RU2078687C1 - Method of manufacturing reinforced concrete - Google Patents

Abstract

FIELD: manufacture of building materials. SUBSTANCE: invention is aimed at eliminating deficiencies of known methods, cheapening process on the whole by tens times, providing versatility of process in manufacturing large variety of items, and using nonconventional materials. Method consists in the following. Dosed amount of binder and fillers are fed uniformly but with different rates into electronic ionic mixer. Particles of charged materials are being oriented in electrostatic field, mix, and sediment into a mold moving under them. The mold has nipples in the bottom and side walls, bottom being similar to vacuum shield. In the second stage, dry components in mold are compressed by aid of synthetic polymer film and vacuum. Through nipples in the bottom, steam is entered without cutting side nipples from vacuum. Steam penetrates surface of object, reduces vacuum pressure under film and in vacuum receiver which indicates necessity to terminate steam wetting process. So object is subjected to heat treatment in the initial phase of hydration resulting in a high effect of thermal activation of hydration reactions. EFFECT: enhanced efficiency of process.

Description

 The invention relates to the production of building materials and products.

 A known method of manufacturing a rigid cement-sand and silicate concrete mixtures in a continuous jet mixer / auth. St. USSR N 265767 class. B 28 C 5/06, 1970 /, including a two-stage movement of the components of the concrete mixture.

 During the mixing process, an electric field of 8-11 kV / cm is created in the mixer body. Before being fed into the mixer, the atomized binder is passed through a corona discharge zone, and the atomized particles of water are passed through a direct current electric field.

 The disadvantage of this method is that water is artificially dosed, in contrast to the process of self-saturation.

 A known method of electroforming volumetric elements / Bout A.I. Founded electronic technology of building materials, M, Stroyizdat, 1973, p. 140-142 /, including the interelectrode space bounded by the corona electrode and the surfaces of four vertically mounted, interconnected belt conveyors, driven by an electric motor, into which metered basic materials are fed uniformly through multichannel nozzles, deposited on the surfaces of moving conveyors and form a layer of the formed volumetric product /prototype/.

 The disadvantage of this method is the artificial dosing of water.

 A known method for the production of iron castings in vacuum sand molds / Guide to iron casting. Ed. prof. N.G. Girshovich, M. Mechanical Engineering, 1978, p. 473 /, including the use of dry sand without a binder, which is pressed and held in the support using synthetic polymer films and vacuum.

 The disadvantage of this method is that without a binder and water, it is not applicable for the manufacture of reinforced concrete products.

 The objective of the invention is to eliminate the disadvantages of the known methods, as well as the cost and versatility of the process, improving the quality of products and working conditions.

 This task is achieved by the fact that the molding is carried out in a vacuum form, equipped with fittings in the walls, and a sieve system in the bottom, and steam saturation is carried out through the bottom and normalized using a polymer film covering the mold with the semi-finished product.

 A method of manufacturing reinforced concrete products is as follows: before being fed into the mold, the sprayed binder and sand are passed through a corona discharge zone, where the cement particles are deposited in a thin layer on the sand particles, thereby moving them uniformly, and then are poured through a slit-like hole into a moving mold with reinforcement filling it evenly. A surface leveled by slight vibration is covered with a synthetic polymer film, the edges of which are fixed with an adhesive paper tape and the form is vacuumized through the fittings. As a result of rarefaction in a dry mixture, it acquires the properties of a durable porous body. Then, steam is supplied through the bottom without disconnecting the fittings from the vacuum receiver, to suck out the gases. Steam moistens the mixture to the top and releases the film, which is a signal for simultaneously turning off the vacuum receiver and supplying steam.

 The proposed method of manufacturing reinforced concrete products allows you to use any binder for any product, reduce the cost of the process, simplify mixing equipment, increase mold service life, improve working conditions: gases are sucked out of the mold and do not enter the workshop’s atmosphere, eliminate noise made by shaking machines, and increase manufacturing accuracy products and ensure high surface cleanliness.

Claims (1)

 A method of manufacturing reinforced concrete products, including laying in the form of dry components previously mixed in an electrostatic field, compressing with a synthetic polymer film and vacuum and steam saturation, characterized in that the heat treatment and steam saturation are carried out simultaneously in a vacuum form, coated on top of the polymer film, using which and vacuum pressure normalize steam saturation.