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PREPARATION OF WATER-RESISTANT CEMENTITIOUS PRODUCT BY ADMIXING REACTIVE MAGNESIUM OXIDE MATERIAL, MAGNESIUM SULPHATE AND/OR CHLORIDE AND PHOSPHATIC MATERIAL WHICH IS ACTIVATED BY AT LEAST PARTIAL ACIDULATION
PREPARATION OF WATER-RESISTANT CEMENTITIOUS PRODUCT BY ADMIXING REACTIVE MAGNESIUM OXIDE MATERIAL, MAGNESIUM SULPHATE AND/OR CHLORIDE AND PHOSPHATIC MATERIAL WHICH IS ACTIVATED BY AT LEAST PARTIAL ACIDULATION