Performance of Structural Lightweight Concrete Made With a Potentially Reactive Natural Sand

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Title: Performance of Structural Lightweight Concrete Made With a Potentially Reactive Natural Sand

Author(s): S.R. Boyd, T.A. Holm, and T.W. Bremner

Publication: Special Publication

Volume: 234

Issue:

Appears on pages(s): 737-746

Keywords: alkali-silica reaction; cement; compressive strength; expansion; lightweight concrete; tensile strength

Date: 3/22/2006

Abstract:
For more than fifty years, a large number of bridge decks and parking structures have been constructed using lightweight concrete. In most cases, the lightweight concrete has been made using a lightweight coarse aggregate and a normal weight sand for the fine aggregate. Some of the natural sands used have been shown to be at least partially susceptible to alkali-silica reaction (ASR). Many of the bridge decks have been in service for at least 30 years and show no outward signs of deterioration due to ASR. A test program was undertaken to determine how concrete made with lightweight coarse aggregate and reactive sand does not show the effects of ASR. Properties measured include expansion, indirect tensile strength and compressive strength. Test results indicate no significant difference in performance between concrete mixes with lightweight coarse aggregate combined with either reactive, non reactive, or lightweight fine aggregate.