Quantitative Analysis on Distribution of Modifier in Microstructure of SBS Modifi ed Asphalt

• Published in: 武汉理工大学学报：材料科学英文版 no. 4; pp. 740 - 744
• Main Author: YIN Wei YANG Qun
• Format: Journal Article
• Language: English
• Published: 2014
• Subjects: MATLAB软件; SBS; 定量分析; 微观结构; 改性剂; 改性沥青; 显微图像; 混合物
• ISSN: 1000-2413; 1993-0437

A method was developed to make a quantitative analysis of the microstructure of asphalt modified with styrene-butadiene-styrene block（SBS） copolymer. Moreover, both mixed and branched SBS were employed in the preparation of modified asphalt. By sampling specimens from the top, middle, and bottom, a number of microscope slides were made and 400 times micro images were gained. Binarized with the software of MATLAB, the images then went to the process of distribution test, when four typical distributions were employed to investigate the distribution of modifi er spread in asphalt. The distribution characteristic and its parameter were both found. The results show that asphalt phase clearly obeys Poisson distribution, and its parameter, λ, is bond up with the condition SBS performs in. Based on this parameter, indexes can be set up to evaluate the structure of the mixture and its performance as well. Compared with that modifi ed with mixed SBS, the asphalt modifi ed with branched SBS has better performance but worse stability, for it is easier to segregate.