concrete ( water & admixture )

-Function

1. Chemical reaction with cement and thus causing it to set and harden
2. Lubricate the aggregates in concrete
3. Mixing , placing and compacting concrete
4. Washing aggregates
5. Curing

Why use clean water ?

• Impurities in water ( large quantity of suspended solids , excessive amount of dissolved solids , or salts , or appreciable amount of organic materials ) will :

1. Affect setting
2. Affect strength
3. Cause staining on concrete surface
4. cause corrosion of reinforcement
5. Drying shrinkage
6. Efflorescene
7. Acidic water affect setting and hardening of concrete ; alkaline water = quick setting and low strength