Свойства доменных гранулированных шлаков, влияющие на качество мелкозернистого бетона

Abstract

RU: Рассматриваются основные свойства доменных гранулированных шлаков и их влияние на качество получаемого мелкозернистого бетона. Приводятся характеристики исследованных доменных гранулированных шлаков металлургического завода им. Петровского. Дается оценка целесообразности их использования в качестве мелкого заполнителя для бетонов.

EN: Statement of the problem. Fundamental properties of fine concrete, affecting its durability and life cycle of article made of it, such as strength, deformability, chemical resistance and others, largely depend on the characteristics of the aggregate used. With decreasing of fineness modulus of aggregate, its influence on the properties of concrete mix and hardened concrete increases. At the same time, both in Ukraine and abroad the problem of shortage of quality natural fine aggregate for concrete exacerbates. Besides, low– quality sand in composition of fine concrete can be replaced by secondary material resources — industrial waste. Application of waste product of ferrous metallurgy — granulated blast–furnace slag is the most effective. As it was stated previously [15], granulated blast–furnace slag in composition of Portland cement concrete acts as an active micro filler.

Its surface layer reacts with calcium hydroxide that is released during cement hydrolysis. This produces an additional amount of calcium hydrosilicate, creating an extremely strong bond of aggregate with cement matrix. This greatly improves adhesive strength of concrete, its corrosion resistance and a number of other physical and mechanical characteristics. Application of slag will reduce the cost of fine concrete and free land areas from slag dumps and improve the environmental situation in the country.

Analysis of publications. A series of works of such scientists as V. I. Babushkin, V. I. Bolshakov, P. P. Budnikov, Yu. M. Butt, A. V. Volzhenskiy, V. D. Glukhovskiy, P. V. Krivenko, V. F. Krylov, V. V. Lapin, A. S. Mironov, I. A. Pashkov, G. V. Pukhalskiy, S. M. Royak, R. F. Runova, N. I. Fedynin, S. V. Shestoperov, S. A. Shcherbak, M. P Elinzon, V. N. Yung and many others, is devoted to studying of the properties of metallurgical slag, and construction materials and articles made on its basis.

The purpose of the work is to examine the basic properties of granulated blast–furnace slag, affecting the quality of fine concrete, in order to identify what kind of slag treatment is the ost appropriate when producing durable concrete.

Conclusions.

1. Studies of basic physical–chemical and mechanical characteristics of granulated blast–furnace slag of Petrovsky works has shown that it can be not only an aggregate in composition of fine concrete, but also a filler that replaces part of a binder. The studied slag has a quality factor of 1,59–1,62 and contains a high number of reactive glass phase in its mineralogical composition.

2. Structure of slag grains is porous; particles are largely vitrified. Pores are predominantly irregular oblong; some of them are through slit–like.

3. Basic physical and mechanical properties of granulated blast–furnace slag have poor performance for dense fine concrete. Granulometric composition does not have the optimal ratio of coarse and fine fractions that causes high voidage and water requirement of the slag. Thus, to improve physical–mechanical and other properties of slag and to produce high–quality strong fine concrete on its base, it is expedient to carry out pre–processing of granulated blast–furnace slag. The most effective, from our point of view, may be its mechanical activation.