The process of keeping concrete moist for a certain period after its finishing, is known as A. Finishing of concrete B. Curing of concrete C. Placing of concrete D. Compaction of concrete

The correct answer is B. Curing of concrete.

Curing is the process of keeping concrete moist for a certain period after its finishing, to allow the cement to hydrate and develop its strength. The curing process can be done by keeping the concrete wet, using a curing compound, or by using steam curing.

Finishing is the process of shaping and smoothing the surface of concrete. It can be done by hand or with machines.

Placing is the process of placing concrete in the formwork. It is important to place the concrete carefully to avoid segregation and honeycombing.

Compaction is the process of compacting concrete to remove air voids and improve its strength. It can be done by hand or with machines.