Methods of introduction of glyoxal-containing additives into foam concrete mixture

The present paper investigates a cement based foam concrete with glyoxal-containing additives which are introduced into the mixture in different ways. The relevance of the given study is conditioned by the necessity to provide the required quality parameters of mixture for transportation and laying the formwork, as well as providing strength and physical characteristics of wall structures for housing construction. Four ways of introducing additives into the foam concrete mixture have been proposed: spraying with 40% glyoxal aqueous solution; joint grinding of sand with crystalline glyoxal in the amount of 0.01% by weight of cement; introduction of crystalline glyoxal into the foam concrete mixture; introduction of a 40% aqueous solution of glyoxal to the foam concrete mixture. The study was conducted in the Laboratory of Tomsk State University of Architecture and Building which is accredited in accordance with the national standards requirements. Glyoxal-containing additives applied within the technology of cement foam concrete of natural hardening contributes to ensuring increased aggregative stability of mixtures and compressive strength at the age of 28 days. The elaborated composition and technology of foam concrete production with glyoxal-containing additives is intended for use in the walls structures as well in monolithic construction as in pre-cast production. (paper)