CAJ | 학술논문

制备了不同微波时间处理的胶粉改性沥青，用凝胶渗透色谱测定了微波处理胶粉的甲苯抽出物的相对分子质量分布，采用溶剂抽提法将胶粉改性沥青的胶粉相与沥青相分离，用热重分析考察胶粉的交联度和橡胶烃含量的变化。结果表明，胶粉改性沥青的性质与其在甲苯中的溶解度有明显的联系；经过5 min微波处理的胶粉，在沥青中的降解程度最高，胶粉在沥青中破碎形成带状结构，其制备的改性沥青的延度和针入度最高，软化点稍低；微波处理时间为5 min时胶粉中的部分大分子发生解交联，产生中等大小的分子，而继续延长微波处理时间到6 min，使5 min时形成的中等分子又重新与大分子反应连接。沥青中胶粉的交联度随微波时间延长先减小后增加，4 min时达到最小，而橡胶烃含量随微波时间延长先减小后增加，5 min 时达到最小。胶粉交联度的减小有利于沥青中轻组分溶胀进入胶粉内部，使沥青中重组分相对含量提高，沥青变硬。而胶粉中降解产生的小分子，进入沥青后，使沥青变软，并且在胶粉和沥青之间形成界面层增强了二者的作用力。
제비료불동미파시간처리적효분개성력청，용응효삼투색보측정료미파처리효분적갑분추출물적상대분자질량분포，채용용제추제법장효분개성력청적효분상여력청상분리，용열중분석고찰효분적교련도화상효경함량적변화。결과표명，효분개성력청적성질여기재갑분중적용해도유명현적련계；경과5 min미파처리적효분，재력청중적강해정도최고，효분재력청중파쇄형성대상결구，기제비적개성력청적연도화침입도최고，연화점초저；미파처리시간위5 min시효분중적부분대분자발생해교련，산생중등대소적분자，이계속연장미파처리시간도6 min，사5 min시형성적중등분자우중신여대분자반응련접。력청중효분적교련도수미파시간연장선감소후증가，4 min시체도최소，이상효경함량수미파시간연장선감소후증가，5 min 시체도최소。효분교련도적감소유리우력청중경조분용창진입효분내부，사력청중중조분상대함량제고，력청변경。이효분중강해산생적소분자，진입력청후，사력청변연，병차재효분화력청지간형성계면층증강료이자적작용력。
Modified asphalts by crumb rubber powder with different microwave treating time were prepared. The molecular weight distribution of toluene extract of the crumb rubber microwave treated was determined by gel permeation chromatography. The crumb rubber and asphalt in modified asphalt were separated by solvent extraction to further investigate the crosslinking degree of the crumb powder and rubber hydrocarbon content changes using TG﹣DTA. Results show that the property of the modified asphalt has significant relations with its solubility in toluene. The crumb powder treated with microwave 5 min has the highest degree of degradation in asphalt,and forms banded structures. The crosslinking of part of the macromolecular are decomposed,producing medium﹣sized molecules. The modified asphalt by crumb powder treated 5 min has the highest ductility and penetration but slightly lower in softening point. However,if the microwave treatment time prolongs to 6 min,the crosslinking of the medium﹣sized molecules formed at 5 min treatment occurs again. It is discovered that the extent of crossliking of powder in modified asphalt first decreases and then increases as the microwave treating time prolongs, the lowest crosslinking appears at 4 min treatment. While the rubber hydrocarbon content presents a trend of first decrease and then increase,with 5 min treatment,the content is down to the lowest. De﹣creasing the crosslinking is advantageous for the light components in asphalt swelling into the powder inside,raising the heavier components content,and thus helpful to harden the modified asphalt. The small molecules produced by degradation can enter into and soften the asphalt and form an interface layer between powder and asphalt that enhances the interaction of them.