| 摘要: |
| 利用傅里叶变换红外光谱(FTIR)和原子力显微镜(AFM)，分析了热氧老化前后，添加温拌剂EM、SDYK的胶粉改性沥青化学成分及其变化规律，计算了表征沥青老化程度的各官能团指数，以及老化前后胶粉改性沥青的黏附力、DMT模量和纳米级力学特性的变化规律.结果表明：添加温拌剂EM和SDYK的胶粉改性沥青内部未发生明显的化学变化，只是相似者相容，改变了沥青各组分的含量；热氧老化导致胶粉改性沥青发生了氧化与缩合反应以及分子间的断裂与重组，改变了沥青的化学成分与纳米级力学特性；经过热氧老化后，添加温拌剂SDYK的胶粉改性沥青官能团指数和DMT模量增幅均最小，黏附力降幅最小，说明其抗老化能力优于添加温拌剂EM和未添加温拌剂的胶粉改性沥青. |
| 关键词: 傅里叶变换红外光谱(FTIR) 原子力显微镜(AFM) 热氧老化 温拌胶粉改性沥青 微观特性 |
| DOI：103969/j.issn.1007 9629202006025 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(11762012)；内蒙古交通科技项目(NJ_2015_1)；内蒙古工业大学科学研究项目(ZY201809) |
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| Investigation on Microscale Characteristics of Warm Mix Rubber Modified Asphalt Depending on Thermal Oxidative Aging |
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HUANG Xiaoyan, WANG Lan
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School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
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| Abstract: |
| The chemical composition of warm mix rubber modified asphalt with EM and SDYK were analyzed by Fourier transform infrared spectram(FTIR) and atomic force microscope(AFM), and index of each functional group was calculated. The adhesion, Derjaguin Muller Toropov modulus(DMT modulus) of nano scale mechanical properties of rubber modified asphalt were analyzed by preceding and post thermo oxidative aging. The results showed that after the addition of EM and SDYK, there is no obvious chemical change in asphalt, but the content of asphalt components is changed. Thermal oxidative aging leads to the reaction of oxidation and condensation, fracture and recombination among molecular in rubber modified asphalt, which changes the chemical composition and nano mechanical properties of asphalt. After thermal oxidative aging, rubber modified asphalt with warm mixing agent SDYK has the smallest increase in functional group index and in DMT modulus, and the smallest decrease in adhesion. The results show that its anti aging ability is better than that of asphalt with warm mixing agent EM and without warm mixing agent. |
| Key words: Fourier transform infrared spectrum(FTIR) atomic force microscopy(AFM) thermal oxidative aging warm mix rubber modified asphalt microscale characteristics |
