长沙理工大学学报（自然科学版）2023，Vol.20Issue(6)：58-68,11.DOI:10.19951/j.cnki.1672-9331.20230726003
沥青中蜡含量预测理论模型初步研究
Preliminary study on theoretical model for prediction of wax content in asphalt
摘要
Abstract
[Purposes]The wax content has a great influence on the pavement performance of asphalt,and it is very important to accurately measure and limit the wax content.Commonly used test methods for wax content have problems such as large errors and complex procedures,and it is difficult to reveal the essence of wax crystallization.To solve issue,this paper constructed a prediction model of wax crystallization in asphalt from a theoretical point of view.[Methods]Taking two kinds of asphalts from SHRP(strategic highway research program)as the research objects,the asphalt was regarded as a solid-liquid two-phase system,and a wax precipitation model was constructed based on the phase equilibrium theory and the normal solution model.[Findings]A parameter of awas used to consider the branching effect of the melting heat for n-alkanes,and a parameter of cwas used to consider the influence of aromatic content.When the parameter awas 0.3 and cwas 0.6,the wax precipitation temperature(wax precipitation temperature,WPT)and wax precipitation curve predicted by the model(wax precipitation curve,WPC)was generally consistent with the test results.A higher carbon number and content of n-alkanes resulted in,more obvious wax precipitation.The increase in aromatic content can lead to an increase in wax precipitation temperature.[Conclusions]By categorizing asphalt components into P(normal alkanes),N(isoalkanes),and A(aromatics),it is feasible to construct a wax content prediction model based on thermodynamics and regular solution theory.Calculations of thermodynamic parameters such as melting point,enthalpy of fusion,and solubility have a substantial influence on the predictive results.The compatibility between normal alkanes and aromatics affects asphalt component interaction,thus exerting an impact on wax precipitation.关键词
沥青/蜡结晶/相平衡/沥青四组分/变温傅里叶变换红外光谱Key words
asphalt/wax crystallization/phase equilibrium/four components of asphalt/variable temperature Fourier transform infrared spectroscopy分类
交通工程引用本文复制引用
牛建发,谢清山,丁海波..沥青中蜡含量预测理论模型初步研究[J].长沙理工大学学报（自然科学版）,2023,20(6):58-68,11.基金项目
中铁三局集团第三工程有限公司工程服务项目"既有公路升级改造低环境影响综合施工技术研究" （）
交通土建工程材料国家地方联合工程研究中心开放基金项目(TCEM-2023-03) Engineering service project of the Third Engineering Co.,Ltd.,China Railway Third Bureau Group"Research on Comprehensive Construction Technology of Low Environmental Impact Upgrading of Existing Highways" （TCEM-2023-03）
Open Fund project of National and Local Joint Engineering Research Center for Transportation and Civil Engineering Materials(TCEM-2023-03) （TCEM-2023-03）
