SU1698231A1 - Light-weight concrete mix - Google Patents

Abstract

This invention relates to light concrete mixes on porous slag aggregates for the manufacture of wall products. The purpose of the invention is to reduce the consumption of cement, density and thermal conductivity of concrete, - For this light-weight concrete mix contains (wt.%) Slag Portland cement - 5.3-10.5; hydraulic additive in the form of finely ground glass-slag gravity fraction of 5 mm - 3.4-6.4; porous aggregate in the form of glass-slag gravel 10-20 mm-29.6-25.24; fractions of 5-10 mm - 17.9-22.9; fractions of 5 mm - 29.1-32.1; air entraining additive - 0.46-0.56 and water-rest. Such a mixture composition makes it possible to reduce cement consumption by 10–40%, density by 3–7%, and thermal conductivity by 30%. 1 tab.

Description

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The invention relates to building materials, namely, light concrete mixes on artificial porous aggregates, and can be used in the manufacture of wall products for residential, industrial, public and agricultural buildings.

The purpose of the invention is to reduce the consumption of cement, density and thermal conductivity of concrete.

Light concrete mix, includes slag Portland cement, porous slag aggregate of fractions 10-20, 5-10 mm and fractions 5 mm, air-entraining additive and water; moreover, it contains as a porous slag filler glass-slag gravel of 10-20, 5-10 and 5 mm fractions and additionally a hydraulically active additive, obtained

grinding glass slag gravel fraction 5 mm, in the following ratio, wt.%:

Slag Portland Cement5.3-10.5

Hydraulic additive from finely ground glass-slag gravel fraction 5mm3.4-6.4

Glass Slag Gravime Fraction; 10-20 mm29.6-25.24 j

5-10 mm17,9-22.9

5mm29.1-32.1

Air entraining additive. 0.46-0.56 Water Remaining To obtain concrete from these materials, slag-and-cement-concrete mixtures of 8 compositions were prepared, porous with an air-entraining additive (wood resin 5% concentration)

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tion) with a flow rate of 0.2% by weight, per unit (in terms of the dry substance of the additive).

In compositions 1-6 (according to the invention), glass-slag gravel (GSP) from the Novolipetsk Metallurgical Combine of fractions 10-20, 5-10 and 0-5 mm was used as a porous slag aggregate, characterized by the following average values for a mixture of fractions 5-20 mm: dry bulk density Usuhn.n 600 kg / m3, strength when shedding, infused in the cylinder Oss.d. 1.2 MPa, intergrain hollow PM 49.1%, thermal conductivity coefficient in backfill А3ас. 0.139 W / (m K); glass-slag gravel with a fraction of 5 mm, ground to a specific surface, Itch “3000 cm2 / g.

The consumption of components per 1 m of concrete in these compositions is as follows: M400 shlakokortland cement, kg 100 to 200

Grinding agent additive, kg from 50 to 150 FGD fractions of 10-20 mm, l: from 470 to 560 5-10 mmt 430 to 340

0-5 mmt 600 to 550

i.v.d.-SDO,% from the weight of the substance (based on dry substance),% from 0.15% to 0.2. In compositions 7 and 8 (according to the prototype), gravel-like slag pumice stone (HSP) of 10-20, 5-10 and 0-5 mm fractions were used as a coarse aggregate with averaged characteristics for a mixture of 5-20 mm fractions: dry: 600 kg / m5 ; as.d. 1.4 MPa; PM - 52.54%; Azas. 0.155 W / (m K).

The consumption of materials for 1 m of concrete in these compositions was taken as follows:

Slag Portland cement M400 -210i240

HSP fraction 10-20 mm, 340 l and 380 fractions 5-10 mm560 and 540

fractions 0-5 mm560

VVD-SNV 5% concentration,% by weight of cement0.1; 0.15; 0.2 Consumption of mixing water for the preparation of all compositions was assigned, based on the desired workability of concrete mixtures to obtain a hardness of 20 seconds.

Each composition was prepared separately in a forced concrete mixer using the following technology: a large porous slag aggregate, slag / aggregate sand, finely ground additive from glass slag grains were sequentially loaded into the mixer. 5 mm (in the proposed formulations), cement, mixing water and gr. Mixing time is 3-4 min. The prepared mixtures were molded in 6 cubes with a 15-cm-edge and 3 plates of 25x25x5 cm to determine, respectively, the compressive strength of concrete. R28. heat conductivity coefficient in a dry state (in the state of operating humidity (ov 5%). Samples were subjected to TVO in a steam chamber according to (4) + 3 + 8 + 3 h at bz. 90-95 ° C.

The test results of the samples shown in Table 1 show the advantage of the lightweight concrete mixture according to the invention in comparison with the prototype. The advantages are in reducing the required cement consumption from 210 to 100 kg (for concrete class B3.5) and from 240 to 1-60 kg per 1 m of concrete (for class B5), reducing the density of concrete by 50-80 kg / m3, a decrease in the heat conductivity coefficient of concrete in the dry state by 10.3–13.2% and in the state of operating humidity by 9.8–11.1%. This leads to the conclusion about the efficiency of using glass slag gravel instead of gravel-like slag pumice as a porous slag aggregate in concrete.

Claims (1)

The invention is a lightweight concrete mixture comprising slag portland cement, porous slag aggregate of fraction 10-20, 5-10 mm. and a fraction of 5 mm, an air entraining additive and water, characterized in that, in order to reduce cement consumption, density and thermal conductivity of concrete, it contains as a porous slag aggregate glass-slag gravel of fractions 10-20, 5-10 and 5 mm and additionally hydraulically active additive obtained by grinding glass-slag gravel 5 mm, with the following ratio of components, wt.%: Slac Portland Cement5.3-10.5, Hydraulic additive from finely ground glass-slag gravel fraction 5mm 3.4-6.4, Glass Slag Gravel Fractions: 10-20 mm29.6-25.24. 5-10 mm17.9-22.9. 5mm29.1-32.1. Air entraining add 0.46-0.56; WaterEverything -Note. Glass slag gravel with a fraction of 4–5 mm, previously ground to a specific surface area of Syg 2800–3000 cm2 / g, was used as an additive for ground slag. As a porous slag aggregate, the following were used: in the inventive compositions (1-6) - glass-slag gravel of fractions 10-20, 5-Ю, 45 mm; in the compositions of the prototype (7.8), ra is similar to slag pumice FR “10-20, 5-S and 45 mm.