含盐高湿环境对沥青混合料性能及内部形态的影响

发布时间：2018-07-12 14:33

本文选题：含盐高湿环境 + 沥青混合料　；参考：《武汉理工大学学报》2014年09期

【摘要】：为了深入研究含盐高湿环境对沥青混合料的侵蚀机理,促进临海地区沥青路面的建设。在5%、10%和15%的NaCl溶液中干湿循环沥青混合料以加速模拟含盐高湿环境的侵蚀,通过室内试验研究氯盐溶液对沥青混合料性能的影响,并采用CT扫描研究混合料内部微观结构的变化。结果表明:混合料的高温、低温、水稳及耐久性能均随NaCl溶液浓度的增加逐渐下降,尤其是水稳定性下降最严重,残留稳定度和冻融劈裂强度比无法满足规范要求;混合料的空隙率随干湿循环次数的增加逐渐增大,混合料内部析出氯盐晶体并不断膨胀,最终导致了沥青混合料性能劣化。
[Abstract]:In order to study the erosion mechanism of bituminous mixture in salt and high humidity environment, and promote the construction of asphalt pavement in coastal area. In order to accelerate the corrosion simulation of high humidity environment containing salt, the effect of chloride solution on the performance of asphalt mixture was studied through laboratory tests. The asphalt mixture was recycled in 10% and 15% NaCl solution to accelerate the corrosion simulation. The microstructure of mixture was studied by CT scanning. The results showed that the high temperature, low temperature, water stability and durability of the mixture decreased gradually with the increase of NaCl concentration, especially the water stability was the most serious, and the residual stability and the ratio of freezing and thawing splitting strength could not meet the requirements of the specifications. The porosity of the mixture increases with the increase of dry-wet cycle times, and the chloride crystal is precipitated and expanded, which leads to the deterioration of asphalt mixture performance.
【作者单位】：长安大学特殊地区公路工程教育部重点实验室;
【基金】：国家自然科学基金(51008031)
【分类号】：U414

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