SU983101A1 - Concrete mix - Google Patents

Description

(54) CONCRETE MIXTURE

The invention relates to the field of construction materials, namely, to the composition of concrete mixes. Polymer-containing additives, and can be used in the preparation of concrete structures made of concrete and reinforced concrete. A concrete mix is known that includes a mineral binder, aggregates, water, aluminum powder, and a polymer additive. Acetone-formaldehyde resin is used as a polymeric additive in an amount of 0.1-5% by weight of dry materials I. The disadvantage of this concrete smear is a rather early loss of plasticity, which negatively affects the final strength characteristics of concrete. Closest to the invention of the technical essence and the achieved result is a concrete mix, including cement, acetone-formaldehyde resin, caustic soda, coarse and fine aggregates, water at the following ratio, wt.%: Cement 15-50 Acetone formaldehyde resin. 0.3–10.0 Caustic soda 0.1–1.0 Coarse aggregate 30–34 Fine aggregate 20–22 Water Remaining The specified concrete mixture allows to obtain concrete products with improved indicators of mechanical strength and resistance to aggressive media 2. However, the mixture is known It is characterized by poor plastic properties that make it difficult to manufacture products with identical indicators, and when random equipment stops, the concrete mixture becomes unsuitable for use. The aim of the invention is to improve the workability of the mixture, increasing the strength and density of concrete. This goal is achieved by the fact that a concrete mixture including cement, acetone-formaldehyde resin, caustic soda, KpjoiHbm-H

shallow sprays, water, contains addition of 1% water solution of hydroxyethyldellum vinegar with the following components, wt.%,

Cement10,4-11,4

Acetone-formaldehyde resin 0,012-0,018

Caustic 1sht0.0012-0.0019

Large aggregate 55,5-56,4 Fine, filler 27,1-27,5

1% aqueous solution of oxystildehyde 0.4-0.78

WaterEverything

The introduction of hydroxyethyl cellulose into the concrete mix allows for a greater safeguarding effect of the additive, since hydroxyethyl cellulose is a high molecular weight product that reduces the surface tension of the liquid.

In addition, with pronounced plastidating properties, oxyethyl cellulose acts as a retarder for the curing of acetone formaldehyde resin. This prolongs the plasticizing effect of the additive in concrete, which is important before compaction at the place of installation. Hydroxyethylcellulose is a water-soluble cellulose ether and is characterized by the following indicators:

Solubility in water,% 99.8

Viscosity of a 1% aqueous solution, cP68.0 Ash content,% 0.03 AD-formaldehyde resin ACP-3M is a condensate product with formaldehyde. Soluble in water in any ratios and has the following characteristics:

Cement grade 300

10.4

Acetone formaldehyde

0.012 resin,

Caustic soda (35%

0,0012 solution)

Large aggregate 57 .1 gravel

Fine aggregate 27, 1 sand

Density at 20 ° C

g / cm

Y2

Viscosity (VZ-4

at 20 ° C), with 28.0

Content free

formaldehyde,% 1.8 20.06

The content of hydroxyl pears,%

Content of the main

85.9

product% 7.0

pH

The preparation of the concrete mixture was carried out in the following sequence. The solution of hydroxyethyl cellulose is preliminarily prepared and the calculated amount of ad-formaldehyde resin is introduced into it and mixed until homogeneous.

Immediately before introducing the additive, caustic soda is introduced into the concrete mixture in the form of a 35% aqueous solution. The additive is added with mixing water, diluted to the required volume and ratio of the components.

The concrete mixture offered is illustrated by examples of compositions given in

tab. one.

The test results of the compositions according to the example

are given in table. 2

The obtained test results show that the use of the proposed polymer concrete mixture allows to obtain concrete products with a set of technological and physico-technical properties.

The use of the proposed concrete mix is most effective in concrete mixes with coarse aggregate with a flaked grain shape, when uniformity of the products in the volume is achieved.

T a b l and d a 1

11.1

11.5

11.4

0.016

0,018

0.016

0,0016

0,00160,0019

56.13

55.7

56,4, 55,5

27.5

27.6

27.5

1% aqueous solution

0.4 hydroxyethylcellulose

Water

4.9868

0.78

4.98244,80015.2

5.2524

Claims (1)

Claim Concrete mixture including cement, acetone-formaldehyde resin, caustic soda, coarse and fine aggregates, water, characterized in that, in order to improve the workability of the mixture, increase the strength and density of concrete, it additionally contains a 1% aqueous solution of hydroxyethyl cellulose in the following ratio of components, wt.% / Cement10.4-11.4 Acetone-formaldehyde resin 0.012-0.018 i