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WATERPROOFING ADMIXTURES FOR CONCRETE

Waterproofing admixture for concrete is also called as water resisting admixture and permeability reducing admixture. These admixtures prevent the passage of water through hardened concrete under a pressure head. Water is an essential part of concrete construction from the mixing of ...

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CONCRETE ADMIXTURES – SELECTION AND APPLICATIONS

Concrete admixtures are used to enhance the properties of concrete for applications in concrete works with special requirements. Concrete admixtures are used to modify the properties of concrete to achieve desired workability in case of low water cement ratio, and to ...

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FACTORS AFFECTING CONCRETE ADMIXTURES PERFORMANCE

The various factors which affect the performance of concrete admixtures are: 1. Type of super-plasticizer: The admixture will be more effective if molecular weight of the super-plasticizer is high. 2. Dosage: The quantity of admixture should be optimum. Excess of admixture may cause segregation ...

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ADVERSE EFFECT OF CONCRETE ADMIXTURE

Adverse effects due to improper application : Admixtures are used extensively to produce high workable, high strength high performance and highly durable concrete with minimum cost. However, these admixtures are not used judiciously and with the poor knowledge of admixture among ...

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STANDARD CODES FOR CONCRETE ADMIXTURES

Standard Codes for concrete admixtures: Admixtures used should conform to the following relevant  standard codes. In reinforced concrete, the chloride ion of any admixture used should not exceed 2% by weight  of the admixture as determined in accordance with IS:6925 ...

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FUNCTIONS OF CONCRETE ADMIXTURES

Concrete admixtures are added to change the properties of concrete to make it function as required. Admixtures are used to modify properties of both fresh and hardened concrete as discussed below: Functions of admixtures to modify fresh concrete properties: a) To increase ...

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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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