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Refractory mortar is used in the preparation of block construction ceramics.The working capacity of such articles is mainly assessed by the quality of the joints which is provided by a combination of properties in the mortar that is used, and especially its cementing properties and its thermal shock resistance.One of the main factors affecting the cementing strength of the mortar after high-temperature treatment is the composition of the filler in the refractory mortar, which should be close to the chemical composition of the material being cemented.The present work was concerned with a study of a refractory mortar having a mullitecorundum-zirconia composition with a phosphate bond for cementing mullite-corundum blocks, corundum and chamotte (fireclay) bricks.The blocks were made by water casting of mullite containing suspensions with the introduction of finely milled electrocorundum.The properti~ of the blocks were described in [i].The composition of the refractory mortar contained mixed filler in the form of components present in the composition of the cemented specimens: mullite-corundum chamotte, and alumina, In order to increase the plasticity we added fireclay, and to increase the thermalshock resistance --zircon.All the components were added in the finely dispersed (minus 0.08 mm) state which contributed to the more complete reaction with phosphate binder, and moreover, enabled us to obtain thinner joints which is especially important in the creation of construction products.The investigation involved using refractory mortar containing mullite-corundum powder together with alumina (47%), zircon (20%), fireclay (4%), and aluminoborophosphate bond (ABFS) with a density of 1.56 g/cm 3 (TU 113-08-10-17-83).Before use the bond was diluted to a density of 1.40-1.45 g/cm 3, and was added in amounts of 29%, which ensures the necessary consistency.After careful mixing the solution was applied in a thin layer to the surface of two articles to be bonded.The excess mortar was pressed out during placement.

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