Materials used for R.C.C. Work

1. Cement 
2. Aggregate
3. Steel
4. Water

• The material which is passed through BIS test sieve no 480 is termed as fine aggregate . Usually , the natural river sand is used as a fine aggregate.
• The material which is retained on BIS test sieve no. 480 is termed as a coarse aggregate . The broken stone is generally used as a coarse aggregate .
• For thin slabs and walls, the maximum size of coarse aggregate should be limited to one-third the thickness of concrete section 
• It may be notes that sometimes ingredients other then above are added in concrete to give it certain improve qualities or for changing different physical propertis in its fresh and hardened stages. These ingredients or substances are known as the admixtures . The additional of an admixture may improve the concrete with respect to its strength , hardness , workability , water resisting power etc.