硫酸盐环境下CFRP-混凝土界面黏结强度试验研究
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摘要
通过硫酸盐加速侵蚀试验模拟硫酸盐侵蚀环境,采用双剪试件对硫酸盐侵蚀环境下CFRP-混凝土界面性能(界面黏结强度、断裂能及有效黏结长度)随侵蚀时间的退化规律进行试验研究。试验结果表明,界面黏结强度和界面断裂能随着硫酸盐侵蚀时间的增加均有所下降,而界面有效黏结长度有所增加。通过对试验结果的统计回归分析,给出了界面断裂能和有效黏结长度随硫酸盐侵蚀时间的关系表达式,建立了硫酸盐环境下CFRP-混凝土界面的黏结强度模型,预测模型能够很好的反映界面黏结强度随硫酸盐侵蚀时间的退化规律。
The sulfate erosion environment was simulated by sulfate accelerated erosion test.Double shear test piece was used to study the degradation law of the performance of CFRP-concrete interface(interfacial bond strength,fracture energy and effective bond length)under sulfate attack environment with erosion time.The experimental results show that the interface bond strength and interfacial fracture energy decrease with the increase of sulfate attack time,while the effective bond length of the interface increases.Based on the statistical regression analysis of the experimental results,the relational expression of the interface fracture energy and the effective bonding length with the sulfate corrosion time was given.The bonding strength model of CFRP-concrete interface in the sulfate environment was established The prediction model can well reflect the degeneration of the interfacial bonding strength with the corrosion time.
The sulfate erosion environment was simulated by sulfate accelerated erosion test.Double shear test piece was used to study the degradation law of the performance of CFRP-concrete interface(interfacial bond strength,fracture energy and effective bond length)under sulfate attack environment with erosion time.The experimental results show that the interface bond strength and interfacial fracture energy decrease with the increase of sulfate attack time,while the effective bond length of the interface increases.Based on the statistical regression analysis of the experimental results,the relational expression of the interface fracture energy and the effective bonding length with the sulfate corrosion time was given.The bonding strength model of CFRP-concrete interface in the sulfate environment was established The prediction model can well reflect the degeneration of the interfacial bonding strength with the corrosion time.
引文
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[2]陈绪军.FRP片材加固钢筋混凝土梁挠度计算方法研究[J].铁道学报,2017,39(11):103-107.CHEN Xujun.Study on Deflection Calculation Method for Reinforced Concrete Beams Strengthened with FRP Sheets[J].Journal of the China Railway Society,2017,39(11):103-107.
[3]任慧韬,姚谦峰,胡安妮.纤维增强复合材料的耐久性能试验研究[J].建筑材料学报,2005,8(5):520-526.REN Huitao,YAO Qianfeng,HU Anni.Experimental Study on Durability of Fiber Reinforced Polymer[J].Journal of Building Materials,2005,8(5):520-526.
[4]丁南宏,钱永久,林丽霞.CFRP加固混凝土墩柱温度自应力及参数研究[J].铁道学报,2007,29(1):127-131.DING Nanhong,QIAN Yongjiu,LIN Lixia.Study on Temperature Self-restrained Stress and Parameters of the Concrete Pier Column Strengthened by CFRP[J].Journal of the China Railway Society,2007,29(1):127-131.
[5]周长东,田腾,吕西林,等.预应力纤维条带加固震损混凝土圆墩抗震性能试验研究[J].铁道学报,2012,34(10):103-114.ZHOU Changdong,TIAN Teng,LXilin,et al.Test Study on Seismic Performance of Pre-damaged RC Cylinder Piers Strengthened with Pre-stressed FRP Belts[J].Journal of the China Railway Society,2012,34(10):103-114.
[6]ZHOU Y W,FAN Z H,DU J.Bond Behavior of FRP-toconcrete Interface under Sulfate Attack[J].Construction and Building Materials,2015,85:9-21.
[7]CHEN J F,TENG J G.Anchorage Strength Models for FRP and Steel Plates Bonded to Concrete[J].Journal of Structural Engineering,ASCE,2001,127(7):784-791.
[8]陆新征,叶列平,滕锦光,等.FRP-混凝土界面黏结滑移本构模型[J].建筑结构学报,2005,26(4):10-18.LU Xinzheng,YE Lieping,TENG Jinguang,et al.Bondslip Model for FRP-to-concrete Interface[J].Journal of Building Structures,2005,26(4):10-18.
[9]MAEDAT,ASANO Y,SATO Y,et al.A Study on Bond Mechanism of Carbon Fiber Sheet[C]//Proceedings of Third International Symposium on Non-Metallic(FRP)Reinforcement for Concrete Structures.Sapporo:Concrete Institute,1997:279-286.
[10]TANAKA T.Shear Resisting Mechanism of Reinforced Concrete Beams with CFS as Shear Reinforcement[D].Japan:Hokkaido University,1996.
[11]任慧韬.纤维增强复合材料加固混凝土结构基本力学性能和长期受力性能研究[D].大连:大连理工大学,2003.
[12]杨勇新,岳清瑞,胡云昌.碳纤维布与混凝土黏结性能的试验研究[J].建筑结构学报,2001,22(3):36-42.YANG Yongxin,YUE Qingrui,HU Yunchang.Experimental Study on Bond Performance between Carbon Fiber Sheets and Concrete[J].Journal of Building Structures,2001,22(3):36-42.
[13]刘生纬.硫酸盐环境下CFRP-混凝土界面黏结性能退化规律及劣化机理研究[D].兰州:兰州交通大学,2018.
[14]王复生,孙瑞莲,秦晓娟.察尔汗盐湖条件下水泥混凝土耐久性调查研究[J].硅酸盐通报,2002,4(4):16-22,35.WANG Fusheng,SUN Ruilian,QIN Xiaojuan.The Investigation of Concrete Durability under Natural Condition of Ca Er Han Salt Lake[J].Bulletin of The Chinese Ceramic Society,2002,4(4):16-22,35.
[15]余红发.盐湖地区高性能混凝土的耐久性、机理与使用寿命预测方法[D].南京:东南大学,2004.
[16]王起才.南疆铁路桥梁工程混凝土抗侵蚀试验研究[J].兰州铁道学院学报,1997,16(4):28-31.WANG Qicai.Experimental Study of the Corrosion-resistance of Concrete Bridge on Nanjiang Railway[J].Journal of Lanzhou Railway Institute,1997,16(4):28-31.
[17]WU Z S,IWASHITA K,YAGASHIRO S,et al.Temperature Effect on Bonding and Debonding Behavior between FRP Sheets and Concrete[J].Journal of the Society of Materials Science Japan,2005,54(5):474-475.
[18]TOMMASO A D,NEUBAUER U,PANTUSO A,et al.Behavior of Adhesively Bonded Concrete-CFRP Joints at Low and High Temperatures[J].Mechanics of Composite Materials,2001,37(4):327-332.
[19]SILVA M A,BISCAIA H.Degradation of Boned between FRP and RC Beams[J].Composite Structures,2008,85(2):164-171.
[20]DETASSIS M,FRYDMAN E,VRIELING D,et al.Interface Toughness in Fiber Composites by the Fragmentation Test[J].Composites Part A:Applied Science and Manufacturing,1996,27(9):769-773.
[21]易楠,顾轶卓,李敏,等.碳纤维复合材料界面结构的形貌与尺寸的表征[J].复合材料学报,2010,27(5):36-40.YI Nan,GU Yizhuo,LI Min,et al.Characterization on Topography and Dimension of the Interphase Structure in Carbon Fiber Composites[J].Acta Materiae Compositae Sinica,2010,27(5):36-40.
[22]陆新征.FRP-混凝土界面行为研究[D].北京:清华大学,2004.
[23]YUAN H,TENG J G,SERACINO R,et al.Full-range Behavior of FRP-to-Concrete Bonded Joints[J].Engineering Structures,2004,26(5):553-565.
[24]NAKABA K,KANAKUBO T,FURUTA T,et al.Bond Behavior between Fiber-reinforced Polymer Laminates and Concrete[J].ACI Structural Journal,2001,98(3):1-9.
[25]YUN Y C,WU Y F.Durability of CFRP-concrete Joints under Freeze-thaw Cycling[J].Cold Regions Science and Technology,2011,65(3):401-412.
[26]Al-DULAIJAN S U.Sulfate Resistance of Plain and Blended Cements Exposed to Magnesium Sulfate Solutions[J].Construction and Materials,2007,21(8):1792-1802.