Practical Implications of Lithium-Based Chemicals and Admixtures in Controlling Alkali-Aggregate Reactions

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Title: Practical Implications of Lithium-Based Chemicals and Admixtures in Controlling Alkali-Aggregate Reactions

Author(s): H. Wang, S. Tysl, and J. E. Gillott

Publication: Special Publication

Volume: 148

Issue:

Appears on pages(s): 353-366

Keywords: admixtures; air entrainment; alkali-aggregate reactions; compressive strength; expansion; flexural strength; freeze-thaw durability; lithium compounds; water-cement ratio; Materials Research

Date: 9/1/1994

Abstract:
Two well-understood and defined reactions in concrete are known as alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR). These two reactions are extremely detrimental to the integrity of concrete structures. It is known that lithium-based chemical compounds can control and/or eliminate the expansion caused by ASR. Based on this technology, a commercial chemical admixture has been developed. The admixture is a ready-to-use liquid product formulated to meet ASTM C 494 requirements as a Type A water-reducing admixture. This product is not intended to control ACR-induced expansion. Therefore, identification of the types of alkali-aggregate reactions is necessary to effectively control concrete expansion.