弯拉荷载作用下UHTCC抗碳化性能研究
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摘要
为探究超高韧性水泥基复合材料(Ultra High Tough-ness Cementitious Composites,简称UHTCC)受弯拉荷载作用下的抗碳化性能,通过快速碳化试验研究了UHTCC试件在不同碳化龄期下、不同水灰比条件(0.26、0.30)下、不同荷载率(30%和60%)下及不同弯矩位置的抗碳化性能。试验结果表明,随着碳化龄期的增长试件碳化深度逐渐增大;水灰比越大UHTCC的抗碳化性能越弱,水灰比为0.26、0.30的试件在30%荷载率下碳化28 d的深度分别为3.95 mm、7.43 mm。弯拉荷载加速了UHTCC试件的碳化进程,碳化深度随着荷载率的增大而增大,当荷载率由0增加至30%时的碳化深度增值小于荷载率由30%增加至60%时的碳化深度增值。碳化对受弯构件各弯矩位置产生不同的影响,碳化深度随着弯矩的增大呈对数形式不断增大。
In order to explore the anti-carbonization performance of the ultrahigh toughness cementitious composites( UHTCC) under flexural loading. Based on the accelerated carbonization testing,the effects of carbonization time,w/c( 0. 26 and 0. 30),flexural loading rate( 30% and 60%) and bending moment on carbonation resistance of UHTCC were studied. The results show that with the carbonation age increases,the carbonation depth of UHTCC increases gradually. The greater is the w/c ratio,the weaker is the carbonation resistance of UHTCC. The carbonation depth of the specimen with 0. 26 and 0. 30 w/c is 3. 95 mm and 7. 43 mm at 30% loading rate. The flexural loading accelerated the carbonization rate of UHTCC,and the carbonation depth increases with the increase of loading rate. The increased value of carbonation depth during the loading rate increases from 0 to 30% is less than that during the loading rate increases from 30% to 60%. Carbonation has a different effect on different positions of flexural specimen. Carbonation depth increases logarithmically as bending moment increases.
In order to explore the anti-carbonization performance of the ultrahigh toughness cementitious composites( UHTCC) under flexural loading. Based on the accelerated carbonization testing,the effects of carbonization time,w/c( 0. 26 and 0. 30),flexural loading rate( 30% and 60%) and bending moment on carbonation resistance of UHTCC were studied. The results show that with the carbonation age increases,the carbonation depth of UHTCC increases gradually. The greater is the w/c ratio,the weaker is the carbonation resistance of UHTCC. The carbonation depth of the specimen with 0. 26 and 0. 30 w/c is 3. 95 mm and 7. 43 mm at 30% loading rate. The flexural loading accelerated the carbonization rate of UHTCC,and the carbonation depth increases with the increase of loading rate. The increased value of carbonation depth during the loading rate increases from 0 to 30% is less than that during the loading rate increases from 30% to 60%. Carbonation has a different effect on different positions of flexural specimen. Carbonation depth increases logarithmically as bending moment increases.
引文
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[2]Xi Y P,Shing B,Abu-hejleh N,et al.Assessment of the cracking problem in newly constructed bridge decks in Colorado[R].Report No.CDOTDTD-R-2003-3,Submitted to Colorado DOT,2003.
[3]宋晓翠,赵铁军,蒋真.荷载作用对混凝土碳化性能的影响[J].工程建设,2009,41(1):1-2.
[4]陈树亮.混凝土碳化机理、影响因素及预测模型[J].华北水利水电学院学报,2010,31(3):35-36.
[5]曹明莉,丁言兵,郑进炫,等.混凝土碳化机理及预测模型研究进展[J].混凝土,2012(9):35-36.
[6]金祖权,孙伟,张云升,等.荷载作用下混凝土的碳化深度[J].建筑材料学报,2005,8(2):181-182.
[7]牛建刚,牛荻涛,刘万里.弯曲荷载影响粉煤灰混凝土碳化规律的研究[J].硅酸盐通报,2011,30(1):142-145.
[8]刘万里.弯曲荷载与环境共同作用下粉煤灰混凝土碳化规律的研究[D].西安:西安建筑科技大学,2008.
[9]高延红,周胜兵,王建东,等.弯曲荷载对水工混凝土构件碳化耐久性寿命的影响[J].中国农村水利水电,2011,6:108-109.
[10]罗小勇,邹洪波,施清亮.不同应力状态下混凝土碳化耐久性试验研究[J].自然灾害学报,2012,21(2):195-196.
[11]Li V C.高延性纤维增强水泥基复合材料的研究进展及应用[J].硅酸盐学报,2007,35(4):531-532
[12]Li V C.ECC-tailored composites through micromechanical modeling[A].Fiber Reinforced Concrete:Present and the Future edited by Banthiaet al,CSCE[C].Montreal,1998,64-97.
[13]Li V C.On engineered cementitious composites(ECC)-a review of the material and its applications[J].Adv.Concr.Technol.,2003,1(3):215-230.
[14]Li V C,Wang S,Wu C.Tensile strain-hardening behavior of PVA-ECC[J].ACI.Mater.J,2001,98(6):483-492.
[15]Lin Z,Kanda T,Li V C.On interface property characterization and performance of fiber reinforced cementitious composites[J].Concr.Sci.Eng,Rilem,1999(1):173-184.
[16]徐世烺,李贺东.超高韧性水泥基复合材料研究进展及其工程应用[J].土木工程学报,2008,41(6):53-56.
[17]徐世烺,蔡新华.超高韧性水泥基复合材料碳化与渗透性能试验研究[J].复合材料学报,2010,27(3):180-182.
[18]徐世烺,李贺东.超高韧性水泥基复合材料直接拉伸试验研究[J].土木工程学报,2009,42(9):39-40.
[19]Kazim T,Serhat D.Permeation properties of ECC containing lsp[C].International Conference on Structural Civil and Architectural Engineering,Montreal,Canada,2016:112-113.
[20]Kazim T,Serhat D.Effect of limestone powder on the rheological,mechanical and durability properties of ECC[J],European Journal of Environmental and Civil Engineering,2017,21(9):1165-1166.
[21]周伟.大掺量粉煤灰ECC耐久性试验研究[D].哈尔滨:哈尔滨工业大学,2010.
[22]蔡新华.超高韧性水泥基复合材料耐久性能试验研究[D].大连:大连理工大学,2009.