盐溶液与高温耦合作用下沥青混合料性能衰变规律及防治措施

发布时间：2018-01-20 12:43

本文关键词： 道路工程盐-湿-热循环作用路用性能疲劳性能衰变规律改善措施　出处：《公路工程》2017年05期 　论文类型：期刊论文

【摘要】：为准确评价盐-湿-热循环作用对沿海含盐高湿区沥青混合料路用性能和疲劳性能的损伤规律,针对沿海高温多雨地区沥青路面在荷载、高温、海盐水冻融循环作用下剩余弯拉强度和疲劳寿命进行研究,制定了适宜的盐-湿-热循环试验方案,分析给出了盐-湿-热循环作用下沥青混合料路用性能、疲劳性能的损失率计算模型。进而对比分析了硅藻土、岩沥青、木质素纤维、聚酯纤维、玄武岩纤维、抗剥落剂ARM、消石灰对含盐高湿环境沥青混凝土路用性能和疲劳性能的改善效果。试验结果表明:在盐-湿-热循环过程中沥青混合料的车辙试验动稳定度、弯曲应变、弯拉强度、疲劳寿命能衰变规律符合logistics生长曲线模型。沥青混合料各项路用性能、力学性能、抗疲劳性能劣化程度随着盐溶液浓度增大而增大,当盐溶液溶度超过10%后,继续增大盐溶液浓度沥青混合料性能劣化速率减小;前20次盐-湿-热循环作用下沥青混合料路用性能衰变劣化程度较为明显,继续增大盐-湿-热循环次数后沥青混合料高低温和水稳定性能劣化速率减小,可采用10%盐溶液浓度和盐-湿-热循环20次来模拟盐-湿-热侵蚀环境对沥青路面的负面影响;纤维类添加剂对含盐高湿环境沥青混合料抗疲劳性能、低温性能及高温性能改善效果最优,硅藻土对沥青混合料水稳定性改善效果最好,抗剥落剂和消石灰对沥青混合料在盐-湿-热循环作用后路用性能改善效果最差,建议在沿海含盐高湿地区优先采用玄武岩纤维来提高沥青混合料的水稳定性和抗疲劳耐久性能。
[Abstract]:In order to evaluate accurately the damage law of salt-wet-heat cycle on pavement performance and fatigue performance of bituminous mixture in high salinity and high humidity zone, aiming at the loading and high temperature of asphalt pavement in coastal high temperature and heavy rain area. The residual flexural strength and fatigue life of sea brine under freeze-thaw cycle were studied. The suitable salt-wet-heat cycle test scheme was established and the pavement performance of asphalt mixture under salt-wet-heat cycle was analyzed. Furthermore, diatomite, bitumen, lignin fiber, polyester fiber, basalt fiber and anti-stripping agent ARM were compared and analyzed. The effect of quicklime on the pavement performance and fatigue performance of asphalt concrete in salt and high humidity environment. The test results show that the dynamic stability and bending strain of asphalt mixture are tested in the process of salt-wet thermal cycling. Bending tensile strength, fatigue life energy decay law accords with logistics growth curve model. Asphalt mixture road performance, mechanical properties. The deterioration degree of fatigue resistance increases with the concentration of salt solution. When the solubility of salt solution exceeds 10%, the deterioration rate of asphalt mixture with increasing concentration of salt solution decreases. The degradation degree of pavement performance of asphalt mixture is obvious under the action of the first 20 times of salt-wet-heat cycle, and the degradation rate of high and low mild water stability of asphalt mixture decreases after increasing the times of salt-wet-heat cycle. 10% salt solution concentration and 20 salt-wet-heat cycles can be used to simulate the negative effects of salt-wet-heat erosion environment on asphalt pavement. Fiber additives have the best effect on anti-fatigue performance, low-temperature performance and high-temperature performance of asphalt mixture in salt and high humidity environment, and diatomite has the best effect on the water stability of asphalt mixture. Anti-stripping agent and quicklime have the worst effect on the performance improvement of asphalt mixture after salt-wet-heat cycling. It is suggested that basalt fibers should be preferred to improve the water stability and fatigue durability of bituminous mixtures in high salinity and high humidity areas along the coast.
【作者单位】：内蒙古交通设计研究院有限责任公司;上海大学材料科学与工程学院;
【基金】：国家科技支撑计划项目(2014BAG0780394)
【分类号】：U414
【正文快照】： 上海200044)沥青混合料各项路用性能、力学性能、抗疲劳性能劣化程度随着盐溶液浓度增大而增大,当盐溶液溶度超过10%后,继续增大盐溶液浓度沥青混合料性能劣化速率减小;前20次盐-湿-热循环作用下沥青混合料路用性能衰变劣化程度较为明显,继续增大盐-湿-热循环次数后沥青混合料

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