基于改性磷酸盐水泥的CFRP网格加固钢筋混凝土板的受弯试验

采用碳纤维(Carbon Fiber Reinforced Polymer,CFRP)网格增强无机改性磷酸盐水泥基材料(Magnesium Phosphate Cementitious,简称MPC)加固钢筋混凝土板,MPC是对磷酸盐水泥在配合比和矿物掺合料两个方面进行改性优化,该加固方法充分利用了MPC具有早期强度高、低收缩、与旧混凝土黏结力强、良好的耐久性、防火防老化等优点。主要开展了CFRP网格增强MPC水泥基体加固混凝土板的抗弯试验,试验结果表明,破坏模式为混凝土板与加固层界面的剥离破坏;加固后板的开裂荷载提高了133%,极限荷载提高了108%。CFRP网格增强无机磷酸盐水泥基体复合材料加固技术不仅能够有效地提高混凝土板的抗弯承载力,还可以提高构件的刚度和抗裂性能。

Bending test of reinforced concrete slabs strengthened with CFRP mesh based on magnesium phosphate cementitious

Carbon fiber(Carbon Fiber Reinforced Polymer,CFRP)grid-reinforced inorganic modified phosphate cement-based material reinforced concrete slab is used to make full use of modified phosphate cement-based materials with high early strength,low shrinkage,and concrete adhesion.Strong,good durability,fire and anti-aging,etc.,so the concrete reinforcement method can significantly improve the reinforcement effect.The modified phosphate cement-based composite material is modified and optimized for the ratio of phosphate cement in the mixture ratio and mineral admixture.The bending failure mechanism of CFRP grid-reinforced inorganic phosphate cement matrix reinforced concrete slab is mainly analyzed.The test results show that the failure mode is the peeling failure of the interface between the concrete slab and the reinforcement layer.The cracking load of the test plate increases by 133%after the reinforcement,and the ultimate load increases by 108%.CFRP mesh reinforced inorganic phosphate cement matrix composite reinforcement technology can not only effectively improve the flexural capacity of reinforced concrete slabs,but also improve the stiffness and crack resistance of reinforced components.