1. Scope
1.1 This guide provides guidance on how to address the potential for deleterious alkali-aggregate reaction (AAR) in concrete construction. This guide addresses the process of identifying both potentially alkali-silica reactive (ASR) and alkali-carbonate reactive (ACR) aggregates through standardized testing procedures and the selection of mitigation options to minimize the risk of expansion when ASR aggregates are used in concrete construction. Mitigation methods for ASR aggregates are selected using either prescriptive or performance-based alternatives. Preventive measures for ACR aggregates are limited to avoidance of use. Since the potential for deleterious reactions is dependent not only on the concrete mixture but also the in-service exposure, guidance is provided on the type of structures and exposure environments where AAR may be of concern. 1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Concrete producers, testing laboratories, and concrete specifiers have expressed the need for an ASTM standard that addresses the AAR issue with guidance for the process of identifying reactive aggregates and minimizing the risk of expansion when these aggregates are used in concrete construction.
Keywords
AAR; ACR; alkali-aggregate reaction; alkali-carbonate reaction; alkali-silica reaction; ASR; concrete; concrete durability; laboratory testing; pozzolans; reactive aggregates; risk evaluation; supplementary cementitious materials
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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