| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Study on Bridging Stress of Polypropylene Fiber Based on Three-point Bending Test |
| LIANG Ninghui1,2, CAO Guojun1,2, LIU Xinrong1,2, DAI Jifei3,MIAO Qingxu1,2
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1 College of Civil Engineering,Chongqing University,Chongqing 400045,China
2 National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area(Chongqing University),Chongqing 400045,China
3 China Construction Infrastructure Limited Company,Beijing 100044,China |
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Abstract In order to study the variation rule of bridging stress in the fracture process of polypropylene (PP) fiber reinforced concrete, we selected two types of fine PP fiber and one type of coarse PP fiber to prepare fiber reinforced concrete specimens, then carried out three-point bending test of single side notched beam on the specimens, further obtained the load-deformation curve and load-crack mouth opening displacement curve of each specimen. Based on the experimental results, the meso-model for synthetic fibers was employed to fit the bridging stress curve of PP fibers, and the corresponding parameters of PP fibers were determined according to the comparison of the bridging stress curve between the simulated result and the experimental one. The results revealed that the peak bridging stress of fine PP fiber was 0.20—0.22 MPa, and coarse PP fiber exhibited a peak bridging stress of 0.56 MPa. As the crack width growing, the bridging stress of PP fiber presented a variation trend of first increase and then decrease. By determining the parameters of P0, k0 and k1 in the meso-model for fiber pullout, the bridging stress of PP fiber in concrete matrix was calculated. The coarse PP fiber showed strong bridging stress, especially after the cracking of concrete, which could effectively restrain the expansion of macroscopic cracks.
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Published: 03 January 2020
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2020, Vol. 34 
