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基于旧水泥混凝土再生集料的耐久性半刚性基层性能及设计参数的应用研究
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摘要
针对目前越来越多的旧水泥混凝土路面维修所产生的大量的废弃的旧水泥混凝土材料且占用土地污染环境,以及旧水泥路面改造中的旧水泥混凝土面板的材料再生利用的问题,采用全面深入的试验研究并铺筑试验路段现场验证以及性能预测分析的方法,通过对旧水泥混凝土板的破碎加工,再生集料的物理和力学性能评价,基于旧水泥混凝土再生集料的耐久性半刚性基层性能及设计参数的应用研究,基于多指标的耐久性水泥稳定再生集料的设计和三阶段设计方法的耐久性再生集料半刚性基层沥青路面结构设计,以及试验段路面结构性能预测分析,获得了基于旧水泥混凝土再生集料的耐久性半刚性基层性能及设计参数的应用研究技术。论文的主要工作和创新成果如下:
     1、首次全面翔实地结合原路面施工单位的水泥混凝土原材料物理和力学性能、配合比等试验资料与现行的水泥稳定碎石的原材料物理和力学性能、级配等技术指标进行对比分析。通过选取有代表性的旧混凝土路面板进行室内小规模破碎,检测再生集料的路用性能(级配、颗粒形状),并与工厂化破碎加工的再生集料进行对比分析,评价再生集料路用性能及旧水泥混凝土板破碎再生集料利用的可行性、经济性以及不同岩性的再生集料的差异性,全面研究了破碎工艺对集料路用性能的影响。
     2、对水泥稳定再生集料的设计参数与路用性能进行了全面深入的研究,得出设计参数、路用性能的内在规律以及它们之间内在联系的关系式;首次采用干湿循环试验和干湿强度系数对水泥稳定再生集料的水稳定性和耐久性进行研究,提出了抗裂性能设计指标,进行了基于设计参数和干温缩开裂、疲劳、水稳性、耐久性等路用性能多指标体系的耐久性水泥稳定再生集料的设计,提出耐久性水泥稳定再生集料设计参数。
     3、针对再生集料半刚性基层沥青路面在使用过程中所表现的发展行为,采用三阶段设计方法进行耐久性再生集料半刚性基层沥青路面结构设计,给出了相应的设计方法。
     4、通过铺筑试验路,得出了旧水泥混凝土板破碎加工和水泥稳定旧水泥混凝土再生集料的施工控制工艺,结合现场检测的路用性能及设计参数,采用AASHTO的M-EPDG软件,以增量叠加的思想预测水泥稳定再生集料半刚性基层沥青路面结构在15年内的性能变化。
     5、首次从材料的可行性,破碎加工工艺,配合比设计,设计参数与路用性能的综合研究,基于多指标耐久性水泥稳定再生集料的设计,耐久性再生集料半刚性基层沥青路面结构设计,现场规模化再生集料生产以及水泥稳定再生集料的施工控制和再生集料半刚性基层沥青路面结构性能预测分析等方面,综合全面地进行了系统性应用研究,所获得的研究成果为推动资源循环再生利用、环保、可持续发展,以及为大规模工业化加工生产旧混凝土再生集料应用于耐久性半刚性基层沥青路面中提供了强有力的技术支撑。
Focusing on the problems of large amounts of waste of old cement concrete materialsand land pollution to the environment due to the disposal of old concrete slabs, the recyclingissues of concrete slabs in the process of rehabilitation of old concrete pavement, acomprehensive and in-depth study of using recycled concrete aggregate (RCA) as semi-rigidbase for asphalt pavement was performed in this study. It evaluated breaking process of oldconcrete slabs, physical and mechanical properties of RCA. Through experimental road testand numerical performance prediction, a structural design methodology for using RCA assemi-rigid base for asphalt pavement was developed based on multiple pavement performanceindexes and three stage design method. The main work and innovation are summarized asfollows:
     1. For the first time ever, a comprehensive coMParison analysis was conducted betweenoriginal concrete pavement material and the existing specifications of cement stabilized gravelin terms of physical and mechanical performance of raw materials, gradation and mixtureproperties. Typical old concrete slabs were selected for indoor breaking test to evaluate theperformance (gradation and shape) of recycled concrete aggregate (RCA). A CoMParisonbetween in-situ RCA and manufactured RCA was performed to evaluate the performance,feasibility and economy of using RCA as semi-rigid base. The difference between differentRCA due to the different source of virgin aggregate was also evaluated. In addition, it alsothoroughly studied the effect of breaking process on the performance of RCA
     2. Through comprehensive study on the design parameters and pavement performance ofthe cement stabilized recycled aggregate base, the mathematical relationship between thedesign parameters and pavement performance was developed. The dry-wet cycle test anddry-wet strength coefficient was first used to study the moisture stability and durability of thecement stabilized aggregate and a design criteria against cracking was developed. Design parameters for durable cement stabilized recycled aggregate were proposed based on multiplepavement performance indexes in terms of thermal cracking, fatigue, moisture stability anddurability.
     3. According to the performance characteristics of asphalt pavement based on recycledconcrete aggregate (RCA) as semi-rigid base, a structural design methodology is proposedusing three stage design methods.
     4. Through experimental road test, the quality control for crushing old concretepavement and stabilizing recycled concrete aggregate is developed. With the support of in-situpavement performance testing data and design parameters, a15-year performance curve ispredicted for asphalt concrete pavement using RCA as semi-rigid base based on AASHTOM-E PDG program using the principle of incremental superposition.
     5. For the first time ever, a systemic and comprehensive study is carried on thesemi-rigid base asphalt pavement using RCA in terms of the material constructability,crushing process, mix design, the comprehensive properties of the design parameters andpavement performance, aggregate index of durability of cement stabilized recycled concreteaggregate, the design of semi-rigid base asphalt pavement structure, field recycling of oldconcrete pavement in large scale, quality control of cement stabilized recycled aggregate, andperformance prediction of semi-rigi base asphalt pavement based on RCA. The results of thestudy will provide a strong technical support for promoting renewable resources,environmental protection, sustainable development and the large-scale industrializedproduction of recycling old concrete as aggregate used in the semi rigid base asphaltpavement.
引文
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