国产高温拌合型环氧沥青的固化行为与性能

Curing Behavior and Performance of Domestic High Temperature Mixing Epoxy Asphalt

利用荧光显微镜、差示扫描量热仪(DSC)、万能试验机、布氏黏度仪研究国产高温拌合型环氧沥青的微观固化形态、非等温条件下的固化行为、力学性能及施工和易性。观察发现,环氧沥青60℃固化4 d期间是"点-线-交联网状"的微观变化过程。DSC研究显示升温速率越高,环氧沥青固化热越小,沥青并不参与环氧树脂的自催化反应,但对环氧树脂固化体系有稀释作用。拉伸试验结果表明,环氧沥青结合料150℃容留1 h、2 h、3 h、4 h后,环氧树脂与基质沥青的相容性均较好,拉伸强度最大6.46 MPa,断裂伸长率265%。布氏黏度试验得到高温拌合型环氧沥青结合料在160℃、 2 h时黏度为1750 mPa·s。

Fluorescence microscopy, differential scanning calorimetry(DSC), universal testing machine and Brookfield viscometer were applied to study the micro-solidification morphology, the curing behavior under non-isothermal conditions, mechanical properties and construction workability of the domestic high-temperature mixing epoxy asphalt. It is observed that the epoxy asphalt has a "point-line-cross-network" microscopic change process during curing at 60 ℃ for 4 d. The result of DSC shows that the higher the heating rate is, the smaller the curing heat is. However, the asphalt does not participate in the autocatalytic reaction of the epoxy resin, but has a dilution effect on the curing system of the epoxy resin. Tensile test results indicate that after the epoxy asphalt binder is reserved at 150 ℃ for 1 h, 2 h, 3 h, 4 h, the compatibility of the epoxy resin with the matrix asphalt is good. The tensile strength is up to 6.46 MPa and the elongation at break is 265%. The viscosity of the high-temperature mixing epoxy asphalt measured by Brookfield viscometer at 160 ℃ for 2 h is 1750 mPa·s.