plan building materials presentation admixtures

Hujaj Ali Khan | au.linkedin.com/in/hujajalikhan/

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Plan BuildingPresentation On Material +


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Presentation Talk

Material & uses

Durability

Compatibility

Fixing Methods ( Mixing )

Proprietary Methods

Quality Checking Methods

Transportation (Safety – Storage

Fire RatingHandling – SafeEmbodied EnergyCosting $$$

Deemed to satisfyAlternative Materials

Future of AdmixturesConclusion


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Building Materials

CementPlaster glass

Masonry units

Paints Coatings

Structural Steel

Ceramics

FramingMortars

Plasterboard

Timber

Concrete

Glass

Roofing

Flooring


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Admixtures

Material& usesDurabilityCompatibilityFixing MethodsProprietary MethodsQuality Checking

MethodsTransportation

(Safety – Storage)

Fire RatingHandling – SafeEmbodied EnergyCosting $$$Deemed to satisfyAlternative

MaterialsFuture of

AdmixturesConclusion


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Admixtures

The Australian Standard AS 1478 Chemical admixtures for concrete, mortar and grout defines

“an admixture as a material, other than water, aggregate and cementitious materials, used as an ingredient of concrete, and added to the batch in controlled amounts immediately before or during its mixing to produce some desired modification to the properties of the concrete”

Reduce the cost of concrete construction

Achieve certain properties in concrete more effectively than by other means

Quality of concrete during the stages of mixing,

transporting, placing, and curing in adverse weather conditions

Emergencies during concreting operations

Ingredients in concrete other than Portland cement, water, and aggregates added to the mixture immediately before or during mixing


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Material & uses- Functions

Air-entraining admixtures

Water-reducing admixtures

Plasticizers

Accelerating admixtures

Retarding admixtures

Hydration-control admixtures


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Material& uses- Functions

Corrosion inhibitors

Shrinkage reducers

Alkali-silica reactivity inhibitors

Colouring admixtures

Miscellaneous admixtures (workability, bonding, damp proofing, permeability reducing, grouting, gas-forming, and pumping admixtures)


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Influence Client/Design/Builder/Supply chainMaterial Selection


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Stabilize microscopic air bubbles in concrete. Air-entrainment will dramatically improve the durability of concrete exposed to cycles of freezing and thawing. Entrained air greatly improves concrete's resistance to surface scaling caused by chemical de-icers.


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Scaled concrete surface resulting from lack of air entrainment, use of deicers, and poor finishing and curing practices

The primary ingredients used in air-entraining admixtures are salts of wood resin (Vinsol resin), synthetic detergents, salts of petroleum acids, etc.


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Water-Reducing Admixtures

The effectiveness of water reducers on concrete is a function of their chemical composition, concrete temperature, cement composition and fineness, cement content, and the presence of other admixtures


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Water-Reducing Admixtures

Reduce the quantity of mixing water required to produce concrete of a certain slump, reduce water-cementing materials ratio, reduce cement content, or increase slump.

Typical water reducers reduce the water content by approximately 5% to 10%.

Materials: Lignosulfonates.Carbohydrates.Hydroxylated carboxylic acids


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Super plasticizers (High-Range Water Reducers)

These admixtures are added to concrete with a low-to-normal slump and water-cementing materials ratio to make high-slump flowing concrete.

Flowing concrete is a highly fluid but workable concrete that can be placed with little or no vibration or compaction while still remaining essentially free of excessive bleeding or segregation.


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Applications - flowing concrete • Thin-section

placements• Areas of closely

spaced and congested reinforcing steel

• Pumped concrete to reduce pump pressure, thereby increasing lift and distance capacity,

• Areas where conventional consolidation methods are impractical or can not be used

• Reducing handling costs.


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Low water to cement ratio concrete with low chloride permeability--- easily made with high-range water reducers- is ideal for bridge decks

Plasticized, flowing concrete is easily placed in thin sections

Materials

Sulfonated melamine formaldehyde condensates.Sulfonated naphthalene formaldehyde condensate.Lignosulfonates.Polycarboxylates.


Bleed less

Drying shrinkage

Effectiveness


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Retarding Admixtures

MaterialsRetard the rate of setting of concrete at high temperatures of fresh concrete (30°C or more).Counteracting the effect is to reduce the temperature of the concrete by cooling the mixing water or the aggregates. Retarders do not decrease the initial temperature of concrete. The bleeding rate and capacity of plastic concrete is increased with retarders.

Lignin

Borax

Sugars

Tartaric acid and salts


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Retarding Admixtures Uses

Offset the accelerating effect of hot weather on the setting of concrete

Delay the initial set of concrete when difficult or unusual conditions of placement occur,

Delay the set for special finishing processes such as an exposed aggregate surface.

Accelerate strength development of concrete at an early age.

Reduction in strength at early ages (one to three days) accompanies the use of retarders.

Effects of these materials on the other properties of concrete, such as shrinkage, may not be predictable.

Acceptance tests of retarders should be made with actual job materials under anticipated job conditions.


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Retarding Admixtures Uses

Materials Calcium chlorideTriethanolamine

Calcium formateCalcium nitrate

Calcium nitrite


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Admixtures-Australian StandardsAS 1478 •Chemical admixtures for concrete, mortar and

grout

AS 1478.1•Admixtures for concrete

AS 2072 • Methods for the sampling of expanding admixtures for concrete, mortar and grout

AS 2073 •Methods for the testing of expanding admixtures for concrete, mortar and grout.


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Durability

Relationship between durability &bubble spacing factor of entrained air Effect of entrained air on durability Water reduction reduces permeability, increases durability


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Compatibility

The satisfactory performance of expandingadmixtures will depend to a significant extent ontheir being distributed uniformly throughout the mix.When more than one admixture is used, thecompatibility of the combination is important. If anon-compatible combination is used (such as aniron-based admixture and calcium chloride asaccelerator) the properties of the concrete may beadversely affected.

The compatibility of admixtures used in combination should be checked.


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Mixing

The time in the mixing cycle at which the admixture is introduced into the concrete mix will also affect the level of retardation obtained. Delayed addition of the admixture, i.e. after the cement has been mixed with water, produces longer setting times than when the admixture is added with the mixing water.

ConsiderationsType and duration of mixing.Rate of mixingAdequate re-mixingMixing temperature and time


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Proprietary Methods

In proprietary products, this is normally compensated for by the addition of an appropriate amount of an accelerator such as triethanolamine. By adjustment of the amount of accelerator incorporated in the admixture, a range of setting times may beobtained. Indeed, products can be formulated to compensate for the changes in ambient temperature between summer and winter.


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Fire Rating OPC -Future of AdmixturesSource : The International Institute for Science,Technology and Education (IISTE)

i) That the Carbide Waste (CW) performs satisfactorily as concrete fire resistance if the proportion of the CW is kept at 10 % replacement.ii) The compressive strength of CW concrete compares favourably with that of control in ordinary water at 28 days.iii) Soundness of cement increase as

CW content increase.iv) CW has increase influence on both initial and final setting time of OPC concrete, the setting times increase with increase in % of CW.v) Replacing OPC with 10% of CW would increase the fire resistance of concrete by 14% to that of OPC concrete at 500oC.

Effect of Admixture on Fire Resistance of Ordinary Portland Cement Concrete


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Transportation & Safety

Transportation TimeAvoid limiting the type of admixtures that can be used unless there is a specific reason (eg. Chloride based admixtures for corrosion).Consider specifying or allowing the use of admixtures which do not have a specific ASTM designation with appropriate documentation indicating beneficial use to concrete properties.These include colors, viscosity modifying admixtures, hydration stabilizing admixtures, pumping aids, anti-freeze admixtures, etc


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Environmental SafetyCEMENT ADMIXTURES ASSOCIATION http://www.admixtures.org.uk/downloads/AES%2012%20Admixture,%20EcoPoints%20&%20the%20Green%20Guide.pdf

Admixtures:

Although sustainability considerations are a current focus for admixture use, the historic benefits should not be ignored as they contribute to the durability of concrete which in itself is a key sustainability benefit for concrete over other construction materials. Admixtures can give economic benefits in both production and placing, optimising mix design, reducing the need for heat curing in precast and allowing modern placing methods to be employed which reduce noise and vibration as well as faster construction.

http://www.admixtures.org.uk/downloads/AES%2012%20Admixture,%20EcoPoints%20&%20the%20Green%20Guide.pdf

http://www.admixtures.org.uk/downloads/AES%2012%20Admixture,%20EcoPoints%20&%20the%20Green%20Guide.pdf


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Quality Checking MethodsQA/QC & SafetyQuality Assurance / Quality Control by http://premcorm.com

Sets of Sieves Aggregates Sample in Tray Weighing Scale or Balance Sieve Analysis (Grading) for Aggregates Moisture Content Determination

Thermostatic Drying Oven

Sampling of Freshly Mixed Concrete from the Transit Mixer

Slump Cone Scoop Tamping Rod Trowel Meter or Ruler Slump Cone Base (Sampling Tray)

Casting of Concrete Cylinders Specimens

http://premcorm.com/


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Costing $$$http://www.bunnings.com.au/search/products?q=admixtures&redirectFrom=Anyhttp://www.bunnings.com.au/search/products?q=admixtures&redirectFrom=Any&facets=CategoryIdPath%3D2a021706-07d5-4648-bf26-2ea8fea049df%20%3E%20bfa7e4dc-1acd-4499-819c-12c0c7dea779%20%3E%20aeffcfe3-92c3-4f35-b206-64ecc6243255

Crommelin 1L High Performance Bonding Agent cement 20$General purpose 30-40

Membrane 140

http://www.bunnings.com.au/search/products?q=admixtures&redirectFrom=Any

http://www.bunnings.com.au/search/products?q=admixtures&redirectFrom=Any

http://www.bunnings.com.au/search/products?q=admixtures&redirectFrom=Any&facets=CategoryIdPath=2a021706-07d5-4648-bf26-2ea8fea049df%20%3E%20bfa7e4dc-1acd-4499-819c-12c0c7dea779%20%3E%20aeffcfe3-92c3-4f35-b206-64ecc6243255



http://www.bunnings.com.au/crommelin-1l-high-performance-bonding-agent_p0960287






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• http://www.supplychainmagazine.fr/TOUTE-INFO/ETUDES/SCBarometer2012-Capgemini.pdf

http://www.supplychainmagazine.fr/TOUTE-INFO/ETUDES/SCBarometer2012-Capgemini.pdf