SU571450A1 - Method of preparing concrete - Google Patents

Description

one

The invention relates to the building materials industry.

There is a known method for manufacturing concrete products based on slag-in-living with alkaline activators l.

There is also known a method for preparing a concrete mix by mixing ground granulated slag, a mineral aggregate and an alkaline component 2. This method is the closest to the invention in its technical nature and the result achieved

The disadvantages of the known methods include the low strength, heterogeneity and fragility of concrete and its products.

The purpose of the invention is to increase the strength, uniformity and durability of concrete.

This is achieved by pre-mixing the natural moisture mineral aggregate with the alkaline component in the form of dry salt with a particle size of not more than 2 mm for 30-60 seconds, after which ground slag and water are introduced and the final mixing is carried out.

Using the method, a given ratio is provided between the alkaline component and ground slag at a non-variable moisture content of the aggregate, as well as at different water content of ground slag introduced in the form of sludge.

By introducing an alkaline component into the mixture in the form of a dry salt, a concentrated solution of alkali is created, collapsing, nodding the aggregate grains, which causes it (activation, aggregation of colloid-dispersed silt and clay aggregate particles.

Example. To confirm the effect, the results of testing the strength and frost resistance of concrete samples made according to the known and proposed method are compared.

The composition of the concrete mix for samples made using the known and proposed method is the same and is determined by the following material consumption (weight%):

Ground Slag 7.4

Soda Technical i J

Quartz sand31, h.

Limestone crushed stone 40.0 Mobility of concrete slag 2-3 cm with a water-slag ratio equal to O, i

The dosing of the alkaline component by a known method is g-O production in the form of a solution of density i, i, / cm. By

the proposed method, the alkaline component is dosed in the form of dry salt.

Samples of 10x10x10 cm are made from a 5-ton mixture, which are steamed

mode 3 + 6 + 3 hours at a temperature in the isothermal period of 80 ° C.

The test results are shown in the table.

Compressive strength, kgf / cm Coefficient of variation of concrete strength,% Frost resistance coefficient Coefficient of variation

Claims (2)

Frost resistance coefficients,% Comparison of test results shows an increase in concrete strength under compression by 16%, an increase in frost resistance, as well as homogeneity of concrete in terms of strength and frost resistance. The invention of the method for preparing a concrete mixture by mixing ground granulated slag, mineral aggregate and shelling component, is used in order to increase 367 406 14.5 2.1 0.89 0.95 24.7 2.1 shene strength, uniformity and durability of concrete, mineral aggregate is pre-mixed with the alkaline component in the form of dry salt for 30-60 seconds, after which ground slag and EO is introduced and final mixing is carried out. for espertise: 1. Ox, Kensky A.V. and others. Concretes and products from slag and ash materials M. Stroy: date, 1969, p.154-155. 2. Glukhovsky V.D. Soil silicates, Kiev, Gosstroyizdat, 1959, pp.79-80.