SYMPOSIA PAPER Published: 01 January 1993

A Study of the Compatibility of Brick and Mortar or Maximizing Masonry Bond Strength


With the increasing prevalence of steel-stud brick-veneer curtain wall construction, the requirement for reliable bond strength has become critical for sound masonry performance. This paper presents a study, including test data and the result interpretation, used in the selection of a compatible brick and mortar mix for a particular project and a comparison with current design practice. Eight (8) brick types and 24 mortar mixes were examined. Of the 24 mortar mixes, 20 were Type “S.” The study was conducted in three parts. The first part commenced in May of 1987, and the third part continues today, with prisms over 1,600 days old. The results of 110 flexural tests conducted in accordance with ASTM Test Method for Flexural Bond Strength of Masonry (E 518), and over 1,700 bond-wrench tests conducted in accordance with ASTM Method for Measurement of Masonry Flexural Bond Strength (C 1072) are presented. This study reinforces the need for research and compatibility testing in the selection of the masonry components to be used on a project where reliable bond strength is required.

Author Information

Krauklis, AT
Raths, Raths & Johnson, Inc., Willowbrook, IL
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Developed by Committee: C12
Pages: 121–151
DOI: 10.1520/STP19610S
ISBN-EB: 978-0-8031-5235-9
ISBN-13: 978-0-8031-1492-0