Calculation the quantities of cement, sand and aggregate are most important in estimating work and costing of the building . Aggregate shall be of invert materials and should be clean, dense, hard, sound, durable, non absorbent and capable of developing good bond with mortar.

Coarse Aggregate

Coarse aggregate shall be of hard broken stone of granite or similar stone, free from dust, dirt and other foreign matters. The stone ballast shall be of 20 mm size and down and all should be retain in a 5 mm square mesh. Also well grade such that the voids do not exceed 42 percent.The gauge of the stone ballast shall be as specify depending on the thickness of concrete and nature of work. For building work 20 mm gauge and for road work and mass work 40 to 60 mm gauge may be use.

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Fine aggregate

Fine aggregate shall be of course sand consisting of hard, sharp and angular grains. It also pass through screen of 5 mm square mesh. Sand shall be of standard specifications clean and free from dust, dirt, and organic matters. Sea sand shall not be use.

Cement

Cement shall be fresh portland cement of standard I.S.I. specifications. Also have the requiring tensile and compressive stresses and fineness.

Water

Water shall be clean and free from alkaline and acid matters. It suitable for drinking purposes.

Proportion

The proportion of concrete shall be 1 : 2 : 4 as cement : sand : stone : ballast by volume unless otherwise specifying. Minimum compressive strength of concrete of 1 : 2 : 4 proportion shall be 140 kg per sq cm on 7 days.

Slump

Regular slump test should be carrying out to control the addition of water. It maintain the requiring consistency. A slump of 7.5 cm to 10 cm may be allow for building work, and 4 cm to 3 cm may allow for road work.

Calculate the quantities of brick work and cement, sand and aggregates in slab

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