水性环氧改性水泥砂浆路用性能与机理研究
发布时间：2018-11-23 11:40
【摘要】：采用水性环氧树脂乳液对水泥砂浆进行改性,分析了其对水泥砂浆流变性、抗压和抗折强度、黏结强度以及收缩特性的影响,并结合SEM微结构分析,探讨了水性环氧树脂的改性机理。结果表明:掺入水性环氧树脂乳液后,能显著增强水泥颗粒的分散,大幅度提高水泥砂浆的流动性能;水泥砂浆的7、28d抗折与抗压强度均有所提高,当聚灰比为3%~9%时存在峰值;经过改性之后水泥砂浆试件的折压比呈现增加趋势,水泥砂浆的韧性有所增加;随着聚灰比的不断增加,黏结强度也不断增加,当聚灰比为12%时,黏结强度出现最大值;随着聚灰比的增大收缩率下降幅度越大,当掺量增大到12%以后,基本不再减小;掺入水性环氧树脂乳液后氢氧化钙晶体数量明显减少,水化产物得以细化,内部结构密实度显著提高。
[Abstract]:The effects of waterborne epoxy resin emulsion on rheology, compressive and flexural strength, bond strength and shrinkage of cement mortar were analyzed, and the microstructure of SEM was analyzed. The modification mechanism of waterborne epoxy resin was discussed. The results show that the dispersion of cement particles and the fluidity of cement mortar can be greatly enhanced by adding waterborne epoxy resin emulsion. The flexural strength and compressive strength of cement mortar have been improved at 7 ~ 28 days, and there is a peak value when the aggregate cement ratio is 3 ~ 9, and the flexural pressure ratio of cement mortar specimen increases after modification, and the toughness of cement mortar increases. With the increasing of the ratio of aggregate to cement, the bond strength also increases. When the ratio of polymer to cement is 12, the bond strength reaches the maximum value, and the decrease of shrinkage ratio increases with the increase of the ratio of polymer to cement, and when the content of polymer increases to 12%, it will not decrease basically. The number of calcium hydroxide crystals was decreased, the hydration products were refined, and the density of internal structure was improved significantly after the addition of waterborne epoxy resin emulsion.
【作者单位】： 辽宁省高等级公路建设局;长安大学;
【基金】：“十二五”国家科技支撑计划项目(编号:2011BAE27B04)
【分类号】：U414
本文编号：2351474
[Abstract]:The effects of waterborne epoxy resin emulsion on rheology, compressive and flexural strength, bond strength and shrinkage of cement mortar were analyzed, and the microstructure of SEM was analyzed. The modification mechanism of waterborne epoxy resin was discussed. The results show that the dispersion of cement particles and the fluidity of cement mortar can be greatly enhanced by adding waterborne epoxy resin emulsion. The flexural strength and compressive strength of cement mortar have been improved at 7 ~ 28 days, and there is a peak value when the aggregate cement ratio is 3 ~ 9, and the flexural pressure ratio of cement mortar specimen increases after modification, and the toughness of cement mortar increases. With the increasing of the ratio of aggregate to cement, the bond strength also increases. When the ratio of polymer to cement is 12, the bond strength reaches the maximum value, and the decrease of shrinkage ratio increases with the increase of the ratio of polymer to cement, and when the content of polymer increases to 12%, it will not decrease basically. The number of calcium hydroxide crystals was decreased, the hydration products were refined, and the density of internal structure was improved significantly after the addition of waterborne epoxy resin emulsion.
【作者单位】： 辽宁省高等级公路建设局;长安大学;
【基金】：“十二五”国家科技支撑计划项目(编号:2011BAE27B04)
【分类号】：U414
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