for production

1. Evaluation of conformity

2. Sampling and testing plan

3. Traceability

4. Certification

Annex E: Material properties

1. Geometric properties – grading

• Special aggregate grating because of particular use eg crushed rock 0/31.5DG80

• Changed from single size (2007) to all-in aggregate – ease of compaction



• Los Angeles Coefficient (LA)

– An indicator of resistance to fragmentation

– Limit set at < or = 30 (previously LA40 improved strength)

• Water Absorption (WA)

– An indicator of potential durability

– Limit set at < or = 2% for gravels and non-limestone rock

– Irish Concrete Federation – to carry out survey

– Limit for limestone may be reduced subject to survey by Irish Concrete Federation

• Magnesium sulfate soundness (MgSO4)

– An indicator of potential durability

– This test must be done (previously only when WA exceeded 2%)

– Limit set at < or = 25%



• Acid soluble sulfate (AS)

– Limit maintained at < or = 0.2%

• Total sulfur (S)

– Limits revised as follows:

• S < 0.3%

• S between 0.3% and 1% (inclusive) - Petrographic Assessment required

• S > 1% - Not suitable



• Geological description of the aggregate (end product)

– Professional geologist - to identify deleterious rock types (if present)on the basis of mineralogical composition. All information on lithologies and mineral recorded

– Mudrock most likely to swell and to contain framboidal pyrite

Mudrock content limited < 10%

• Petrographic assessment of the aggregate (end product)

– Only carried out when total sulfur content is between 0.3% and 1%

– Professional geologist/ petrographer

– Thin Section petrographic assessment & (if necessary) X-Ray Diffraction

– Primarily to establish the form & distribution of pyrite present (if any)

– Predominantly reactive pyrite means it is unsuitable as “hardcore” for use under concrete floors

– Professional geologist to make a declaration taking all parameters into account to deem it suitable.

– If Pyrrhotite is present a limit of < or = 0.4% S


5. Aggregate type

• No recycled aggregates

• No manufactured aggregates

• Only natural aggregates should be used for “hardcore”








5. Aggregate type




3. Traceability

4. Certification

Annex E – Procedures for production

1. Evaluation of conformity (I.S. EN 16236:2012)

•Assessment and verification of constancy of performance (AVoCP) System 2+ (Previously System 4)

– Initial Type Testing (ITT)* • A new source of aggregates

• Major change in raw materials

– Factory Production Control (FPC)* • Organisation, control procedures, inspections &

tests, records, control of non-conformities, handling, storage & conditioning of production areas, transport and packaging, training.

• Initial inspection of quarry and FPC*

• Continuous surveillance, assessment & approval*

• Regular testing - to a prescribed test plan*

*

*



Note 1: Test frequencies may be revised based on the advise of the professional geologist. Note 2: Test frequencies are generally related to periods of production. A period of production is defined as a full week, month, or year of production working days.(I.S.EN 16326 6.4.3)


• Geological assessment of the quarry deposit

– Professional geologist – initially, annually and at a major change of lithology (or as per Prof Geo)

– Initial assessment – to identify & map proportions of lithologies, document problematical

lithologies, evidence of reactive pyrite, reference any limitations on use.

– I.S. EN 16236 (6.3.4 – Knowledge of the raw material)


3. Traceability

• The Declaration of Performance (DoP) should include a statement declaring Annex E material as a special aggregate required for a particular end use i.e. unbound granular fill (hardcore) for use under concrete floors and footpaths.

• The relevant delivery docket should state that the material complies with Annex E of SR 21. The following description should be used on dockets:

"GRANULAR FILL SR21:2013 ANNEX E"


4. Certification

• Materials produced in compliance with I.S. EN 13242 and SR 21 Annex E should only be supplied by producers who have achieved third party certification in accordance with assessment and verification of constancy of performance (AVoCP) system 2+.

– CE Marking

– Declaration of performance








5. Aggregate type




3. Traceability

4. Certification

What’s next?

• SR 21 - Public enquiry closed on 1/11/2013

• Committee to review comments

• Final version of SR 21 to be published asap

• Irish Standard I.S. XXX 201X - Code of Practice for the procurement and use of unbound granular fill hardcore for use under concrete floors

– In progress

– Post production activities

– Procurement, haulage, delivery, receipt,

– storage and handling, placing,

– record management etc.

Thank you

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