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引用本文:	黄一杰,李晓蔚,张锡成,马辉.环氧涂层钢筋与海水珊瑚混凝土的黏结性能[J].建筑材料学报,2020,23(5):1086-1092

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环氧涂层钢筋与海水珊瑚混凝土的黏结性能
黄一杰¹, 李晓蔚¹, 张锡成², 马辉³
1.山东科技大学土木工程与建筑学院,山东青岛266590;2.西安建筑科技大学土木工程学院,陕西西安710055;3.西安理工大学土木建筑工程学院,陕西西安710048

摘要:

采取拉拔试验研究了环氧涂层钢筋与海水珊瑚混凝土间的黏结性能，分析了混凝土类型（普通混凝土、海水珊瑚混凝土）、混凝土强度等级（C25、C35）、锚固长度（48、90、128mm）、钢筋种类（普通钢筋、环氧涂层钢筋）及混凝土保护层厚度（67、42mm）对试件黏结强度与黏结滑移曲线的影响规律.结果表明：环氧涂层钢筋海水珊瑚混凝土试件的破坏模式主要为劈裂破坏,其黏结性能与普通钢筋混凝土试件有明显区别;海水珊瑚混凝土试件黏结强度高于普通混凝土试件,且黏结强度随混凝土强度等级和保护层厚度的增长而提高,随锚固长度的增长而降低,混凝土保护层厚度对黏结强度的影响最为明显;环氧涂层钢筋海水珊瑚混凝土试件的黏结滑移曲线可分为微滑移、滑移和下降3个阶段,钢筋种类和混凝土类型对曲线特征有明显影响.依据试验结果推导得到了环氧涂层钢筋海水珊瑚混凝土的黏结强度计算式,其计算值与实测值吻合良好,可用于实际工程.

关键词: 环氧涂层钢筋海水珊瑚混凝土黏结强度黏结滑移曲线破坏模式

DOI：103969/j.issn.1007 9629202005013

分类号:

基金项目:国家自然科学基金资助项目(51978389,51408346)；中国博士后特别资助项目(2016T0041)

Bond Properties of Epoxy Coated Reinforcement to Seawater Coral Concrete

HUANG Yijie¹, LI Xiaowei¹, ZHAN Xicheng², MA Hui³

1.College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China;2.College of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, China;3.School of Civil Engineering and Architecture, Xian University of Technology, Xian 710048, China

Abstract:

The bond properties of epoxy coated reinforcement(ER) to seawater coral concretes(SCC) was studied by the pull out test. The changes of bond strength and bond slip curve of specimens with different concrete types(ordinary concrete and SCC), strengths(C25,C35), anchorage lengths(48, 90, 128mm), reinforcement types(ordinary reinforcement and ER) and cover thickness(67,42mm) were obtained. Test results indicate that the bond strength of ER to SCC is different from that of ER to reinforced ordinary concrete. The failure pattern is split failure. The bond strength of SCC is higher than that of ordinary concrete, and it increases with the increase of concrete strength and cover thickness. However, the influence of anchorage length on bond strength is negative. It is shown that typical effect of cover thickness on bond strength is obvious. The bond slip curves of epoxy coated reinforced seawater coral concretes(ERSCC) are divided into micro slip, slip and declining stages. Types of reinforcement and concrete significantly influence the characteristics of bond slip curve. Finally, an analytical formula for calculating the bond strength of ERSCC is established. The calculated values are in line with the real ones, which can be used in the practical engineering.

Key words: epoxy coated reinforcement(ER) seawater coral concrete(SCC) bond strength bond slip curve failure mode