STP385

    Effect of Moisture on the Fire Endurance of Building Elements

    Published: Jan 1965


      Format Pages Price  
    PDF (648K) 22 $25   ADD TO CART
    Complete Source PDF (5.0M) 22 $55   ADD TO CART


    Abstract

    The effect of moisture on the performance of building elements in fire is closely related to the amount of moisture, and in turn, to the sorption characteristics of materials. High moisture content may result in spalling. The probable mechanism of moisture clog spalling is discussed, and a criterion is developed for the fractional pore saturation at which spalling can be expected (Eq 8). if spalling does not occur, the presence of moisture is beneficial for the fire endurance. An empirical equation has been found which correlates the percentage gain in fire endurance due to 1 per cent moisture with the fire endurance in the dry condition (Eq 20). A nomogram is presented to facilitate estimation of the effect of moisture on thermal fire endurance (Fig. 9). Possible utilization of the results in the field of fire endurance testing is discussed.


    Author Information:

    Harmathy, T. Z.
    Research officer, National Research Council, Ottawa,


    Paper ID: STP48429S

    Committee/Subcommittee: E05.13

    DOI: 10.1520/STP48429S


    CrossRef ASTM International is a member of CrossRef.