Question

Pumping be not used in case of concreting works.

(a) True

(b) False

I had been asked this question by my college professor while I was bunking the class.

Enquiry is from Finishing Work in section Rules and Methods of Measurement of Civil Engineering Drawing

Answer 1

The correct answer is (a) True

The best I can explain: During the pumping operation the pump exerted pressure must overcome any friction between the pumping pipes and the concrete, also the weight of the concrete and the pressure head when the concrete is placed above the pumps. Since only water is pump able, all the pressure generated is by the water that is present in the concrete. The major problem due to pumping are segregation effects and bleeding. In order to rectify and reduce these effects, generally the proportion of the cement is increased in order to increase the cohesion, which leads to the reduction of segregation and bleeding. Also if a proper selection of the aggregate grading can vastly improve the concrete pump ability.