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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.
Cement is usually purchased as a powdery substance that is mixed with sand, aggregate, gravel, and water to form concrete. As the cement itself is usually a powder, it is hard to c
Q. Permanent Repairs to rail fracture? (i) If the fracture is such that, wide gap A T welding ban be adopted, then the total length of fractured ends to-be cut shall be equal t
Q. What do you understand by Percolation of water? Percolation of water into the ground or embankment takes place, causing rise in water table and / or saturation of the body.
how to reslove the above question
Explain the Suppressed Rectangular Weir If the length of the weir (b) equals the width of the channel, i.e., the flow is not "contracted".
Define Reinforcing Steel - Limitations of Ultrasonic System? The sound velocity measurement taken parallel to the reinforcing bars embedded in the concrete will be markedly hig
Q. Reasons for blockage in pumping concrete ? Concrete pumping is normally adopted in highly elevated locations for which access for concrete trucks is difficult. Construction
Resultant Force on a Given Area of an Inclined Plane The resultant force is calculated from the average pressure: R = (AVERAGE P)(A)
Q. What are the Parasitic forces for prestressing? In statically determinate structures, prestressing forces will cause the concrete structures to end upwards. Therefore precam
What relationship between Atterberg limits and cohesion
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