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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。
The water-based epoxy resin emulsion was used to modify the cement mortar. The rheological properties, compressive strength, flexural strength, bond strength and shrinkage of cement mortar were analyzed. Combined with SEM microstructure analysis, the effects of waterborne epoxy resin The modification mechanism. The results show that the dispersion of cement particles can be significantly enhanced by incorporating water-based epoxy resin emulsion, and the flowability of cement mortar can be greatly improved. The flexural strength and compressive strength of cement mortar increase at 7 and 28 days, And the peak value is between 3% and 9%. After the modification, the pressure-deflection ratio of cement mortar shows an increasing trend, the toughness of cement mortar increases, and as the ratio of cement to cement increases, the bond strength also increases. When the ash-cement ratio is 12%, the bond strength is the maximum value. With the increase of the ash-cement ratio, the shrinkage rate decreases more. When the ash content increases to 12%, the bond strength does not decrease any more. After the resin emulsion calcium hydroxide crystals significantly reduced the number of hydrated products to be refined, the internal structure of significantly increased density.