ACI Publishes Two New Documents on Concrete
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The American Concrete Institute (ACI) recently released ACI PRC 211.1-22, Guide to Selecting Proportions for Normal-Density and High Density Concrete. The previous version of this guide was published in 1991 and reapproved periodically without revisions. This updated guide covers some of the newer materials and addresses developing mixtures for permeability, shrinkage, modulus of elasticity and other performance properties. It discusses procedures for trial batches and adjustments and includes several numerical examples for mixture proportioning. Two appendices discuss laboratory testing and proportioning heavyweight concrete mixtures.
ACI also published ACI PRC 132.1-22, TechNote on Responsibility for the Care of Test Specimens for Acceptance of Concrete, developed by Committee 132 on Responsibility in Concrete Construction. This TechNote discusses the implications of improper procedures for curing test specimens at the jobsite that result in strength test results that are not reliable for acceptance of concrete. It summarizes how this is addressed in several ACI standards and indicates that this is an important issue that should be covered in project contract documents and discussed at preconstruction meetings.
These ACI publications can be obtained from ACI at www.concrete.org. For more information, contact Colin Lobo at clobo@nrmca.org.
