International Journal of Advanced Scientific Research

International Journal of Advanced Scientific Research


International Journal of Advanced Scientific Research
International Journal of Advanced Scientific Research
Vol. 3, Issue 1 (2018)

Different methods of placing concrete


Shrikant M Harle

A study was made in the early 1990s of the utilization of the labour and equipment resources in the in situ concreting of buildings in Hong Kong. The study involved close observation of 154 pours on building construction sites and 38 days spent at 38 mixed concrete batching plants one day at each. Much detailed productivity information has been derived and the different concrete placing methods have been compared. This report describes pumps for transporting and placing concrete. Rigid and flexible pipelines are discussed and couplings and other accessories described. Recommendations for proportioning pumpable concrete suggest optimum gradation of aggregates; outline water, cement, and admixture requirements; and emphasize the need for evaluation of trial mixes for pumpability. The importance of saturating lightweight aggregates is stressed. Suggestions are given for layout of lines; for maintaining uniform delivery rate, as well as uniform quality of concrete at the end of the line; and for cleaning out pipelines. The report defines pumped concrete as concrete that is transported through hose or pipe by means of a pump.
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