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A discussion of the paper “the effect of a CaCl2-based accelerator on alkali-silica reaction,” by H. Wang and J.E. Gillott

✍ Scribed by Bryant Mather

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
64 KB
Volume
20
Category
Article
ISSN
0008-8846

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✦ Synopsis

The authors have investigated an interesting relationship and found some rather unexpected results which they have reported very well. I have some questions. I. Should CaCI 2 be expected to do anything to entrain air? Shideler (1952) remarked that "although a precipitate was formed when the CaC12 and the air-entraining agent were added to the mixing water, the effectiveness of neither admixture was impaired to any noticeable extent by the combination," but made no comment as to effects on air content, unit weight, or air-entraining admixture demand. He also said CaCI 2 increases expansion due to AAR, but "when this reaction is controlled by use of low-alkali cement and pozzolan the effect of CaCI 2 appears to be unimportant" and gave other data.

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