Effect of Composite Reinforcement Layer Thickness on Flexural Behavior of Reinforced Concrete Beams Strengthened with PVA-RFCC
DU Wenping1, YANG Caiqian1,2, WANG Chong1
1 Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China 2 College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China
Abstract: In order to both improve the crack resistance and ultimate load carrying capacity of reinforcement member significantly. A new type of polyvinyl alcohol fiber reinforced ferrocement engineered cementitious composite (PVA-RFCC) was proposed, which was composed of reinforcement mesh (RM) and steel mesh (SM) as a reinforcing element and polyvinyl alcohol fiber engineered cementitious composite (PVA-ECC) as a matrix. Seven strengthened beams and one control beam (CB) were prepared and tested using four-point bending system. Composite reinforcement layer (CRL) thickness was main parameter for investigating the influence of flexural behavior. Simultaneously, the expression of optimum CRL thickness was deduced. The results showed that the flexural behavior of the strengthened beams decreased with increasing CRL thickness when PVA-ECC was included or SM was added to the CRL, whereas they increased when RM was included or SM-RM was added to the CRL. The relationship between the CRL thickness and ultimate load was quadratic function. The coupling effect of SM-RM provided the best strengthening method, the SM can improve the ductility, and the RM can improve the load carrying capacity and stiffness. Combined with the experimental and theoretical results, the optimum CRL thickness was 40 mm when the PVA-ECC was included or SM was added to the CRL, and was 60 mm when RM or SM-RM was added in strengthened beams.
杜文平, 杨才千, 王冲. 加固层厚度对PVA-RFCC加固梁弯曲性能的影响[J]. 材料导报, 2021, 35(4): 4067-4073.
DU Wenping, YANG Caiqian, WANG Chong. Effect of Composite Reinforcement Layer Thickness on Flexural Behavior of Reinforced Concrete Beams Strengthened with PVA-RFCC. Materials Reports, 2021, 35(4): 4067-4073.
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