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MORPHOLOGY AND PERFORMANCE CHARACTERIZATION OF INTUMESCENT COATINGS FOR FIRE PROTECTION OF STRUCTURAL STEEL

Kang, Jiyuan
http://rave.ohiolink.edu/etdc/view?acc_num=case1544112058459729

Abstract Details

2019, Doctor of Philosophy, Case Western Reserve University, EMC - Mechanical Engineering.
Intumescent coating is becoming popular in building constructions as a passive fire protection product. It expands and forms a porous thermal protective char layer when exposed to a fire and can effectively protect building steel structures from high temperature. A large number of studies about intumescent coatings have been conducted, particularly in the following fields: (1) chemical formulation, which focuses on the choices of ingredients; i.e., a carbon source, an acid source and a blowing agent, to form a proper combination; and (2) numerical models, which aim to simulate the chemical-reaction and heat-transfer processes during the fire protection period. To develop a new formulation and additives or to validate the numerical models, the characterization of the char formation is of essential importance. However, a universal characterization method has not yet been fully developed for diagnosing the internal char-forming processes, the morphological structure of the char formed, and the real-time interior thermal properties during the fire protection period. This deficiency stems mainly from technical difficulties in obtaining structure character from the expanded char without damage and measuring a precise heat transfer history from a high temperature (up to 600 ℃ ) shape changing porous media. In this study, a laboratory-scale mass-loss cone heating device is used to impose three incident radiant heat fluxes (25, 50, and 75 kW/m2) on different types of intumescent coatings (water-based and epoxy-based). The morphological characteristics of the expanded and charred intumescent coatings have been studied using a computer tomography (CT)-based analysis method. Image processing techniques are applied to the CT-scanned data to generate 3D reconstructed images and to measure structure properties using ImageJ software. Thermal insulating performance (apparent thermal conductivity and heat blocking efficiency) of the expanding char layer is determined in situ based on real-time measurements of the temperature distribution in the char layer and the heat flux transmitted through the char layer. The Dynamic Plane Source (DPS) method is also employed to measure the thermal conductivity of the post-exposure char as a verification method of the in-situ measurements. The present structure and thermal characterization method is useful to assist in new formulation developments and to advance numerical modeling.
Fumiaki Takahashi, Professor (Committee Chair)
James Tien, Professor (Committee Co-Chair)
Ya-Ting Liao, Professor (Committee Member)
Gary Wnek, Professor (Committee Member)
122 p.
Engineering; Industrial Engineering; Mechanical Engineering
Passive fire protection, Heat-blocking efficiency, Thermal insulation, Structural steel, Structure analyses, Mass loss cone apparatus, Micro CT scanner, Porosity, Pore size distribution

Recommended Citations

Citations

  • Kang, J. (2019). MORPHOLOGY AND PERFORMANCE CHARACTERIZATION OF INTUMESCENT COATINGS FOR FIRE PROTECTION OF STRUCTURAL STEEL [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1544112058459729

    APA Style (7th edition)

  • Kang, Jiyuan. MORPHOLOGY AND PERFORMANCE CHARACTERIZATION OF INTUMESCENT COATINGS FOR FIRE PROTECTION OF STRUCTURAL STEEL. 2019. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1544112058459729.

    MLA Style (8th edition)

  • Kang, Jiyuan. "MORPHOLOGY AND PERFORMANCE CHARACTERIZATION OF INTUMESCENT COATINGS FOR FIRE PROTECTION OF STRUCTURAL STEEL." Doctoral dissertation, Case Western Reserve University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1544112058459729

    Chicago Manual of Style (17th edition)

case1544112058459729
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© 2018, some rights reserved.Creative Commons License MORPHOLOGY AND PERFORMANCE CHARACTERIZATION OF INTUMESCENT COATINGS FOR FIRE PROTECTION OF STRUCTURAL STEEL by Jiyuan Kang is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.