Study on Pump

Topics: Concrete, Construction aggregate, Pressure Pages: 45 (16216 words) Published: January 11, 2013
ACI 304.2R-96 Placing Concrete by Pumping Methods
Reported by ACI Committee 304
Neil R. Guptill, Chairman David J. Akers Casimir Bognacki* James L. Cope† Michael Gardner Daniel J. Green* Terence C. Holland Thomas A. Johnson* Samuel A. Kalat Robert A. Kelsey* John C. King William C. Krell Gary R. Mass Patrick McDowell Dipak T. Parekh Roger J. Phares* James S. Pierce Paul E. Reinhart Royce J. Rhoads* Kenneth L. Saucier Paul R. Stodola William X. Sypher* Robert E. Tobin* Kevin Wolf

*Member of subcommittee that prepared this report.

of subcommittee that prepared this report.

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 content; 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 content.

2.3—Trailer pumps 2.4—Truck-mounted concrete pumps 2.5—Placing booms 2.6—Specialized equipment 2.7—Safety Chapter 3—Pipeline and accessories, p. 304.2R-5 3.1—General description 3.2—System pressure capacity 3.3—Rigid placing line—Straight sections, bends, and elbows 3.4—System connection 3.5—Flexible system—Hose types and applications 3.6—Concrete placing system accessories Chapter 4—Proportioning pumpable concrete, p. 304.2R-10 4.1—Basic considerations 4.2—Normal weight aggregate 4.3—Lightweight aggregate concrete 4.4—Water and slump 4.5—Cementitious materials 4.6—Admixtures 4.7—Fiber reinforcement 4.8—Trial mixes 4.9—Testing for pumpability Chapter 5—Field practices, p. 304.2R-20 5.1—General 5.2—Pipeline concrete placement 5.3—Powered boom placement

CONTENTS Chapter 1—Introduction, p. 304.2R-2 Chapter 2—Pumping equipment, p. 304.2R-2 2.1—Piston pumps 2.2—Types of valves ACI Committee Reports, Guides, Standard Practices, Design Handbooks, and Commentaries are intended for guidance in planning, designing, executing, and inspecting construction. This document is intended for the use of individuals who are competent to evaluate the significance and limitations of its content and recommendations and who will accept responsibility for the application of the material it contains. The American Concrete Institute disclaims any and all responsibility for the application of the stated principles. The Institute shall not be liable for any loss or damage arising therefrom. Reference to this document shall not be made in contract documents. If items found in this document are desired by the Architect/Engineer to be a part of the contract documents, they shall be restated in mandatory language for incorporation by the Architect/Engineer.

ACI 304.2R-96 supersedes ACI 304.2R-91 and became effective January 1, 1996. Copyright © 1996, American Concrete Institute. All rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by any electronic or mechanical device, printed or written or oral, or recording for sound or visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained for the copyright proprietors.



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