超高韧性水泥基复合材料与锈蚀钢筋的梁式黏结试验研究
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摘要
采用超高韧性水泥基复合材料(UHTCC)能够有效提升水工结构构件的抗氯盐侵蚀能力。然而,在长期氯盐环境侵蚀作用下,结构内部钢筋仍然可能遭受一定程度锈蚀,进而可能影响钢筋与基体材料的黏结性能。本文通过梁式界面黏结试验,对比研究锈蚀对钢筋与UHTCC、混凝土间界面黏结性能的影响。试验结果表明,与混凝土对比试件不同,UHTCC试件均呈现出延性的拔出破坏模式,以及完整的黏结滑移全曲线。在试验的锈蚀范围内,UHTCC试件并未发生锈胀开裂,而且UHTCC中的钢筋锈蚀较混凝土中更为均匀。UHTCC试件的黏结强度随锈蚀率先增大后降低,在14%锈蚀范围内黏结强度基本没有下降,锈蚀率约16%时强度仅下降5%。在16%锈蚀范围内,UHTCC试件的黏结韧性下降仅为5%。
The use of ultra-high toughness cementitious composite(UHTCC) can improve the corrosion resistance of hydraulic structures effectively. However, the rebar in structural members may be subjected tocorrosion to a certain extent under long-term chloride environment attack, possibly resulting in deterioratedbond performance of UHTCC and rebar. In the present paper, the effect of corrosion on bond behavior ofUHTCC and rebar is investigated through bond tests using beam members. The experimental results indicat-ed that compared with concrete specimens, UHTCC specimens all presented ductile pull-out failure modeand full bond-slip curves. UHTCC samples all had no corrosion cracks in the range of corrosion level ob-tained in this test,and the rebar corrosion was relatively uniform. The bond strength of UHTCC specimensfirst increased and then decreased with increasing corrosion ratio. In detail, bond strength scarcely reducedat corrosion ratio below about 14%, and decreased by 5% at about 16% corrosion ratio. Meanwhile, thebond toughness merely reduced by about 5% with in tested corrosion level of 16%.
The use of ultra-high toughness cementitious composite(UHTCC) can improve the corrosion resistance of hydraulic structures effectively. However, the rebar in structural members may be subjected tocorrosion to a certain extent under long-term chloride environment attack, possibly resulting in deterioratedbond performance of UHTCC and rebar. In the present paper, the effect of corrosion on bond behavior ofUHTCC and rebar is investigated through bond tests using beam members. The experimental results indicat-ed that compared with concrete specimens, UHTCC specimens all presented ductile pull-out failure modeand full bond-slip curves. UHTCC samples all had no corrosion cracks in the range of corrosion level ob-tained in this test,and the rebar corrosion was relatively uniform. The bond strength of UHTCC specimensfirst increased and then decreased with increasing corrosion ratio. In detail, bond strength scarcely reducedat corrosion ratio below about 14%, and decreased by 5% at about 16% corrosion ratio. Meanwhile, thebond toughness merely reduced by about 5% with in tested corrosion level of 16%.
引文
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[13]FANG C,LUNDGREN K,PLOS M,et al.Bond behaviour of corroded reinforcing steel bars in concrete[J].Cement and Concrete Research,2006,36(10):1931-1938.
[14]徐世烺,蔡新华.超高韧性水泥基复合材料取代保护层混凝土梁抗锈蚀性能研究[J].土木工程学报,2011,44(5):79-85.
[15]HOU L J,LIU H,XU S,et al.Effect of corrosion on bond behaviors of rebar embedded in ultra-high toughness cementitious composite[J].Construction and Building Materials,2017,138:141-150.
[16]GB50010-2010,混凝土结构设计规范[S].北京:中国建筑工业出版社,2011.
[17]GB/T50082-2009,普通混凝土长期性能和耐久性能试验方法标准[S].北京:中国建筑工业出版社,2009.
[18]LEE S W,KANG S B,TAN K H,et al.Experimental and analytical investigation on bond-slip behaviour of deformed bars embedded in engineered cementitious composites[J].Construction and Building Materials,2016,127:494-503.
[19]XU F,WU Z,ZHENG J,HU Y,et al.Experimental study on the bond behavior of reinforcing bars embedded in concrete subjected to lateral pressure[J].Journal of Materials in Civil Engineering,2012,24(1):125-133.
[20]ASTMC1609.Standard Test Method for Flexural Performance of Fiber-reinforced Concrete[S].Philadelphia,USA:ASTM International,2005.
[2]丁一宁,任县伟,李冬.结构型钢纤维对混凝土单裂缝渗透特性的影响[J].水利学报,2017,48(1):13-20.
[3]徐世烺,蔡向荣.超高韧性纤维增强水泥基复合材料基本力学性能[J].水利学报,2009,40(9):1055-1063.
[4]LI V C,WANG S,WU C.Tensile strain-hardening behavior of PVA-ECC[J].ACI Materials Journal,2001,98(6):483-492.
[5]HOU L J,XU S L,ZHANG X F,et al.Shear behaviors of reinforced ultrahigh toughness cementitious composite slender beams with stirrups[J].Journal of Materials in Civil Engineering,2014,26(3):466-475.
[6]AHMED S F U,MIHASHI H.A review on durability properties of strain hardening fibre reinforced cementitious composites(SHFRCC)[J].Cement and Concrete Composites,2007,29(5):365-376.
[7]ZHANG Z G,QIAN S Z,MA H.Investigating mechanical properties and self-healing behavior of micro-cracked ECC with different volume of fly ash[J].Construction and Building Materials,2014,52:17-23.
[8]张君,公成旭,居贤春.高韧性低收缩纤维增强水泥基复合材料特性及应用[J].水利学报,2011,42(12):1452-1461.
[9]徐世烺,刘志凤.超高韧性水泥基复合材料干缩性能及其对抗裂能力的影响[J].水利学报,2010,41(12):1491-1496.
[10]KOBAAYASHI K,ROKUGO K.Mechanical performance of corroded RC member repaired by HPFRCC patching[J].Construction and Building Materials,2013,39:139-147.
[11]蔡新华,徐世烺,尹世平,等.超高韧性水泥基复合材料与锈蚀钢筋粘结性能试验研究[J].中国腐蚀与防护学报,2012,32(3):228-234.
[12]AUYEUNG Y B,BALAGURNU P,CHUNG L.Bond behavior of corroded reinforcement bars[J].ACI Materials Journal,2000,97(2):214-220.
[13]FANG C,LUNDGREN K,PLOS M,et al.Bond behaviour of corroded reinforcing steel bars in concrete[J].Cement and Concrete Research,2006,36(10):1931-1938.
[14]徐世烺,蔡新华.超高韧性水泥基复合材料取代保护层混凝土梁抗锈蚀性能研究[J].土木工程学报,2011,44(5):79-85.
[15]HOU L J,LIU H,XU S,et al.Effect of corrosion on bond behaviors of rebar embedded in ultra-high toughness cementitious composite[J].Construction and Building Materials,2017,138:141-150.
[16]GB50010-2010,混凝土结构设计规范[S].北京:中国建筑工业出版社,2011.
[17]GB/T50082-2009,普通混凝土长期性能和耐久性能试验方法标准[S].北京:中国建筑工业出版社,2009.
[18]LEE S W,KANG S B,TAN K H,et al.Experimental and analytical investigation on bond-slip behaviour of deformed bars embedded in engineered cementitious composites[J].Construction and Building Materials,2016,127:494-503.
[19]XU F,WU Z,ZHENG J,HU Y,et al.Experimental study on the bond behavior of reinforcing bars embedded in concrete subjected to lateral pressure[J].Journal of Materials in Civil Engineering,2012,24(1):125-133.
[20]ASTMC1609.Standard Test Method for Flexural Performance of Fiber-reinforced Concrete[S].Philadelphia,USA:ASTM International,2005.