Published: Jan 1956
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The resistance of hardened concrete to fire and radiation has attained considerable importance during the past several years and has become a matter of great concern. The problem extends far beyond that of subjecting concrete and other materials to heat in accordance with the time-temperature curve specified in the ASTM methods for fire resistance of building construction; it now embraces other exposures more severe and more complex in nature. In the past, studies have been made on the use of concretes for furnaces and refractories, especially in connection with the promotion of expanded light-weight aggregates and high-alumina cement. The atom bomb (1) and its terrific heat and blast stirred up great interest insofar as security regulations permitted dissemination and discussion of data on the resistance behavior of concrete to fire and radiation. The advent of the jet engine, JATO, rockets, and guided missiles opened up additional fields of concern. In these also much of the data as to the degree of blast and heat remains classified and is in many instances affected by each new development that occurs. It is evident, therefore, that classification of concretes according to their ability to resist these forms of thermal shock is a very difficult task: first, the type of exposure must be known, and second, the degree and duration of exposure must be established.
Director, U. S. Naval Civil Engineering Research and Evaluation Lab., Port Hueneme, Calif.
Paper ID: STP39433S