コンクリート壁の耐火性能に及ぼす調合と含水率の影響

概要

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Variations of the fire resistance of concrete walls were numerically analyzed using a model of heat and mass transfer. The analysis was made in two steps. In the first step, the material properties such as thermal conductivity and density were estimated based on the mix design. Then, in the second step, the values are used in the model of heat and mass transfer, which gives the estimate of fire resistance time. By repeating this procedure, the variation due to the mix design of concrete was quantified. In a similar way, the variation due to the change of initial water content was also quantified. As a result, the effect of mix design dominates the variation of fire resistance of concrete. The effect of initial water content is small compared with that of mix design. Thus the effect can be approximated by a liner relationship as 3. 3 minutes per 1% change in initial water content in case of 70 mm thick walls. By using this result, a diagram was presented to show the range of acceptable mix design for the required fire resistance time.
社団法人日本建築学会の論文
1996-03-30