Study of deformation properties of alkali activated concretes using active aggregates

Abstract

Abstract Results of study of deformation properties of fine-grain concrete are shown using slag alkali activated cement and active aggregate. It had been shown that expansion deformations of specimens, supplying process of alkaline corrosion of aggregate in concrete, directly combined with component composition and conditions of hardening of material. It was shown that using alkaline component in the state of dry salt shrinkage deformations are varying in the shorter ranges comparing to concrete with the soluble glass. Introduction of active mineral admixture leads to the decreasing of deformations comparing to the compositions without admixture. Different conditions of hardening of the specimens are also influence well on the development of shrinkage deformations. It is shown that drying of specimens with active process of alkaline corrosion of concrete makes it possible to stop development of expansion deformations in concrete. Hydrophobization of the dried specimens make it possible to store linear characteristics of specimens. Hydrophobization of without drying leads to the intensification of structure formation processes and higher rates of development of deformations. Traditional method of protection of concrete constructions (covering by painting materials) is not able to prevent, but also possible to activate development of destructive processes of alkaline corrosion of concrete.