BFRP筋与珊瑚混凝土粘结性能试验研究
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摘要
为研究玄武岩纤维增强复合材料筋(BFRP筋)与珊瑚混凝土的粘结性能,对不同直径(d=8 mm、12 mm)、不同粘结长度(2.5 d、5.0 d与7.5 d)及不同养护环境(标准养护室养护、20±2℃人工海水养护)的共24个BFRP筋与珊瑚混凝土粘结锚固试件进行了中心拉拔试验。结果表明:除直径为12 mm,粘结长度为7.5 d的拉拔试件出现珊瑚混凝土劈裂破坏外,其余试件均为BFRP筋从珊瑚混凝土中拔出破坏,其破坏形态与BFRP筋和普通混凝土粘结破坏形态无明显区别,只是更易发生劈裂破坏。其粘结滑移曲线可分为微滑移阶段、滑移阶段、剥离阶段、下降阶段和残余阶段共5个阶段。其最大平均粘结应力随直径与粘结长度的增加显著减小。标准养护条件下的BFRP筋与珊瑚混凝土的粘结强度明显高于20±2℃人工海水养护下的粘结强度。
To study of the bond performance between BFRP bars and coral concrete, pull-out tests were carried out for 24 anchorage specimens with FRP bars of different diameters(d=8 mm and d=12 mm), different bonding lengths(2.5 d, 5.0 d and 7.5 d) and different curing conditions(standard curing room and artificial seawater immersion with the temperature of 20±2 ℃). The results show that all the specimens fail due to the pull-out of the BFRP bars from the concrete except the specimens with 12 mm diameter bars and a bonding length of 7.5 d, which is identified by splitting failure of the concrete. The failure mode is similar to that between BFRP bars and ordinary concrete, but the splitting failure occurs more easily for the bond between BFRP bars and coral concrete. The bond-slip curve can be divided into five stages, i.e., micro slip stage, sliding stage, stripping stage, declining stage and residual stage. With the increase of the diameter and bond length, the maximum average bond stress decreases markedly. Moreover, the bond strength of the specimens under standard curing conditions is apparently larger than that of specimens immersed in 20±2 ℃ artificial seawater.
To study of the bond performance between BFRP bars and coral concrete, pull-out tests were carried out for 24 anchorage specimens with FRP bars of different diameters(d=8 mm and d=12 mm), different bonding lengths(2.5 d, 5.0 d and 7.5 d) and different curing conditions(standard curing room and artificial seawater immersion with the temperature of 20±2 ℃). The results show that all the specimens fail due to the pull-out of the BFRP bars from the concrete except the specimens with 12 mm diameter bars and a bonding length of 7.5 d, which is identified by splitting failure of the concrete. The failure mode is similar to that between BFRP bars and ordinary concrete, but the splitting failure occurs more easily for the bond between BFRP bars and coral concrete. The bond-slip curve can be divided into five stages, i.e., micro slip stage, sliding stage, stripping stage, declining stage and residual stage. With the increase of the diameter and bond length, the maximum average bond stress decreases markedly. Moreover, the bond strength of the specimens under standard curing conditions is apparently larger than that of specimens immersed in 20±2 ℃ artificial seawater.
引文
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[3]靡人杰,余红发,麻海燕,等.全珊瑚骨料海水混凝土力学性能试验研究[J].海洋工程,2016,34(4):47―54.Mi Renjie,Yu Hongfa,Ma Haiyan et al.Study on the mechanical property of coral concrete[J].The Ocean Enginering,2016,34(4):47―54.(in Chinese)
[4]Rick A E.Coral concrete at bikini atoll[J].Concrete International,1991,1:19―24.
[5]胡乔,阳涛,王壮志,等.FRP海水珊瑚混凝土与普通钢筋混凝土结构的全寿命周期成本比较[J].建筑经济,2016,37(1):61―66.Hu Qiao,Yang Tao,Wang Zhuangzhi,et al.Analysis of life cycle cost frp marine coral concrete structure and common reinforced concrete structure[J].Construction Economy,2016,37(1):61―66.(in Chinese)
[6]李彪,侯慕秩,杨勇新,等.复材筋珊瑚骨料混凝土梁抗弯性能试验研究[J].工业建筑,2016,46(11):181―184.Li Biao,Hou Mutie,Yang Yongxin,et al.experiment study on the flexural behavior of coral aggregate concrete beam with frp[J].Industrial Construction,2016,46(11):181―184.(in Chinese)
[7]王磊,吴翔,曾榕,等.CFRP筋与珊瑚混凝土的黏结性能试验研究[J].中国农村水利水电,2016,7:127―131.Wang Lei,Wu Xiang,Zeng Rong,et al.Experimental research on bond performance between CFRP bars and the coral concrete[J].China Rural and Water Hydropower,2016,7:127―131.(in Chinese)
[8]Militky J,Kovacic V,Rubnerova.Influence of thermal treatment on tensile failure of basalt fibers[J].Engineering Fracture Mechanics,2002,69:1025―1033.
[9]Palmieri A,Matthys S,Tierens M.Basalt fibers mechanical properties and applications for concrete structures[C].London:Concrete Solutions:Proceedings of the International Conference on Concrete Solutions,2009:165―169.
[10]Wu Z S,Wang X,Iwashita K,Sasaki T,et al.Tensile fatigue behavior of FRP and hybrid FRP sheets[J],Composites Part B:Engineering,2010,41(5):396―402.
[11]郭恒宁,张继文.FRP筋混凝土粘结滑移模型的研究和试验分析[J].玻璃钢/复合材料,2007,2:21―24.Guo Hengning,Zhang Jiwen.study and expermental analysis of constitutne relation models for bondding and sliding between FRP tendons and concrete[J].FRP/CM,2007,2:21―24.(in Chinese)
[12]薛伟辰,刘华杰,王晓辉.新型FRP筋粘结性能研究[J].建筑结构学报,2004,25(2):104―109.Xue Weichen,Liu Huajie,Wang Xiaohui.Studies on bond properties of new-type FRP bars[J].Journal of Building Structures,2004,25(2):104―109.(in Chinese)
[13]Ahmed EI Refai,Mohamed-Amine Ammar,Radhouane Masmoudi.Bond performance of basalt fiber-reinforced polymer bars to concrete[J].Journal of Composites for Construction,2015,19(3):1―12.
[14]Benmokrane B,Tighiouart B,Chaallal O.Bond strength and load distribution of composite GFRP reinforcing bars in concrete[J].Journal of the American Concrete Institute,1996,93(3):246―253.
[15]Cosenza E,Manfredi G,Realtonzo R.Behavior and modeling of bond of FRP rebars to concrete[J].Compos.Constr.1997,12(40):40―51.
[16]Tighiouart B,Benmokrane B,Gao D.Investigation of concrete member with fiber reinforced polymer(FRP)bars[J].Constr.Build.Mater.,1998,12(8):453―462.
[17]Achillides Z,Pilakoutas K.Bond behavior of fiber reinforced polymer bars under direct pullout conditions[J].Journal of Composites for Construction,2004,8:2(173):173―181.
[18]郝庆多,王言磊,侯吉林,等.GFRP带肋筋粘结性能试验研究[J].工程力学,2008,25(10):158―165.Hao Qingduo,Wang Yanlei,Hou Jilin,et al.Experiment study on bond behavior of GFRP ribbed rebars[J].Engineering Mechanics,2008,25(10):158―165.(in Chinese)
[19]Arias J P M,Vazquez A,Escobar M.Use of sand coating to improve bonding between GFRP bars and concrete[J].Journal of Composites for Construction,2012,46(18):2271―2278.
[20]Sayed A F,Foret G,Le Roy R.Bond between carbon fiber-reinforced polymer(CFRP)bars and ultra high performance fiber reinforced concrete(UHPFRC):Experimental study[J].Construction and Building Materials,2011,25(2):479―485.
[21]Dong Z Q,Wu G,Xu B,et al.Bond durability of BFRP bars embedded in concrete under seawater conditions and the long-term bond strength prediction[J].Material and Design,2016,92:552―562.
[22]Ahmed EI Refai,Farid Abed.Bond durability of basalt fiber-reinforced polymer bar embedded in concrete under direct pullout conditions[J].Journal of Composites for Construction,2015,19(5):1―11.
[23]ASTM,Standard practice for the preparation of substitute ocean water,D1141-98[S].ASTM International,West Conshohocken,PA,2008.