SU881051A1 - Concrete mix - Google Patents

Description

The invention relates to building materials and products, namely, concretes, mortars and mastics, containing tough, coarse and fine aggregates and water, and used for the manufacture of building structures of scientific research institutes and structures in the construction and repair of factories that have fluorinated corrosive media. Concrete mixes are known, containing as granular, diabase, basalt rubble, fine - quartz sand and, in general, such concrete have very low corrosion resistance in fluorine-containing solutions 1. As closest to the invention as to its technical essence and the achieved result is a concrete mixture containing portland cement, coarse and fine aggregate of carbonate rocks of genus 2. The known concrete mixture has a drawback that the value is not high enough corrosion resistance. The purpose of the invention is to increase the corrosion resistance of concrete in fluorinated corrosive environments. The goal is achieved by the fact that a concrete mixture, including cement, coarse and fine aggregate of carbonate-containing rocks and water, contains alumino-iron cement as a mortar in the following ratio of components, wt.%: Aluminum-iron cement14-75 Coarse aggregate 0.5- 47 Fine aggregate 0.5-24 Water Remaining Cemented iron and alloys is a solid, consisting of the following minerals, wt.%: Calcium alumoferrite 36 Shelly altered

alumoferrite 46

Dicalcium

ferrite2

Dicalcium

silicate

up to 100%

P r and m er. Concrete mixes are prepared, the coctaBM of which are listed in Table. one.

Each mixture is prepared in a separate manner. Coarse and fine carbonate-containing aggregates are prepared from crushed; dolomite fractions: 20, 15, 10 and 5 for crushed stone 2.5; 1.25; 0, b35 0.315; 0.14 mm for sand. The weighed amount of aggregate (coarse and fine) is thoroughly mixed with water, after which the iron-and-iron cement is introduced. Stirring is continued for another 5 minutes, and the ready-mixed concrete

placed in a form 10x10x10 cm on the vibrating table. After 12 hours, samples are dismantled, which are immersed in water for subsequent hydration for 28 days.

The grade of the proposed concrete ranges from 50 to 200 (see Table 1). Corrosion resistance is determined on small 2x2x8 cm bead specimens using the Kind method. Data on the corrosion resistance of the proposed and known concrete are given in Table. 2

From tab. 2 shows that all the compositions described, prepared on the basis of alumino-iron cement and carbonate-containing aggregates, have a corrosion resistance coefficient after 6 months. exposure to fluorinated corrosive media is greater than one, and in the known one is much lower.

Claims (2)

Table 1 7 88105 Formula of the invention. Concrete mix, including cement, coarse and fine aggregates of carbonate-containing rocks, and water. characterized in that, c5, in order to increase the corrosion resistance of concrete in fluorinated corrosive environments, it contains aluminosilicate cement in the following ratio of components, wt.% gU aluminum ferrous cement 14-75 coarse aggregate 0.5-47 18 fine aggregate 0.5-24 Water Else Sources of information taken into account during the examination 1. Corrosion of concrete in terms of cryolite production. - Lime Universities, Ser, Construction and Architecture, 1976, No. 10. 2. Gershberg 0. A. Concrete and reinforced concrete products technologists. M., 1971, p. 88