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ACCELERATING WATER-REDUCING CONCRETE ADMIXTURES

Accelerators increase the initial rate of chemical reaction between the cement and the water so that the concrete stiffens, hardens, and develops strength more quickly. They have a negligible effect on consistence, and 28-day strengths are seldom affected. Accelerating admixtures have ...

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RETARDING WATER-REDUCING CONCRETE ADMIXTURE

Retarding water-reducing admixtures are chemicals that slow down the initial reaction between cement and water by reducing the rate of water penetration to the cement and slowing down the growth of the hydration products. The concrete therefore stays workable longer ...

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SHRINKAGE REDUCING CONCRETE ADMIXTURE

Shrinkage-reducing concrete admixture promote expansion of the concrete at about the same volume that normal drying shrinkage is contracting it. The net change in length of the hardened concrete is small enough to prevent shrinkage cracks. The typical materials used ...

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CORROSION INHIBITING ADMIXTURES

Corrosion-inhibiting admixtures are not currently covered by EN 934 but are effective after the concrete has hardened and give a long-term increase in the passivation state of steel reinforcement and other embedded steel in concrete structures. The three most common ...

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VISCOSITY MODIFYING ADMIXTURES IN CONCRETE

VISCOSITY MODIFYING CONCRETE ADMIXTURES Viscosity modifying concrete admixtures (VMAs) is a family of admixtures designed for specific applications. The European Federation for Specialist Construction Chemicals and Concrete Systems cites the following uses:Reduce segregation in highly flowable/self compacting concrete. Reduce washout in ...

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HIGH RANGE WATER REDUCING ADMIXTURE

HIGH RANGE WATER REDUCING ADMIXTURE FOR CONCRETE High range water reducing admixture (ASTM C494 types F and G) decreases the water/cement ratio and provides high-performance, particularly at early ages. Matching the chemical admixture to the cementitious materials, both in type and ...

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Types of Concrete Admixture and their Uses

Concrete admixture is defined as the material other than the aggregate, water and cement added to the concrete. The use of suitable admixture can result in the enhancement the performance of concrete. Types of Concrete Admixture and their Uses Following are the ...

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QUALITY REQUIREMENT OF ADMIXTURE

Quality Requirement of Admixture When the admixtures are said to be compatible with concrete, it should meet the following quality requirement; i) Characteristics of admixture : The data sheet shall give the characteristic details such as type of admixtures, available forms, basic ...

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