摘要
为了研究委内瑞拉岩沥青的原材料性质及其改性效果,通过室内委内瑞拉岩沥青及其改性沥青的物化性能试验,分析了其原材料的物理性质、沥青含量(质量比例)、沥青四组分及矿物质成分,评价了不同掺量委内瑞拉岩沥青对其改性沥青性能的影响规律,并揭示了其改性机理。研究结果表明:委内瑞拉岩沥青中沥青的含量高达95%以上,且沥青质和胶质的含量超过了80%,是一种高聚合度的硬质沥青,其中的矿物质主要含有SiO2,CaSO4和CaS及少量CaCO3;委内瑞拉岩沥青用作改性剂时,能显著提高改性沥青的黏度和抗变形能力,改善高温、抗老化、抗水损及感温等路用性能,但对低温性能有不利影响,故宜控制委内瑞拉岩沥青掺量不超过其改性沥青总质量的15%;委内瑞拉岩沥青与基质沥青有相近的官能团,二者不仅能很好地混融,而且未发生化学反应,属于物理改性,较适宜于湿法掺拌改性工艺,可配制较适用于南方湿热地区的低标号硬质沥青。
In order to research the raw material properties and modification effects of Venezuela rock asphalt,the physicochemical properties of Venezuela rock asphalt and its modified asphalt were tested in laboratory.The physical properties,asphalt content(mass proportion),asphalt four-component and mineral composition were analyzed for its raw materials.The influence rules were evaluated for different mixing amounts of Venezuela rock asphalt on the performances of its modified asphalt,and the modification mechanism was revealed.The results show that the asphalt content in Venezuela rock asphalt is at up to more than 95%,and the content of asphaltene and colloid exceeds 80%,which is a kind of hard asphalt with high degree of polymerization.Its minerals mainly contain SiO2,CaSO4,CaS and a small amount of CaCO3.Using for modifier,it can significantly enhance the viscosity and deformation resistance of its modified asphalt,and improve the pavement performances such as high temperature,ageing resistance,moisture damage resistance and temperature sensitivity etc.However,it has an adverse effect on low temperature performance.Then the mixing amount of Venezuela rock asphalt should be controlled within 15%of the total mass of its modified asphalt.Venezuela rock asphalt and the base asphalt have similar functional groups,both of them can not only mix well,but also there is no obvious chemical reaction to belong to a physical modification.Therefore,Venezuela rock asphalt is more suitable for wet mixing modified process to prepare the low-grade hard asphalt which can be more suitable for the southern hot and humid areas.
作者
查旭东
陈海萍
胡恒武
邓杰元
宋小金
王文强
ZHA Xu-dong;CHEN Hai-ping;HU Heng-wu;DENG Jie-yuan;SONG Xiao-jin;WANG Wen-qiang(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Hunan Zhongda Construction Engineering Testing Technology Co.,Ltd.,Changsha 410125,China;Foshan Highway&Bridge Construction Co.,Ltd.,Foshan 528313,China)
出处
《交通科学与工程》
2020年第1期1-6,共6页
Journal of Transport Science and Engineering
基金
国家自然科学基金资助项目(51878077)
安徽省交通运输科技进步计划项目(201720)
佛山市建盈发展有限公司科技项目(FS-XTNH-G-〔2018〕011)。
关键词
委内瑞拉岩沥青
天然沥青
矿物质
材料性质
路用性能
改性机理
Venezuela rock asphalt
natural asphalt
minerals
material properties
pavement performance
modification mechanism
作者简介
查旭东(1970-),男,长沙理工大学教授,博士生导师。
