DRY MIXTURES

[:ru]Белов В. В.[:en]Belov, V. V.[:] [:ru]д. т. н., проф., проректор по инновационному развитию ФГБОУ ВО «Тверской государственный технический университет», заведующий кафедрой производства строительных изделий и конструкций, Тверь, Россия[:en]Dr. Eng. Sc., professor, vice-rector of Tver State Technical University, Head of the Department of Building Products and Structures Manufacturing, Tver, Russia[:]

Alitinform №1 (08) 2009 г. 74-84 p.

Abstract

Many industries, first of all, building and road-building ones need theoretically based, easy and practically applicable methods for calculation of raw materials’ mixtures composition. Lately, development of theoretical aspects of designing different types of concrete including new types, such as fine, decorative, nonshrinking, coarse-porous, and others, has been connected in many respects with works of Russian scientists specializing in concrete technologies. There are Yu.M. Bazhenov, B.V. Gusev, P.G. Komokhov, V.S. Lesovik, A.P. Proshin, R.Z. Rakhimov, I.A. Rybiev, V.I. Solomatov, Ye.M. Chernyshov among them as well as many others. Those works created a basis for development of computer modeling and designing optimal compositions for different types of concrete and building mixtures as a whole. Additional opportunities for selecting optimal compositions for manufacturing construction materials with the use of modern computers and new physical principles can be opened on basis of development of calculation methods for optimal granulometric compositions of mineral components of raw materials’ mixtures. These components are aggregates (coarse and fine), fine-dispersed fillers as well as mineral binding agents.

It is known that a proper choice of granulometric composition of filling aggregates for construction mixture ensuring their minimal voidage, that is maximal packing density of grains, is one of core tasks of construction materials technology. Voidage of an aggregate is an important parameter, because it determines, to some extent, cement consumption (the more pores are in an aggregate, the more cement is required to fill them, and relatively less cement is in stronger film state), and consequently the strength and other properties of concrete.