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为了研究钢筋再生混凝土楼板的力学性能,共设计了6个试件,其中3个单向板和3个双向板,主要以再生粗骨料取代率为变化参数,取代率分别为0%,50%,100%。通过对两类楼板进行抗弯试验,观察试件的破坏形态、获取了试件受力的全过程曲线、跨中挠度发展情况及构件的极限承载力等重要数据,并分析再生粗骨料取代率对单向板和双向板的影响,利用相关规范的计算方法对再生混凝土楼板承载能力进行计算,并与试验实测结果进行对比。试验结果表明:不同骨料取代率的楼板破坏形态相似;在混凝土出现裂缝前,随着荷载的增加,楼板的挠度基本呈线性增大;当混凝土开裂后,钢筋再生混凝土楼板的挠度增大有突变;钢筋再生混凝土单向板的刚度比钢筋普通混凝土单向板好,双向板则相反;钢筋再生混凝土楼板与钢筋普通混凝土楼板相比,两者开裂荷载较为接近,但钢筋再生混凝土楼板有极限承载力高的优点。研究结果可为钢筋再生混凝土板构件的进一步研究和推广应用提供参考。
In order to study the mechanical properties of recycled concrete slab, a total of six specimens were designed, of which three one-way and three two-way slab, the main replacement rate of recycled coarse aggregate as a parameter, the replacement rates were 0%, 50 %, 100%. Through the bending test of two types of floor, observe the destruction form of the specimen, get the whole process curve of specimen force, the development of mid-span deflection and the ultimate bearing capacity of the member and other important data, and replace the recycled coarse aggregate Rate of one-way board and two-way board, the use of relevant specifications of the calculation method of recycled concrete floor carrying capacity is calculated and compared with the test results. The test results show that the failure modes of the slab with different aggregate substitution rates are similar. Before the concrete cracks occur, the deflection of the slab increases linearly with the increase of load. When the concrete is cracked, the deflection of rebar concrete slab increases with Compared with reinforced normal concrete one-way slab, rebar reinforced concrete one-way slab has better rigidity than ordinary reinforced concrete one-way slab, while two-way slab is the opposite. Compared with ordinary reinforced concrete slab, cracking load is close, The advantages of high carrying capacity. The results can provide reference for the further research and popularization and application of reinforced concrete slab members.