BCC ADMIXTURE

The freshly-mixed and hardened properties of concrete may be changed by adding liquid (chemical) or mineral admixtures to the concrete, during batching. Admixtures are commonly used to:-

(1) Intentionally entrain air.

(2) Reduce water demand.

(3) Increase workability.

(4) Adjust setting time or hardening.

(5) Adjust other concrete properties, such as strength.

Common chemical admixtures include water reducers, set retarders and accelerators, air entraining, and super-plasticizers. Common finely-divided mineral admixtures are usually classified as either cementitious materials (i.e. ground-granulated blast furnace slag and lime), or pozzolans (i.e. fly ash and silica fume).

Admixtures that affect the workability of a concrete mixture will also affect the slump, which is a test of the consistency of the mix. The slump of a mix with the same aggregate, cement and water can vary significantly by adding an admixture such as a high-range water-reducing admixture (super-plasticizer), which will increase the strength and provide greatly increased workability with the addition of excessive amounts of water. The admixture does not, however, reduce the quality of the material.

Air bubbles are entrained in concrete using an air-entraining admixture. The tiny microscopic bubbles provide free space within the paste to relieve hydraulic pressure when concrete freezes. Without the bubbles, the paste may crack when it freezes because water expands 9% in volume when it turns to ice. With entrained air, there is free space within the concrete to relieve pressure in the paste during freezing.

changed by adding liquid (chemical) or mineral admixtures to the concrete, during batching. Admixtures are commonly used to:-

(1) Intentionally entrain air.

(2) Reduce water demand.

(3) Increase workability.

(4) Adjust setting time or hardening.

(5) Adjust other concrete properties, such as strength.

Common chemical admixtures include water reducers, set retarders and accelerators, air entraining, and super-plasticizers. Common finely-divided mineral admixtures are usually classified as either cementitious materials (i.e. ground-granulated blast furnace slag and lime), or pozzolans (i.e. fly ash and silica fume).

Admixtures that affect the workability of a concrete mixture will also affect the slump, which is a test of the consistency of the mix. The slump of a mix with the same aggregate, cement and water can vary significantly by adding an admixture such as a high-range water-reducing admixture (super-plasticizer), which will increase the strength and provide greatly increased workability with the addition of excessive amounts of water. The admixture does not, however, reduce the quality of the material.

BCC AEA 192
BCC FLUID 235
BCC POWER 150
BCC PLAST 300
BCC POWER 1100
BCC POWER 1000
BCC WATERPROOF 625
BCC RETARDER 310
BCC POWDER 2000
BCC ACCELERATOR 727
BCC ACCELERATOR 510
BCC SUPER PLAST 437
BCC SUPER PLAST 470
BCC SUPER PLAST 675
BCC AARR (Alkali-Aggregate Reaction Resistant)
BCC NAPTHALENE


BENEFITS

  • To improve workability of fresh concrete.
  • To improve durability by entrainment of air.
  • To reduce the water required.
  • To accelerate setting & hardening & thus to produce high early strength.
  • To aid curing.
  • To impart water repellent / water proofing property.
  • To cause dispersion of the cement particles when mixed with water.
  • To retard setting.
  • To improve wear resistance (hardness).
  • To offset / reduce shrinkage during setting & hardening.
  • To cause expansion of concrete and automatic pre-stressing of steel.
  • To aerate mortar / concrete to produce a light-weight product.
  • To impart color to concrete.
  • To offset or reduce some chemical reaction.
  • To reduce bleeding.
  • To reduce the evolution of heat.