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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.
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Write a Survey Paper: Write between 7 to 10 pages a survey paper in one of the following topic : ( The Future of HCI. ) For the paper the font size should be 12 points
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If the resultant forces are resolved in the three co-ordinate directions and divided by the area of the face of the cube we have the general state of 3-dimensional stress as shown.
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