摘要
针对逐年提高的路面质量要求和大量的废旧沥青材料浪费的现象,提出将建筑垃圾中的砖、混凝土类细料部分进行碾压、研磨并加工成微纳米级别,并将其作为改性剂加入到基质沥青中,达到改善沥青并减少沥青用量的作用.采用针入度、延度、软化点、黏度和动态剪切流变等试验测试并验证改性沥青的高、低温性能;采用车辙试验、低温弯曲蠕变试验、冻融劈裂试验以及浸水马歇尔试验分别验证改性沥青混合料的高、低温性能和水稳定性.试验结果表明:改性沥青中,微纳米砖混凝土垃圾材料能够改善其高温性能,且在10%掺配比时效果最佳;混合料中,微纳米砖混凝土垃圾材料能显著提高其高温稳定性和水稳定性,其中动稳定度提高60.2%,残留稳定度与劈裂强度比分别提高13.8%和24%.由此可见,微纳米砖混凝土垃圾能够有效提高沥青及其混合料的路用性能.
In order to improve the pavement quality requirements and reduce the waste of waste asphalt materials year by year, the fine parts of bricks and concrete in construction waste are crushed, grinded and processed into micro-nano scale, and as a modifier added to the matrix asphalt. Utilizing the special functions of nanomaterials, asphalt performance is improved and the amount of asphalt is reduced. The penetration, ductility, softening point, viscosity and dynamic shear rheological (DSR) test are used to test and verify the high and low temperature properties of modified asphalt. The rutting test, low temperature bending creep test, freeze-thaw splitting test and water-immersed Marshall test are used to verify the high and low temperature performance and water stability of the modified asphalt mixture. The experimental results show that the micro-nano bricks and concrete waste materials in the modified asphalt mixture can effectively improve its high temperature performance and have the best effect at 10% blending ratio. In the mixture, the micro-nano bricks and concrete waste materials can significantly improve its high temperature stability and water stability, and the dynamic stability is improved by 60.2%, and the residual stability and splitting strength ratio are increased by 13.8% and 24%, respectively. It can be seen that micro-nano bricks and concrete waste can effectively improve the road performance of asphalt and its mixture.
作者
张琛
许辉
尚为公
韩森
ZHANG Chen;XU Hui;SHANG Weigong;HAN Sen(Highway School,Chang′an University,Xi′an 710064,China;Gansu Provincial Highway Administration,Lanzhou 730000,China;Shaanxi Traffic Construction Maintenance Engineering Co.,Ltd.,Xi′an 710064,China)
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2020年第1期53-61,共9页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(51578076)
中央高校基本科研业务费专项资金资助项目(300102219207)
关键词
道路工程
改性沥青
微纳米材料
砖混凝土垃圾
路用性能
road engineering
modified asphalt
micro-nano material
brick and concrete waste
road performance
