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QuestionWhat are the key problems if use pumping for concreting works?
AnswerIn pumping operation, force exerted by pumps have to overcome friction involving concrete and pumping pipes, weight of concrete and pressure head when placing concrete above pumps. In actuality, as only water is pump able, it is water in concrete that transfers force. Major problems associated with pumping are effect of isolation and bleeding. To rectify these adverse effects proportion of cement is increased to improve cohesion sequentially to decrease segregation and bleeding. On other hand, the proper selection of aggregate grading helps to get better pump capability of concrete.
Joint filler in concrete expansion joints - a must?? Presence of joint filler is required to the proper functioning of concrete joints however some may doubt its value. For a c
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Semi Dense Bituminous Concrete: Semi Dense Bituminous Concrete (SDBC) is similar to BC, but with a higher void content (5-10 per cent, as against 3-5 per cent in the case of
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Q. Specification of Wood work for Door? 1. General - Timber for door, window and ventilators frames shall be as specified. Timber shall be sawn in the direction of the grains.
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Material of steel tendons The material of steel tendons also must be of a high strength. Tendons should possess required material and geometrical properties so that a desired
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