304.6R-09 Guide for Use of Volumetric-Measuring and Continuous-Mixing Concrete Equipment

304.6R-09 Guide for Use of Volumetric-Measuring and Continuous-Mixing Concrete Equipment

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Description

This guide includes a short history of and information on the basic design and operation of equipment, frequently called mobile mixers, used to produce concrete by volumetric measurement and continuous mixing (VMCM). Definitions, applications, and quality assurance testing are discussed. The use of this equipment is compared with weigh-batch-mixing equipment to highlight some of the limited differences.

Keywords: batcher; continuous mixer; flowing (self-consolidating) concrete; fresh concrete; grout; high-early-strength concrete; latex; mixer; no-fines (pervious) concrete; overlay; precast concrete; shotcrete.

 

Document Details

Author: ACI Committee 304

Publication Year: 2009

Pages: 18.00

ISBN: 9780870313219

Categories: Mixture Proportioning

Formats: PDF

Table of Contents

Chapter 1—Introduction and scope

1.1—Introduction

1.2—Scope

1.3—History

Chapter 2—Definitions

Chapter 3—Equipment

3.1—Materials storage and measurement

3.2—Mixers

3.3—Equipment condition

Chapter 4—Operations

4.1—General

4.2—Production rates

4.3—Planning

4.4—Materials

4.5—Personnel qualifications

Chapter 5—Applications

5.1—General

5.2—Mixtures with short working times

5.3—Low-slump mixtures

5.4—Latex-modified overlays

5.5—Long unloading times

5.6—Concrete at remote sites

5.7—Making small deliveries

5.8—Precast operations

5.9—Hot weather concreting

5.10—Mining applications

5.11—Grouting and pile filling

5.12—Colored concretes

5.13—Emergency applications

5.14—Controlled low-strength fill

5.15—Fiber-reinforced concrete

5.16—Military applications

Chapter 6—Quality control and testing

6.1—General

6.2—Calibration

6.3—Production testing

Chapter 7—Operational precautions

7.1—General

7.2—Cold weather concrete

7.3—Hot weather concrete

7.4—Aggregate moisture

7.5—Rapid slump loss due to false set

7.6—Use of admixtures

7.7—Freshly mixed concrete properties

Chapter 8—References

8.1—Referenced standards and reports

Appendix A—Sample calibration procedure/forms

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