SU878757A1 - Method of making concrete articles - Google Patents

Description

one

The invention relates to methods for the production of building materials, in particular, to the method of impregnating concrete products with solutions of mineral salts.

The known method of impregnation of concrete products with solutions of tetraethyl silicate, HF, 1.

This method is expensive and time consuming (two-stage coating, several containers, etc.).

Of the known methods, the closest to the invention is a method for the manufacture of concrete products, including the molding of products, the heat-moisture treatment and their impregnation with an aqueous solution of a phosphate compound 2.

However, the products obtained after impregnation have insufficient strength and high cost.

The aim of the invention is to increase the strength of the product and reduce its cost.

To achieve this goal, a method is proposed for the manufacture of concrete products, including the molding of products, heat-moisture treatment and their impregnation with an aqueous solution of a phosphate compound containing orthophosphoric acid and pyrite cinders, at 50-60s and the following ratio of components, wt.%:

Pyrite cinder 0,6-1,1

Ortofosforn

acid1.0-1.4

WaterEverything

Impregnation is carried out as follows.

ten

Samples of 40x40x160 mm and 100 mm in size are prepared from a sand-cement mixture of heavy and light concrete. To obtain an aqueous solution of the phosphate compound, 75% phosphate acid is poured into a container of 15 with water, stirred, and then, continuing to mix, pour pyrite cinders in small portions.

The following are specific formulations of an aqueous solution of a phosphate compound, wt%:. .

Composition 1 23

Pyrite

0,60,81,1 cinder

25

Orthophosphorus

1,01,21,4

acid

30 Water

Rest

The composition is heated to 50-60 ° C, the samples are immersed in the resulting solution for 5 minutes and, after drying, they determine the strength under bending and compression.

Example 1. Obtaining products from sand-cement mortar.

Under the same conditions, two series of samples with a size of 40A40x 160 mm are prepared from a cement-sand mortar with a ratio of 3: 1 and a V / C of 0.4. The first series of samples is impregnated with an aqueous solution of the phosphate compound at. The second series is coitrol (without impregnation.

PRI me R 1 .. Obtaining products from expanded clay concrete.

Receive two series of samples from expanded clay concrete following the composition dego:

515 kg / m2 (35.360%)

Cement Keramzi gravel278 kg / m (19.08%) tovot Sand quartz448 kg / m „(30.74%) left 216 kg / m (14.82%) Water

The first series of samples is impregnated with a proposed phosphate compound at 60 ° C. The second - control without impregnation.

PRI me R W Production of heavy concrete.

Receive two series of samples from concrete of the following composition:

Cement 420 kg / m (18.8%)

Sand

quartz-1

400 kg / m (17.9%)

Shcheben

syenite-

1200 kg / m (53.8%);

Water 210 kg / m (9.4%)

The sample impregnation with the proposed phosphate compound was carried out at 55 ° C, and a series of samples of heavy concrete were not impregnated.

Properties made by the proposed method of concrete products in comparison with the control series of samples are shown in the table.

345

53 327

51 49 311

212

34.5

280 306 298 26

230

Thus, during the impregnation of products with an aqueous solution of a phosphate compound, a significant increase (up to 45-55%) in the strength of samples based on sand-cement mortar, light and heavy concrete is observed. When heavy concrete is impregnated with ammonium phosphate (prototype), the strength increases by 10-25%.

The mechanism of hardening by impregnation with an aqueous solution of a phosphate compound is associated not only with the interaction with hydroxyl groups localized on the surface of the crystals of calcium hydrosilicate, but also with spontaneous hardening of the bond in the pores of the material itself.

The use of pyrite Ogarkov reduces the cost of phosphate impregnation in comparison with ammonium phosphate by 21, 5 times, and the cost of products reduces by 20-30% and at the same time there is a utilization of chemical production wastes.

Claims (2)

Invention Formula A method of manufacturing concrete products, including molding products, heat and moisture treatment, and impregnating them with an aqueous solution of a phosphate compound, which is so that, in order to improve the strength of the product and reduce its cost, the product is impregnated with an aqueous solution containing orthophosphorus as the phosphate compound acid and pyrite cinder in the following ratio of components, wt.%: Pyrite 0.6-1.1 Orthophosphoric acid1.0-1.4 p. The rest at 50-60 ° C.J Sources of information taken into account when e spertize 1. Austrian Patent №316402, cl. From 04 to 41/20, published 1974. 2. USSR author's certificate number 411060, cl. From 04 to 41/24, 1972.