Increasing the resistance of magnesium foam concrete to vapor sorption

This paper is aimed at studying the possibility of lowering the sorption humidity of cellular chlormagnesium composites based on a binder with a low content of magnesium oxide. The relevance of the research has been determined and the causes for the increased indicators of sorption humidity in magnesium cellular concretes have been given. A method for modifying the structure of magnesia stone in the composition of foam concrete by introducing an additive of nickel slag containing free divalent and trivalent iron ions has been proposed. Results of a study on the phase compositions of the initial and modified chlormagnesium foam concrete by differential thermal and x-ray analysis of samples on the 28th day of hardening are presented. The presence of cation exchange (magnesium-iron) was observed at hardening of a cellular chlormagnesium composite modified with nickel slag. The main physical and mechanical characteristics of the initial and modified compositions of magnesia foam concretes have been compared. It has been stated that the investigated composition of magnesia foam concrete modified with nickel slag has indicators of sorption humidity that meet the requirements of current technical regulations.