Firing and Cooling Shrinkage Behavior of Structural Clay Bodies

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Abstract
Length change determinations on nineteen sewer pipe bodies were used to study the shrinkage of structural clays. Determinations over both heating and cooling cycles were included. Many of these materials are used in the production of other structural clay products and they represent mixes of shales and clays commonly used throughout the industry. The data consequently are of interest to all producers of structural clay products. A description of the techniques employed in securing the data, as well as a discussion and interpretation of the results, is given. Particular emphasis is placed on the possibility of conserving fuel and firing time, as well as reducing rejects, by applying information obtained. It was found that nearly all the shrinkage occurs in a very small portion of the total firing cycle, and that there are periods of slight volume change where considerations of shrinkage are of small consequence in firing.

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