304.6R-91
Guide for the Use of Volumetric-Measuring and Continuous-Mixing Concrete Equipment (Reapproved 1997)
1991, 14 pp.
$33.50

This guide includes a short history of and the information on the basic design and operation of equipment used to produce concrete by volumetric measurement and continuous mixing (VMCM), frequently called mobile mixers. Definitions, applications, and quality assurance testing are discussed. The use of this equipment is compared to weigh-batch-mix equipment for some of the limited differences. It contains background information on VMCM and items to be considered when using it. A discussion of the types of continuous-measurement equipment (i.e. conveyor belt scales or weigh-in-motion scales) is outside the scope of this report.

Contents:

Chapter 1--Introduction

1.1--General
1.2--Discussion
1.3--History

Chapter 2--Equipment

2.1--Materials storage and measurement
2.2--Mixers
2.3--Equipment condition

Chapter 3--Operations

3.1--General
3.2--Production rates
3.3--Planning
3.4--Materials
3.5--Personnel qualifications

Chapter 4--Applications

4.1--General
4.2--Mixtures with short working times
4.3--Low-slump mixtures
4.4--Long unloading times
4.5--Concrete at remote sites
4.6--Making small deliveries
4.7--Precast operations
4.8--Hot weather concreting
4.9--Mining applications
4.10--Grouting and pile filling
4.11--Colored concretes
4.12--Emergency applications

Chapter 5--Quality control and testing

5.1--General
5.2--Calibration
5.3--Production testing

Chapter 6--Operational precautions

6.1--General
6.2--Cold weather concrete
6.3--Hot weather concrete
6.4--Aggregate moisture
6.5--Rapid slump loss
6.6--Use of admixtures
6.7--Fresh concrete properties

Chapter 7--References

7.1--Specified and/or recommended references
7.2--Cited references

Appendix A--New York State DOT calibration method