SU1763430A1 - Method of light-weight concrete mixture preparation - Google Patents

Abstract

The invention relates to the building materials industry, in particular to the production of building products and structures from lightweight concrete. The essence of the method lies in the fact that the lightweight aggregate — agloporite crushed stone — is mixed with sludge asbestos-cement waste, then porous sand is fed into the mass and, prior to the introduction of tinder, agitation is carried out on adhered asbestos particles. The density of concrete - kg / m3, strength at the age of 28 days. with compression of 16.4 MPa, with a cut of 0.85 MPa. 1 tab.

Description

The invention relates to the building materials industry, in particular to the production of building products and structures from lightweight concrete.

There is a known method of manufacturing building products by grinding the components into a binder, mixing with the other components and mixing the water mixture.

The disadvantage of this method is the high volume mass of the products obtained.

A known method for preparing a light concrete mixture consists in mixing aggregate granules (polystyrene) with a suspension consisting of a polyvinyl acetate dispersion, portland cement, heat power plant ash, water, and then sand.

The disadvantage of this method is the increased bulk weight and low strength of concrete, the complexity of the composition and

filler preparation technology prior to use in concrete.

The aim of the invention is to reduce the density and increase the strength of concrete.

This goal is achieved by using agloporite crushed stone as a lightweight aggregate in the method of preparing lightweight concrete mixture, which is mixed with sludge asbestos-cement waste, then porous sand is fed into the mass and, before it is added, the asbestos agloportite granules are mixed before removing the asbestos agloporite from the surface .

The method is carried out as follows. A dry aggregate with an open porosity is loaded into the concrete mixer, for example, agloporite crushed stone of fractions 5-10 and 10-20 mm (or fractions 5-20 mm) and sludge asbestos-cement waste. When mixed for 3-5 minutes, the aggregate absorbs the water contained in the sludge, and asbestos-cement particles are carried away by

WITH

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water-filled ,, fill its open pores, clogging them. Then dry porous sand (agloporite, camphorite, crushed expanded clay, etc.) is introduced into the mass and stirred for 2-3 minutes. When mixing, asbestosite is consolidated in the pores of the aggregate and the stripping (cleaning) of the surface of the aggregate grains from adhering particles of asbestos cement with absorption by porous sand introduced into the mixture. The resulting mixture of coarse and fine aggregates is injected into a concrete, e.g. cement, and water is added to obtain a pre-set concrete mix during the molding of products. Then the products are molded and the concrete is cured under natural conditions. PRI me R. A forced agitation mixer was loaded with 220 kg of agloporite fraction 10-20 mm and 220 kg of agglobal fraction 5-10 mm. With stirring, 480 kg of asbestos cement sludge were injected, which in terms of dry weight was 140 kg. After 4 minutes of mixing, after which the asbestos-cement sludge was completely absorbed by agloporite grains (visual observation), 360 kg of agroporitic sand was introduced into the mixer, based on the formulation of the composition of agloporite concrete 150 (compressive strength 15 MPa). The duration of the mixing of the mixture after the introduction of sand was 2 minutes, after which no presence of undisturbed particles of asbestosite was observed in the concrete mix. Visual observations showed that grains of agloporite crushed stone that had an irregular, angular shape with cavernous open porosity did not have particles of previously adhered asbestos cement after the last operation of processing the surface of grains of crushed stone. Then, 270 kg of portland cement 400 was loaded into the concrete mixer and 55 liters of water were added. After 2 minutes of mixing the masses, the resulting concrete mixture was placed in forms and using holoform molding, hollow wall stones were made according to GOST 6133-82 Concrete wall stones. Technical conditions with simultaneous manufacture of sample cubes of 150 x 150 x 150 mm

for quality control of concrete. After 28-day storage in atmospheric conditions (natural hardening), samples were tested for strength properties.

In parallel, control cubes were made with the same concrete formulation (aggregates, cement, water), but the aggregate was first mixed first with asbestos cement slurry, then with the addition of silica sand, followed by drying.

A comparative characteristic of agloporithobeton obtained by the claimed and prototype methods is given in the table.

As follows from the table, the concrete obtained by the proposed method is characterized by lower density and higher strength properties than

according to the prototype.

Claims (1)

Testing of samples of agloporithobeton for shearing by the splitting method showed that the destruction of concrete on the aggregate prepared by the prototype using asbestos-cement sludge occurs through contact with the surface of the grains, and the destruction of concrete on the aggregate treated with asbestos-cement slurry. Invention Formula A method of preparing a lightweight concrete mixture, which includes mixing the lightweight aggregate with the suspension, and then with sand and then introducing it into the mixture and water, characterized in that, in order to reduce the density and increase the strength, agloporite crushed stone is used as a lightweight aggregate, which is mixed with sludge asbestos-cement waste, then porous sand is fed and, prior to its introduction into the shearer, agitation is carried out before adhering asbestos particles are removed from the surface of the agloporite granules. x In addition to water contained in asbestos cement slurry. xx Taking into account the water evaporated during the drying of the filler after sludge treatment quartz sand: (irretrievable loss).