Civil Engineering - Concrete Technology - Discussion

Where cement concrete 1:2; 4 ratio is used it means 1 part cement 2 parts of fine aggregate or coarse sand and 4 parts of coarse aggregate. This ratio cement concrete has good strength and is recommended for the following type of buildings and works:-

- Used in footings of columns and raft foundation, used in beams, slabs, columns, stairs and walls of ordinary, single story and temporary buildings and used in retaining walls, pavements, floors and bedplates etc.

- Where cement concrete 1:1:5:3 ratio is used it means 1 part cement 1.5 parts of fine aggregate or coarse sand and 3 parts of coarse aggregates. This ratio cement concrete has very good strength and is recommended for the following type of buildings and works:-

- Important RCC structures, piles, arches, impermeable construction against water heads. This ratio of cement concrete is safe against earth quake.

M20 is right one.

1:1.5:3, because is 456-2000 specifies min grade of concrete for rcc works is M20.

M20 concrete is used having proportion 1:1.5:3.

Please, check m20 proportion.

Yes, it is revised from m15 to m20, therefore ans is m20 i.e 1:1.5:3.

As per IS code, blow than M20 (1:1. 5:3) grades not used in Rcc work.

Yes, 1:1.5:3 is right answer.

Correct answer is 1:1/2:3 according to reference book by Khurmi.

Anyone explain the answer.