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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 Comparing speed of "Formwork exceeding 300mm wide, horizontal and at any inclination up to and including 5o to horizontal" with speed of "Formwork exceeding 300mm wide, at
Compute the safe bearing capacity of a square footing 1.5 m × 1.5 m, located at a depth of 1 m below the ground level in a soil of average density 20 kN/m 3 . = 20°, N c = 17.7,
Q. Briefly explain about Artificial cut offs? Alignment of a cut off is chosen so that approach and exit ends remain more or less tangential to the river course. A cut off can
Explain the Limitations of Rebound Hammer? The following characteristics of concrete can affect the correlation of the rebound number with the actual surface hardness and shoul
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Determine the example of tendon splices Following are some examples of tendon splices. (a) Torpedo splice (b) Clamp splice (c) Screw connectors
definion of local attraction and correction
Define the pre-tensioned concrete construction We understand that in the pre-tensioned concrete construction, stretched tendons are provided in the concrete moulds at the time
The angle between the members at the joint is 30°. Design the members at the joint. Design also the connection of the members at the joint. The length of the principal rafter betw
Q. Explain Dissolved Impurities in water? The impurities which are caused by the action of water and water forming Acids with organic matter and carbon dio
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