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

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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