SU1539183A1 - Method of producing concrete mix - Google Patents

Abstract

The invention relates to methods for producing concrete mixes for the preparation of concrete with high strength and frost resistance. The aim of the invention is to increase the strength and frost resistance. The method consists in pre-mixing the powdered waste of ferrosilicon and TPP ash in the ratio of 30: 1 2, respectively, followed by mixing with Portland cement, aggregate and water. In this case, the concrete mixture contains, wt%: Portland cement 7.6 - 12.8

placeholder 54.9 - 70.6

ash TPP

pulverized waste from the production of ferrosilicon with TPP ash in the ratio of 30: 1 2 10.0 - 26.5

water - the rest. The strength of concrete is 22.5 - 37.5 MPa, frost resistance 150 - 350 cycles, table 2.

Description

The invention relates to the production of concrete mixtures for the preparation of concrete characterized by increased strength and frost resistance.

The purpose of the invention is to increase the strength and frost resistance of concrete.

In the proposed concrete mix, Portland cement 400 and 500 are used. As a filler, both small, for example, natural quartz sand, and large (granite and carbonate rubble and other aggregate), as well as a mixture of small and large aggregate can be used.

Dusty waste from the production of ferrosilicon used in the proposed concrete mix is a finely dispersed system obtained by gas cleaning Ferrosilicon. The composition of the waste, wt.%: Silicon dioxide 80-85, calcium oxide 2-4, magnesium oxide 2-4, aluminum oxide 2-4, iron oxides. The surface area of the waste is 24000-34000, the bulk density is 200 kg / m.

Modification of TPP ash with powdered waste from the production of ferrosilicon is carried out by thoroughly mixing calculated quantities of TPP and pulverized waste. At the same time, the finest particles of dust-like waste penetrate into the unclosed pores of the unburned fuel of the TPP ash and fill them, with the result that water absorption by TPP ash during the preparation of the concrete mix sharply decreases.

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The proposed concrete mix is prepared as follows.

First, by thoroughly mixing the calculated amounts of TPP ash. and powdered waste from the production of ferrosilicon, they modify the ash of thermal power plants. Then, a dry mixture is prepared by a known method, for which the calculated J quantities of Portland cement, TPP ash modified with powdered waste of the production of ferrosilicon, and a filler are sequentially mixed. At the end of mixing these components, the calculated amount of mixing water is introduced into the prepared dry mixture. The concrete mixture prepared in this way is molded into articles and subjected to heat treatment according to the following conditions: 2 hours - preliminary exposure; 3 h - drink temperature; 6-8 h - isothermal aging at 9015CC and 2 h - cooling. The isothermal holding time (6-8 h) depends on the thickness and type of concrete products.

In tab. 1 shows the compositions of the proposed concrete mix, and table 2 - the properties of concrete.

Claims (1)

Invention Formula A method of preparing a concrete mix by mixing Portland cement, aggregate, TPP ash, dust-like ferrosilicon waste and water, characterized in that, in order to increase the strength and frost resistance of concrete, TPP ash and dust-like waste from the production of ferrosilicon are mixed in the ratio respectively (2-Sp) : 1, while the ratio of the components of the concrete mixture is, wt.%: Portland Cement Filler The specified mixture of powdered waste of production of ferrosilicon with ash TPP Water 7.6 - 12.8 54.9 - 70.6 10.0 - 26.5 Else. Portland cement U-4001909.37 372.8 1.19 Natural quartz sand1038.4 51.18 Quicklime 50,12,36 Ash TPP, modified dust dust production of ferrosilicon, with a ratio of the mass of ash TPP and dust-like waste 1.5: 1 Water Portland cement M-4001909,53 222.3 0.95 Natural quartz sand Lime of quick carbon Zola TPP, modified with dust-like waste from the production of ferrosilicon, with a ratio of the mass of ash from thermal power plants and dust-like waste 2: G52726,42 Water1809.43 Portland cement M-4001909,57 141.9 0.95 Natural quartz sand1037.6 52.27 Lime of quicklime 50,12,54 Ash TPP, modified dust of waste production of Ferrosilicon, with the ratio of the mass of ash TPP and dust Table 1