Anti-Washout Admixture for Underwater Concreting -Types, Advantages and Uses

Anti-washout admixture of concrete for underwater concreting is produced as a viscosity modifying admixture to enhance the rheological properties of cement paste. It mainly composed of microbial polysaccharides for example gum or polysaccharide derivatives for instance hydroxyethyl cellulose and hydroxypropyl ...

Ground Granulated Blast Furnace Slag in Concrete & its Advantages

The ground granulated blast furnace slag (GGBFS) is a by-product of iron manufacturing which when added to concrete improves its properties such as workability, strength and durability. This material is obtained by the heating of iron ore, limestone and coke at ...

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 ...

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 ...

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 ...

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 ...

PROPERTIES AND USES OF CONCRETE ADMIXTURES

What are Concrete Admixtures? Ingredients other than cement, water, and aggregates that impart a specific quality to either plastic (fresh) mix or the hardened concrete (ASTM C496) is ...