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环氧沥青混凝土的水损坏机理研究

DOI: 10.3969/j.issn.1674-0696.2015.01.12, PP. 54-59

Keywords: 道路工程,环氧沥青,水损坏,破坏机理,冻融循环,力学性能,roadengineering,epoxy-asphalt,waterdamage,damagemechanism,freeze-thawcycles,mechanicalproperty

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Abstract:

:？利用冻融循环前后环氧沥青力学强度、吸水率、pH值以及DMA分析，并结合环氧沥青混凝土剥离断面的显微照片、环氧沥青的荧光显微照片，研究了环氧沥青混凝土在冻融循环实验条件下的水损坏机理。研究表明：环氧沥青混凝土在冻融循环条件下的水损破坏主要表现为，物理方面沥青相与环氧树脂以及集料分散情况的破坏，化学方面环氧树脂固化结构的破坏，即在冻融循环初期，水分子进入环氧沥青体系中造成环氧树脂发生水解，破坏环氧树脂的交联固化的分子结构；冻融循环后期，水分子使沥青相从环氧树脂固化系中逐渐析出，沥青逐渐析出固化体系，导致体系的分散结构，造成体系拉伸强度从5.12MPa降低到3.46MPa，降幅约32.42%，黏结强度从47.87MPa降低到46.31MPa，降幅为3.25%。

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