ACI 309R-05 PDF

ACI 309R-05 PDF

June 25, 2020

Download ACI R – Guide for Consolidation of Concrete. ACI R – Guide for Consolidation of Concrete Thu, 22 Nov GMT. ACI R – Guide for Consolidation of Concrete. June 3rd, – Sat 11 Mar 23 55 00 GMT aci r 05 pdf ACI R 05 Guide for Consolidation of Concrete. Free download as PDF File pdf Text File txt .

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R Guide for Consolidation of Concrete

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ACI 309R-05 – Guide for Consolidation of Concrete

Consolidation is the process of removing entrapped air from freshly placed concrete. Several methods and techniques are available, the choice depending mainly on the workability of the mixture, placing conditions, and degree of air removal desired. Some form of vibration is usually employed.

This guide includes information on the mechanism of consolidation and gives recommendations on equipment, characteristics, and procedures for various classes of construction. The paired values stated in inch-pound units and hard SI units are usually not exact equivalents. Therefore, each system is to be used independently of the other. Combining values from the two systems may result in nonconformance with this guide.

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ACI Committee Reports, Guides, Standard Practices, 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 309r-005 the 309r–05 of the material it contains.

The American Concrete Institute disclaims any and all responsibility for 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. 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 electronic or mechanical device, avi, 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 from the copyright proprietors.

If allowed to harden in this condition, the concrete will be porous and poorly bonded to the reinforcement. 3309r-05

It will have low strength, high permeability, and poor resistance to deterioration. It may also have a poor appearance. The mixture should be consolidated if it is to have the properties desired and expected of concrete. Consolidation is the process of inducing a closer arrangement of the solid particles in freshly mixed concrete or mortar during placement by the reduction of voids, usually by vibration, centrifugation spinningrodding, spading, tamping, or some combination of these actions.

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Stiffer mixtures require greater effort to achieve proper consolidation. By using certain chemical admixtures ACI As the water content of the concrete is reduced, concrete strength, permeability, and other desirable properties improve, provided that the concrete is properly consolidated. If adequate consolidation is not provided for these stiffer mixtures, the strength of the in-place concrete decreases rapidly.

Equipment and methods are now available for fast and efficient consolidation of concrete over a wide range of placing conditions.

Concrete with a relatively low water content can be readily molded into an unlimited variety of shapes, making it a highly versatile and economical construction material.

When good consolidation practices are combined with good formwork and good form release agents, concrete surfaces have a highly pleasing acu Fig.

Mixture proportioning is described in ACI These methods are infrequently used. The various consistency tests have been discussed by NevilleVollickand Ferraris Please fill this form, we will try to respond as soon as possible. Please copy and paste this embed script to where you want to embed Embed Script. Size px x x x x We need your help!

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