冻融循环作用下嵌入式BFRP筋与混凝土粘结性能研究

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (8): 70-75.

冻融循环作用下嵌入式BFRP筋与混凝土粘结性能研究

金亮亮, 杨树桐^*

中国海洋大学工程学院,青岛266100

收稿日期:2019-11-11 出版日期:2020-08-28 发布日期:2020-08-28
通讯作者: 杨树桐(1979-),男,博士,教授,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:金亮亮(1993-),男,硕士,主要从事嵌入式加固混凝土耐久性试验方面的研究。
基金资助:
国家自然科学基金项目(51378481)

EXPERIMENTAL STUDY OF BOND BETWEEN NEAR-SURFACE MOUNTED BFRP BARS AND CONCRETE UNDER FREEZE-THAWING CYCLES

JIN Liang-liang, YANG Shu-tong^*

College of Engineering Ocean University of China, Qingdao 26600, China

Received:2019-11-11 Online:2020-08-28 Published:2020-08-28

摘要/Abstract

摘要： 为探究高寒地区冻融循环作用对嵌入式FRP加固混凝土界面粘结耐久性能的影响,针对玄武岩纤维增强复合材料(BFRP)筋嵌入式加固混凝土结构,通过采用环氧树脂胶(EP)和高韧性纤维增强水泥基复合材料(ECC)作为粘结材料的嵌入式FRP筋-从混凝土中拉拔试验,分析冻融循环作用下嵌入式FRP-混凝土相邻层之间的破坏模式和粘结退化机理,研究冻融循环次数、粘结材料、混凝土基体性能对粘结性能的影响。结果表明:不同侵蚀条件下试件破坏模式基本表现为胶基体与混凝土剪切破坏、胶基体劈裂破坏、毗邻混凝土-胶界面混凝土薄层剪切破坏、ECC基体与混凝土剪切破坏、FRP与ECC界面粘结破坏五种破坏模式,试件的极限粘结承载力随着循环次数的增加而呈不同程度的下降,50次循环内对试件粘结性能的影响较小,ECC试件相比环氧树脂胶试件,粘结承载力低,但表现出良好的延性。

关键词: 冻融循环, 嵌入式加固, BFRP筋, 粘结性能, 高韧性纤维增强水泥基复合材料

Abstract: Alpine areas to explore the effect of freeze-thaw cycles on the embedded FRP reinforcement concrete interface bonding durability, in view of the basalt fiber reinforced composite material (BFRP) tendons embedded reinforcement concrete structure, using epoxy resin (EP) and high toughness of fiber reinforced cement matrix composites (ECC) as the bonding material embedded FRP reinforcement-pull-out tests, from the concrete analysis under the action of freeze-thaw cycle embedded FRP and concrete interface failure mode and the bonding mechanism of degradation, the freezing and thawing cycles, bonding materials, concrete substrate effect on the properties of adhesive performance, the results showed that: Basic performance under the condition of different erosion specimen failure mode for the rubber matrix and shear failure of concrete, rubber matrix fracturing, adjacent to the concrete-concrete thin layer of adhesive interface shear failure, ECC matrix and shear failure of concrete, FRP and ECC interface bond destruction of five kinds of failure modes, the ultimate bond bearing capacity of the specimen increased with the increase of cycling times show varying degrees of decline, within fifty loops on the cohesive force of specimen is small, the influence of ECC specimen compared to epoxy resin adhesive specimen, caking capacity below the epoxy resin specimens, but showed good ductility.

Key words: freeze-thawing, near-surface mounted, BFRP bars, bond performance, high performance fiber reinforced cementitious composite

中图分类号:

TB332

金亮亮, 杨树桐. 冻融循环作用下嵌入式BFRP筋与混凝土粘结性能研究[J]. 复合材料科学与工程, 2020, 0(8): 70-75.

JIN Liang-liang, YANG Shu-tong. EXPERIMENTAL STUDY OF BOND BETWEEN NEAR-SURFACE MOUNTED BFRP BARS AND CONCRETE UNDER FREEZE-THAWING CYCLES[J]. Composites Science and Engineering, 2020, 0(8): 70-75.

参考文献

[1] 叶列平, 冯鹏. FRP在工程结构中的应用与发展[J]. 土木工程学报, 2006, 39(3): 24-36.
[2] 岳清瑞, 李庆伟, 杨勇新. 纤维增强复合材料嵌入式加固[J]. 工业建筑, 2004, 34(4): 1-4.
[3] AI-MAHMOUD F, MECHLING J M, SHABAN M. Bond strength of different strengthening systems-concrete elements under freeze-thaw cycles and salt water immersion exposure[J]. Construction and Building Materials, 2014, 70: 399-409.
[4] 李荣, 腾锦光, 岳清瑞. FRP材料加固混凝土结构应用的新领域: 嵌入式(NSM)加固法[J]. 工业建筑, 2004, 34(4): 5-10.
[5] 杨树桐, 刘界鑫. 不同粘结材料条件下嵌入式FRP筋与混凝土粘结性能试验研究[C]//第九届全国建设工程FRP应用学术交流会论文集. 中国土木工程学会FRP及工程应用专业委员会, 2015: 6.
[6] 姚国文, 杨凌飞, 李世亚. 环境/荷载作用下粘结FRP加固混凝土桥梁耐久性研究[C]//第九届全国建设工程FRP应用学术交流会论文集. 中国土木工程学会FRP及工程应用专业委员会, 2015: 6.
[7] 巩家宗, 杨树桐, 刘洋. 氯盐干湿循环作用下嵌入式CFRP筋与混凝土界面粘结性能研究[J]. 玻璃钢/复合材料, 2018(4): 11-14.
[8] 任慧韬, 胡安妮, 赵国藩. 纤维增强塑料与混凝土黏结抗冻融性能研究[J]. 大连理工大学学报: 自然科学版, 2003, 43(4): 495-499.
[9] GREEN M F, BISBY L A, BEAUDOIN Y, et al. Effect of freeze-thaw cycles on the bond durability between fiber rein-forced polymer plate reinforcement and concrete[J]. Canadian Journal of Civil Engineering, 2000, 27(5): 949-959.
[10] SHI J W, ZHU H, WU Z H, et al. Bond behavior between basalt fiber reinforced polymer sheet and concrete substrate under the coupled effects of freeze-thaw cycling and sustained load[J]. Journal of Composites for Construction, 2013, 17(4): 530-542.
[11] SUBRAMANIAM K V, ALI-AHMAD M, GHOSN M. Freeze-thaw degradation of FRP-concrete interface:Impact on cohesive fracture response[J]. Engineering Fracture Mechanics, 2008(75): 3924-3940.
[12] QIAO P Z, XU Y. Effects of freeze-thaw and dry-wet conditionings on the Mode-Ⅰfracture of FRP-concrete interface bonds[C]//Pro-ceedings of Ninth Biennial conference on Engineering Environments. Houston. Texas: American Society of Civil Engineers, 2004: 601-608.
[13] 李贺东. 超高韧性水泥基复合材料试验研究[D]. 大连: 大连理工大学, 2008.
[14] 徐世烺, 蔡新华, 李贺东. 超高韧性水泥基复合材料抗冻耐久性能试验研究[J]. 土木工程学报, 2009, 42(9): 42-46.
[15] 普通混凝土长期性能和耐久性能试验方法标准: GB/T 50082—2009[S]. 北京: 中国建筑工业出版社, 2009.
[16] 张新越, 欧进萍. FRP筋酸碱盐介质腐蚀与冻融耐久性试验研究[J]. 武汉理工大学学报, 2007, 29(1): 34-36.
[17] UOMOTO T, MUTSUYOSHI H, KATSUKI F, et al. Use of fiber-reinforced polymer composites as reinforcing material for concrete[J]. Materials in Civil Engineering, 2002, 14(3): 191-209.
[18] 王海良, 吴振. 酸溶液、冻融循环及其耦合作用下玄武岩纤维筋耐久性试验[J]. 防灾减灾工程学报, 2008, 1(6): 39-46.
[19] 杨树桐. 基于断裂力学的钢筋、FRP与混凝土界面力学特性研究[D]. 大连: 大连理工大学, 2008: 7-8.