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中强再生混凝土楼板抗弯性能试验研究

DOI: 10.13577/j.jnd.2015.0315, PP. 112-119

Keywords: 中强再生混凝土,单向板,抗弯性能,试验研究

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Abstract:

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。

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