摘要
高温法Terminal Blend(TB)胶粉改性沥青技术同时解决了传统橡胶沥青黏度大、存储稳定性差、恶臭排放的问题,但260℃高温工艺可能会引起安全问题,且生产难度较高。采用红外光谱分析(FTIR)、溶解度试验、凝胶渗透色谱分析(GPC)、流变学试验、存储稳定性试验,综合对比了高温法(260℃)、化学活化法(200℃)、高速剪切法(200℃)制备胶粉改性沥青的分子结构、溶解度、分子量分布、流变性质、离析等指标。结果表明:3种方法制备的胶粉改性沥青,均发生了脱硫反应(红外光谱966 cm^(-1)峰活性聚合物基团增强)与降解反应(部分胶粉大分子链段降解,产生与沥青质尺寸相当的分子链),高温法和化学活化法的脱硫降解程度比剪切法剧烈;高温法和化学活化法制备TB胶粉改性沥青的溶解度不低于96%,较剪切法提高4%~7%,135℃黏度约为1.2~1.3 Pa·s,约为剪切法的1/3;20%胶粉含量下,200℃高速剪切法及48 h发育难以制备出低黏度TB胶粉改性沥青;降低胶粉含量可在发育过程中加快胶粉的降解,高速剪切法具有制备低含量TB胶粉改性沥青的潜力。
The high-temperature terminal blend(TB)rubber powder modified asphalt technology can simultaneously solve the high viscosity,poor storage stability and odor emission issues caused by traditional asphalt rubber(AR).However,the 260℃high-temperature process may cause safety issues and production difficulty is relatively high.The molecular structure,solubility,molecular weight distribution,rheological properties,segregation and other indicators of rubber powder modified asphalt prepared by high-temperature method(260℃),chemical activation method(200℃)and high-speed shear method(200℃)were comprehensively compared by means of FTIR,solubility test,gel permeation chromatography(GPC),rheological test and storage stability test.The results indicate that the rubber powder modified asphalt prepared by three kinds of methods all undergo desulfurization reaction(enhanced active polymer groups at 966 cm^(-1) peak in infrared spectrum)and degradation reaction(degradation of large molecular chain segments of partial rubber powder,which produces molecular chains equivalent in size to asphaltene).The degree of desulfurization degradation by high-temperature method and chemical activation method is more severe than that by shear method.The solubility of TB rubber powder modified asphalt prepared by high-temperature method and chemical activation method is greater than 96%and is about 4%~7%higher than that of shear method.The viscosity at 135℃is about 1.2~1.3 Pa·s,which is about one-third of that of shear method.Under 20%rubber powder content,it is difficult to prepare low viscosity TB rubber powder modified asphalt by high-speed shear method at 200℃and 48 hours of development.Reducing the content of rubber powder can accelerate the degradation of rubber powder during the development process.The high-speed shear method has the potential to prepare low content TB rubber powder modified asphalt.
作者
路本升
杨帆
张国扬
周晓静
唐乃膨
LU Bensheng;YANG Fan;ZHANG Guoyang;ZHOU Xiaojing;TANG Naipeng(Shandong Hi-speed Construction Management Co.,Ltd.,Ji nan 250014,Shandong,China;Shandong Hi-speed Western Route Beltway Co.,Ltd.,Ji nan 250399,Shandong,China;Shandong Expressway New Material Technology Co.,Ltd.,Ji nan 250013,Shandong,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第6期25-31,共7页
Journal of Chongqing Jiaotong University(Natural Science)
基金
山东省交通运输厅科技计划项目(2020B59)
国家自然科学基金项目(51808073)
重庆市自然科学基金项目(cstc2021jcyj-msxmX0637)。
关键词
道路工程
TB胶粉改性沥青
脱硫降解
反应机理
流变性质
highway engineering
terminal blend rubber powder modified asphalt
devulcanization and depolymerization
reaction mechanism
rheological property
