SYMPOSIA PAPER Published: 01 January 2008
STP45705S

Variations in the Activity of Dry-Powder Water-Repellent Mortar Admixtures with Different Mortar Formulae

Source

A number of water repellents are added to masonry mixes and masonry units. To be classified as a water-repellent mortar admixture, ASTM C 1384 Specification for Admixtures for Masonry Mortars, requires that the 24-h rate of water absorption needs to be reduced by at least 50 % when compared to a control mortar without the admixture. While testing two well-known water-repellent admixtures, a substantial difference in activity was noted with the mortar that was being tested. Testing was expanded to include other water-repellent admixtures and several additional mortar formulae. This paper discusses the findings of that study.

Author Information

Nordmeyer, Herb
San Antonio Lab, Headwaters Construction Materials, San Antonio, Texas
Hall, Pam
San Antonio Lab, Headwaters Construction Materials, San Antonio, Texas
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Details
Developed by Committee: C12
Pages: 49–61
DOI: 10.1520/STP45705S
ISBN-EB: 978-0-8031-6272-3
ISBN-13: 978-0-8031-3492-8