橡胶粉改性沥青中挥发性有机化合物的排放及其用蒙脱石纳米粘土的抑制作用

Emission of Volatile Organic Compounds in Crumb Rubber Modified Bitumen and Its Inhibition by Using Montmorillonite Nanoclay.

作者信息

Liu Gang, Fang Shuaiyin, Wang Yong, Liu Jinjun, Liang Yangshi, Cao Tingwei, Liu Quantao

机构信息

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.

College of Water and Architectural Engineering, Shihezi University, Shihezi 832003, China.

出版信息

Polymers (Basel). 2023 Mar 18;15(6):1513. doi: 10.3390/polym15061513.

DOI:10.3390/polym15061513

PMID:36987293

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10053872/

Abstract

Bitumen emits a large amount of volatile organic compounds (VOCs) during the production and construction of asphalt mixture, which can cause both environmental hazards and health risks. In this study, a setup was designed to collect the VOCs released by base and crumb rubber-modified bitumen (CRMB) binders and their composition was characterized by thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS). Next, organic montmorillonite (Mt) nanoclay was added into CRMB binder and its inhibiting effect on the VOCs emission of the binder was investigated. Finally, the VOCs emission models for the CRMB and Mt-modified CRMB (Mt-CRMB) binders were established according to reasonable assumptions. The results indicated that the VOCs emission of CRMB binder was 3.2 times larger than that of the base binder. Due to its intercalated structure, the nanoclay can reduce the VOCs emission of CRMB binder by 30.6%. Especially, its inhibition effects on alkanes, olefins, and aromatic hydrocarbons were more significant. After finite element verification, the established model based on the Fick's second law can describe the emission behavior of CRMB and Mt-CRMB binders well. Overall, the Mt nanoclay can be used as an effective modifier to inhibit the VOCs emission of CRMB binder.

摘要

在沥青混合料的生产和施工过程中，沥青会释放大量挥发性有机化合物（VOCs），这会造成环境危害和健康风险。在本研究中，设计了一套装置来收集基质沥青和橡胶粉改性沥青（CRMB）粘结剂释放的VOCs，并通过热脱附-气相色谱-质谱联用仪（TD-GC-MS）对其成分进行表征。接下来，将有机蒙脱土（Mt）纳米粘土添加到CRMB粘结剂中，研究其对粘结剂VOCs排放的抑制作用。最后，根据合理假设建立了CRMB和Mt改性CRMB（Mt-CRMB）粘结剂的VOCs排放模型。结果表明，CRMB粘结剂的VOCs排放量是基质粘结剂的3.2倍。由于其插层结构，纳米粘土可使CRMB粘结剂的VOCs排放量降低30.6%。特别是，其对烷烃、烯烃和芳烃的抑制作用更为显著。经过有限元验证，基于菲克第二定律建立的模型能够很好地描述CRMB和Mt-CRMB粘结剂的排放行为。总体而言，Mt纳米粘土可作为一种有效的改性剂来抑制CRMB粘结剂的VOCs排放。