乳化沥青与基质沥青的感温性能评价

Evaluation on Temperature Susceptibility of Emulsified Asphalt and Base Asphalt

以辽河AH-90沥青为基质沥青,以自制的Gemini季铵盐阳离子表面活性剂为乳化剂,可制备乳化沥青。采用针入度黏度指数(PVN)和针入度指数(PI)考察两种沥青的温度敏感性,采用当量软化点T800和60℃动力黏度考察两种沥青高温稳定性和抗车辙能力,采用当量脆点T1.2考察低温抗裂性。结果显示,通过沥青乳化工艺,可改善沥青的针入度指数、弹性、低温延度和抗变形能力,增强基质沥青的高温稳定性、低温抗开裂性能及抗疲劳性能。与AH-90基质沥青相比,乳化沥青具有较弱的温度敏感性、较强的高温稳定性与抗车辙能力,以及较强的低温抗裂性,说明沥青乳化后感温性能明显增强。

In this paper,emulsified asphalt was prepared using AH-90 asphalt donated by Liaohe oil-field（China） as base asphalt and self made dissymmetric Gemini quaternary ammonium salts cationic surfac-tant as emulsifier.The temperature sensitivity of the two kinds of asphalts was determined by penetration-viscosity index（PVN） and penetration index（PI）.The index of T800 and dynamic viscosity at 60 ℃ were used to appreciate the stability at high temperature.The anti-cracking in low temperature was ex-plored by T1.2.Results show the asphalt emulsion technology can not only improve penetration index,flexibility,low-temperature ductility and deformation resistance,but also enhance high temperature sta-bility,low-temperature anti-cracking performance and anti-fatigue performance.The emulsified asphalt show better temperature stability,better low-temperature cracking resistance and better temperature sus-ceptibility than base asphalt.