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During a recent experimental investigation at the North Carolina A&T State University, the flexural bond strength of a variety of clay bricks and two masonry cement mortars were evaluated. Twenty prisms, comprising ten different brick types and two mortar types, were tested with a bond wrench testing apparatus to determine the flexural bond strengths of each mortar joint of the seven course prisms. Although the investigation only tested a limited number of prisms, the results of these tests indicated that the initial rate of absorption (IRA) of the brick units can have a greater influence on the flexural bond strength of the masonry assembly than is generally accepted by the masonry industry.
The experimental program is described, its results presented and the apparent effects of brick IRA on flexural bond are discussed.
masonry, brick, flexural, bond, IRA
assistant professor, North Carolina A&T State University, Greensboro, NC