公路路面水泥稳定就地冷再生关键技术与工程应用研究

发布时间：2018-06-14 09:12

本文选题：水泥稳定 + 就地冷再生　；参考：《浙江大学》2015年硕士论文

【摘要】：采用水泥作为稳定剂,通过再生设备对旧基层材料进行现场再生利用是一项先进的道路维修技术,本文通过围绕工程实践中遇到的关键技术问题,开展室内试验和工程应用研究。首先根据旧路面材料的特点,分析水泥稳定冷再生旧路面材料强度形成原理,探讨影响水泥稳定冷再生旧路面材料性能的因素；对水泥稳定冷再生混合料所用的原材料性质进行分析和评价,认为旧沥青混凝土含量和混合料级配是影响水泥稳定再生混合料关键路用性能指标的主要因素。基于旧沥青混凝土掺量和老化程度的不同,发现水泥稳定冷再生混合料表现出以下规律：当沥青老化不严重时,掺入较高含量的旧沥青混凝土会降低再生材料各龄期的抗压强度、劈裂强度、回弹模量和稳定性,并使得再生混合料的温度敏感性变大；相反,掺入较高含量的旧沥青混凝土会适当改善再生材料的抗冲刷性能和干缩性能。基于混合料级配的不同,发现水泥稳定冷再生混合料表现出以下规律：旧半刚性基层材料级配通过添加碎石后,级配得到了改善,形成骨架密实型结构,会增大材料的整体密实度,降低最佳含水率,显著增加混合料的抗压强度、劈裂强度和抗压回弹模量,改善混合料的稳定性、抗冲刷性能和抗干缩性能；最后依据再生材料组成的不同,首次提出了水泥稳定再生材料应用条件与场合。根据前面的室内理论研究和以往工程经验,结合就地再生技术的特点,提出了水泥稳定冷再生混合料的设计方法,强调了旧路面材料的具体取样方法、原材料分析、级配设计和成型方法。通过对多个就地冷再生项目施工情况调研,参考国内外有关成熟工程应用经验,提出水泥就地再生施工工艺原理、关键设备要求、就地冷再生施工工艺流程和质量控制方法、施工过程质量检查和工程质量验收标准。依托水泥就地冷再生半刚性基层技术在G330温寿线建德段和S229龙后线龙泉段的具体应用,介绍了老路状况、维修方案、施工准备、试验段施工成果、施工效果观测和分析,以及对项目的经济和社会效益分析,最后依据就地冷再生项目工程应用情况调研,归纳了就地冷再生应用的基本经验。
[Abstract]:It is an advanced road maintenance technology to use cement as stabilizer and recycle the old base course material by recycling equipment. This paper discusses the key technical problems encountered in engineering practice. Carry out indoor test and engineering application research. Firstly, according to the characteristics of old pavement materials, the forming principle of cement stabilized cold recycled old pavement materials is analyzed, and the factors that affect the performance of cement stabilized cold recycled old pavement materials are discussed. The properties of raw materials used in cement stabilized cold recycled mixture are analyzed and evaluated. It is considered that the content of old asphalt concrete and mixture gradation are the main factors affecting the key road performance index of cement stabilized recycled mixture. Based on the difference of the amount of old asphalt concrete and the degree of aging, it is found that the cement stabilized cold recycled mixture shows the following rules: when the asphalt aging is not serious, The addition of high content of old asphalt concrete reduces the compressive strength, splitting strength, modulus of resilience and stability of recycled materials at different ages, and increases the temperature sensitivity of recycled mixtures. The scour resistance and dry shrinkage of recycled materials can be improved by adding high content of old asphalt concrete. Based on the different gradation of the mixture, it is found that the cement stabilized cold recycled mixture shows the following rules: the gradation of the old semi-rigid base material is improved by adding crushed stone, and the skeleton dense structure is formed. It will increase the overall compactness of the material, reduce the optimum moisture content, increase the compressive strength, split strength and compressive resilience modulus of the mixture, improve the stability, scour resistance and dry-shrinkage resistance of the mixture. Finally, according to the different composition of recycled materials, the application conditions and applications of cement stabilized regenerated materials are put forward for the first time. According to the previous indoor theoretical research and previous engineering experience, combined with the characteristics of in-situ recycling technology, the design method of cement stabilized cold recycled mixture is put forward, and the concrete sampling method and raw material analysis of the old pavement material are emphasized. Grading design and molding methods. Based on the investigation and investigation of the construction situation of several local cold regeneration projects and referring to the domestic and foreign mature engineering application experience, the paper puts forward the construction technology principle, key equipment requirements, local cold recycling construction process and quality control method. Construction process quality inspection and engineering quality acceptance standards. Based on the concrete application of cement in situ cold regeneration semi-rigid base course technology in Jiande section of G330 Wenshou line and Longquan section of S229 Longhou line, this paper introduces the old road condition, maintenance scheme, construction preparation, construction results of test section, observation and analysis of construction effect. The economic and social benefits of the project are analyzed. Finally, based on the investigation and investigation of the local cold regeneration project, the basic experience of the local cold regeneration application is summarized.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2

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