concrete volume (70% to 85% by mass) and strongly influence the concrete''s freshly mixed and hardened properties, mixture proportions, and economy. Fine aggregates (Fig. 51) generally consist of natural sand or crushed stone with most particles smaller than 5 mm ( in.). Coarse aggregates (Fig. 52) consist of one or a comCHAPTER 5 Aggregates for Concrete bination of gravels or crushed ...
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Corrosion of embedded metals in concrete can be greatly reduced by placing crackfree concrete with low permeability and sufficient concrete cover. Lowpermeability concrete can be attained by decreasing the water to cementitious materials ratio of the concrete and the use of pozzolans and slag. Pozzolans and slag also increase the concrete resistivity thus reducing the corrosion rate even ...
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· In general, it is a bad conductor of heat and is a good fireresistant material. Concrete does not have melting point but there is loss of strength after certain degree of temperature. There is no loss of strength in concrete up to 250 0 C. The actual degree of fireresistance of concrete depends upon the nature of aggregates used and its density. In case of RCC and prestressed construction ...
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· A team from the Universitat Politècnica de València (UPV) and the Politecnico di Milano has designed new ultraresistant and selfrepairing concrete materials. They have 30% more durability ...
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· A concrete using an air entrained cement (A) Has strength less than 10% to 15% (B) Has more resistance to weathering (C) Is more plastic and workable (D) .
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