地聚物砂浆植筋的粘结锚固性能  

Anchorage Performance of Post-Installed Steel Bars Using Geopolymer Mortar as Adhesive

作　　者：张海燕[1] 李绮玉 江伟铵 全江霞 ZHANG Haiyan;LI Qiyu;JIANG Weian;QUAN Jiangxia(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China;Guangzhou Runyi Real Estate Development Co.,Ltd.,Guangzhou 511455,Guangdong,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [2]广州市润意房地产开发有限公司,广东广州511455

出　　处：《华南理工大学学报（自然科学版）》2021年第8期65-74,84,共11页Journal of South China University of Technology(Natural Science Edition)

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

摘　　要：地聚物相比于普通波特兰水泥,具有节能环保、快硬早强、收缩小、粘结性能好等优点。为探究地聚物砂浆作为植筋锚固胶的可行性,本研究开展了地聚物砂浆植筋后锚固试件的拉拔试验,考察了基体类型(混凝土、花岗岩)、锚固长度、钢筋直径(d)、加载方式(单调加载和重复加卸载)对地聚物砂浆植筋锚固性能的影响,并与普通水泥砂浆、商业有机植筋胶的相应性能进行了试验比较,还与文献中的无机胶粘结强度进行了对比。结果表明,地聚物砂浆的植筋锚固性能远优于水泥砂浆,与商业有机植筋胶相近。以地聚物砂浆作为植筋胶,使用直径为16 mm的带肋钢筋在混凝土基体和花岗岩基体中进行植筋时,达到12 d的构造锚固深度即可满足规范中关于植筋胶的粘结锚固质量要求。同时,在经历不超过70%峰值荷载水平的多次重复加卸载后,地聚物砂浆植筋的粘结锚固性能没有显著退化。因此,地聚物砂浆可作为混凝土基体和花岗岩基体中的一种植筋锚固材料应用于实际工程中。Compared with ordinary Portland cement,geopolymer has the advantages of environmental friendliness,fast hardening and high early strength,smaller shrinkage,and better bond behavior.To investigate the feasibility of using geopolymer mortar as anchorage adhesive,pull-out tests were conducted on post-installed steel bars anchored by geopolymer mortar.Influences of substrate type(concrete,granite),anchorage depth,rebar diameter,and loading mode(monotonic,repeated)on anchorage performance of geopolymer mortar were investigated.Geopolymer mortar was compared with usual cement mortar and commercial organic adhesive,and its bond strength was compared with that of inorganic adhesive reported in literature.The results show that the anchorage performance of geopolymer mortar is significantly better than that of cement mortar and is almost equivalent to that of commercial organic adhesive.For a ribbed rebar with a diameter(d)of 16 mm,when using geopolymer mortar as adhesive in concrete and granite substrate,a minimum embedded depth of 12 d required by code can already satisfy the ancho-rage quality requirements.Furthermore,it is also showed that the anchorage performance of geopolymer mortar has no significant degradation under repeated loading,at a repeated loading level not higher than 70%of the ultimate load.Thus,geopolymer mortar can be used as anchorage adhesive for post-installed steel bars in the concrete substrate and granite substrate in practice.

关 键 词：地聚物砂浆 植筋 锚固性能 粘结强度 重复加卸载 

分 类 号：TU501[建筑科学—建筑技术科学]