高性能环氧树脂透水混凝土的制备及其性能研究

Preparation and properties of high performance epoxyresin permeable concrete

以不同质量分数(0,1%,2%,3%)的水性环氧树脂为改性剂,制备了高性能环氧树脂透水混凝土,研究了环氧树脂掺杂量对透水混凝土力学性能、透水性能、抗冻性能和微观形貌的影响。结果表明,适量的环氧树脂掺入透水混凝土后,可以增加骨料与砂浆之间的粘度,并提高其结合强度,从而提高了改性透水混凝的力学性能、透水性能和抗冻性能;随着环氧树脂掺杂量的增加,改性透水混凝土的抗压强度和抗折强度先增大后减小,透水系数和质量损失率先减小后轻微增大;当环氧树脂的掺杂量为2%(质量分数)时,28 d的抗压强度和抗折强度达到最大值,分别为13.17和1.26 MPa,透水系数和质量损失率(60次冻融循环下)达到了最小值,分别为4.84 mm/s和0.3233%;环氧树脂的掺杂提高了透水混凝土的结构致密性,当环氧树脂的掺杂量为2%(质量分数)时,改性透水混凝土的结构致密性最高,微裂纹较少,抗冻性能最佳。

High performance epoxy resin permeable concrete was prepared with different mass fractions(0,1%,2%,3%)of waterborne epoxy resin as modifier.The effects of epoxy resin doping on the mechanical properties,water permeability,frost resistance and micro morphology of permeable concrete were studied.The results show that proper amount of epoxy resin can increase the viscosity between aggregate and mortar,and improve the bonding strength,so as to improve the mechanical properties,water permeability and frost resistance of modified permeable concrete.With the increase of epoxy resin content,the compressive strength and flexural strength of the modified permeable concrete first increased and then decreased,and the permeability coefficient and mass loss first decreased and then slightly increased.When the doping amount of epoxy resin was 2 wt%,the compressive strength and flexural strength at 28 d reached the maximum values,which were 13.17 and 1.26 MPa respectively,and the water permeability coefficient and mass loss rate(under 60 freeze-thaw cycles)reached the minimum values,which were 4.84 mm/s and 0.3233%respectively.The doping of epoxy resin improves the structural compactness of permeable concrete.When the doping amount of epoxy resin is 2 wt%,the modified permeable concrete has the highest structural compactness,less microcracks and the best frost resistance.