Placing Concrete by Pumping Methods


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Title: Placing Concrete by Pumping Methods

Author(s): ACI Committee 304

Publication: Journal Proceedings

Volume: 68

Issue: 5

Appears on pages(s): 327-347

Keywords: admixtures; aggregate gradation; aggregates; cement content: coarse aggregates; concrete construction; concretes: conveying; couplings; fine aggregates;fineness modulus; lightweight aggregate concretes; lightweight aggregates; mix proportioning.

Date: 5/1/1971

Describes piston, pneumatic, and squeeze-pressure type pumps for transporting and placing structural concrete. Rigid and flexible pipelines are discussed, couplings and other accessories described, and delivery capacity for various sizes of lines reported. Recommendations for proportioning pumpable concrete suggest optimum gradation of aggregates; outline water, cement, and admixture requirements; and emphasize the need for field testing of trial mixes for pumpability. Importance of presoaking of 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 types of concrete.