基于正交试验的UHTCC配合比设计
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摘要
利用正交试验设计了9组不同配合比的超高韧性水泥基复合材料,通过直拉与弯拉试验,研究了水胶比、粉煤灰掺量、纤维体积掺量对极限拉应力、拉应变、弯拉应力和跨中挠度的影响。结果表明:PVA纤维明显提高了UHTCC的抗拉性能及抗弯性能;纤维体积掺量对7 d极限拉应变和28 d极限拉应力、拉应变均有显著影响,极限拉应力、拉应变总体上随着纤维体积掺量的增大而增大,水胶比对7 d极限拉应变影响显著,粉煤灰掺量对极限拉应力、拉应变的影响较小;水胶比和纤维体积掺量对7 d极限弯拉应力均有显著影响,粉煤灰掺量和纤维体积掺量对28 d极限弯拉应力有显著影响,水胶比和纤维体积掺量对7 d极限跨中挠度影响极其显著,对28 d极限跨中挠度有一定影响;通过综合分析确定了既保证强度又具有高延性的UHTCC的最优配合比。
Nine groups of ultra-high toughness cementitious composites with different mix proportion were designed by orthogonal test method.Through direct tensile test and bend-pull test,the effects of water-binder ratio,fly ash content,fiber volume content on ultimate tensile stress,ultimate tensile strain,ultimate bending tensile stress and ultimate bending deflection were studied.The test results show that PVA fiber significantly improves the tensile and flexural properties of UHTCC.The fiber volume content has a significant effect on the tensile strength at 28 days,tensile strain at 7 days and tensile strain at 28 days.And it has a certain influence on the tensile stress for 7 days.Tensile stress and tensile strain generally increase as the fiber volume content increases.The water-binder ratio has a significant influence on the tensile strain at 7 days,and the influence of fly ash content on the tensile and tensile strains is small.Water-binder ratio and fiber volume content have a significant effect on 7 day bending stress,and fly ash content and fiber volume content have a significant effect on tensile stress at 28 days.The water-binder ratio and fiber volume content have extremely significant influence on the deflection of 7-day bending,which has a certain influence on the bending deflection of 28 days.Through comprehensive analysis,the optimal mix proportion of UHTCC that ensures both strength and high ductility is determined.
Nine groups of ultra-high toughness cementitious composites with different mix proportion were designed by orthogonal test method.Through direct tensile test and bend-pull test,the effects of water-binder ratio,fly ash content,fiber volume content on ultimate tensile stress,ultimate tensile strain,ultimate bending tensile stress and ultimate bending deflection were studied.The test results show that PVA fiber significantly improves the tensile and flexural properties of UHTCC.The fiber volume content has a significant effect on the tensile strength at 28 days,tensile strain at 7 days and tensile strain at 28 days.And it has a certain influence on the tensile stress for 7 days.Tensile stress and tensile strain generally increase as the fiber volume content increases.The water-binder ratio has a significant influence on the tensile strain at 7 days,and the influence of fly ash content on the tensile and tensile strains is small.Water-binder ratio and fiber volume content have a significant effect on 7 day bending stress,and fly ash content and fiber volume content have a significant effect on tensile stress at 28 days.The water-binder ratio and fiber volume content have extremely significant influence on the deflection of 7-day bending,which has a certain influence on the bending deflection of 28 days.Through comprehensive analysis,the optimal mix proportion of UHTCC that ensures both strength and high ductility is determined.
引文
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[13]白亮,周枫,谢鹏飞,等.高延性纤维增强水泥基复合材料力学性能试验研究[J].工业建筑,2017,6(47):108-113.
[14]张径伟.纤维增韧水泥基复合材料的弯曲性能试验研究[J].混凝土,2012(9):25-29.
[15]杨英姿,姚燕.高性能PVA纤维增强水泥基材料的制备与性能[J].中国材料进展,2010,29(9):19-24.
[16]刘曙光,张栋翔,闫长旺,等.钙粉煤灰PVA-ECC拉伸性能试验研究[J].硅酸盐通报,2016,35(1):52-60.
[17]DENG M K,CHANG Y T,LIANG X W.Orthogonal test research on compressive strength size effect of ECC[J].Trans Tech Publications,2012:1789-1795.
[18]李雪阳,江世永,姚未来.高韧性水泥基复合材料拉伸试验与正交分析[J].后勤工程学院学报,2017,33(3):29-34.
[2]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):531-535.
[3]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.
[4]LIN Z,KANDA T,LI V C.On interface property characterization and performance of fiber reinforced cementitious composites[J].Concrete Science and Engineering,RILEM,1999(1):173-184.
[5]LI V C,WANG S X,WU C.Tensile strain-hardening behavior of polyvinyl alcohol engineered cementitious composite(PVA-ECC)[J].ACI Materials Journal,2001,98(6)483-492.
[6]李庆华,徐世烺.超高韧性复合材料控裂功能梯度复合梁弯曲性能试验研究[J].《中国科学》杂志社,2009,39(8):1391-1392.
[7]YANG E H,LI V C.Strain-rate effects on the tensile behavior of strain-hardening cementitious composites[J].Construction and Building Materials,2014(52):96-104.
[8]公成旭,张君.高韧性纤维增强水泥基复合材料的抗拉性能[J].水利学报,2008,39(3):361-366.
[9]蔡向荣.超高韧性水泥基复合材料基本力学性能和应变硬化过程理论分析[D].大连:大连理工大学,2009.
[10]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):33-34.
[11]林建辉,余江滔,LI V C.PVA纤维增强水泥基复合材料热处理后的力学性能[J].复合材料学报,2016,33(1):116-122.
[12]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.
[13]白亮,周枫,谢鹏飞,等.高延性纤维增强水泥基复合材料力学性能试验研究[J].工业建筑,2017,6(47):108-113.
[14]张径伟.纤维增韧水泥基复合材料的弯曲性能试验研究[J].混凝土,2012(9):25-29.
[15]杨英姿,姚燕.高性能PVA纤维增强水泥基材料的制备与性能[J].中国材料进展,2010,29(9):19-24.
[16]刘曙光,张栋翔,闫长旺,等.钙粉煤灰PVA-ECC拉伸性能试验研究[J].硅酸盐通报,2016,35(1):52-60.
[17]DENG M K,CHANG Y T,LIANG X W.Orthogonal test research on compressive strength size effect of ECC[J].Trans Tech Publications,2012:1789-1795.
[18]李雪阳,江世永,姚未来.高韧性水泥基复合材料拉伸试验与正交分析[J].后勤工程学院学报,2017,33(3):29-34.