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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: A Study of Alkali-Aggregate Reactivity by Means of Mortar Bar Expansion
Author(s): T. M. Kelley, L. Schuman, and F. B. Hornibrook
Publication: Journal Proceedings
Appears on pages(s): 57-80
Keywords: no keywords
Abstract:Many types of aggregate were combined in varying amounts and sizes with high- and low-alkali cements and formed in to 1 x 1 x 10-in. mortar bars. The bars were stored either at 70 F or at 100 F and their expansions measured at ages raging from 1 month to 4 years. In combination with high-alkali cements, opal, opaline chert and a siliceous dolomitic limestone were found to cause greatest expansion. Certain aggregates containing volcanic glasses and some natural sands and gravel also caused excessive expansion; with one exception, these sands contained small amounts of opal. Greatly delayed expansion resulted with the very fine sizes of opal, particularly in combination with high-soda cement. Similar behavior resulted with No. 81 size opal and low-alkali cement with either Na2SO4 or K2SO4 additions. Materials such as dehydrated kaolin, soda feldspar, magensium flusilicate, acetic acid and calcium hydroxide added in small amounts as correctives were ineffective. However, diatomaceous earth in sufficient quantity as a cement rplacement eliminated expansion.
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