Definition of Lean Concrete
Lean concrete is called if the cement content used in concrete is less than about 10% of the total contents.
- It is widely used in floors and foundations.
- P.C.C.(1:4:8) and P.C.C.(1:6:12) are the examples of lean concrete.
- In PCC (1:4:8) cement content is almost 7% while it is 5% in P.C.C.(1:6:12)
If the cement content is more than 10 and less than 15%, the concrete is called normal concrete.
- For example P.C.C.(1:2:4) is normal concrete.
- Cement content in this concrete P.C.C.(1:2:4) is almost 14%.
- Normal concrete is used in D.P.C. , R.C.C. and floor finishes.
If the cement content in concrete is more than about 15%, then it is known as rich concrete.
- For example P.C.C.(1:1.5:3) is rich concrete.
- Cement content in P.C.C.(1:1.5:3) is almost 18%.
- It is used for R.C.C. when smaller structural members are used to support heavier loads for architectural reasons.