钾基地聚物防火涂料性能与陶瓷化研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1805-1812.

钾基地聚物防火涂料性能与陶瓷化研究

李秋¹, 姜雨杭², 耿海宁³, 陈伟¹

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.武汉理工大学材料科学与工程学院,武汉 430070;
3.湖北城市建设职业技术学院建筑工程学院,武汉 430205

收稿日期:2021-12-29 修回日期:2022-01-26 出版日期:2022-05-15 发布日期:2022-06-01
通讯作者: 陈伟,博士,教授。E-mail:Chen.Wei@whut.edu.cn
作者简介:李秋(1975—),男,博士,研究员。主要从事先进无机胶凝材料的研究。E-mail:Qiu-Li@whut.edu.cn
基金资助:
国家自然科学基金面上项目(52072279);硅酸盐建筑材料国家重点实验室开放基金(SYSJJ2021-12);深圳市科技计划项目协同创新专项(CJGJZD20200617102601003)

Properties and Ceramization of Potassium-Based Geopolymer Fire Resistance Coating

LI Qiu¹, JIANG Yuhang², GENG Haining³, CHEN Wei¹

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
3. Architectural Engineering Institute, Hubei Urban Construction Vocational and Technological College, Wuhan 430205, China

Received:2021-12-29 Revised:2022-01-26 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

摘要： 钢结构因具有多种优点而被广泛应用于工程建筑领域,但其在火灾高温环境下会丧失力学性能,造成结构失效,因此对钢结构进行防火保护成为关键。以偏高岭土、矿粉和憎水处理后的膨胀珍珠岩为主要原材料,模数为1.5的钾水玻璃为激发剂,制备非膨胀型钾基地聚物基防火涂料,并采用大板燃烧法研究该涂料在1 200 ℃下的防火性能;同时,对其在室温、1 000 ℃以及1 100 ℃热处理前后的力学性能、表观形貌、物相组成、微观结构演变进行了表征分析,探究地聚物在高温过程中的陶瓷化过程。结果表明:该防火涂料具有优异的防火能力,在1 200 ℃下进行2 h耐火极限试验后,钢板背面温度低于160 ℃;防火涂料在1 100 ℃高温热处理2 h后,抗压强度大幅增加至室温强度的5.8倍,达30.80 MPa;防火涂料基体的无定型地聚物相在800 ℃开始发生陶瓷化转变,1 100 ℃时生成的陶瓷相主要为钙长石、莫来石以及白榴石。

关键词: 钢结构, 防火涂料, 地聚物, 钾基地聚物, 陶瓷化, 微观形貌

Abstract: Steel structures are widely used in the field of engineering building because of its high toughness, high strength, easy processing and other advantages. However, steel structures will lose their mechanical properties under high-temperature environments, causing structural failure. Therefore, fire protection becomes crucial to the safety of steel structures. In this study, using metakaolin, slag and hydrophobic-treated expanded perlite as main raw materials, and potassium water glass with modulus of 1.5 as activator, a non-expanded potassium-based a geopolymer fire resistance coating was prepared. The fire resistance performance of coating was characterized by the big panel method under 1 200 ℃.At the same time, the mechanical properties, apparent morphology, phase composition, and microstructure evolution of the geopolymers before and after heat treatment at room temperature, 1 000 ℃ and 1 100 ℃ were characterized and analyzed, and the ceramicization process of geopolymers at high temperature was explored. The results show that the geopolymer coating has great fire resistance properties. The temperature on back of the steel plate is lower than 160 ℃ after exposure to 1 200 ℃ for 2 hours. The compressive strength of coating increases to 30.80 MPa after heat treatment at 1 100 ℃ for 2 h, which is 5.8 times of that under room temperature. The amorphous geopolymer phases of fire retardant coating starts ceramization at 800 ℃ and the main crystalline phases after ceramization at 1 100 ℃ are anorthite, leucite and mullite.

Key words: steel structure, fire resistance coating, geopolymer, potassium-based geopolymer, ceramization, microstructure

中图分类号:

TU545

李秋, 姜雨杭, 耿海宁, 陈伟. 钾基地聚物防火涂料性能与陶瓷化研究[J]. 硅酸盐通报, 2022, 41(5): 1805-1812.

LI Qiu, JIANG Yuhang, GENG Haining, CHEN Wei. Properties and Ceramization of Potassium-Based Geopolymer Fire Resistance Coating[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1805-1812.

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