SU1294780A1 - Raw mixture for producing lightweight concrete - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to compositions of light concrete mixtures for the manufacture of enclosing structures. The aim of the invention is to increase the strength and frost resistance of concrete. The raw material mixture includes, in wt.%: Low-clinker slag Portland cement 12-18, slag aggregate of the fraction; 10 mm 54-64, O2 sulfite brew, 15-0.3, sodium alkyl sulfate 0.01-0.3, ammonium carbonate 0, 2-0.8, coal ash 14-16, water is the rest. 2 tab. about 4 00

Description

The invention relates to mixtures for the manufacture of products from lightweight concrete.

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

Light concrete mix, including low-clinker slag Portland cement, coal ash, slag aggregate of $ 10 mm fraction, secondary alkyl sodium sulfate, inorganic acid salt and water, contains ammonium carbonate as an inorganic acid salt and additionally a sulfite-yeast mash in the following ratio of components, May.

slag portland

ment12-18

Coal Ash14-16

Slag aggregate fraction

ilO mm54-64

Secondary alkyl. - sulfate 0,01-0,3

Ammonium carbonate 0, 2-0,8 Sulfite yeast brew 0.15-0.3 Water Else As a result of its hydrolysis and interaction with the products of cement hydration, the formation of the gas phase (ammonia, carbon dioxide), which is combination with an alkyl sulfate frother is a mixture porizer. Mix feature

It consists in the fact that the complex additions are carried out in a known way, consisting of alkyl sulfate, in a coal by passing compressed air (2-3 atm) into it through a microporous material.

ammonium sulphate and DMB, taken in the indicated ratio, have a strong plasticizing effect and allow to porous hard slag mixture with reduced water content.

niem (In / C). Characteristic properties of the combination in a mixture of additives in the presence of ash are also the inhibition of the process of gas generation and high gas holding capacity, which allows to preserve the gas phase during transportation and laying of the mixture. In this case, the pore structure of concrete is characterized by an increased number of closed (reserve) pores. These factors provide increased frost resistance of concrete. The latter also increases due to the interaction of carbon dioxide with calcium hydroxide (a product of cement hydration) with the formation of calcium carbonate, which seals the interpore partitions. These features of the mixture make it possible to produce concrete of high frost resistance even when using low-active pipe-dispersed ash with a high content of unburned fuel particles.

To obtain comparative data under the same conditions, the preparation of equal-moving mixtures (immersion of a standard cone of 2-3 cm) is carried out in a known manner in a turbulent mixer and the molded samples are steamed at 95-100 ° C according to the 3 + 10 + 3 h mode. bulk mass with the proposed mixture; samples from a known mixture are prepared in a conventional mixer without porosity of the mixture in a turbulent mixer with porous mixture (porous slag concrete). Porisation of the mixture in the process of mixing0

five

0

35

Vanilla is carried out in a known manner.

bom by supplying compressed air (2-3 atm) into it through a microporous material.

Specific examples of mixtures and their physico-mechanical indicators are given in Tables 1 and 2.

Table 1

As can be seen from Table 2, the lightweight concrete from the proposed mixture is characterized by higher strength and frost resistance compared to light (porous) concrete from a known mixture with the same bulk density.

The proposed mixture allows to obtain lightweight concrete with a higher strength and frost resistance compared to the known mixture when used, power plant ash, as well as additives for SDB, alkyl sulfate and ammonium carbonate, as well as more widely and efficiently using power plants and slags in the production durable products from lightweight concrete.

In addition, the proposed mixture can be used at existing and projected plants and workshops for the manufacture of enclosing structures made of lightweight concrete.

Compiled by O. Motorina Editor N. Gunko Tehred L. Oleinik Proofreader M. Samborska

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VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Invention Formula Raw mix for making lightweight concrete, including low-clinker slag portland cement, slag aggregate of 10 mm fraction, sulphite-yeast mash, additive and water, which in order to increase the strength and frost resistance of concrete, it contains sodium alkyl sulfate and Ammonium carbonate and additionally coal ash in the following ratio of components, May Low clinker osha- coportland cement 12-18 Slag aggregate of 10 mm fraction 54-64 Sulfite yeast cream, 15-0.3 Alkyl sulfate sodium 0.01-0.3 Carbonate ammonium 0.2-0.8 Coal ash 14-16 Water Else