Long-chain alkyl emulsifiers induced asphalt particle dispersion: Lipophilicity-enhancement effect

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-09-13 DOI:10.1016/j.conbuildmat.2024.138275

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引用次数: 0

Abstract

The structure of the lipophilic groups within the emulsifiers plays a pivotal role in uniformly dispersing the asphalt particles in the water regarding the storage and thermal stability of emulsified asphalt. This study combines laboratory experiments with molecular dynamics simulations, investigating the influence of alkyl chain length on emulsified asphalt dispersion and behavior at the oil/water interface. The results reveal that long-chain alkyl emulsifiers (C₁₆TAC and C₁₈TAC) present a lipophilicity-enhancement effect. This phenomenon increases the free volume fraction of emulsified asphalt, reducing viscosity and improving the compatibility of emulsion. This results in smaller asphalt particle sizes (D50 = 1.982μm) and more uniform dispersion. Vigorously lipophilic long-chain alkyl promotes emulsifier molecular migration towards the asphalt phase, thickening the oil/water interfacial layer and reducing interfacial tension and energy by more than 90 %. Notely, long-chain alkyl emulsifiers establish strong hydrogen bonds with water molecules, leading to water molecule aggregation into a hydration layer. Laboratory experimental results demonstrate that this lipophilicity-enhancement effect significantly improves the storage and thermal stability of emulsified asphalt. This research recommends long-chain alkyl emulsifiers in developing and designing energy-efficient pavement engineering regarding high-performance emulsified asphalt.

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长链烷基乳化剂诱导沥青颗粒分散：亲油性增强效应

就乳化沥青的储存和热稳定性而言，乳化剂中亲油基团的结构对沥青颗粒在水中的均匀分散起着关键作用。本研究将实验室实验与分子动力学模拟相结合，研究了烷基链长度对乳化沥青分散性和油/水界面行为的影响。结果表明，长链烷基乳化剂（C16TAC 和 C18TAC）具有亲油性增强效应。这种现象增加了乳化沥青的自由体积分数，降低了粘度，改善了乳液的相容性。这使得沥青粒径更小（D50 = 1.982μm），分散更均匀。亲油性强的长链烷基可促进乳化剂分子向沥青相迁移，从而增厚油/水界面层，使界面张力和能量降低 90% 以上。值得注意的是，长链烷基乳化剂会与水分子建立牢固的氢键，导致水分子聚集成水合层。实验室实验结果表明，这种亲油性增强效果可显著提高乳化沥青的储存稳定性和热稳定性。这项研究建议在开发和设计有关高性能乳化沥青的节能路面工程时使用长链烷基乳化剂。

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

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.