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USE OF CRUSHED SAND IN CONCRETE Introduction : As per IS383 and MoRT&H specifications, the crushed sand is defined as fine aggregate produced from crushing hard stone. In construction terminology, it is called as crusher dust produced from secondary crushing from horizontal or vertical shaft impactors. These are controlled and have material passing less than 0.150mm (150microns IS sieve), not more than 20% and material passing 0.075mm (75micorns IS sieve) not more than 15%. The benefit of using crushed stone sand instead of natural river sand for concrete: Even though the Crushed sand and River Sand are natural sources, crushed sand is a by-product from crushers while producing coarse aggregate. Few of the Indian states are already put a ban on quarrying of natural sand from the river bed to control the depleting water table. If we compare the cost of natural river sand against crushed sand, the rate is very high. These supply and prices are controlled by the market/...
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STANDARD PROCEDURES FOR TEMPERATURE CONTROLLED CONCRETING

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STANDARD PROCEDURES FOR TEMPERATURE CONTROLLED CONCRETING 1.0      PURPOSE: This procedure covers the required methods for mass concreting in controlled temperature to prevent cracking caused by excessive tensile strains that result from temperature differential within the concrete mass. Cracking can be controlled by methods that limit the peak temperature to a safe level. These method statements have been prepared to provide a general guide, special considerations to be given in relation to the heat of hydration for concrete pours . 2.0       SCOPE: These method statements includes e.g. pre-cooling procedure before & during concrete mix, supply & delivery of concrete, inspection of concrete at the workface and post cooling by a proper cooling upon a completion of concrete placement. 3.0      REFERENCE STANDARD: 2.1       IS: 456, IS: 10262,...
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