多元复合材料改性耐盐冻修补砂浆性能研究
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摘要
采用正交试验,以早期抗压强度和200次盐冻循环后的质量损失率为评定标准,确定了复合材料的最优配合比,并开展最优配合比下的复合材料对耐盐冻修补砂浆的力学性能、黏结强度、干燥收缩、盐冻性能及SEM的影响研究。结果表明:复合材料的最优配合比Power-D为0.6%,可再分散乳胶粉为2.5%,引起剂为0.01%,R-CSA为8.0%;最优配合比下的复合材料能够提高修补砂浆的抗压强度,降低干燥收缩,300次盐冻循环后的质量损失仅为4.3%、4.5%,28 d水化产物更致密。
By orthogonal experiment,in early compressive strength and 200 times of circulation after the mass loss as the evaluation standard,to determine the optimal mixture ratio of composite materials,and confirm the optimal mixing proportion of composite material of salt-tolerant frozen repair mortar bond strength,drying shrinkage,mechanical properties,the influence of salt frost resistance and SEM studies.The experimental results show that the optimum mixture ratio of the composite material was that the Power-D was 0.6%,the dispersed emulsion powder was 2.5%,the causing agent is 0.01%,the R-CSA is 8.0%.Under the optimal ratio of composite material can improve the compressive strength of repair mortar,reduce drying shrinkage,and the 300 times of salt freezing circulation of the mass loss is only 4.3% and 4.5%,the 28 d hydration products was more dense.
By orthogonal experiment,in early compressive strength and 200 times of circulation after the mass loss as the evaluation standard,to determine the optimal mixture ratio of composite materials,and confirm the optimal mixing proportion of composite material of salt-tolerant frozen repair mortar bond strength,drying shrinkage,mechanical properties,the influence of salt frost resistance and SEM studies.The experimental results show that the optimum mixture ratio of the composite material was that the Power-D was 0.6%,the dispersed emulsion powder was 2.5%,the causing agent is 0.01%,the R-CSA is 8.0%.Under the optimal ratio of composite material can improve the compressive strength of repair mortar,reduce drying shrinkage,and the 300 times of salt freezing circulation of the mass loss is only 4.3% and 4.5%,the 28 d hydration products was more dense.
引文
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[7]张辉,潘友强,张健.水泥混凝土抗盐冻性能影响因素研究[J].重庆交通大学学报(自然科学版),2013(4):51-54.
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[9]ACOBSEN S.Calculating liquid transport into high-performance concrete during wet freeze/thaw[J].C.C.R.,2005(35):213-21.
[10]MAHMOOD N.Effects of cyclic loading freeze-thaw and temperature changes on she-ar bond strengths of different concrete repair systems[J].Journal of Adesion,2008(9):743-763.
[2]杨全兵.混凝土盐冻破坏机理(I)——毛细管饱水度和结冰压[J].建筑材料学报,2007(5):522-527.
[3]MEHTA P K,MONTEIRO P J.Concrete,microstructure,properties and materials[M].
[4]赵霄龙.寒冷地区高性能混凝土耐久性及其评价方法研究[D].哈尔滨:哈尔滨工业大学,2001:32-37.
[5]马昆林,谢友均,李立斌,等.混凝土在NaCl溶液中抗冻及抗渗性能的研究[J].混凝土,2006,200(6):15-17.
[6]刘建忠,孙伟,缪昌文,等.矿物掺合料对低水胶比混凝土干缩和自收缩的影响[J].东南大学学报:自然科学版,2009,39(3):580-585.
[7]张辉,潘友强,张健.水泥混凝土抗盐冻性能影响因素研究[J].重庆交通大学学报(自然科学版),2013(4):51-54.
[8]李中华,巴恒静.混凝土的抗盐冻性能[J].吉林大学学报(工学版),2009(4):91-96
[9]ACOBSEN S.Calculating liquid transport into high-performance concrete during wet freeze/thaw[J].C.C.R.,2005(35):213-21.
[10]MAHMOOD N.Effects of cyclic loading freeze-thaw and temperature changes on she-ar bond strengths of different concrete repair systems[J].Journal of Adesion,2008(9):743-763.
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