FRP加固再生混凝土圆柱力学性能试验研究

Experimental Study on Mechanical Properties of Recycled Concrete Cylinders Reinforced With FRP

通过混凝土圆柱轴心受压试验,研究了0%、50%、100%3种粗骨料取代率对再生混凝土圆柱抗压强度的影响以及碳纤维(CFRP)布或玄武岩(BFRP)布加固后圆柱的力学性能。试验结果表明:再生骨料取代率对再生混凝土圆柱的力学性能有一定影响,取代率为100%时,圆柱的抗压强度和极限应变均有所增加;而取代率为50%的再生混凝土的横向变形系数略低于天然骨料混凝土的横向变形系数。纤维增强型复合材料(FRP)加固再生混凝土能有效提高结构的承载能力和改善其变形性能,增加构件的延性;其中CFRP加固比BFRP加固效果更为显著。FRP加固再生混凝土与加固天然混凝土类似,其应力-应变曲线表现为明显的双线性,与所选模型计算结果符合良好。

The effects of 3 coarse aggregate replacement ratios(0%, 50%, 100%) on the compressive performance of recycled concrete cylinders were studied through axial compression tests. The mechanical properties of recycled concrete cylinders reinforced with CFRP and BFRP were also investigated. The experimental results show that the recycled aggregate replacement ratio has definite effects on the mechanical properties of the resulting concrete cylinders. The compressive strength and ultimate strain of the recycled concrete cylinders increase measurably when the replacement ratio is 100%. While at a ratio of 50%, the lateral deformation coefficient of the recycled concrete cylinders is slightly lower than that of the natural aggregate concrete ones. The FRP-reinforced recycled concrete cylinders are effectively improved in bearing capacity and ductility. The CFRP has better strengthening effect than the BFRP. The FRP-reinforced recycled concrete is similar to the FRP-reinforced natural concrete with a bilinear stress-strain curve. The experimental data agree well with the results of the selected calculation model.