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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.
Define the Thiem Equations for Confined Aquifers Using natural log: Q = 2ΠKm(h 2 - h 1 )/ln(r 2 /r 1 ) m = aquifer thickness (ft) Using log 10 : Q = 2Km(h 2 - h
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Q. What do you mean by Piston sampler? In sampling silts orclays, Piston sampler is lowered into boreholes and piston is locked at bottom of the sampler. This stops debris from
Advantages of unbonded post-tensioning systems Similarly, some advantages of unbonded post-tensioning systems over bonded post-tensioning ones may be written as under : (a)
Define Types of Deterioration in Steel Substructure There are 5 major types of deterioration in steel substructure in the marine environment: - Corrosion - Abrasion - Loo
Dock Wall and Dry Dock: Dock Wall Figure gives the diagram of a dock wall. Figure: Mass Concrete Dock Wall Dry Dock Figure 9 gives the details
Geometric Design Of Roads: Geometric design of roads deals with elements such as cross-section, horizontal and vertical alignment, sight distances, lateral and vertical cleara
The classification as soft wood and hard wood has commercial significance. The difference between soft wood and hard wood is described below: The color of soft wood is light
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