The American Concrete Institute just published 304.6R-09: Guide for Use of Volumetric-Measuring and Continuous-Mixing Concrete Equipment. This document has been updated to provide current information on the basic design and operation of equipment, frequently called mobile mixers, used to produce concrete by volumetric measurement and continuous mixing (VMCM). The guide covers definitions, applications, and quality assurance testing.

For more information, visit ACI's bookstore at www.concrete.org. E-mail bkstore@concrete.org, or telephone 248-848-3800.