盐分与冻融循环对聚酯纤维沥青混合料水稳定性的影响研究

发布时间：2018-05-01 12:02

本文选题：聚酯纤维 + 沥青混合料　；参考：《安徽理工大学》2017年硕士论文

【摘要】：随着我国公路建设的高速发展,由于道路特点及车辆所需的各种安全性能,沥青路面已成为最主要的路面之一。沥青混合料是路面材料的必备材料,它不仅提高了行车的安全性、舒适性等各种安全性能,还可以提高路面的使用寿命。大型交通工具的发展,加速了沥青路面的发展,对于提高沥青混合料的性能,掺加聚酯纤维是最有效的方法之一。随着聚酯纤维的掺加,沥青路面的各种路用性能得到了有效地改善,其使用寿命也相对提高不少。对此,聚酯纤维沥青混合料的性能是研究的重点,通过掺加0、0.1%、0.2%、0.3%的聚酯纤维于沥青混合料中,制作成了标准马歇尔试件,将其放于0、10%、15%、20%的氯化钠溶液中浸泡,再经过0、2、4、6、8次的冻融循环试验,最后进行劈裂试验,分析了该路面材料在盐分侵蚀与冻融循环下的力学性能和水稳定性能。得到的有关结论如下:(1)当氯化钠盐溶液浓度与冻融循环次数不变时,沥青混合料的冻融劈裂抗拉强度与冻融劈裂抗拉强度比随着聚酯纤维掺量的增加,而出现的变化规律为:先增大后减小。(2)聚酯纤维掺加于沥青混合料中对其性能的改善的变化过程中有峰值出现,因而,聚酯纤维的掺量存在最佳值,且为0.2%。(3)当聚酯纤维掺量与冻融循环次数不变时,随着氯化钠浓度的增加,沥青混合料的冻融劈裂抗拉强度与冻融劈裂抗拉强度比都在逐渐降低,其水稳定性能也在逐渐减弱。(4)当只考虑冻融循环次数的影响因素时,随着冻融循环次数的增加,沥青混合料的冻融劈裂抗拉强度在降低,其水稳定性也逐渐减弱。
[Abstract]:With the rapid development of highway construction in China, asphalt pavement has become one of the most important pavement due to the characteristics of roads and various safety properties required by vehicles. Asphalt mixture is a necessary material for pavement materials. It not only improves the safety and comfort of driving, but also improves the service life of pavement. The development of large-scale transportation accelerates the development of asphalt pavement. Adding polyester fiber is one of the most effective methods to improve the performance of asphalt mixture. With the addition of polyester fiber, the road performance of asphalt pavement has been improved effectively, and its service life has been improved. In view of this, the performance of polyester fiber asphalt mixture is the focus of the research. Through adding 0. 1% 0. 1% polyester fiber and 0. 3% polyester fiber into the asphalt mixture, a standard Marshall specimen is made, and it is immersed in a solution of 0. 10% and 15. 15% sodium chloride. After 8 times of freeze-thaw cycle test, the splitting test was carried out, and the mechanical properties and water stability of the pavement material under salt erosion and freeze-thaw cycle were analyzed. The conclusions are as follows: (1) when the concentration of sodium chloride solution and the number of freeze-thaw cycles are not changed, the ratio of freeze-thaw splitting tensile strength and freeze-thaw splitting tensile strength of asphalt mixture increases with the increase of polyester fiber content. But the change rule is: increase first, then decrease. 2) there is a peak value in the process of adding polyester fiber to the asphalt mixture to improve its performance, therefore, the content of polyester fiber has the best value. The ratio of freezing and thawing splitting tensile strength and freeze-thaw splitting tensile strength of asphalt mixture decreases gradually with the increase of sodium chloride concentration when the content of polyester fiber and the number of freeze-thaw cycles are not changed. The water stability of asphalt mixture decreases gradually when only the factors affecting the number of freeze-thaw cycles are considered, with the increase of freeze-thaw cycles, the tensile strength of freeze-thaw splitting of asphalt mixture decreases, and the water stability decreases gradually.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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