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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.
Question Give a reason that why are high and narrow beams not desirable in concrete piers? Answer Supported on past experience in other, high and narrow beams after
Question Will it advantageous to use concrete of very high power for example exceeding 60MPa? What are potential problems connected with high strength concrete ? Answer To in
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Question Now, mainly flap valves are ended of HDPE. What is the major compensation of using HDPE as compared with cast iron? Answer (i) It has no response with sewage a
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