纳米氧化锌改性沥青混合料性能分析  

Analysis of Performance for Nano-ZnO Modified Asphalt Mixture

作　　者：陈渊召[1] 陈爱玖[1] 李超杰[1] 李振霞[1] CHEN Yuan-zhao CHEN Ai-jiu LI Chao-jie LI Zhen-xia(School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, Henan, Chin)

机构地区：[1]华北水利水电大学土木与交通学院,河南郑州450045

出　　处：《中国公路学报》2017年第7期25-32,共8页China Journal of Highway and Transport

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)

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。In order to investigate pavement performance of nano-ZnO modified asphalt mixture,firstly,nano-ZnO modified asphalt by the proportion of 1%,2%,3%,4%,5%,6% and 7%was prepared in the light of high-speed shearing method and the contrastive analysis of basic properties were carried out between base asphalt and nano-ZnO modified asphalt.The DSR test,BBR test and Brookfield＇s viscosimeter test were carried out by selecting three doses of nano-ZnO modified asphalt at 1%,4% and 7%respectively,to analyze pavement performance of nano-Zno modified asphalt.Secondly,the rutting test,immersion Marshall test,freeze-thaw split test and bending test at low temperature were carried out to analyze pavement performance of asphalt mixture systematically and modification mechanism was analyzed by infrared spectroscopy from micro perspective.The results show that three doses of nano-ZnO modified asphalt by the proportion of 1%,4% and 7% can effectively improve high temperature properties,low temperature properties,viscosity and anti-fatigue properties of the asphalt.and optimal content is4%.High temperature stability,water stability and low temperature crack resistance of nano-ZnO modified asphalt mixture by the dose of 4% reach the optimal state.The strength of nano particles can be fully utilized during the process of the preparation of Nano-ZnO modified asphalt based on high-speed shearing method.There may exist a physical-chemical reaction between Nano-ZnO modified asphalt and base asphalt,with the result of forming a stability of modified asphalt system.Meanwhile,softening point and consistency of the base asphalt can be improved.Under high-speed shearing action,chemical bonds of the melting base asphalt break and react chemically with the hydroxy groups on the surface of the nano-particles,with the result of forming a co-melting system of nano-particles and base asphalt.

关 键 词：道路工程 纳米氧化锌改性沥青 试验研究 机理分析 

分 类 号：U414.1[交通运输工程—道路与铁道工程]