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EXPERIMENTAL INVESTIGATION OF THE BOND BETWEEN MASONRY AND DIFFERENT STRENGTHENING MATERIALS
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Volume Title: ICASGE2017
DOI: ICASGE-MAT
Authors
Abstract
Strengthening is often needed to increase the flexural and shear resistance of masonry load- bearing elements. To enable structural analysis and design of strengthening of masonry elements, the structural behavior of such elements should be fully characterized. The stress transfer and the composite action of the strengthened element is achieved by the bond between the masonry and the reinforcing materialand is therefore of primary importance.The objective of the research presented in this paper is to investigate the bond between masonry and the reinforcement. An experimental program is conducted where single-lap shear bond tests were performed on 21 masonry specimens,each of the specimens was prepared from two clay bricks joined using cement mortar. A groove was cut in the bricks, cleaned then Near surface mounted (NSM) steel bars of different diameters and NSM GFRP strips were placed in the groove using either cement mortar or epoxy, some of the specimens were prepared using GFRP strips externally bonded to the masonry units. The test setup and testing procedure are explained where load is applied to pull the reinforcement off the masonry specimen.The experimental results are presented and discussed. The results indicated four modes of failure for the different tests :(1) slipping of the bars from the bonding material, (2) splitting of bar with part of the bonding material,(3) splitting of bar and the whole bonding material from the brick, and (4) splitting of bar with bonding material and part of the brick. Conclusions are drawn regarding the influence of the studied variables on the bond between masonry and the studied strengthening materials, in which the epoxy grout and high grade steel enhance the bond strength much more than using cement mortar and mild steel. Twelve specimen are presented in this paper and the other 9 spacemen are still on going.
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