Title: Placing Concrete by Pumping Methods (ACI 304.2R)

Author(s): ACI Committee 304

Publication: Materials Journal

Volume: 92

Issue: 4

Appears on pages(s): 441-464

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

DOI: 10.14359/1041

Date: 7/1/1995

Abstract:
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, and suggestions are given for layout of lines, maintaining uniform delivery rate, as well as uniform quality of concrete at the end of the line, and cleaning out pipelines. This report does not cover shotcreting or pumping of nonstructural insulating or cellular concrete.