Development and performance evaluation of composite flame retardant based on the thermodynamic properties of asphalt components

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

Construction and Building Materials Pub Date : 2024-11-16 DOI:10.1016/j.conbuildmat.2024.139152

Wenbo Li , Mulian Zheng , Liwei Zhang , Ping Peng , Jinping Yang

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Abstract

The demand for enhanced flame retardancy in asphalt pavement has increased due to its extensive use in enclosed spaces like tunnels. Based on four components of asphalt, the thermodynamic tests, basic performance tests, limit oxygen index tests, storage stability tests, and microscopic experiments were used to prepare and evaluate a new type of composite flame retardant asphalt. The results indicated that the thermal stability of the saturate and aromatic fractions was poor, while the resin and asphaltene components exhibited better thermal stability during combustion. The thermodynamic properties of the selected flame retardant materials were matched with different asphalt components. Three flame retardant systems were designed, and the final composition ratio was determined using orthogonal experiments and the entropy method. Compared to single and binary flame retardant systems, the asphalt with the three-component flame retardant system showed significantly better flame retardant performance. The softening point difference of asphalt increased continuously with higher flame retardant dosages. To maintain storage stability, the flame retardant content should be controlled below 12 %. Despite some agglomeration, most flame retardants were present as individual particles, indicating good dispersion in the asphalt. This study delves into the multi-stage combustion dynamics of asphalt from the perspective of its components and proposes a composite flame retardant formulation scheme. The findings are significant for the development of tunnel asphalt pavement and environmental protection.

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基于沥青成分热力学特性的复合阻燃剂的开发和性能评估

由于沥青路面在隧道等封闭空间中的广泛应用，对其阻燃性能的要求越来越高。以沥青的四种组分为基础，通过热力学试验、基本性能试验、极限氧指数试验、储存稳定性试验和微观实验，制备并评价了一种新型复合阻燃沥青。结果表明，饱和组分和芳香组分的热稳定性较差，而树脂组分和沥青烯组分在燃烧过程中表现出较好的热稳定性。将所选阻燃材料的热力学性质与不同的沥青成分进行了匹配。设计了三种阻燃剂体系，并利用正交实验和熵法确定了最终的组成比例。与单组分和二元阻燃体系相比，三组分阻燃体系的沥青阻燃性能明显更好。随着阻燃剂用量的增加，沥青的软化点差异不断增大。为保持储存稳定性，阻燃剂含量应控制在 12% 以下。尽管存在一些团聚现象，但大多数阻燃剂都以单个颗粒的形式存在，这表明阻燃剂在沥青中的分散性良好。本研究从沥青成分的角度深入研究了沥青的多级燃烧动力学，并提出了一种复合阻燃剂配方方案。研究结果对隧道沥青路面的发展和环境保护具有重要意义。

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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.