The permanent volume changes of the siliceous fireclay mortar before,during and after drying are studied by experiments.The siliceous fireclay mortar joint accounts for 4% of overall height of coke oven masonry,and the great influence of the volume change on whole oven  proper structure must be paid attention to.With the development of large-scale coke ovens,looking for optimal formulas for siliceous fireclay mortar will be the research direction,which will reduce the uncertainty of volume expansion in the future.

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