江西高速公路沥青路面高温稳定性研究
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摘要
为了深化对沥青路面材料和结构层组合在江西独特的高温状况下力学性能和作用机致的认识,检验已建和拟建的高速公路的沥青路面结构的合理性,为工程提供有益建议,本课题通过常规的计算方法、有限元分析软件和材料试验等手段,对江西的气候、典型沥青路面结构及材料等进行了一系列的研究。
通过对江西各地的气候研究,参照“八五”攻关专题方法得出江西省沥青路面路用性能气候区划,以SHRP方法和有限元分析软件计算比较得出江西省各地沥青路面中选用的沥青结合料应达到的PG等级;通过对沥青混合料的高温稳定性分析,总结十几年来江西高速公路上采用的沥青混合料历程及经验,建议应选用的沥青混合料以及应该采用的措施,为提高沥青路面的高温稳定性、抗车辙变形能力等提供有力保证;通过对近年来省内高速公路上典型沥青路面的建模进行有限元分析,计算得出各结构中与其高温稳定性有关的力学指标(剪应力、剪应变)及其他相关的力学指标的分布、变化规律,同时也分析了目前比较关注的一个问题——沥青碎石柔性基层与路面抗车辙性能的关系,推荐了应优先采用的沥青路面结构。
研究认为,在江西省高速公路沥青路面建设中,为保证沥青路面的高温稳定性并兼顾其他性能,应在材料、集料级配、施工和路面结构组合等方面采用合适措施。沥青结合料应根据PG等级来选择,集料性质应符合规范要求,集料级配应采用粗型密级配(骨架密实型),优先采用AC-C、SMA等类混合料,推荐采用复合基层沥青路面。
当然,应对荷载、不同道路状况、抗剪强度指标、沥青路面车辙的预估等问题作进一步的研究,因条件所限,本课题未深入研究。
In order to deepn the cognitions of mechanical performancesand operating principles in asphalt pavement materials and structural buildups in the unique condition of hot environment in Jiangxi to verify the rationality of exepressway asphalt pavement structures built or would built ,and to submit beneficial recommendations for engineering,in course of the question research ,a series of works on the climate,typical asphalt pavement structures and materials of Jiangxi have been done by means of ordinary computing methods,finite-element program and material trials.
Via studying on climate of every area of Jiangxi,refer to the methods of Eight-Five Study Questions , arrival at the climatic regionalization of Jiangxi Province on asphalt pavement performance,educe the asphalt binder PG(performance grade)which should be attained when aspnalt binder used in every area of Jiangxi Province,by comparing the results attained by referring to methods of SHRP or analyzing with finite-element program;By way of research on high temperature stability for asphalt pavement, summarizing the courses and experiences of adopting asphalt mixtures in Jiangxi expressway constructed in recent years more than ten,recommend better asphalt mixtures and measures in order to offer effective assurance for improving the high temperature stability and resistance to nutting of asphalt pavement, etc.;With the analysis of typical asphalt pavement structures on expressway built in recent years do by finit-element program,find the regularities of distribution and variation of mechnical factors(shear stress,shear strain,etc.)and others concerned with high temperature stability of each and every asphalt pavement structure,at the same time analyze an attention-getting question concerning the relation between asphalt stabilized macadam base course and performances of nutting resistance of asphalt pavement ,introduce the pavement structures be adopted by preference.
It's considered that suitable measures should be adopted in the way of material,aggregate-grading,construction and structure buildup in order to ensure asphalt pavemeant have stronger high temperature stability and others in the construcionof Jiangxi expressway,asphalt,which asphalt binders being chosen in accordance to asphalt PG, aggregate qualities according to criteria,aggregate-grading being corse-close-grained one (close-grained compages),asphalt mixtures such as AC-C,SMA and all that being chosen firstly,and recommend to choose the asphalt pavement with complex base course on espressway.
At the end, the problems about loads,different road conditions,criteria of resistance to shear,beforehand estimate of nutting of asphalt pavement are brought forward ,which requiring further studies .For limited conditions ,these questions haven't been carried on home.
通过对江西各地的气候研究,参照“八五”攻关专题方法得出江西省沥青路面路用性能气候区划,以SHRP方法和有限元分析软件计算比较得出江西省各地沥青路面中选用的沥青结合料应达到的PG等级;通过对沥青混合料的高温稳定性分析,总结十几年来江西高速公路上采用的沥青混合料历程及经验,建议应选用的沥青混合料以及应该采用的措施,为提高沥青路面的高温稳定性、抗车辙变形能力等提供有力保证;通过对近年来省内高速公路上典型沥青路面的建模进行有限元分析,计算得出各结构中与其高温稳定性有关的力学指标(剪应力、剪应变)及其他相关的力学指标的分布、变化规律,同时也分析了目前比较关注的一个问题——沥青碎石柔性基层与路面抗车辙性能的关系,推荐了应优先采用的沥青路面结构。
研究认为,在江西省高速公路沥青路面建设中,为保证沥青路面的高温稳定性并兼顾其他性能,应在材料、集料级配、施工和路面结构组合等方面采用合适措施。沥青结合料应根据PG等级来选择,集料性质应符合规范要求,集料级配应采用粗型密级配(骨架密实型),优先采用AC-C、SMA等类混合料,推荐采用复合基层沥青路面。
当然,应对荷载、不同道路状况、抗剪强度指标、沥青路面车辙的预估等问题作进一步的研究,因条件所限,本课题未深入研究。
In order to deepn the cognitions of mechanical performancesand operating principles in asphalt pavement materials and structural buildups in the unique condition of hot environment in Jiangxi to verify the rationality of exepressway asphalt pavement structures built or would built ,and to submit beneficial recommendations for engineering,in course of the question research ,a series of works on the climate,typical asphalt pavement structures and materials of Jiangxi have been done by means of ordinary computing methods,finite-element program and material trials.
Via studying on climate of every area of Jiangxi,refer to the methods of Eight-Five Study Questions , arrival at the climatic regionalization of Jiangxi Province on asphalt pavement performance,educe the asphalt binder PG(performance grade)which should be attained when aspnalt binder used in every area of Jiangxi Province,by comparing the results attained by referring to methods of SHRP or analyzing with finite-element program;By way of research on high temperature stability for asphalt pavement, summarizing the courses and experiences of adopting asphalt mixtures in Jiangxi expressway constructed in recent years more than ten,recommend better asphalt mixtures and measures in order to offer effective assurance for improving the high temperature stability and resistance to nutting of asphalt pavement, etc.;With the analysis of typical asphalt pavement structures on expressway built in recent years do by finit-element program,find the regularities of distribution and variation of mechnical factors(shear stress,shear strain,etc.)and others concerned with high temperature stability of each and every asphalt pavement structure,at the same time analyze an attention-getting question concerning the relation between asphalt stabilized macadam base course and performances of nutting resistance of asphalt pavement ,introduce the pavement structures be adopted by preference.
It's considered that suitable measures should be adopted in the way of material,aggregate-grading,construction and structure buildup in order to ensure asphalt pavemeant have stronger high temperature stability and others in the construcionof Jiangxi expressway,asphalt,which asphalt binders being chosen in accordance to asphalt PG, aggregate qualities according to criteria,aggregate-grading being corse-close-grained one (close-grained compages),asphalt mixtures such as AC-C,SMA and all that being chosen firstly,and recommend to choose the asphalt pavement with complex base course on espressway.
At the end, the problems about loads,different road conditions,criteria of resistance to shear,beforehand estimate of nutting of asphalt pavement are brought forward ,which requiring further studies .For limited conditions ,these questions haven't been carried on home.
引文
[1]沈金安.沥青及沥青混合料路用性能.北京:人民交通出版社,2001
[2]沈金安,李福普,陈景.高速公路沥青路面早期损坏分析与防治对策.北京:人民交通出版社,2004
[3]孙立军等.沥青路面结构行为理论.北京:人民交通出版社,2005
[4]沈金安.国外沥青路面设计设计总汇(第十篇 美国AASHTO 200X版设计指南修改要点).北京:人民交通出版社,2004
[5]倪富健,徐皓,刘清泉等.排水性沥青表面层半刚性基层路面温度场分析.公路交通科技.2006,Vol.23(10):15～18
[6]陈仕周,倪小军.桥面铺装与温度差异研究.中国公路学报.2005,Vol.18(2):56～60
[7]逯彦秋,张肖宁,王圣保.钢箱梁桥沥青混凝土铺装层温度场的模拟分析.沈阳建筑大学学报(自然科学版).2006,Vol.22(5):750～753
[2]沈金安,李福普,陈景.高速公路沥青路面早期损坏分析与防治对策.北京:人民交通出版社,2004
[3]孙立军等.沥青路面结构行为理论.北京:人民交通出版社,2005
[4]沈金安.国外沥青路面设计设计总汇(第十篇 美国AASHTO 200X版设计指南修改要点).北京:人民交通出版社,2004
[5]倪富健,徐皓,刘清泉等.排水性沥青表面层半刚性基层路面温度场分析.公路交通科技.2006,Vol.23(10):15～18
[6]陈仕周,倪小军.桥面铺装与温度差异研究.中国公路学报.2005,Vol.18(2):56～60
[7]逯彦秋,张肖宁,王圣保.钢箱梁桥沥青混凝土铺装层温度场的模拟分析.沈阳建筑大学学报(自然科学版).2006,Vol.22(5):750～753