高黏乳化沥青砂封层的配合比设计研究

摘要

For the extensive application of the high-viscosity-emulsion-asphalt-sand-seal technology,the mix design is studied.Firstly,6 samples of emulsified asphalt with different viscosities and solid content are made.Secondly,Meclod method is used to calculate the theory spraying amount of emulsified asphalt and the machine-made sand,then the single particle size grading mechanism of sand isdetermined according to the experiment.Based on this,the theoretical spray amount is adjusted through the stone-off-rate test,anti-sliding performance test and sand-sealing test.Finally,combined with the test results and actual construction experience,the mix design of high-viscosityemulsion-asphalt-sand seal is given.In the high-viscosity-emulsion-asphalt-sand seal,the solid content of the emulsion asphalt should be 70％,Enge La viscosity is 10 and the spraying amount is 1.1 kg/m2.The single particle size of aggregate of the machine-made is 2.36-4.75 mm and the spraying amount is 6.7 kg/m2.%目的 对高黏乳化沥青砂封层的配合比设计进行研究,使高黏乳化沥青砂封层技术广泛地应用到实际工程中.方法 先制备6种不同固含量和恩格拉黏度的乳化沥青样品,再利用Meclod法计算出乳化沥青和机制砂的理论洒布量并根据试验确定机制砂的单一级配粒径.通过脱石率试验、抗滑性能试验、砂封层渗水性能等试验对理论洒布量进行调整,综合试验所得结果和实际施工中的相关影响因素.结果 高黏乳化沥青砂封层的配合比宜选用固含量为70％,恩格拉黏度为10的乳化沥青样品,洒布量为1.1 kg/m2,机制砂选用2.36～4.75 mm单一粒径集料,洒布量宜为6.7 kg/m2.结论 通过试验最终得到了高黏乳化沥青砂封层的最佳配合比,为工程实践研究提供了理论数据.