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

众所周知，湿法防火材料具有良好的耐火性能。因此，这些材料通常由水泥砂浆和高含水率材料的混合物制成，如硅胶或潮湿的珍珠岩。水的潜热在这些材料的热传播阻力中起着重要的作用。最近，对掺有高吸水性聚合物凝胶吸收氯化钙溶液的珍珠岩砂浆进行了耐火试验，从该防火材料的温度响应得出结论，该材料具有很好的耐火性能。但试验材料的组成固定为凝胶与珍珠岩砂浆的比例为1，凝胶与珍珠岩砂浆的比例为1，珍珠岩与水泥的比例为V_p/V_c=1。这些比例对材料的耐火性能有一定的影响，可能存在最佳的配合比。这就是p…的动机。为了找出决定材料耐火性能的阻燃特性和参数，本研究对V_p/V_c=1和3&V_&lt；Gel&gt；/V_&lt；PM&gt；=1和2的材料进行了导热系数和含水率的测量，并利用所测得的材料的热物性进行了耐火试验的数值模拟。得到的主要结论是：(1)含水率和有效导热系数都是阻燃材料的重要参数。在373K以上的高温范围内，材料的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和珍珠岩砂浆掺量的增加而减小。(3)受试材料的耐火时间最长可达330分钟。较少

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