The usual proportion of ingredients in reinforced cement concrete is -

Portland cement (1 part), clean sand (2 to 4 parts) and coarse aggregate (1 to 2 parts)

Portland cement (1 part), clean sand (1 to 2 parts) and coarse aggregate (2 to 4 parts)

Portland cement (1 part), clean sand and coarse aggregate (2 to 4 parts)

any one of above