级配离析对沥青稳定碎石技术特性影响研究
发布时间：2018-12-07 10:41
【摘要】：沥青稳定碎石作为路面结构的下面层是最容易发生离析的层位,也是离析差异性最显著的层位,作为沥青路面中主要的承力层和传力层,其质量好坏对结构整体的路用性能有着重要的影响。分析不同施工因素、研究离析对沥青稳定碎石路用性能的影响、提出不同性能下离析的控制指标、分析不同环境下的应力变化、定量计算离析的性能损失以及介绍离析的施工控制技术等内容,对控制沥青混合料的离析,延长沥青路面的服务寿命具有重要现实意义。首先,研究了河南商兰高速一段沥青稳定碎石路面进行了离析调查,从施工水平对其研究后发现和针对同一配合比,施工单位的施工水平是沥青稳定碎石级配离析的重要影响因素;在施工水平一定的情况下,沥青稳定碎石自身配比也是级配离析的重要影响因素。其次,本文在室内试验环境条件下从混合料离析后的级配角度出发,通过设计混合料的不同级配离析值表征集料的离析状况,进而将成型后的试件进行高温、低温、水损、疲劳、力学强度等方面的性能测试,以评价离析对沥青稳定碎石材料路用特性的影响。研究发现,在高温季节重载预防泛油,以控制细集料的重度离析的区域为主,预防车辙病害以控制细集料的中度离析极其以上等级的离析;在低温环境下预防低温开裂,须将粗集料的中度离析的作为控制指标;在多雨地区预防水损害,建议对粗集料中度离析区域加以严格控制。然后,利用Abaqus有限元设计软件的数据分析处理功能,分别对道路结构层在持续静载、温度场、温荷耦合场的三种环境条件下进行受力模拟。借鉴AI设计原理,提出表征离析对结构影响的损失计算方法。研究发现:沥青稳定碎石离析对下面层影响最大,特别在是粗集料中度离析时,下面层结构可能发生损伤破坏。下面层粗离析类别下的粗轻度、粗中度、粗重度的性能率依次损失27.8%,50.1%,87.1%。最后,从配合比设计验证、沥青混合料的生产、储存运输、摊铺和碾压各个阶段提出了控制沥青混合料离析的技术和手段,研究成果对提升沥青路面质量具有重要意义。
[Abstract]:Asphalt stabilized macadam, as the lower layer of pavement structure, is the most prone to segregation, and also the most distinct layer of segregation, as the main bearing layer and force transfer layer in asphalt pavement. The quality of the structure has an important impact on the overall road performance. This paper analyzes different construction factors, studies the influence of segregation on pavement performance of asphalt stabilized macadam, puts forward the control index of segregation under different performance, and analyzes the stress changes in different environments. The quantitative calculation of the performance loss of segregation and the introduction of construction control technology of segregation have important practical significance for controlling the segregation of asphalt mixture and prolonging the service life of asphalt pavement. First of all, the segregation investigation of asphalt stabilized macadam pavement of Shanglan Expressway in Henan Province was carried out, and the same mix ratio was found from the study of construction level. The construction level of the construction unit is an important factor affecting the gradation and segregation of asphalt stabilized macadam. In the case of certain construction level, the ratio of asphalt stabilized macadam itself is also an important factor of gradation segregation. Secondly, from the point of view of gradation after segregation of mixture, this paper designs the segregation status of materials in the different gradation table of mixture under the condition of indoor test environment, and then carries out high temperature, low temperature and water loss of the formed specimen. In order to evaluate the influence of segregation on pavement characteristics of asphalt stabilized macadam, fatigue and mechanical strength were tested. It is found that the prevention of flooding oil in high temperature season is mainly in the area of controlling heavy segregation of fine aggregates and the prevention of rutting diseases is to control the moderate segregation of fine aggregates and the segregation of more than the grade of fine aggregates. The moderate segregation of coarse aggregate should be taken as the control index in low temperature environment, and the prevention of water damage in rainy area should be strictly controlled in the area of moderate segregation of coarse aggregate. Then, using the data analysis and processing function of Abaqus finite element design software, the forces of road structure layer are simulated under three kinds of environment conditions: continuous static load, temperature field and temperature load coupling field respectively. Based on the design principle of AI, a loss calculation method to characterize the effect of segregation on structure is proposed. It is found that the segregation of asphalt stabilized macadam has the greatest influence on the lower layer, especially when the coarse aggregate is moderately segregated, the structure of the lower layer may be damaged and destroyed. Under the coarse segregation category, the performance rate of coarse light, coarse medium and coarse gravity in turn lost 27.8% and 50.1% and 87.1% respectively. Finally, the technology and means of controlling the segregation of asphalt mixture are put forward from the aspects of mix design verification, production, storage and transportation of asphalt mixture, spreading and rolling. The research results are of great significance to improve the quality of asphalt pavement.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
本文编号：2367073
[Abstract]:Asphalt stabilized macadam, as the lower layer of pavement structure, is the most prone to segregation, and also the most distinct layer of segregation, as the main bearing layer and force transfer layer in asphalt pavement. The quality of the structure has an important impact on the overall road performance. This paper analyzes different construction factors, studies the influence of segregation on pavement performance of asphalt stabilized macadam, puts forward the control index of segregation under different performance, and analyzes the stress changes in different environments. The quantitative calculation of the performance loss of segregation and the introduction of construction control technology of segregation have important practical significance for controlling the segregation of asphalt mixture and prolonging the service life of asphalt pavement. First of all, the segregation investigation of asphalt stabilized macadam pavement of Shanglan Expressway in Henan Province was carried out, and the same mix ratio was found from the study of construction level. The construction level of the construction unit is an important factor affecting the gradation and segregation of asphalt stabilized macadam. In the case of certain construction level, the ratio of asphalt stabilized macadam itself is also an important factor of gradation segregation. Secondly, from the point of view of gradation after segregation of mixture, this paper designs the segregation status of materials in the different gradation table of mixture under the condition of indoor test environment, and then carries out high temperature, low temperature and water loss of the formed specimen. In order to evaluate the influence of segregation on pavement characteristics of asphalt stabilized macadam, fatigue and mechanical strength were tested. It is found that the prevention of flooding oil in high temperature season is mainly in the area of controlling heavy segregation of fine aggregates and the prevention of rutting diseases is to control the moderate segregation of fine aggregates and the segregation of more than the grade of fine aggregates. The moderate segregation of coarse aggregate should be taken as the control index in low temperature environment, and the prevention of water damage in rainy area should be strictly controlled in the area of moderate segregation of coarse aggregate. Then, using the data analysis and processing function of Abaqus finite element design software, the forces of road structure layer are simulated under three kinds of environment conditions: continuous static load, temperature field and temperature load coupling field respectively. Based on the design principle of AI, a loss calculation method to characterize the effect of segregation on structure is proposed. It is found that the segregation of asphalt stabilized macadam has the greatest influence on the lower layer, especially when the coarse aggregate is moderately segregated, the structure of the lower layer may be damaged and destroyed. Under the coarse segregation category, the performance rate of coarse light, coarse medium and coarse gravity in turn lost 27.8% and 50.1% and 87.1% respectively. Finally, the technology and means of controlling the segregation of asphalt mixture are put forward from the aspects of mix design verification, production, storage and transportation of asphalt mixture, spreading and rolling. The research results are of great significance to improve the quality of asphalt pavement.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
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