纳米氧化锌改性沥青混合料性能分析

发布时间：2018-08-24 10:23

【摘要】：为探究纳米氧化锌改性沥青混合料的路用性能,首先应用高速剪切法制备1%、2%、3%、4%、5%、6%、7%七种剂量纳米氧化锌改性沥青,通过基质沥青与7种改性沥青基本性能的对比分析,优选出1%、4%、7%三种剂量纳米氧化锌改性沥青进行DSR试验、BBR试验和布洛克菲尔德黏度计法试验,分析纳米氧化锌改性沥青路用性能。其次,通过车辙试验、浸水马歇尔试验、冻融劈裂试验和低温弯曲试验系统分析沥青混合料的路用性能,并应用红外光谱法从微观角度分析其改性机理。结果表明:1%、4%、7%三种剂量的纳米氧化锌改性沥青均能有效改善沥青的高温、低温、黏度及抗疲劳性能,最佳掺量为4%;4%剂量纳米氧化锌改性沥青混合料的高温稳定性、水稳定性和低温抗裂性能最佳;采用高速剪切法制备纳米氧化锌改性沥青能够充分发挥纳米粒子的特性,能够与基质沥青发生物理化学反应,形成稳定的改性沥青体系,提高基质沥青的软化点和稠度;在高速剪切作用下,熔融的基质沥青化学键断裂并与纳米粒子表面的羟基发生化学反应,形成纳米粒子基质沥青共熔体系。
[Abstract]:In order to investigate the road performance of nano-zinc oxide modified asphalt mixture, firstly, the preparation of nano-zinc oxide modified asphalt mixture with high speed shear method was carried out. The basic properties of seven kinds of nano-zinc oxide modified asphalt were compared with 7 kinds of nano-zinc oxide modified asphalt by comparing the basic properties of matrix asphalt and seven kinds of modified asphalt. Three different doses of nano-zinc oxide modified asphalt were selected to carry out DSR test and Brookfield viscometer test to analyze the road performance of nano-zinc oxide modified asphalt. Secondly, the pavement performance of asphalt mixture was analyzed by rutting test, immersion Marshall test, freeze-thaw splitting test and low temperature bending test system. The results show that the high temperature, low temperature, viscosity and fatigue resistance of the asphalt can be improved effectively by three kinds of nanometer zinc oxide modified asphalt of 7%, and the best dosage is 4% dosage, and the high temperature stability of the asphalt mixture is improved. The properties of water stability and low temperature crack resistance are the best, and the preparation of nano-ZnO modified asphalt by high-speed shear method can give full play to the properties of nano-particles, and can react with the matrix asphalt to form a stable modified asphalt system. The softening point and consistency of the matrix asphalt were improved, and the chemical bond of the molten matrix asphalt was broken and reacted with the hydroxyl group on the surface of nano-particles under the high speed shear to form the nano-particle matrix asphalt eutectic system.
【作者单位】：华北水利水电大学土木与交通学院;
【基金】：河南省重点科技攻关项目(152102210113) 河南省高等学校青年骨干教师资助计划项目(2014GGJS-064) 河南省高校科技创新团队支持计划项目(15IRTSTHN028) 河南省教育厅科学技术研究重点项目(13A580707,14A580002)
【分类号】：U414

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