Study on viscosity reduction mechanism of warm-mixed rubber modified asphalt: A green sustainable perspective

IF 6.5 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials Pub Date : 2024-07-04 DOI:10.1016/j.cscm.2024.e03494

Jiawei Zhu , Longhao Li , Chaoen Yin , Xiaorui Zhang , Xinxing Zhou , Haopeng Wang

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引用次数: 0

Abstract

Owing to the large viscosity and mixing temperature of crumb rubber modified asphalt (CRMA), possesses high construction costs, the addition of warm-mix agent can reduce the viscosity and mixing temperature of CRMA. In this study, the Sasobit or DWMA-1 warm-mix agent was added into CRMA to prepare the warm-mix crumb rubber modified asphalt (WRMA). Rotational viscosity (RV) measurement revealed that viscosity of WRMA reduced significantly with the increasing temperature. Dynamic shear rheometer (DSR) showed that Sasobit and DWMA-1 have similar effects on the viscoelasticity of WRMA at the actual pavement temperature (64 °C). Phase separation test showed that the addition of warm-mix agent enlarged the softening point difference, and DWMA-1 had better anti-segregation effect than Sasobit. Fourier transform infrared spectroscopy (FTIR) analyses revealed that there was a chemical reaction after mixing the warm-mix agent and produced new functional groups at 1368 cm⁻¹∼735 cm⁻¹. Fluorescence microscope (FM) and polarizing microscope (PM) analyses indicated that warm-mix agents could improve the solubility between rubber and asphalt. DWMA-1 had a lesser impact on the surface roughness of WRMA compared to another warm-mix agent or composite agent. In addition, preparation method and viscosity reduction mechanism of WRMA was elaborated. This study could be of potential interest for engineering applications of WRMA.

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温拌橡胶改性沥青的降粘机理研究：绿色可持续发展视角

由于橡胶屑改性沥青（CRMA）的粘度大、拌和温度高、施工成本高，添加温拌剂可以降低橡胶屑改性沥青的粘度和拌和温度。本研究将 Sasobit 或 DWMA-1 温拌剂添加到 CRMA 中，制备温拌橡胶屑改性沥青（WRMA）。旋转粘度（RV）测量结果表明，随着温度的升高，WRMA 的粘度明显降低。动态剪切流变仪（DSR）显示，在实际路面温度（64 °C）下，Sasobit 和 DWMA-1 对 WRMA 粘弹性的影响相似。相分离试验表明，温拌剂的加入扩大了软化点差异，DWMA-1 的抗离析效果优于 Sasobit。傅立叶变换红外光谱（FTIR）分析表明，混入温拌剂后发生了化学反应，在 1368 cm-1∼735 cm-1 处产生了新的官能团。荧光显微镜（FM）和偏光显微镜（PM）分析表明，温拌剂可以提高橡胶和沥青之间的溶解度。与其他温拌剂或复合剂相比，DWMA-1 对 WRMA 表面粗糙度的影响较小。此外，还阐述了 WRMA 的制备方法和降粘机制。这项研究对 WRMA 的工程应用具有潜在的意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Construction Materials Multiple-

CiteScore

7.60

自引率

19.40%

发文量

842

审稿时长

63 days

期刊介绍： Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.