OmdaGéo Posted February 25, 2008 Report Share Posted February 25, 2008 Posté par bentafat_rachid Placing Concrete by Pumping Methods Reported by ACI Committee 304 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. This report does not cover shotcreting or pumping of nonstructural insulating or cellular concrete. Keywords: admixtures; aggregate gradation; aggregates; cement *******; coarse aggregates; concrete construction; concretes; conveying; couplings; fine aggregates; fineness modulus; lightweight aggregate concrete; lightweight aggregates; mix proportioning; pipeline; placing; placing boom; pozzolans; pumped concrete; pumps; quality control; water ******* http://www.zshare.net/download/337281539bdbcd Quote Link to comment Share on other sites More sharing options...
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