SU1203066A1 - Method of preparing porous expanded clay aggregate and concrete mix - Google Patents

Description

The invention relates to the construction industry and can be used in the manufacture of products made of porous claydite-concrete,

The purpose of the invention is to reduce the density of claydite-concrete without reducing its strength.

The invention is implemented as follows.

In the creeping and fine aggregate, they are mixed in a concrete mixer for 1-1.5 minutes with an aqueous solution of a pore-forming substance having a temperature of 20 ° C and containing 70-80% of the total volume of the mixing water. The mixture of these components causes the adsorption interaction of the entire amount of the pore-forming substance with the host, resulting in a stable porous solution with high plastic properties. The prepared porous mortar component of the mixture is added to expanded clay gravel with a temperature of 120-150 ° C, which absorbs from the solution, mainly water, a pore-forming agent, plasticizes the mixture and continues to react with it, which increases the strength of the cement stone. Then, hot claydite gravel with a cold porous solution containing 70–80% of the total volume of mixing water is displaced within 1–2 min. Into the mixture, 5-7% of mixing water are introduced in the form of steam and the mixture is heated, adding the remaining 25-13% of water, and the mixture is stirred for 1 - 0.5 min. At the same time, the air and the vapor-air mixture in the pores of expanded clay expand, displacing part of the water from the pores of the expanded clay into the mortar component of the mixture, resulting in the plasticization of the expanded clay concrete mixture.

Example. Cement, quartz sand and an aqueous solution of sulfonol in

030662

the amount of 220 liters (or 75% of the total water consumption per batch of 320 liters) is mixed for 1.5 minutes. Into the resulting (cold) mass, pour goat rye clay (t 150 C) and mix again for 1.5 minutes. Then, 18 kg of steam is supplied to the working mixer, which is 6% of the total consumption by the mass of condensate.

10 mixing waters. After the steam has been disconnected, the remaining (required by kneading) water in an amount of 62 liters (or 19% of the total consumption) is added and the mixture is finally stirred for 0.5 minutes. 15 The resulting porous claydite-concrete mixture has a temperature of 78 ° C and a draft of a cone of 3 cm.

Molded cubic samples after steaming for 10 hours at 85–5 ° C and

The 20 subsequent curing in the normal storage chamber is dried to constant weight for 28 days. After this, the samples are weighed, measured (their density is determined1) and tested for

25 compressive strength on the press

PSU-50. According to the test results

three twin samples are obtained; Density: density (body weight) 1120 kg / m, compressive strength

30 9.6 Sha.

To compare the results (density and strength of hardened carbonaceous concrete), control samples are made in parallel of porous claydite-concrete mixture by a known method, one series of samples being made using conventional (cold) claydite 5 and the other on hot ceramics. (150 ° C). The consumption of cement and aggregates is assumed to be the same for all the compositions, and the amount of mixing water (pure and in the form of an aqueous solution of sulfonol) is taken from the condition of obtaining an equipodable mixture. All three series of samples are molded and subjected to heat treatment in the same mode.

The results of testing porous iQ of claydite-concrete foot are presented in the table.

Claims (1)

METHOD FOR PREPARING LORIZED ^ ERAMZEBETON CONCRETE MIXTURE, including mixing a binder, fine aggregate, expanded clay gravel and an aqueous solution of a pore-forming substance, characterized in that, in order to reduce the density of expanded clay concrete without decreasing its strength, pre-mix the binder and small-sized filler with a fine aggregate containing 70-80% of the total volume of mixing water, then expanded clay gravel with a temperature of 1 ΣΟΙ 50 C is added, the mixture is mixed for 1-2 minutes, g after which 5-7% water is introduced into it atvoreniya as steam, is added the remaining amount of water and finally the mixture was stirred.