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为研究中强再生混凝土板的抗弯性能,进行了2个足尺再生混凝土板和2个普通混凝土板的抗弯性能对比试验。试件再生混凝土粗骨料取代率100%、细骨料用天然砂,混凝土设计强度等级均为C40,加载方式为三分点单向重复加载。试验分析了各试件的开裂荷载、屈服荷载、极限荷载、挠度、裂缝及损伤过程。研究表明:中强再生混凝土楼板与中强普通混凝土楼板相比,受弯破坏过程类似,开裂荷载相近、极限荷载较低,跨中挠度略大;中强再生混凝土楼板承载力和正常使用状态下的挠度和裂缝宽度计算可近似采用混凝土结构设计规范的方法,但应乘以与再生粗骨料取代率有关的折减系数,以考虑其长期工作性能与短期试验结果的差异。
In order to study the flexural behavior of medium-strength recycled concrete slabs, comparative tests on flexural strength of two full-length recycled concrete slabs and two normal concrete slabs were carried out. Recycled concrete specimens coarse aggregate replacement rate of 100%, fine aggregate with natural sand, concrete design strength grade are C40, the loading method is one-third of one-way repeated loading. The cracking load, yield load, ultimate load, deflection, crack and damage process of each specimen were analyzed. The results show that compared with ordinary concrete floor, the medium-strength recycled concrete floor has similar bending failure process, similar cracking load, lower ultimate load and slightly greater mid-span deflection. The bearing capacity of medium-strength recycled concrete floor and normal use condition The calculation of deflection and crack width can be approximated using the design code for concrete structures but should be multiplied by the reduction factor related to the replacement rate of recycled coarse aggregate to account for differences in long-term performance and short-term test results.