When strengthening historic unreinforced masonry structures, it is important to preserve their appearance. Considering that mortar joints are the weakest part of a brick wall, we proposed a new repair technique using the injection of epoxy resin into these joints. The proposed method is to inject low viscous epoxy resin into the mortar using a very low pressure. This paper presents the results of the fundamental loading tests with brick elements and brick walls. Based on the test results, the following conclusions were made.(1) An increase in the strength of the element was observed in each test. (2) The effects of epoxy resin injection were confirmed in the brick wall without the axial force.
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