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道路养护吸能封层增韧缓力功效评价 被引量:1

Evaluation of Toughening and Buffering Effects of Road Maintenance Energy-absorbing Seal
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摘要 为科学评价道路养护吸能封层增韧缓力功效,促进吸能材料在道路养护领域的拓展应用,以路用吸能材料为载体制备了道路养护吸能封层,基于冲击韧性试验和数字图像相关技术,评价了道路养护吸能封层对旧路面的增韧效果;提出了基于行车荷载连续加载的路面封层缓力功能测试与评价方法,全面分析了道路养护吸能封层与沥青加铺层、水性环氧乳化沥青微表处、水性环氧树脂雾封层等不同高性能路面养护方案对普通沥青混凝土板底部应变变化规律的影响,探明了道路养护吸能封层耐荷缓力效果,揭示了旧路面开裂状况与荷载等级对道路养护吸能封层缓力功能的影响规律。结果表明:瞬时冲击荷载作用下,道路养护吸能封层可使沥青混合料试件表面Mises应力降低30%~40%,冲击韧性值提升约40%,可达2000 N·mm;连续行车荷载作用下,道路养护吸能封层可使沥青混凝土板底部所受纵、横向拉应变均大幅降低,甚至转化为压应变,有效缓解应力集中;基于5 cm沥青混凝土底板,3 mm道路养护吸能封层可有效消减其50%以上的纵、横向拉应变,且加载时间越长,效果越明显;3 mm吸能封层的缓力功能稳定性与受力均匀性优于5 cm沥青加铺层,能够均匀消减沥青混凝土板不同位置的应变;在横向开裂工况条件下,吸能封层仍可保持良好缓力功能;重载作用下,吸能封层能够消减沥青板底应变50%~60%,缓力效果稳定。上述结果将为道路养护吸能封层的深入探索与推广应用奠定坚实基础。 We scientifically evaluated the toughening and buffering effects of a road maintenance energy-absorbing seal to promote the expansion and application of energy-absorbing materials in road maintenance.The road maintenance energy-absorbing seal was prepared using road energy-absorbing materials as the carrier.Based on an impact toughness test and digital image correlation technology,the toughening effect of the seal on an old pavement was evaluated.A method to test and evaluate the buffering function of the pavement seal based on the continuous loading of the driving load was proposed.The impact of different high-performance pavement maintenance schemes such as the proposed seal,asphalt overlay layer,waterborne epoxy emulsified asphalt micro surface,and waterborne epoxy resin fog seal on the strain change law at the bottom of ordinary asphalt concrete plate was comprehensively analyzed.The load-bearing and buffering effect of the proposed seal was explored.The influence of the cracking condition and old pavement load on the buffering function of the proposed seal was revealed.The results showed that under instantaneous impact load,the proposed seal can reduce the Mises stress on the surface of asphalt mixture specimen by 30%to 40%,and increase the impact toughness by approximately 40%,up to 2000 N·mm.Under continuous driving loads,the energy-absorbing seal can significantly reduce the longitudinal and transverse tensile strains on the bottom of the asphalt concrete plate,and even convert them into compressive strains,effectively alleviating stress concentration.Based on the asphalt concrete base plate with a thickness of 5 cm,the proposed seal with a thickness of 3 mm can effectively reduce the longitudinal and transverse tensile strains by more than 50%.The longer the loading time,the more the effect.The stability and force uniformity of the seal with a thickness of 3 mm are better than those of an asphalt overlay layer with a thickness of 5 cm,thus uniformly reducing the strain at different positions of the asph
作者 陈谦 王朝辉 李彦伟 冯雷 刘伟 CHEN Qian;WANG Chao-hui;LI Yan-wei;FENG Lei;LIU Wei(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;Taihang Urban and Rural Construction Group Co,Ltd.,Shijiazhuang 050090,Hebei;Shandong Hi-speed Transportation Construction Group Co.Ltd.,Jinan 250101,Shandong,China)
出处 《中国公路学报》 EI CAS CSCD 北大核心 2023年第12期249-262,共14页 China Journal of Highway and Transport
基金 国家自然科学基金项目(52378429) 陕西省创新能力支撑计划项目(2022TD-07) 陕西省博士后科研项目(2023BSHYDZZ120) 太行城乡建设集团有限公司科技项目(KT-2) 山东高速集团有限公司科技项目(2019QL07)。
关键词 路面工程 吸能封层 评价 增韧 缓力 pavement engineering energy-absorbing seal evaluation toughening buffering
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  • 1《中国公路学报》编辑部,董侨,杜豫川,郭猛,黄优,贾彦顺,蒋玮,金娇,李峰,刘成龙,刘鹏飞,刘状壮,罗雪,吕松涛,马涛,沙爱民,单丽岩,司春棣,王朝辉,王大为,肖月,徐慧宁,杨旭,张久鹏,张园,朱兴一.中国路面工程学术研究综述·2024[J].中国公路学报,2024,37(3):1-81. 被引量:10

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