全深式水泥稳定就地冷再生基层应用与耐久性能评价
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摘要
为了将含有回收沥青路面材料及回收基层材料的废旧路面材料就地水泥冷再生后用于高速公路的基层,并能在短期内快速评价水泥就地冷再生基层的耐久性能,进行了大广高速奈曼东连接线全深式水泥稳定就地冷再生基层和骨架密实型水泥稳定碎石基层的劈裂强度、无侧限抗压强度、弯拉强度、动态压缩模量(中间段法)、干缩温缩应变、冻融循环水稳定性与抗疲劳耐久性等的对比研究,进而采用足尺加速加载试验评价了全深式水泥稳定就地冷再生基层的长期使用性能。研究结果表明,全深式水泥稳定就地冷再生混合料的7d无侧限抗压强度、弯拉强度、动态压缩模量完全能满足规范中高速公路基层的要求;相同试验条件下,水泥稳定就地冷再生混合料的强度特性、力学性能、抗冻性及疲劳寿命均小于骨架密实型水泥稳定碎石混合料,但2种半刚性基层的承载能力相差不大;在持续荷载作用下,路面基层疲劳损伤累积会导致其承载能力不断衰减,随着试验轮加载次数增大,2种半刚性基层弯沉代表值持续增大,而弯沉增长率呈先显著增大后趋于平稳的变化趋势,全深式水泥稳定就地冷再生基层的承载能力衰减对重复荷载作用更加敏感。足尺加速加载试验加载了120万次后,全深式水泥稳定就地冷再生基层未发生疲劳开裂病害,也表现出了良好的耐久性能;建议改扩建工程中,宜将全深式水泥稳定就地冷再生基层应用于交通量较小的车道方向。
In order to reclaim the waste pavement materials containing recycled asphalt pavement material and recycled base material which is to be used for the base layer of expressway after cold regeneration,and to quickly evaluate the durability performance of cold regenerated base layer of cement in a short term,comparisons and studies in terms of the durability,the splitting strength,unconfined compressive strength,bending strength,dynamic compression modulus test(middle section method),dry shrinkage and thermal shrinkage strain,freeze-thaw cycle water stability and fatigue durability are carried out based on the full-deep cement stabilized in-situ cold-recycled base layer and the skeleton-compacted cement stabilized macadam base layer of the Naiman East Access Line of the Daqing-Guangzhou Expressway,and then the long-term performance of the full-scale cement stabilized in-situ cold regenerated base layer is evaluated by full-scale accelerated loading test.The study results show that the 7 dunconfined compressive strength,bending strength and dynamic compressive modulus of the full-deep cement stabilized in-situ cold recycled mixture can fully meet the requirements of the highway base layer in the specification;under the same test conditions,the strength characteristics,mechanical properties,frost resistance and fatigue life of the in-situ cold recycled mixture are smaller than the skeleton compact cement stabilized macadam mixture,but the bearing capacity of the two semi-rigid base layers is not much different;under actions of continuous loading,the fatigue damage accumulation of the pavement base layer will lead to the continuous decline of its bearing capacity.As the number of test wheel loading increases,the representative value of the two semi-rigid base layers continues to increase,while the growth rate of the deflection increases significantly and then stabilizes.The full-deep cement stabilized in-situ coldrecycled base layer with reduced bearing capacity is more sensitive to repeated loads.After the full-scale accelerated loading test is loaded 1.2 million times,the full-deep cement stabilized in-situ cold regenerated base layer doesn't occur fatigue cracking and shows good durability.It is recommended to apply the fulldeep cement stabilized in-situ cold regenerated base course in the lanes with less traffic volume in reconstruction and extension projects.
In order to reclaim the waste pavement materials containing recycled asphalt pavement material and recycled base material which is to be used for the base layer of expressway after cold regeneration,and to quickly evaluate the durability performance of cold regenerated base layer of cement in a short term,comparisons and studies in terms of the durability,the splitting strength,unconfined compressive strength,bending strength,dynamic compression modulus test(middle section method),dry shrinkage and thermal shrinkage strain,freeze-thaw cycle water stability and fatigue durability are carried out based on the full-deep cement stabilized in-situ cold-recycled base layer and the skeleton-compacted cement stabilized macadam base layer of the Naiman East Access Line of the Daqing-Guangzhou Expressway,and then the long-term performance of the full-scale cement stabilized in-situ cold regenerated base layer is evaluated by full-scale accelerated loading test.The study results show that the 7 dunconfined compressive strength,bending strength and dynamic compressive modulus of the full-deep cement stabilized in-situ cold recycled mixture can fully meet the requirements of the highway base layer in the specification;under the same test conditions,the strength characteristics,mechanical properties,frost resistance and fatigue life of the in-situ cold recycled mixture are smaller than the skeleton compact cement stabilized macadam mixture,but the bearing capacity of the two semi-rigid base layers is not much different;under actions of continuous loading,the fatigue damage accumulation of the pavement base layer will lead to the continuous decline of its bearing capacity.As the number of test wheel loading increases,the representative value of the two semi-rigid base layers continues to increase,while the growth rate of the deflection increases significantly and then stabilizes.The full-deep cement stabilized in-situ coldrecycled base layer with reduced bearing capacity is more sensitive to repeated loads.After the full-scale accelerated loading test is loaded 1.2 million times,the full-deep cement stabilized in-situ cold regenerated base layer doesn't occur fatigue cracking and shows good durability.It is recommended to apply the fulldeep cement stabilized in-situ cold regenerated base course in the lanes with less traffic volume in reconstruction and extension projects.
引文
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[12]师郡,陈志喜,帅领.旧沥青混凝土路面现场冷再生技术及施工工艺研究[J].公路,2014,58(10):167-170.
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[14]中国路桥技术有限公司.JTG D50-2017公路沥青路面设计规范[S].北京:人民交通出版社,2017.
[2]郝增恒,兰超,周启伟.复合式冷再生基层设计理念与实施[J].公路交通科技,2011,28(12):41-46.
[3]武建民,宗炜.水泥稳定二次再生路面材料性能[J].长安大学学报:自然科学版,2011,31(5):7-11.
[4]马君毅.冷再生旧沥青路面材料在基层中的应用[D].西安:长安大学,2015.
[5]交通运输部公路科学研究院.JTG F41-2008公路沥青路面再生技术规范[S].北京:人民交通出版社,2008.
[6]郭寅川,申爱琴,张名成.沥青路面复合式冷再生基层混合料路用性能影响因素[J].公路交通科技,2014,31(7):32-38.
[7]张名成.沥青路面改建结构设计与复合式冷再生技术研究[D].西安:长安大学,2011.
[8]吴文飞,何锐,陈华鑫.旧沥青路面全深式冷再生基层材料力学性能[J].广西大学学报:自然科学版,2016,41(1):253-260.
[9]樊统江,赵磊.就地复合冷再生路面设计参数及工艺参数[J].土木建筑与环境工程,2010,32(4):49-57.
[10]马松林,余礼昌,李雷.全深式冷再生材料温缩试验与分析[J].低温建筑技术,2011,12(2):8-11.
[11]蒋应军,沈彬,陈冠希.垂直振动压实水泥冷再生混合料劈裂强度特性[J].长安大学学报:自然科学版,2016,36(2):9-18.
[12]师郡,陈志喜,帅领.旧沥青混凝土路面现场冷再生技术及施工工艺研究[J].公路,2014,58(10):167-170.
[13]交通运输部公路科学研究院.JTG/T F20-2015公路路面基层施工技术细则[S].北京:人民交通出版社,2015.
[14]中国路桥技术有限公司.JTG D50-2017公路沥青路面设计规范[S].北京:人民交通出版社,2017.