水泥重复冷再生基层材料组成设计与耐久性研究

发布时间：2018-04-20 15:10

本文选题：水泥 + 重复冷再生　；参考：《重庆交通大学》2015年硕士论文

【摘要】：我国道路建设由原来的建设阶段逐步过渡到新建与改建、养护与维修同行的新阶段。道路现场冷再生技术因其经济性、环保性得到了道路养护管理部门的高度重视,同时在实际工程中也得到了广泛的应用。随着时间的推移,日趋增多的再生路面将会出现不同程度的破坏或达到其使用寿命。如何对已再生路面进行养护和利用,是否有必要进行重复冷再生,成为公路养护管理部门需要迫切面对的问题。本论文依托2014年贵州省交通厅项目《贵州省山区公路现场重复冷再生技术及耐久性研究》,主要结合贵州铜仁地区和毕节地区沥青路面基层大修工程进行现场重复冷再生技术材料研究。研究内容主要包括贵州地区沥青路面水稳基层重复冷再生原材料技术性质、重复冷再生混合料组成设计与力学性能、重复冷再生混合料疲劳性能等。重复冷再生原材料技术性质方面,分析了铜仁和毕节地区铣刨料集料压碎值、含泥量、针片状含量、密度和含水率等物理力学性能和级配波动的特点,为重复冷再生技术材料研究奠定了基础;再生混合料组成设计方面,针对铜仁和毕节地区的铣刨旧料分别采用添加分档新料和混合料新料两种方式,结合正交试验分析研究水泥剂量、新料添加比例、养生龄期和压实度等因素对再生混合料强度性能的影响规律,从而提出了重复冷再生混合料材料组成设计指标和再生级配范围;疲劳性能方面,采用应力控制模式研究毕节地区重复再生混合料疲劳性能随新料比例和水泥剂量的变化规律,并得到了不同保证率下的疲劳方程。研究结果表明,水泥剂量的增加有助于混合料疲劳性能的改善。相同的水泥剂量和压实度下,当新料添加达到50%时的重复冷再生混合料疲劳性能优于添加30%的混合料。研究主要对重复冷再生混合料基本力学性能指标随新料比例、水泥剂量和养生龄期等因素的变化进行了分析,下一步拟从再生集料表面缺陷的角度研究再生混合料路用性能的衰变规律。
[Abstract]:The road construction of our country is gradually transitioning from the original construction stage to the new stage of new construction and reconstruction, maintenance and maintenance. Because of its economy and environmental protection, the road field cold regeneration technology has been attached great importance by the road maintenance and management department, and has also been widely used in practical engineering. With the passage of time, the increasing number of recycled pavement will appear varying degrees of damage or reach its service life. How to maintain and utilize the recycled pavement and whether it is necessary to carry out repeated cold regeneration has become an urgent problem for the highway maintenance and management department. Based on the project of Guizhou Provincial Traffic Department in 2014 < Technology and durability of repeated Cold Regeneration of Highway in Guizhou Mountain area in 2014, this paper mainly combines with the asphalt pavement base course overhaul project in Tongren and Bijie areas of Guizhou Province to carry out site repetition. Study on Cold Recycling Technology Materials. The main contents of the research include the technical properties of recycled raw materials, the composition design and mechanical properties of reclaimed cold recycled mixture, the fatigue performance of repeated cold recycled mixture, and so on. In terms of technical properties of recycled raw materials, the characteristics of physical and mechanical properties and gradation fluctuation of milling and planing aggregates in Tongren and Bijie areas, such as crushing value, mud content, needle sheet content, density and moisture content, are analyzed. In the aspect of composition design of recycled mixture, two ways of adding graded new material and new mixture material are used for milling and planing old materials in Tongren and Bijie areas, respectively. Combined with orthogonal test, the influence of cement dosage, proportion of new material, health age and compaction on the strength performance of recycled mixture was studied. In the aspect of fatigue performance, the fatigue performance of repeated recycled mixture in Bijie area is studied by using stress control mode with the ratio of new materials and cement dosage. The fatigue equations under different guarantee rates are obtained. The results show that the increase of cement dosage is helpful to improve the fatigue performance of mixture. Under the same cement dosage and compaction, the fatigue performance of the reclaimed cold recycled mixture is better than that of the mixture with 30% addition when the new material reaches 50%. The changes of basic mechanical properties of repeated cold recycled mixture with the ratio of new material, cement dosage and health age were analyzed. The next step is to study the decay law of road performance of recycled aggregate from the point of view of surface defects of recycled aggregate.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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