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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: Factors Affecting Performance of Unit Masonry Mortar
Author(s): William L. Zemaitis
Publication: Journal Proceedings
Appears on pages(s): 461-472
Abstract:Laboratory and field mortars, made according to ASTM C 270, were investigated for durability and then compared to determine whether taboratory tests could be used to check field durability. First, a laboratory investigation was made on durability of mortar mixtures using standard sand and two masonry cements meeting ASTM C 91 specifications, and using cement-lime-sand mixtures composed of eight different brands of limes. Three cement-lime-sand mixtures were investigated: 1;1;6, 1:1 1/4:6 a n d 1:2:9. Second, a field-mix investigation was made and it showed that about 13 percent entrained air was necessary to pro-tect Types 0 and K, ASTM C 270 combinations, against freezing and thawin for Types failure, and 11 percent was needed N . All cement-lime-sand combinations needed the addition of an air-entraining agent for durability. All masonry cement mixes were durable with-out the need of additional air-entraining agents. It was found that materials tested for durability in the laboratory with Ottawa sand at a flow of 1 10 *5 showed good re-lationship to their durability performance at an average field consistency (130 *5 flow). The field mixes used an ASTM median-graded field sand and a Field mixer.
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