In PCC (Plain Cement Concrete) of ratio 1:2:4, the ratios stand for which of the following?

Materials used in PCC

1. Coarse aggregate
2. Fine aggregate
3. Cement
4. Water

Curing of PCC

• Freshly constructed concrete must be covered appropriately to protect it from the elements.
• One to two hours after it has been laid, when the concrete has started to firm, it must be covered with sand, wet gunny bags, or other materials to prevent it from drying out too quickly.
• After the concrete has been laid for 24 hours, the surface must be cured by being submerged in water that is approximately 25mm deep or by being covered with weight-absorbent materials.
• The minimum time for curing is fourteen days.

The following ratio of the concrete mix’s component parts is chosen purely arbitrarily.

Grade	Mix Proportion	Used in
M 5	1: 5: 10	Foundation PCC
M 7.5	1: 4: 8	Foundation and Flooring
M 20	1: 1.5: 3	RCC works
M 15	1: 2: 4	Other PCC works
M 10	1: 3: 6	Flooring

Summary:

In PCC (Plain Cement Concrete) of ratio 1:2:4, the ratios stand for which of the following? (a) Water:Cement: Fine aggregate (b) Fine aggregate: Coarse aggregate: Cement (c) Cement: Fine aggregate: Coarse aggregate (d) Cement: Coarse aggregate: Fine aggregate

The ratios in PCC (Plain Cement Concrete) of the proportions 1: 2: 4 stand for cement: Coarse versus fine aggregate.