水性環(huán)氧改性水泥砂漿路用性能與機理研究
發(fā)布時間：2018-11-23 11:40
【摘要】：采用水性環(huán)氧樹脂乳液對水泥砂漿進行改性,分析了其對水泥砂漿流變性、抗壓和抗折強度、黏結強度以及收縮特性的影響,并結合SEM微結構分析,探討了水性環(huán)氧樹脂的改性機理。結果表明:摻入水性環(huán)氧樹脂乳液后,能顯著增強水泥顆粒的分散,大幅度提高水泥砂漿的流動性能;水泥砂漿的7、28d抗折與抗壓強度均有所提高,當聚灰比為3%~9%時存在峰值;經過改性之后水泥砂漿試件的折壓比呈現增加趨勢,水泥砂漿的韌性有所增加;隨著聚灰比的不斷增加,黏結強度也不斷增加,當聚灰比為12%時,黏結強度出現最大值;隨著聚灰比的增大收縮率下降幅度越大,當摻量增大到12%以后,基本不再減小;摻入水性環(huán)氧樹脂乳液后氫氧化鈣晶體數量明顯減少,水化產物得以細化,內部結構密實度顯著提高。
[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.
【作者單位】： 遼寧省高等級公路建設局;長安大學;
【基金】：“十二五”國家科技支撐計劃項目(編號:2011BAE27B04)
【分類號】：U414
本文編號：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.
【作者單位】： 遼寧省高等級公路建設局;長安大學;
【基金】：“十二五”國家科技支撐計劃項目(編號:2011BAE27B04)
【分類號】：U414
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