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Title |
Mechanical Characterization of PBO Fabric Reinforced Cementitous Matrix
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Authors |
운드람 나디앙자브(Undram Nadianjav) ; 하상수(Sangsu Ha) ; 뭉크투브신 오치버드(Munkhtuvshin Orchirbud) ; 최동욱(Donguk Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.3.279 |
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Keywords |
PBO 섬유메시; 고강도 친환경 모르타르; 인장시험; 층간전단실험; 뽑힘시험 PBO fabric; green high-strength mortar; tensile test; interlaminar shear test; pull-off test |
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Abstract |
Fabric-reinforced cementitious matrix (FRCM) composite is an emerging technology that can be applied to the repair and strengthening of RC members. Polyparaphenylene benzobisoxazole (PBO) fiber fabric was used along with green, high-strength mortar that comprised PBO-FRCM. The objective was to propose basic design parameters through mechanical characterization of a PBO-FRCM system. Three different types of test were conducted: a uniaxial test of tensile specimens; an interlaminar shear test of composite short beams; and a pull-off test of thin FRCM placed on top of normal strength concrete. Tensile test results showed that the tensile properties of the PBO fabric governed the tensile behavior. The nominal tensile strength of the FRCM cross section was 6.12 MPa at 2.15 % strain of the composite material. The short beam strength of 2.07 MPa was determined by the interlaminar shear test performed following ASTM D2344M. In the pull-off test, different failure modes were observed, including tensile failure at the PBO fiber mesh plane in the thin FRCM, interface failure in the tension between the FRCM and the concrete substrate, and tensile failure of the substrate concrete. The average strength of all pull-off tests was 3.69 MPa. Design values were suggested based on current test results of the PBO-FRCM.
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