旧沥青路面薄层罩面的养护时机及层间技术研究
发布时间：2019-05-11 21:18
【摘要】：近几年来,随着预防性养护技术的逐步推广,旧沥青路面加铺薄层罩面技术也得到了广泛的应用。旧沥青路面加铺薄层罩面作为一种事先、主动的预防性养护技术,如何确定其最佳的养护时机显得尤为重要；同时,在该技术的实际应用过程中,常因薄层罩面与旧沥青路面层间性能不稳定而导致病害的产生,层间性能的稳定与否是薄层罩面发挥其预防性养护功能的关键因素。因此,对薄层罩面最佳养护时机及其层间性能方面的研究具有重要的理论意义和实用价值。首先,在对国内外常用预防性养护最佳养护时机确定方法进行分析的基础上,应用生命周期费用分析,通过效果(效益)-费用比确定出薄层罩面最佳养护时机。然后,通过对薄层罩面结构粘结层材料的性能及层间粘结强度理论的研究,应用BISAR3.0软件对薄层罩面结构在行车荷载作用下的层间力学响应进行分析,得到层间的最大剪应力出现在单轮中心下的前部区域,而最大拉应力出现在单轮中心下的后部区域。水平力系数、罩面厚度、面层厚度、温度等对结构层间的最大剪应力和最大拉应力有较大的影响,同时提出了薄层罩面结构层间粘结技术指标。最后,通过两种罩面层材料和三种粘结材料的室内直剪试验,确定薄层罩面结构层间抗剪强度随着粘结层材料用量的变化规律,并得到两种薄层罩面材料对应不同粘结层材料的最佳用量。同时,得到薄层罩面结构粘结层材料中SBS改性沥青粘结性能最优,70-A沥青次之,改性乳化沥青粘结性能略差,但抗剪强度均满足所提出的抗剪强度指标要求。通过考虑不同温度和浸水条件对粘结层性能影响的试验得到,两者均对粘结层抗剪强度有较为不利的影响,SBS改性沥青受影响较大,70-A沥青次之,改性乳化沥青相对较弱。通过在粘结层最佳沥青用量条件下的室内拉拔试验得出层间抗拉强度变化规律,且所得抗拉强度均满足所提出的抗拉强度指标要求。
[Abstract]:In recent years, with the gradual popularization of preventive maintenance technology, the thin layer overlay technology of old asphalt pavement has also been widely used. As a kind of preventive maintenance technology, how to determine the best maintenance time is particularly important for the old asphalt pavement to be covered with thin layer as a kind of preventive maintenance technology in advance and initiative. At the same time, in the practical application of this technology, the instability of interlaminar performance between thin layer overlay and old asphalt pavement often leads to diseases, and the stability of interlaminar performance is the key factor for thin layer overlay to give full play to its preventive maintenance function. Therefore, it is of great theoretical significance and practical value to study the optimum curing time and interlaminar properties of thin layer overlay. First of all, based on the analysis of the method of determining the best maintenance time of preventive maintenance at home and abroad, the life cycle cost analysis is applied to determine the optimal maintenance time of the thin layer cover through the effect (benefit)-cost ratio. Then, through the study of the properties of the bonding layer material and the theory of the interlaminar bond strength, the BISAR3.0 software is used to analyze the interlaminar mechanical response of the thin-layer overlay structure under the driving load, and the interlaminar mechanical response of the laminated overlay structure under the driving load is analyzed. It is obtained that the maximum shear stress between layers appears in the front region under the center of the single wheel, while the maximum tensile stress appears in the rear region under the center of the single wheel. The horizontal force coefficient, cover thickness, surface thickness and temperature have great influence on the maximum shear stress and the maximum tensile stress between the structural layers. At the same time, the technical index of interlaminar bonding of the thin-layer overlay structure is put forward. Finally, through the laboratory direct shear test of two kinds of overlay materials and three kinds of bonding materials, the variation of interlaminar shear strength of thin layer overlay structure with the amount of adhesive layer materials is determined. The optimum dosage of two kinds of thin layer covering materials corresponding to different bonding layer materials was obtained. At the same time, the adhesive performance of SBS modified asphalt is the best, 70 A asphalt is the second, and the modified emulsified asphalt is slightly worse, but the shear strength meets the requirements of the proposed shear strength index. By considering the effects of different temperature and immersion conditions on the properties of the adhesive layer, it is found that both of them have adverse effects on the shear strength of the adhesive layer. SBS modified asphalt is more affected, 70 / A asphalt is the second, and modified emulsified asphalt is relatively weak. The variation rule of inter-layer tensile strength is obtained by indoor pull-out test under optimum asphalt content of bond layer, and the obtained tensile strength meets the requirements of the proposed tensile strength index.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217;U418.6
本文编号：2474859
[Abstract]:In recent years, with the gradual popularization of preventive maintenance technology, the thin layer overlay technology of old asphalt pavement has also been widely used. As a kind of preventive maintenance technology, how to determine the best maintenance time is particularly important for the old asphalt pavement to be covered with thin layer as a kind of preventive maintenance technology in advance and initiative. At the same time, in the practical application of this technology, the instability of interlaminar performance between thin layer overlay and old asphalt pavement often leads to diseases, and the stability of interlaminar performance is the key factor for thin layer overlay to give full play to its preventive maintenance function. Therefore, it is of great theoretical significance and practical value to study the optimum curing time and interlaminar properties of thin layer overlay. First of all, based on the analysis of the method of determining the best maintenance time of preventive maintenance at home and abroad, the life cycle cost analysis is applied to determine the optimal maintenance time of the thin layer cover through the effect (benefit)-cost ratio. Then, through the study of the properties of the bonding layer material and the theory of the interlaminar bond strength, the BISAR3.0 software is used to analyze the interlaminar mechanical response of the thin-layer overlay structure under the driving load, and the interlaminar mechanical response of the laminated overlay structure under the driving load is analyzed. It is obtained that the maximum shear stress between layers appears in the front region under the center of the single wheel, while the maximum tensile stress appears in the rear region under the center of the single wheel. The horizontal force coefficient, cover thickness, surface thickness and temperature have great influence on the maximum shear stress and the maximum tensile stress between the structural layers. At the same time, the technical index of interlaminar bonding of the thin-layer overlay structure is put forward. Finally, through the laboratory direct shear test of two kinds of overlay materials and three kinds of bonding materials, the variation of interlaminar shear strength of thin layer overlay structure with the amount of adhesive layer materials is determined. The optimum dosage of two kinds of thin layer covering materials corresponding to different bonding layer materials was obtained. At the same time, the adhesive performance of SBS modified asphalt is the best, 70 A asphalt is the second, and the modified emulsified asphalt is slightly worse, but the shear strength meets the requirements of the proposed shear strength index. By considering the effects of different temperature and immersion conditions on the properties of the adhesive layer, it is found that both of them have adverse effects on the shear strength of the adhesive layer. SBS modified asphalt is more affected, 70 / A asphalt is the second, and modified emulsified asphalt is relatively weak. The variation rule of inter-layer tensile strength is obtained by indoor pull-out test under optimum asphalt content of bond layer, and the obtained tensile strength meets the requirements of the proposed tensile strength index.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217;U418.6
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，本文编号：2474859
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