超薄罩面盐化物自融雪沥青混合料组成与性能研究

发布时间：2018-07-21 09:08

【摘要】：冬季积雪结冰使路面的抗滑能力快速下降,对行车安全和路面服务水平带来严重影响。盐化物自融雪沥青路面技术的出现为道路除冰雪提供了一个新的思路,然而该技术主要适用于新建工程的全厚式路面结构,对于大中修养护来说不仅会增加路面自重、提高路面标高,而且在降雪时路面底层的盐化物无法释放,既达不到预定的效果,也会抬高工程造价,并造成材料的浪费。因此设计融雪效果优良、使用功能多样、造价低廉的超薄盐化物自融雪罩面材料具有十分重要的现实意义。论文首先采用逐级填充试验,以粗集料间隙率(VCA)、CBR和最大承载力(MPL)为主要指标,研究超薄SMA-5混合料的矿料组成,得到各档集料的最佳配比和主骨料、填充料关键筛孔,并由马歇尔试验得到最佳的主骨料和填充料比例,优化SMA-5混合料的级配范围。然后利用动态剪切流变仪(DSR)和布氏粘度计研究高粘改性沥青胶浆的动态流变特性,提出合适的粉胶比范围,并在最佳粉胶比前提下,研究盐化物替代矿粉的比例对沥青胶浆特性的影响;模拟超薄罩面的实际服役状态,研究超薄盐化物自融雪沥青混合料(TSSAM)加铺对普通混合料性能的改善效果,并分析盐化物替代量对混合料高温稳定性、低温抗裂性、水稳定性和粘附性的影响,结合沥青胶浆和混合料试验结果得到盐化物的最大替代量。最后根据冰点降低理论,提出TSSAM融雪性能和融雪寿命的评价指标,对融雪性能和融雪寿命展开研究。论文从矿料级配组成、沥青胶浆特性和沥青混合料路用性能三方面得到TSSAM的基本材料组成和关键设计参数,并验证其在不同条件下的融雪性能和融雪寿命,为TSSAM的组成设计和施工提供理论依据。
[Abstract]:The freezing of snow in winter makes the anti skid ability of the pavement decrease rapidly, which has a serious influence on the safety of the road and the service level of the pavement. The appearance of the salinized snow melting asphalt pavement technology provides a new idea for the road removal of ice and snow. However, this technology is mainly applied to the full thickness pavement structure of the new construction project, which is not suitable for the cultivation of the middle and the middle schools. It will only increase the self weight of the pavement, improve the elevation of the pavement, and can not be released at the bottom of the pavement during the snowfall, which can not only reach the desired effect, but also raise the cost of the project and cause the waste of the material. Therefore, it is very important to design the super thin salinization material with excellent snow melting effect and low cost. At first, the paper uses a step by step filling test to study the mineral composition of ultra-thin SMA-5 mixture with coarse aggregate clearance rate (VCA), CBR and maximum bearing capacity (MPL) as the main index. The optimum proportion of the aggregate and the main aggregate, the key sieve hole of the filling material are obtained, and the optimum proportion of the main aggregate and filling material is obtained by Marshall test, and the optimization of the proportion of the main aggregate and filling material is obtained. The gradation range of SMA-5 mixture. Then the dynamic rheological properties of high viscosity modified asphalt mortar are studied by dynamic shear rheometer (DSR) and brucellus viscometer. The suitable range of powder binder ratio is put forward, and the effect of the proportion of salinized material on the properties of asphalt mortar is studied under the optimal ratio of powder to binder ratio, and the actual clothes of a super thin cover face are simulated. In the service state, the effect of the super thin salinization on the performance of the mixture of snow melt asphalt mixture (TSSAM) was studied, and the effects of the replacement amount of the salinized material on the high temperature stability, the low temperature crack resistance, the water stability and the adhesion were analyzed. The maximum replacement amount of the salinized material was obtained with the results of the asphalt mortar and the mixture test. According to the theory of freezing point reduction, the evaluation index of TSSAM snowmelt performance and snowmelt life is put forward, and the snowmelt performance and snowmelt life are studied. The basic material composition and key setting parameters of TSSAM are obtained from the three aspects of the composition of mineral aggregate gradation, asphalt mortar properties and asphalt mixture road performance, and the snow melting under different conditions is verified. Performance and snowmelt life provide theoretical basis for the composition design and construction of TSSAM.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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