钢筋-地聚物混凝土黏结性能梁式试验研究  

Beam tests on bond behavior between geopolymer concrete and steel bars

作　　者：闫佳[1] 张海燕[1] 吴波[1] YAN Jia;ZHANG Haiyan;WU Bo(State Key Laboratory of Subtropical Architecture Science,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点试验室

出　　处：《建筑结构学报》2019年第12期178-186,共9页Journal of Building Structures

基　　金：国家重点研发计划(2017YFC0703303);广东省交通运输厅科技项目(科技-2016-02-008);广州市科技计划项目(201804010438)

摘　　要：通过10根钢筋-地聚物混凝土梁式试件的拉拔试验,研究了箍筋间距、拉拔钢筋黏结长度对钢筋-地聚物混凝土黏结性能的影响。结果表明:当箍筋间距从150 mm减小至100 mm时,钢筋-地聚物混凝土之间的黏结强度增加较少,但是试件的延性明显提高;随着黏结长度增加,试件由黏结破坏变为受弯破坏;对于直径d=18 mm的拉拔钢筋(变形钢筋),7d的黏结长度可使其在钢筋-地聚物混凝土界面黏结破坏前屈服。将试验结果与已有文献中的钢筋-普通水泥混凝土梁式拉拔试件以及钢筋-地聚物混凝土中心拉拔试件的试验结果进行比较后发现,所制备的地聚物混凝土与钢筋之间的黏结强度不低于相近试验条件下普通水泥混凝土与钢筋之间的黏结强度;采用梁式拉拔试验测得的钢筋与地聚物混凝土之间的黏结强度高于相同试验参数下采用中心拉拔试验获得的黏结强度。Ten reinforced geopolymer concrete beams were tested to investigate the influences of stirrup spacing and anchorage length of steel bars on the bond behavior between geopolymer concrete and steel bars. The test results show that when the stirrup spacing is reduced from 150 mm to 100 mm,no significant increase is found in the bond strength between geopolymer concrete and steel bars,but the ductility of the beam increases greatly. With an increase in the anchorage length of steel bars,the failure modes of the tested beams change from bond failure to flexural failure. For beam specimens with pulled-out rebar( deformed rebar) of a diameter( d) of 18 mm,an anchorage length of 7 d is long enough to make the rebar yield before the bond failure at the interface between geopolymer concrete and rebars.The bond strength with rebars of geopolymer concrete obtained through beam specimens in this study was compared with that of ordinary cement concrete through beam specimens in the literature,and that of geopolymer concrete obtained through central pull-out specimens in previous studies. The results show that the bond strength of geopolymer concrete prepared in this study is not lower than that of ordinary cement concrete in the literature,obtained through beam specimens under similar test conditions. The bond strength between geopolymer concrete and steel bars obtained from beam tests is higher than that from central pull-out tests with the same test parameters.

关 键 词：地聚物混凝土 钢筋 梁式试验 黏结性能 

分 类 号：TU5[建筑科学—建筑技术科学]