In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Chat with Us Online Now
Feedback via Email
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: Supplementary Data on the Effect of Concrete Aggregate Having Low Thermal Coefficient of Expansion
Author(s): J. C. Pearson
Publication: Journal Proceedings
Appears on pages(s): 33-40
Abstract:This is a continuation of the study reported in A Concrete Failure Attributed to Aggregate of Low Thermal Coefficient, V. 38, p. 29. A limited num-ber of tests were made on 2 x 2 x IO-in. bars con- taining two types of low coefficient aggregates and one type of silica pebbles, which were submitted to cycles of temperature changes from -20 F to room temperature. After about 50 cycles, bars containing the low coefficient aggregates lost 40 to 50 percent of their original modulus of elasticity whereas the bars containing silica pebbles lost only 2 or 3 percent of their original modulus. Expansions during these cycles were not large but that of the low coefficient aggregate bars was 3 or 4 times that of the silica pebble bars. After 100 cycles of temperature changes, the bars were submitted to freezing and thawing cycles of the same temperature range as before. The bars containing the low coefficient aggregates succumbed rapidly to the frost action while the silica bars were only moderately affected by the same treatment. The results lend further support to the conclusion of the earlier paper by the author, namely, that low thermal coefficient aggregates can be a source of danger in concrete exposed in cold climates.
Click here to become an online Journal subscriber