Title:
Factors Affecting Performance of Unit Masonry Mortar
Author(s):
William L. Zemaitis
Publication:
Journal Proceedings
Volume:
56
Issue:
12
Appears on pages(s):
461-472
Keywords:
none
DOI:
10.14359/8106
Date:
12/1/1959
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.