ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 26 July 2007
Page Count: 13

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

Nordmeyer, Herb
Project & Technology Manager and Senior Lab Technician, San Antonio Lab, Headwaters Construction Materials, San Antonio, Texas

Hall, Pam
Project & Technology Manager and Senior Lab Technician, San Antonio Lab, Headwaters Construction Materials, San Antonio, Texas

(Received 18 November 2005; accepted 18 June 2007)

Abstract

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.

Keywords:
water absorption, water repellent, mortars, ASTM C 1384

Paper ID: JAI100444
DOI: 10.1520/JAI100444
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