期刊
CEMENT & CONCRETE COMPOSITES
卷 64, 期 -, 页码 37-48出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2015.07.007
关键词
Bond; Cementitious matrix; Debonding; Double-lap shear test; FRCM composite; Single-lap shear test
资金
- National University Transportation Center (NUTC) at Missouri ST
This paper presents the results of an investigation on the bond behavior and stress-transfer mechanism of polyparaphenylene benzobisoxazole (PBO) fiber-reinforced cementitious matrix (FRCM) composites bonded to a concrete substrate using double-lap and single-lap shear tests. Results of double-lap shear tests with different composite bonded lengths and widths are presented and compared with those from single-lap shear tests previously reported by the authors. The idealized load response developed from single-lap shear tests is found to characterize the response of the composite in double-lap shear tests, although with a few key differences. With the double-lap shear test, load redistribution among the composite strips influences the post-peak response if debonding does not occur equally in both strips. Values of the ultimate (peak) stress determined using double-lap shear tests are generally consistent with, although slightly lower than, those determined by single-lap shear tests when the bonded length is longer than the effective bond length. (C) 2015 Elsevier Ltd. All rights reserved.
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