SU1002268A1 - Method for preparing concrete mix - Google Patents

Description

(5 "t) METHOD FOR PREPARING A CONCRETE MIXTURE

1 The invention relates to the field

Chemistry, to the production of slag-based concretes based on concrete.

A known method for the preparation of slag alkaline C 3 concrete, in which the mineral aggregates and ground slag are loaded in a concrete mixer in a certain proportion, are mixed, then the mixture is mixed with an aqueous solution of the alkaline component, and the whole mixture is mixed until one is obtained (5 masses).

The closest to the invention of the technical essence and the achieved result is the method of preparing a concrete mix in which first all the aggregate and alkaline component in the form of dry salt are mixed for 30-60 seconds, after which ground slag and water are introduced, and the final mixing f 21.

The disadvantage of this method is the incomplete dissolution of dry salt.

alkaline component, inhomogeneous concrete mix and low strength of adhesion of the aggregate with the stone in motion.

The aim of the invention is to increase adhesion to the aggregate, strength, uniformity and density of concrete.

The goal is achieved by that; that according to the method of preparing the concrete mixture by mixing ground granules of the developed slag, mineral aggregate, alkaline component and mixing water, the large aggregate is pre-mixed with the alkaline component and 60-701 mixing water for 1.0 -1.5.5 minutes, after that, fine aggregate, ground slag, and the rest of the mixing water are introduced and the final stirring is carried out for 2-3 minutes, until a homogeneous mass is obtained.

With this method, the first stage of mixing is washing

crushed stone in an alkaline solution, which allows the clod or clay coating film to be washed off the coarse aggregate grains. Clay particles being an alkaline solution, do not interfere with the adhesion of the stone bearing to the aggregate, but on the contrary hydrate into an alkaline solution with the formation of alkaline hydroaluminosilicates, which possess the adhesive properties and compact the structure of the concrete. In addition, the surface of the aggregate grains is activated in an alkaline medium, which, 8 turn, increases the adhesion of the crushed granulated slag with a specific surface 3200 25.3 20.1

Soda Ash Technical

Sodium metasilicate

Granite crushed stone

mm fractions

containing clay particles

1.35%

The same crushed stone previously washed with a clay content of 0.12%

Sand Dnieper with module large Each of the compositions was prepared according to the invention and the known method with mixing at the first stage for 1.0 min, or 1.5 and at the second

n in the trick with filler. The additive introduced into the mixture with the rest of the mixing water at the second stage of mixing is well distributed in the substance, its contact with the alkaline component occurs already in the mixture, which allows the use of various inorganic and organic additives.

To test the method and compare it with the known, various slag-alkali mixtures were made. The characteristics of the materials and their ratio are given in table. B.

Table 1

20.1

1.5

,one

2 or min. The results of testing samples after 28 days of curing under normal conditions are presented in Table 2.

Table 2

Claims (1)

The claims ⁵¹ A method of preparing a concrete mixture by mixing ground granulated slag, mineral aggregate VNIIIPI Order 1716/8 of a body, alkaline component and mixing water, characterized in that, in order to increase the adhesion of the binder to the aggregate, the strength, uniformity and density of concrete, the coarse aggregate is pre-mixed with alkaline component and 6070% of mixing water for 1, ΟΙ, 5 minutes, after which fine aggregate, ground slag, detailed water are introduced and final mixing is carried out for 2-3 minutes to obtain homogeneous mass.