摘要
为了真实准确地评价沥青路面就地热再生工程的应用效果,采用路面现场钻取的芯样对再生路面的材料性能进行评价。与同一路段的铣刨重铺路面进行对比,在再生路面通车1~2年后于不同车辙深度的断面钻取路面芯样。通过开展抽提筛分、马歇尔稳定度和劈裂强度等试验研究,对再生路面的材料组成、高温稳定性和抗开裂性能进行综合评价。研究结果表明:与铣刨重铺路面相比,再生路面的矿料级配偏细,油石比偏大,尤其是0.075 mm筛孔通过率超出AC-13沥青混合料的级配上限;铣刨重铺路面的马歇尔稳定度与再生路面相当,但是下承层较低的马歇尔稳定度导致铣刨重铺路面的车辙深度大于再生路面;再生路面的劈裂强度整体上小于铣刨重铺路面,与再生路面的沥青老化较严重,抗开裂性能衰减程度较大有关。
In order to accurately evaluate the application effect of hot in-place recycling engineering for asphalt pavement,the material performance of recycled pavement was evaluated by using coring samples drilled on site.Compared with milling-repaving pavement of the same road section,coring samples were drilled in the sections with different rutting depth after 1~2 years operation of recycled pavement.The material composition,high temperature stability and anti-cracking performance of recycled pavement were comprehensively evaluated by carrying out experiments on extracting-sieving,Marshall stability and splitting strength.Research results show that compared with milling-repaving pavement,the mineral aggregate gradation of recycled pavement is finer and the asphalt content is larger,especially the passing rate of 0.075 mm sieve exceeds the upper limit of gradation range for AC-13 asphalt mixture.The Marshall stability of milling-repaving pavement is similar to recycled pavement,but lower Marshall stability of the underlying layer causes rutting depth of milling-repaving pavement to be greater.On the whole,the splitting strength of recycled pavement is less than milling-repaving pavement,relating to the more serious degree of asphalt aging and anti-cracking performance attenuation.
作者
李俊
李明亮
武昊
LI Jun;LI Ming-liang;WU Hao(Research Institute of Highway Ministry of Transport,Beijing 100088,China)
出处
《筑路机械与施工机械化》
2020年第10期24-28,共5页
Road Machinery & Construction Mechanization
基金
江苏省交通运输科技项目(2019Y04)。
关键词
道路工程
就地热再生
路面芯样
工程应用效果
road engineering
hot in-place recycling
pavement coring sample
engineering application effect
