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Study on Fire Resistance Characteristics of Fire Protection Materials of High water content

高含水防火材料耐火特性研究

基本信息

批准号：
11650232
负责人：
ASAKO Yutaka
金额：
$ 2.3万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650232/
关键词：
Fire protection material High water content Super absorbent polymer Calcium chloride solution Gel Fire resistance test

项目摘要

It is well known that moist fire protection materials show good fire resistance characteristics. For this reason, these materials are usually made of mixtures of cement mortar and high-water content materials such as silica gels or moist perlites. The latent heat of water plays an important role in the resistance of heat propagation in these materials. Recently, a fire resistance test on a perlite-mortar mixed with the super-absorbent polymer gel which absorbed the calcium chloride solution have been conducted and it was concluded from the temperature response of this fire protection material that the tested material have very good fire resistance characteristics. However, the composition of the tested material was fixed at the mixing ratio of gels and perlite-mortar, V_<gel>/V_<pm>=1, and the mixing ratio of perlite and cement, V_p/V_c=1. These mixing ratios may affect on the fire resistance characteristics and there may exist the optimum mixing ratios. This is the motivation of the p … More resent study.In this study, to find the fire resistance characteristics and parameters dominating the fire resistance characteristics, the thermal conductivity and the water content were measured for materials whose mixing ratios were combination of V_p/V_c=1 and 3 ＆ V_<gel>/V_<pm>=1 and 2. And using the measured thermal properties of the test materials, numerical simulations for the fire resistant test were conducted. The main conclusions obtained are :(1) Both the water content and the effective thermal conductivity are important parameters for the fire resistance material. And the mass fraction of free water in the test material increases with increasing the mixing ratio of the gels and perlite-mortar.(2) In the high temperature range above 373 K, the effective thermal conductivity decreases with increasing the mixing ratio of perlite and cement. And the effective thermal conductivity decreases with increasing the mixing ratio of gel and perlite-mortar.(3) The longest fire resistance time among the test materials is 330 minutes. Less

众所周知，湿性防火材料具有良好的耐火特性。因此，这些材料通常由水泥砂浆和高含水量材料（如硅胶或湿珍珠岩）的混合物制成。水的潜热对这些材料的热传播阻力起着重要的作用。最近，对一种珍珠岩砂浆与吸收氯化钙溶液的高吸水性聚合物凝胶混合进行了耐火试验，从该防火材料的温度响应中得出结论，该防火材料具有很好的耐火特性。而试验材料的组成固定为凝胶与珍珠岩-砂浆的混合比V_<gel>/V_<pm>=1，珍珠岩与水泥的混合比V_p/V_c=1。这些掺合比都会对耐火性能产生影响，并且可能存在最佳掺合比。这就是最近研究的动机。在本研究中，为了找到耐火特性和控制耐火特性的参数，对混合比为V_p/V_c=1和3和V_<gel>/V_<pm>=1和2的组合材料的导热系数和含水量进行了测量。并利用实测材料的热性能，对耐火试验进行了数值模拟。主要结论有：(1)含水率和有效导热系数是耐火材料的重要参数。随着凝胶与珍珠岩砂浆混合比例的增加，试验材料中游离水的质量分数增加。(2)在373 K以上的高温范围内，有效导热系数随珍珠岩与水泥掺量的增加而减小。有效导热系数随凝胶与珍珠岩砂浆掺量的增加而降低。(3)试验材料的最长耐火时间为330分钟。少