湿热地区多孔排水沥青混合料路用性能研究

发布时间：2018-01-30 02:41

  本文关键词： 湿热地区 多孔排水沥青混合料 高粘沥青 沥青胶浆 路用性能　出处：《福州大学》2014年硕士论文　论文类型：学位论文

【摘要】：湿热地区气候高温多雨,多孔排水改性沥青技术的应用具有广泛的应用前景。本文重点针对多孔透水沥青路面的改性沥青混合料的路用性能与材料设计开展了研究。具体包括多孔排水沥青混合料配合比设计,多孔排水沥青混合料路用性能,高粘改性沥青胶浆特性,高粘改性沥青性能特性,多孔排水沥青混合料施工与技术指标研究等,研究结论如下：空隙率与2.36mm筛孔通过率呈现良好的正相关,随着2.36mm筛孔通过率增加,空隙率逐渐减小。在孔隙率确定的情况下,影响多孔排水沥青混合料配合比设计最敏感的两个因素是沥青类型(沥青技术指标)和油石比。连续空隙率随混合料的总空隙率增大而增大,两者基本呈线性关系。沥青的品种和含量对混合料的空隙率影响不大。空隙率越大,石石结构特征越显著,混合料结构强度下降,刚性增强。不同空隙率多孔沥青混合料的渗水系数均超过900ml/15s要求,渗水系数与空隙率有明显的相关性,空隙率(%)与渗水系数(ml/15s)近似呈线性关系。空隙率增大,多孔排水沥青混合料构造深度越大,高粘沥青的使用一定程度降低构造深度。多孔状态下,构造深度可达130～240(0.01mm),2%的混合料孔隙率改变将导致40(0.01mm)个构造深度的改变。排水沥青混合料功能的实现主要取决于级配的设计,但空隙率越大混合料骨架的力学性能越差,排水多孔混合料性能的实现、耐久性保障和进一步提升主要取决于沥青。沥青的高粘度是保证骨架结构、防飞散、高温稳定性、水稳定性的关键指标。高粘改性沥青的制备,往往导致低温指标、韧度和柔度指标的下降,以及135℃施工粘度过粘,如何确保高粘改性沥青具有较好的低温指标、韧度和135℃施工和易性,以及较好的抗老化性能,是研发和挑选高性能高粘改性沥青的关键。沥青胶浆的性质主要有沥青性质决定,矿粉一方面使沥青变稠,但胶浆相比沥青的高温性能变化不大,但低温性能下降显著,这对于沥青的研发和选择来看,重视沥青的低温指标控制十分重要。综合以上,以及参照国内外的相关规范要求,本文给出了湿热地区多孔排水沥青及沥青混合料的技术指标。建议进一步加强高性能改性沥青的研究,高粘沥青性能的发展是未来多孔排水沥青混合料性能提升的重要动力。
[Abstract]:In humid and hot areas, the climate is hot and rainy. The application of porous drainage modified asphalt technology has a wide application prospect. This paper focuses on the road performance and material design of the modified asphalt mixture of porous permeable asphalt pavement, including porous drainage leachate. Mix ratio design of green mixture. The road performance of porous drainage asphalt mixture, high viscosity modified asphalt slurry, high viscosity modified asphalt performance, porous drainage asphalt mixture construction and technical index research. The results are as follows: there is a good positive correlation between the porosity and the pass rate of 2.36mm sieve hole. With the increase of the pass rate of 2.36mm sieve hole, the porosity decreases gradually. The two most sensitive factors affecting the mix design of porous and drained asphalt mixture are asphalt type (asphalt technical index) and asphalt stone ratio. The continuous void ratio increases with the increase of the total porosity of the mixture. The variety and content of asphalt have little effect on the porosity of mixture. The larger the void ratio, the more obvious the structural characteristics of stone and the decrease of structural strength of mixture. The permeability coefficient of porous asphalt mixture with different porosity is more than 900ml / 15s, and there is obvious correlation between permeability coefficient and porosity. The porosity is approximately linearly related to the permeability coefficient (ml / 15s). The greater the porosity, the greater the structural depth of porous drainage asphalt mixture. The use of high viscosity asphalt reduces the depth of structure to a certain extent. In porous state, the depth of structure can reach 130 ~ 240 ~ 0.01mm). The change of porosity of 2% mixture will lead to the change of 40 ~ 0. 01 mm) structural depth. The realization of function of drainage asphalt mixture mainly depends on the design of gradation. However, the greater the void ratio, the worse the mechanical properties of the mixture, the performance of the porous mixture, durability protection and further improvement mainly depend on the asphalt. The high viscosity of asphalt is to ensure the skeleton structure, anti-flying. The key indexes of high temperature stability and water stability. The preparation of high viscosity modified asphalt often leads to the decrease of low temperature index, toughness and flexibility index, as well as the viscosity overviscosity at 135 鈩，

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