硫酸盐-干湿循环侵蚀环境下纤维沥青混合料低温抗裂性研究

发布时间：2018-10-21 20:50

【摘要】：基于国内外对硫酸盐腐蚀环境下纤维沥青混合料的低温抗裂性鲜有研究的现状,采用干湿循环作用下不同浓度(5%、10%)Na2SO4溶液加速劣化试验,研究了水镁石纤维沥青混合料在Na2SO4腐蚀介质中的低温抗裂性变化规律,并与聚酯纤维和玄武岩纤维沥青混合料进行对比;探索了沥青混合料硫酸盐腐蚀损伤机理及纤维在混合料中的阻裂作用。研究结果表明:与纯净水环境相比,沥青混合料在盐蚀环境下的低温抗裂性能劣化程度更为严重;Na2SO4溶液渗入沥青混合料空隙和裂缝中发生的结晶型侵蚀是导致沥青混合料低温抗裂性劣化的主要诱因;水镁石纤维具有优良的增强增韧效应,可以有效提高沥青混合料在硫酸盐腐蚀环境下的低温抗裂性。研究成果可为硫酸盐富集地区沥青混合料材料组成设计提供参考。
[Abstract]:Based on the present situation of low temperature crack resistance of fiber asphalt mixture under sulphate corrosion environment, accelerated degradation test of Na2SO4 solution with different concentration (510%) under dry and wet cycling was adopted. The low temperature crack resistance of brucite fiber asphalt mixture in Na2SO4 corrosion medium was studied and compared with that of polyester fiber and basalt fiber asphalt mixture. The mechanism of sulphate corrosion damage of asphalt mixture and the effect of fiber on cracking resistance in mixture were explored. The results show that compared with pure water environment, The deterioration degree of low temperature crack resistance of asphalt mixture under salt corrosion environment is more serious, and the main inducement of low temperature crack resistance deterioration of asphalt mixture is Na2SO4 solution permeating into the void and crack of asphalt mixture. Brucite fiber has excellent reinforcing and toughening effect and can effectively improve the low temperature cracking resistance of asphalt mixture under sulphate corrosion environment. The research results can provide a reference for the design of asphalt mixture material composition in sulphate enrichment area.
【作者单位】：长安大学材料科学与工程学院;
【基金】：河南省交通厅科技计划项目(2012P30)
【分类号】：U414

【参考文献】