海洋环境下BFRP筋与珊瑚混凝土粘结性能的试验研究

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (12): 43-53.

海洋环境下BFRP筋与珊瑚混凝土粘结性能的试验研究

高傲¹, 杨树桐^1*, 高广希², 王秀英³

1.中国海洋大学工程学院,青岛266100;
2.青岛市崂山区建设工程管理中心,青岛266100;
3.青岛筑华环保科技有限公司,青岛266100

收稿日期:2020-01-16 发布日期:2020-12-30
通讯作者: 杨树桐(1979-),男,博士,教授,博士生导师,主要从事混凝土断裂力学、混凝土加固与锚固的理论与试验方面的研究,shutongyang2013@163.com。
作者简介:高傲(1994-),女,硕士,主要从事FRP珊瑚混凝土粘结性能试验方面的研究。
基金资助:
国家自然科学基金项目-FRP筋海水珊瑚骨料混凝土力学性能与耐久性能研究(51778591)

EXPERIMENTAL STUDY ON THE BOND PERFORMANCE BETWEEN BFRP BARS AND CARAL CONCRETE IN MARINE ENVIRONMENT

GAO Ao¹, YANG Shu-tong^1*, GAO Guang-xi², WANG Xiu-ying³

1. College of Engineering, Ocean University of China, Qingdao 266100, China;
2. Qingdao Laoshan District Construction Engineering Management Center, Qingdao 266100, China;
3. Qingdao Zhuhua Environmental Protection Technology Co., Ltd., Qingdao 266100, China

Received:2020-01-16 Published:2020-12-30

摘要/Abstract

摘要： 本文针对不同海洋养护环境(海水潮汐区和海水水下区)、不同粘结长度(2.5d、5.0d、7.5d)、不同筋材直径(d=8 mm、d=10 mm)、不同海水养护龄期(30 d、60 d、90 d)条件,研究了海水珊瑚混凝土基本力学性能的测定及其与BFRP筋(玄武岩纤维增强复合材料筋)的粘结性能。结果表明:随着养护龄期的增长,珊瑚混凝土的立方体抗压强度、轴心抗压强度、抗折强度和弹性模量呈现先上升后下降的趋势。2.5d和5.0d粘结长度的试件破坏模式表现为筋拔出破坏,粘结长度为7.5d的试件破坏模式主要表现为珊瑚混凝土劈裂破坏、筋劈裂破坏。粘结滑移曲线大致可分为微滑移阶段、滑移阶段、剥离阶段、下降阶段、残余阶段共五个阶段。相同工况下,最大平均粘结应力随粘结长度和直径的增大而减小,残余粘结应力随粘结长度的增大而增大,浸泡区最大平均粘结应力高于潮汐区最大平均粘结应力。伴随着养护龄期的增长,直径为8 mm的试件的最大平均粘结应力值表现为缓慢增长,直径为12 mm的呈先增大后减小的趋势,海水浸泡环境下残余粘结应力呈先上升后下降的趋势,海水潮汐环境下呈现逐渐下降的趋势。

关键词: BFRP筋, 珊瑚混凝土, 海洋环境, 粘结性能, 破坏模式, 直径, 养护龄期, 养护环境, 复合材料

Abstract: Experiments were carried out to study the basic mechanical property of seawater coral concrete and the bond performance between coral concrete and BFRP bars under different marine curing environment (tidal zone immersion and seawater immersion), different bonding lengths (2.5d, 5.0d and 7.5d), different diameters (d=8 mm and d=12 mm), and different curing periods (30 d, 60 d and 90 d). The test results show that the compressive strength, axial compressive strength, flexural strength and elastic modulus of coral concrete show a trend of increase first and then decrease with the increase of the curing age, the specimens with a bond length of 2.5d and 5d fail due to the pull-out of the BFRP bars from the concrete, while the specimens with a bond length of 7.5d fail due to the split of the coral concrete or the BFRP bar. The bond-slip curve can be divided into five stages, which include micro slip stage, sliding stage, stripping stage, declining stage and residual stage. Under the same condition, the maximum average bond stress decreases with the increase of the bond length and the diameter, while the residual bond stress decreases with the increase of bond length, the maximum average bond stress in seawater zone is higher than that in tidal zone. With the growth of the curing age, the maximum average bond stress value of the specimens for diameter of 8 mm show an upward trend, and that of the specimens for diameter of 12 mm show a trend of increasing first and then decreasing. The residual bond stress in the seawater immersion environment shows a trend of increasing first and then decreasing, and it shows a trend of decreasing gradually in the seawater tidal environment.

Key words: BFRP bar, coral concrete, marine environment, bond performance, failure mode, diameter, curing period, curing environment, composites

中图分类号:

TB332

高傲, 杨树桐, 高广希, 王秀英. 海洋环境下BFRP筋与珊瑚混凝土粘结性能的试验研究[J]. 复合材料科学与工程, 2020, 0(12): 43-53.

GAO Ao, YANG Shu-tong, GAO Guang-xi, WANG Xiu-ying. EXPERIMENTAL STUDY ON THE BOND PERFORMANCE BETWEEN BFRP BARS AND CARAL CONCRETE IN MARINE ENVIRONMENT[J]. COMPOSITES SCIENCE AND ENGINEERING, 2020, 0(12): 43-53.

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