RU2104986C1 - Method of preparing concrete mix - Google Patents

Abstract

FIELD: manufacture of building materials, more particularly manufacture of prefabricated reinforced components and structures. SUBSTANCE: claimed method comprises stirring cement, superplasticizer, molding mixture and granular slag for 40 min at mechanical effect power of 120 w/kg and at wt % ratio of compounds of (30-50): (0.5-2.0):(20-40):(8-49.5) and subsequently stirring with filler and water. The claimed method is advantageous over prior art method in that it allows increasing strength by 10% and attain utilization of up to 0.2 t of slag per 1 cubic m of concrete. EFFECT: more efficient preparation method. 2 tbl

Description

 The present invention relates to a method for the production of building materials, to the technology for preparing concrete mix and can be used to obtain monolithic and prefabricated products from concrete and reinforced concrete.

A known method of preparing a concrete mixture by mixing cement with dust from the production of silicon alloys (S _{specific dust} = 12000 cm ² / g) in a ratio of 9-24: 1-5 and fine aggregate, followed by mixing with large aggregate and water [1].

 The aim of the invention is to increase the compressive strength of concrete, reducing cement consumption.

 This goal is achieved by the fact that before preparing the concrete mixture, cement is pre-mixed, the spent molding mixture — foundry waste, superplasticizer and granular metallurgical slag for 40 min at a mechanical power of 120 W / kg in the following ratio of components, wt.%: (30-50): (20-40): (0.5-2.0): (8-49.5).

Example. Materials:
C-3 type superplasticizer (in powder form) based on the neutralized products of petroleum sulphonic acid and formaldehyde:
Portland cement with an activity of 41.2 MPa;
granite washed gravel fractions of 5-10 mm;
quartz sand M _cr. = 2.3;
drinking water tap.

 Joint processing of cement, molding sand, superplasticizer and slag can be carried out in any grinding device - ball mill, rod mixer, vibro mill, evaporator, etc.

 As additives, molding sand and slag - foundry waste are used. The molding mixture is a fine-grained substance of black color. Slag is a glassy, fine-grained material. The chemical composition of the materials is given in table. one.

 The concrete mixture is prepared in the following sequence: first, a joint grinding of cement, superplasticizer, molding sand and slag is carried out, after which the binder is mixed with fine and coarse aggregate, as well as water.

 The method of preparing the concrete mixture according to the invention allows to obtain heavy high-strength concrete using cements of ordinary grades, reduce the consumption of binder, and involves the disposal of a significant amount of foundry waste at the metallurgical industry.

 The test results are summarized in table. 2.

Claims (1)

 A method of preparing a concrete mixture, including pre-mixing cement with a silica-containing component and subsequent mixing of the resulting binder with aggregates and water, characterized in that the cement, the spent molding sand, the foundry waste, superplasticizer and granular slag of metallurgical production are subjected to preliminary mixing at a ratio of respectively, wt. . (30 50) (20 40) (0.5 2.0), (8 49.5), while stirring is carried out for 40 min at a mechanical power of 120 W / kg.

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