地聚物混凝土的抗剪性能研究  

Study on the Shear Behaviour of Geopolymer Concrete

作　　者：彭晖[1] 杜运兴[2] PENG Hui;DU Yunxing(National-Local Joint Laboratory of Engineering Technology for Long-term Performance Enhancement of Bridges in Southern District(Changsha University of Science&Technology),Changsha 410076,China;College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]南方地区桥梁长期性能提升技术国家地方联合工程实验室(长沙理工大学),湖南长沙410076 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2023年第3期102-109,共8页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52178206);长沙理工大学南方地区桥梁长期性能提升技术国家地方联合工程实验室开放基金项目(16KF01)。

摘　　要：采用直剪试验研究了地聚物混凝土的抗剪性能.设置16个试验工况,其中包含3个普通混凝土强度的对比工况.试验结果表明,地聚物混凝土的抗剪强度随着混凝土强度和抗剪钢筋配筋率的增大均有显著提高,随着剪切面高度的增加而有所下降,剪切面宽度的改变对其影响较小.该类地聚物混凝土的剪切裂缝发展模式和剪切破坏模式与普通混凝土一致,极限抗剪强度略高于普通混凝土.试验值与Loov和Patnaik的理论值之比的平均值为1.21,该理论值较其他理论值更接近试验值.The shear performance of geopolymer concrete was studied by direct shear test.Sixteen test cases were set up,including three cases with ordinary concrete strength for benchmarking.The test results show that the shear strength of geopolymer concrete increases significantly with the increase of concrete strength and shear rein‐forcement ratio,and decreases with the increase of the shear plane height.The shear plane width has insignificant in‐fluence on the shear strength.The modes of shear crack growth and shear failure of the geopolymer concrete are con‐sistent with those of the ordinary concrete while its ultimate shear strength is slightly higher than that of the ordinary concrete.The mean ratio of the experimental shear strength to the theoretical value by Loov and Patnaik is 1.21,with the Loov and Patnaik value being the closest to the experimental value compared with other theoretical values.

关 键 词：地聚物混凝土 抗剪强度 混凝土强度 配筋率 剪切面尺寸 

分 类 号：TU528[建筑科学—建筑技术科学]