Building Materials, Third Edition by S.K. Duggal

By S.K. Duggal

This ebook highlights: mechanical and actual houses of assorted fabrics with emphasis on energy and sturdiness; impact of varied components on those homes; motives of defects, their prevention and treatments; and, trying out systems of fabrics. This variation contains: fabrics adjustments in chapters facing cement, concrete, lime and so on; up-to-date trying out strategies; a number of revision of information and substitutions; and, shrewdpermanent and composite fabrics as a separate bankruptcy. The ebook might function a via textual content for undergraduate scholars of civil engineering, structure and building know-how. training engineers, architects and contractors could additionally locate it a helpful reference resource.

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The plasticity and strength of the clay are improved by exposing the clay to weather. Blending: The earth is then mixed with sandy-earth and calcareous-earth in suitable proportions to modify the composition of soil. Moderate amount of water is mixed so as to obtain the right consistency for moulding. The mass is then mixed uniformly with spades. Addition of water to the soil at the dumps is necessary for the easy mixing and workability, but the addition of water should be controlled in such a way that it may not create a problem in moulding and drying.

Types Type A — Blocks with both faces keyed for plastering or rendering. Type B — Blocks with both faces smooth for use without plastering or rendering on either side. Type C — Blocks with one face keyed and one face smooth. 5 N/mm2. Strength of individual block should not fall below the average value by more than 20 per cent. Water absorption should not be more than 20 per cent. 18 BURNT CLAY JALLIS (IS: 7556) These are normally used for providing a screen on verandah and construction of parapet or boundary walls.

Addition of water to the soil at the dumps is necessary for the easy mixing and workability, but the addition of water should be controlled in such a way that it may not create a problem in moulding and drying. Excessive moisture content may effect the size and shape of the finished brick. Structural Clay Products 19 Tempering: Tempering consists of kneading the earth with feet so as to make the mass stiff and plastics (by plasticity, we mean the property which wet clay has of being permanently deformed without cracking).

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