基于凝胶渗透色谱分析的天然沥青高温性能机理

发布时间：2018-03-01 15:33

本文关键词： 道路工程天然岩沥青凝胶渗透色谱分析高温性能　出处：《功能材料》2014年23期 　论文类型：期刊论文

【摘要】：为明确理解天然沥青改性沥青分子量分布特征与沥青宏观技术性能之间的联系,采用凝胶色谱方法分析不同掺量天然沥青改性沥青的重均分子量、数均分子量、峰值分子量和分散系数等分子量分布特征。开展室内针入度、软化点,粘度和旋转薄膜烘箱老化等实验评价天然沥青改性沥青的路用性能特性。实验结果表明,天然沥青的掺入使改性沥青的分子量在较小分子量M1 000范围内减小;在中等分子量范围内(1 000~6 000)增加明显。重均分子量与M4 000的小分子量组分含量与针入度、软化点和粘度具有良好的线性关系。随着天然沥青掺量的增加,改性沥青的重均分子量和数均分子量逐渐增大,宏观上体现为沥青的高温稳定性得到改善。
[Abstract]:In order to clearly understand the relationship between the molecular weight distribution characteristics of natural asphalt modified asphalt and the macroscopic technical properties of asphalt, the weight average molecular weight and number average molecular weight of natural asphalt modified asphalt with different contents were analyzed by gel chromatography. The characteristics of molecular weight distribution such as peak molecular weight and dispersion coefficient. The indoor penetration, softening point, viscosity and rotative film oven aging were carried out to evaluate the pavement performance of natural asphalt modified asphalt. The addition of natural asphalt reduced the molecular weight of modified asphalt in the range of M1000 and increased significantly in the range of moderate molecular weight. The weight average molecular weight and the content and penetration of the small molecular weight of M4 000 were increased obviously. The softening point and viscosity have a good linear relationship. With the increase of the content of natural asphalt, the weight average molecular weight and the number average molecular weight of modified asphalt increase gradually, and macroscopically, the high temperature stability of modified asphalt is improved.
【作者单位】：长安大学公路学院;长安大学材料学院;
【基金】：国家自然科学基金资助项目(51108038,51108039) 陕西省科技资助项目(2013KW24,2013KJXX-94)
【分类号】：U414

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