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高比例DCLR改性沥青的制备、性能及作用机理

Preparation, Properties, and Interaction Mechanism of High-Ratio DCLR-Modified Asphalt.

作者信息

Xia Lei, Su Qidong, Liu Jian, Wang Qi, Cao Dongwei, Zhang Gaoqiang, Shan Lingyan

机构信息

School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China.

Research Institute of Highway Ministry of Transport, Beijing 100088, China.

出版信息

Materials (Basel). 2025 Apr 15;18(8):1798. doi: 10.3390/ma18081798.

DOI:10.3390/ma18081798
PMID:40333459
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12028432/
Abstract

In response to the complex pretreatment processes (e.g., solvent dissolution and high-temperature melting) of direct coal liquefaction residue (DCLR) in asphalt, its low-dosage limitation for high-value utilization in asphalt pavement, and the unclear interaction mechanisms between high-proportion DCLR and asphalt, this study comprehensively analyzed the molecular composition and structural characteristics of DCLR at multiple scales using FTIR, GPC, SEM, BET, Tg-FTIR, and XRD. DCLR was crushed to a particle size of 0.15 mm and mixed with 70# base asphalt at mass ratios of 10:100, 15:100, 20:100, 25:100, 30:100, 40:100, and 45:100 at 185 °C to prepare high-proportion DCLR-modified asphalt. The conventional and rheological properties of DCLR-modified asphalt at various dosages were evaluated and compared with those of Buton rock asphalt (BRA)-modified asphalt at equivalent dosages. The results indicated that DCLR and BRA significantly improved the high-temperature performance and PG grade of the base asphalt but reduced its low-temperature performance and grade. At equivalent dosages, DCLR exhibited a more pronounced enhancement in high-temperature performance and a greater reduction in low-temperature performance compared to BRA. High-proportion DCLR-modified asphalt meets the technical requirements for high-modulus asphalt. Using FTIR, GPC, four-component analysis, and elemental analysis, the chemical composition and performance variation trends of high-proportion DCLR-modified asphalt were investigated at multiple scales. The interfacial physical, chemical, and mechanical behaviors between DCLR and base asphalt were characterized. The interaction mechanisms between high-proportion DCLR and asphalt were elucidated, and a novel application strategy for DCLR in asphalt was proposed, significantly enhancing its resource utilization rate in road engineering.

摘要

针对直接煤液化残渣（DCLR）在沥青中复杂的预处理过程（如溶剂溶解和高温熔融）、其在沥青路面高值利用中的低剂量限制以及高比例DCLR与沥青之间不明确的相互作用机制，本研究利用傅里叶变换红外光谱（FTIR）、凝胶渗透色谱（GPC）、扫描电子显微镜（SEM）、比表面积分析仪（BET）、热重-傅里叶变换红外光谱（Tg-FTIR）和X射线衍射仪（XRD）在多个尺度上全面分析了DCLR的分子组成和结构特征。将DCLR粉碎至粒径为0.15 mm，并在185℃下以质量比10:100、15:100、20:100、25:100、30:100、40:100和45:100与70#基质沥青混合，制备高比例DCLR改性沥青。评估了不同剂量下DCLR改性沥青的常规性能和流变性能，并与等量的布敦岩沥青（BRA）改性沥青进行了比较。结果表明，DCLR和BRA显著改善了基质沥青的高温性能和PG等级，但降低了其低温性能和等级。在等量剂量下，与BRA相比，DCLR在高温性能方面表现出更显著的增强，在低温性能方面表现出更大的降低。高比例DCLR改性沥青满足高模量沥青的技术要求。利用FTIR、GPC、四组分分析和元素分析，在多个尺度上研究了高比例DCLR改性沥青的化学组成和性能变化趋势。表征了DCLR与基质沥青之间的界面物理、化学和力学行为。阐明了高比例DCLR与沥青之间的相互作用机制，提出了DCLR在沥青中的新型应用策略，显著提高了其在道路工程中的资源利用率。

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