[中文摘要]

本研究探討多孔質和纖維質兩類型的被覆材料，在含水率、孔隙結構、高溫熱傳導係數等因子與耐火性能之關係。由研究結果顯示：被覆材料中之含水率與擴散行為有密切關係，與其試體厚度和養護濕度成正比關係。試體內水分受熱後往內層擴散最後聚積在鋼板表面，直到完全沸騰汽化，因此形成鋼板溫度停滯在100 ℃的現象。含水率較高的試體，會有較長的遲滯時間，但水份蒸發後會形成較高的孔隙率，對耐火性能有不利的影響。試體中之孔隙結構，隨溫度升高，孔徑及孔隙率皆增大。密度與熱傳導係數之關係可以分三個溫域說明，在低溫域時密度較低者，有較低的熱傳導係數；在中溫域時，隨著溫度升高，密度較低者逐漸會有較高的熱傳導係數；在高溫域時，孔隙內熱輻射的效應增大導致在高溫域時的熱傳導係數陡升，熱傳速率增大。組成中化學成分吸熱分解的過程，可使熱傳導係數增量較小。在本文中迴歸二類型被覆材料之熱傳導係數與溫度變化，可以線性關係表示。

[英文摘要]

The research is to study two types of sprayed fire-resistive material – porous and fibrous types, with regard to their relationship among the factors such as moisture content, pore structure, high temperature thermal conductivity and fireproof capacity. The research results indicate, in the sprayed fire-resistive material, there has a close relationship between moisture content and diffusive behavior, and there has positive relationship between the specimen thickness and curing humidity. After heated, moisture in the specimen will diffuse inwardly and finally accumulate on the steel plate surface until it has been totally boiled and vaporized, and therefore a sign that steel plate temperature has a delay at 100℃ is found.　The specimen with higher moisture has a longer delay time but porosity after moisture vaporized has bad influence to fireproof capacity. Pore structure in the specimen will have an increase in respect of pore size and porosity following the increase in temperature. The relationship between the density and thermal conductivity may be explained through three different temperature ranges – when at low temperature and with low density, there will have low thermal conductivity; when at medium high temperature, following the rise in temperature, the one with lower density will gradually have higher thermal  conductivity; when at high temperature, radiation in the pore will be increased to result in sharp increase in thermal conductivity and the increase in heat transfer at high temperature. Chemical ingredient of composition heat absorbing and disintegrating process may cause smaller increase in thermal conductivity. In this research, digression of two types of sprayed fire-resistive material may use linear relationship for representing the thermal conductivity under changing temperature.