贵州山区道路现场冷再生施工工艺及质量控制
发布时间：2018-08-29 13:06
【摘要】：水泥就地冷再生技术造价低廉、施工方便,可广泛应用于旧路改建和大修工程。本文依托贵州省交通厅科技项目《贵州省山区公路现场冷再生与重复冷再生技术应用研究》,以铜仁地区和毕节地区为代表,结合铜仁S305线省道大修工程和毕节地区102省道、G326国道改扩建工程,通过室内试验、现场试验及铺筑试验路,对贵州一次及二次冷再生施工工艺及质量控制进行研究。通过室内试验对两个地区旧基层材料进行了性能分析,包括旧料级配和旧料的物理力学性能以及一次再生料级配。采用改变新添料比例和水泥剂量的试验方案,通过击实试验和无侧限抗压强度试验,分别针对两个地区水泥再生基层混合料进行了配合比设计。研究了一次再生混合料无侧限抗压强度、劈裂强度及抗压回弹模量的变化规律。针对铜仁地区再生基层路面工程,研究了冷再生机施工参数和碾压工艺。通过研究WB525冷再生机转子转速和行进速度对一次再生料级配的影响,确定了其参数。针对两台20T压路机,研究了静压、弱振和强振三种碾压方式下碾压遍数与压实度的关系;针对普通路段和过境路段分别进行了四种碾压方式和两种碾压方式的现场试验,得到两种路段的碾压工艺。最后通过铺筑试验路,对一次再生施工工艺进行了验证,同时提出了质量控制指标。针对毕节地区再生基层路面工程,对WR2500S冷再生机施工工艺及碾压工艺进行调研,当冷再生机转子转速设置在110转/min~140转/min,行进速度设置为10 m/min~15m/min,满足一次再生级配要求;而碾压工艺需要进一步研究。通过一次再生试验路,对水泥摊铺工艺和碾压工艺进行了优化,得到了“22T压路机+25T压路机”在两种路段的碾压工艺,并提出了质量控制指标。通过现场调研,推荐二次冷再生工艺:WR2500S冷再生机转子转速为150转/min~170转/min,行进速度为3 m/min~5m/min;碾压工艺可参考一次再生。与传统施工工艺相比,水泥稳定基层就地冷再生技术经济效益和环境效益显著。论文研究表明:基层施工一公里,采用就地冷再生技术降低费用20万以上,碳排放量减少4t以上。
[Abstract]:The technology of local cold regeneration of cement is cheap and easy to construct, and can be widely used in old road reconstruction and overhaul projects. Based on the scientific and technological project of Guizhou Provincial Communications Department, "the Application of Cold Recycling and repeated Cold Recycling Technology in Guizhou Mountain Highway", represented by Tongren region and Bijie area, Combined with the overhaul project of Tongren S305 provincial road and the reconstruction and extension project of 102 provincial highway G326 in Bijie area, through indoor test, field test and paving test road, the construction technology and quality control of primary and secondary cold regeneration in Guizhou are studied. The properties of the old base materials in two regions were analyzed through laboratory tests, including the gradation of the used materials, the physical and mechanical properties of the used materials and the gradation of the primary recycled materials. Through compaction test and unconfined compressive strength test, the mix ratio design of cement recycled base mixture in two areas was carried out by changing the proportion of new material and cement dosage. The variation of unconfined compressive strength, splitting strength and modulus of compressive resilience of primary recycled mixture is studied. Based on the pavement engineering of recycled base in Tongren area, the construction parameters and rolling technology of cold regenerator are studied. The influence of rotor speed and travel speed of WB525 cold regenerator on the gradation of primary regeneration material is studied and its parameters are determined. For two 20T roller compactors, the relationship between the number of compaction times and compaction degree under three rolling modes of static compaction, weak vibration and strong vibration is studied, and the field tests of four kinds of rolling modes and two kinds of rolling methods are carried out for the common road sections and the transit road sections, respectively. The rolling process of two kinds of road sections is obtained. Finally, the primary regeneration construction technology is verified by paving the test road, and the quality control index is put forward at the same time. In view of the road surface engineering of regenerative base course in Bijie area, the construction technology and rolling technology of WR2500S cold regenerator are investigated. When the rotor speed of cold regenerator is set at 110rpm / min-140rpm / min, the traveling speed is set to 10m / min / 15m / min, which meets the requirement of primary regeneration gradation. The rolling process needs further study. Through a regenerative test road, the cement spreading process and rolling process were optimized, and the rolling process of "22T roller 25T roller" in two sections was obtained, and the quality control index was put forward. Based on field investigation, it is recommended that the rotor speed of the 10 WR2500S cold regenerator is 150 rpm / min 170 / min, and the travel speed is 3 m / min / min ~ 5 m / min; the rolling process can be referred to as primary regeneration. Compared with the traditional construction technology, the economic and environmental benefits of local cold regeneration technology of cement stabilized base are remarkable. The research results show that the cost of local cold regeneration is reduced by more than 200000 and the carbon emission is reduced by more than 4 tons for one kilometer of base course construction.
【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】：U418.6
[Abstract]:The technology of local cold regeneration of cement is cheap and easy to construct, and can be widely used in old road reconstruction and overhaul projects. Based on the scientific and technological project of Guizhou Provincial Communications Department, "the Application of Cold Recycling and repeated Cold Recycling Technology in Guizhou Mountain Highway", represented by Tongren region and Bijie area, Combined with the overhaul project of Tongren S305 provincial road and the reconstruction and extension project of 102 provincial highway G326 in Bijie area, through indoor test, field test and paving test road, the construction technology and quality control of primary and secondary cold regeneration in Guizhou are studied. The properties of the old base materials in two regions were analyzed through laboratory tests, including the gradation of the used materials, the physical and mechanical properties of the used materials and the gradation of the primary recycled materials. Through compaction test and unconfined compressive strength test, the mix ratio design of cement recycled base mixture in two areas was carried out by changing the proportion of new material and cement dosage. The variation of unconfined compressive strength, splitting strength and modulus of compressive resilience of primary recycled mixture is studied. Based on the pavement engineering of recycled base in Tongren area, the construction parameters and rolling technology of cold regenerator are studied. The influence of rotor speed and travel speed of WB525 cold regenerator on the gradation of primary regeneration material is studied and its parameters are determined. For two 20T roller compactors, the relationship between the number of compaction times and compaction degree under three rolling modes of static compaction, weak vibration and strong vibration is studied, and the field tests of four kinds of rolling modes and two kinds of rolling methods are carried out for the common road sections and the transit road sections, respectively. The rolling process of two kinds of road sections is obtained. Finally, the primary regeneration construction technology is verified by paving the test road, and the quality control index is put forward at the same time. In view of the road surface engineering of regenerative base course in Bijie area, the construction technology and rolling technology of WR2500S cold regenerator are investigated. When the rotor speed of cold regenerator is set at 110rpm / min-140rpm / min, the traveling speed is set to 10m / min / 15m / min, which meets the requirement of primary regeneration gradation. The rolling process needs further study. Through a regenerative test road, the cement spreading process and rolling process were optimized, and the rolling process of "22T roller 25T roller" in two sections was obtained, and the quality control index was put forward. Based on field investigation, it is recommended that the rotor speed of the 10 WR2500S cold regenerator is 150 rpm / min 170 / min, and the travel speed is 3 m / min / min ~ 5 m / min; the rolling process can be referred to as primary regeneration. Compared with the traditional construction technology, the economic and environmental benefits of local cold regeneration technology of cement stabilized base are remarkable. The research results show that the cost of local cold regeneration is reduced by more than 200000 and the carbon emission is reduced by more than 4 tons for one kilometer of base course construction.
【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】：U418.6
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