Combustion Performance of Thermally Aged Asphalt Blended with ATH/ZB Flame Retardant

IF 2.3 3区工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY Fire Technology Pub Date : 2024-09-06 DOI:10.1007/s10694-024-01639-0

Dan Zhao, Kai Zhu, Zhirong Liang, Qiang Wang, Hongda Lin, Xuewei Qin, Haojia Jiang, Dong Ye, Ke Wu

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Abstract

Asphalt blended with flame retardant undergoes thermal aging during utilization, which significantly impacts its physical and chemical characteristics concurrently. This study focuses on analyzing the effectiveness of aluminum hydroxide/zinc borate (ATH/ZB) flame retardant on varying the combustion performance of asphalt, particularly after undergoing thermal aging (85 min and 270 min aging simulations were performed, corresponding to short-term and long-term thermal aging, respectively). The results showed that ATH/ZB flame-retardant can increase the softening point of asphalt before and after aging. ATH/ZB flame-retardant asphalt (FRA) after aging had fewer carbonyl and sulfoxide groups than base asphalt (BA), demonstrating the superior anti-oxidation capability of FRA. ATH/ZB delays the peak heat release rate (PHRR) commencement by over 200 s, decreases the PHRR intensity by more than 170 kW/m², and decreases the asphalt’s combustion activation energy, which was owing to the fact that the sacrifice of the thermolabile flame retardant protects the asphalt from being aggressively combusted. Whereas, thermal aging enhances the PHRR intensity of FRA by 83 kW/m², which is owing to the reduction of ATH/ZB content in FRA after aging. Aging deteriorates the flame retardant’s capability on anti-combustion.

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掺有 ATH/ZB 阻燃剂的热陈化沥青的燃烧性能

掺有阻燃剂的沥青在使用过程中会经历热老化，这同时会对其物理和化学特性产生重大影响。本研究重点分析了氢氧化铝/硼酸锌（ATH/ZB）阻燃剂对改变沥青燃烧性能的效果，尤其是在经过热老化后（分别进行了 85 分钟和 270 分钟的老化模拟，分别对应短期和长期热老化）。结果表明，ATH/ZB 阻燃剂可以提高沥青在老化前后的软化点。与基质沥青（BA）相比，老化后的 ATH/ZB 阻燃沥青（FRA）具有更少的羰基和亚砜基团，这表明 FRA 具有更强的抗氧化能力。ATH/ZB 可将峰值热释放率（PHRR）的开始时间延迟 200 秒以上，将峰值热释放率强度降低 170 kW/m2 以上，并降低沥青的燃烧活化能，这是因为牺牲了易燃阻燃剂可保护沥青不被剧烈燃烧。而热老化会使 FRA 的 PHRR 强度提高 83 kW/m2，这是由于老化后 FRA 中的 ATH/ZB 含量减少。老化会降低阻燃剂的抗燃烧能力。

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来源期刊

Fire Technology 工程技术-材料科学：综合

CiteScore

6.60

自引率

14.70%

发文量

137

审稿时长

7.5 months

期刊介绍： Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis. The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large. It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.