" 1."quad " Why are concrete hardened है? "

The soap can be hardened by

Concrete is a -

Houses made of concrete are celled

Plantlets produced in the laboratory need to be hardened before transplanting them in the field. Explain why they need to be hardened and how it is carried out.

Cement, sand, and gravel are mixed in the ratio 1:2:3 , respectively, to make concrete. What percentages of cement, sand, and gravel are used in concrete?

What is hardening?

Concrete is a mixture of

Define seed hardening.