水性环氧树脂改性水泥混凝土的制备及力学性能分析  

Preparation and mechanical properties ofcement concrete modified by waterborne epoxy resin

作　　者：钟鑫 ZHONG Xin(Capital Construction Dept,Southeast University,Nanjing 210000,China)

机构地区：[1]东南大学基本建设处,南京210000

出　　处：《功能材料》2021年第12期12008-12012,共5页Journal of Functional Materials

基　　金：国家重点研发计划项目(2017YFC0806010)。

摘　　要：将水性环氧树脂引入到水泥混凝土中,通过调整水性环氧树脂的含量,制备了不同水性环氧树脂掺量(0,2%,4%和6%)(质量分数)的水泥混凝土,研究了环氧树脂改性对水泥混凝土力学性能、抗渗性能和微观形貌等的影响。结果表明,随着水性环氧树脂含量的增加,改性混凝土在7和28 d的抗压强度、抗折强度和干密度均呈现出先增加后轻微降低的趋势。当水性环氧树脂的掺量为4%(质量分数)时,混凝土的抗压强度、抗折强度和干密度达到了最大值,分别为41.15,8.67 MPa和278.6 kg/m^(3)。随着水性环氧树脂含量的增加,改性混凝土的吸水率出现了先降低后略微升高的现象,当水性环氧树脂含量为4%(质量分数)时,吸水率最低为28.3%。随着水性环氧树脂含量的增加,混凝土的耐水压力、渗水压力、抗渗等级均逐渐增大,水性环氧树脂的含量越高,抗渗性能越强。SEM分析发现,随着水性环氧树脂含量的增加,改性混凝土的气孔尺寸呈现出先降低后升高的趋势,当水性环氧树脂含量为4%(质量分数)时,气孔尺寸较小,约为2~3 mm。整体来看,水性环氧树脂的含量为4%(质量分数)时,改性混凝土的综合性能最佳。The waterborne epoxy resin was introduced into cement concrete,by adjusting the content of waterborne epoxy resin,cement concrete with different content of waterborne epoxy resin(0%,2wt%,4wt%and 6wt%)was prepared.The effects of epoxy resin modification on mechanical properties,impermeability and micro morphology of cement concrete were studied.The results showed that with the increased of the content of waterborne epoxy resin,the compressive strength,flexural strength and dry density of the modified concrete at 7 and 28 d showed a trend of first increasing and then slightly decreasing.When the content of waterborne epoxy resin was 4wt%,the compressive strength,flexural strength and dry density of concrete reached the maximum,which were 41.15,8.67 MPa and 278.6 kg/m^(3) respectively.With the increased of the content of waterborne epoxy resin,the water absorption of the modified concrete decreased at first and then slightly increased,and when the content of waterborne epoxy resin was 4wt%,the lowest water absorption was 28.3%.With the increased of the content of waterborne epoxy resin,the water resistance pressure,seepage pressure and impermeability grade of concrete increased gradually,and the higher the content of waterborne epoxy resin,the stronger the impermeability.SEM analysis showed that with the increased of the content of waterborne epoxy resin,the pore size of modified concrete first decreased and then increased,and when the content of waterborne epoxy resin was 4wt%,the pore size was about 2-3 mm.On the whole,when the content of waterborne epoxy resin was 4wt%,the comprehensive performance of modified concrete was the best.

关 键 词：水性环氧树脂 混凝土 力学性能 抗渗性能 微观形貌 

分 类 号：TU525[建筑科学—建筑技术科学]