RU2008205C1 - Method for making plate-type products such as tiles by half-dry pressing - Google Patents

Abstract

FIELD: production of articles from concrete mixtures. SUBSTANCE: method comprises steps of preparing and compacting concrete mixture by two stages; between the stages of preliminary and final preparation of the concrete mixture performing an activation of its components with simultaneous separation of fine filler particles, having size more, than 4-5 mm, due to action of oscillation pulses with frequency 2-6 Hz and amplitude 15-25 mm; upon the stage of preliminary preparation of the concrete mixture mixing over 1.5-3.5 min with motion rate 100-180 m/min and with ratio 1: 2.0- 4.0 a mineral binder and the fine filler in the form of mixture of sands, having fraction module 1.3-2.0 and 2.1-3.2; at the stage of the final preparation of the concrete mixture mixing components in addition over 2.5-4.5 min till providing a humidity value 6-9% ; at first compaction stage applying to the concrete mixture over 0.5-3.0 s oscillation force impulses with frequency 40 -60 Hz and with amplitude 0.5-2.0 mm, being combined at second stage of the compaction process with action of force pulses 5-19 kPa over 3-9 s. EFFECT: enhanced efficiency. 1 cl, 2 tbl

Description

 The invention relates to the production of concrete products in the building materials industry.

 A known method of manufacturing roofing elements, including the preparation of a concrete mixture by mixing a mineral binder, fine aggregate, reinforcing fibers and water, laying the concrete mixture in a formwork with a removable cutter board on a flexible laying element pre-laid on the base, vibration sealing, removing the rigging and holding to hardening [1 ].

 The disadvantages of this method are low productivity and insufficient frost resistance and water resistance.

 The closest in technical essence is a method of manufacturing semi-dry pressing of plate products, mainly tiles, comprising preparing a concrete mixture by mixing a mineral binder, fine aggregate and water, laying it in a matrix, compacting it with pressing and vibrational pulses, followed by extraction from the matrix of the product [ 2].

 The disadvantages of this method is the lack of water resistance and frost resistance, increased consumption of mineral binder.

 The aim of the invention is to increase frost resistance and decrease water permeability while reducing the consumption of mineral binder.

 The goal is achieved in that in the proposed method for the manufacture by semi-dry pressing of plate products, mainly tiles, including the preparation of a concrete mixture by mixing a mineral binder, fine aggregate and water, laying it in a matrix with subsequent compaction in it by the action of pressing and vibrational force pulses and removing the molded element , the preparation and compaction of the concrete mixture is carried out in two stages, while in the interval between the stages of the preliminary and final prepared The components of the concrete mixture are activated with the simultaneous separation of fine aggregate particles with a size exceeding 4-5 mm, the action of vibrational pulses with a frequency of 2-6 Hz and an amplitude of 15-25 mm, and at the stage of preliminary preparation of the concrete mixture for 1.5- 3.5 minutes are mixed with a speed of movement equal to 100-180 m / min, in the ratio 1: 2.0-4.0 mineral binder and fine aggregate in the form of a mixture of sand with fineness modules 1.3-2.0 and 2, 1-3,2, and at the stage of final preparation of the concrete mix, additionally mixing a mixture of components of the concrete mixture is brought in for 2.5-4.5 minutes at a speed of 80-180 m / min while bringing its moisture content to 6-9%, after which at the first stage of compaction to the matrix for 0.5-3 , 0 s, they apply vibrational power pulses with a frequency and amplitude of 40-60 Hz and 0.5-2.0 mm, respectively, which at the second stage of compaction are combined with the action of pressing power pulses of 15-19 kPa for 3-9 on the concrete mix with.

 When implementing the invention creates a technical effect, which consists in increasing the density, strength, water resistance, frost resistance and reducing the consumption of mineral binder.

 A method of manufacturing by semi-dry pressing of plate products, mainly tiles, can be carried out as follows.

 A concrete mixture is prepared in two stages, at the same time, at the preliminary preparation stage, a mineral binder is mixed, for example, 20 kg of M300 cement with 40-80 kg of fine aggregate in the form of a mixture of sand with fineness modules of 1.3-2.0 and 2.1-3 , 2 for 1.5-3.5 min, with a stirring speed equal to 100-180 m / min, and then the resulting mixture of components is subjected to activation before the final preparation step with simultaneous separation of fine aggregate particles whose size exceeds 4-5 mm , exposure to vibrational pulses with amplitude and frequency minutes respectively 15-25 mm and 2-6 Hz.

 Then, at the stage of final mixing, the components of the concrete mixture are additionally mixed for 2.5-4.5 minutes at a speed of 80-180 m / min, while bringing the moisture content of the resulting concrete mixture to 6-9%. The resulting concrete mixture is loaded into a feed hopper, from which the installation matrix is filled with it using a feeder, where at the first stage of compaction, vibrational force pulses with a frequency and amplitude of 40-60 Hz and are applied to the concrete mixture for 0.5-3.0 s and 0.5-2.0 mm, which at the second stage of compaction are combined with the impact on the concrete mixture by pressing force pulses of 5-19 kPa. After completion of the compaction processes, the molded product is removed from the mold and, depending on the need, the product is held until the mineral binder has set or is subjected to heat and moisture treatment.

 From the table. 2 it is seen that the obtained products manufactured by the proposed method, in their physical, mechanical and consumer properties, exceed the requirements of TU 21-0284757-5-91.

 (56) 1. USSR author's certificate N 103259, cl. B 28 3/00, 1955.

 2. USSR author's certificate N 1395592, cl. B 28 B 3/04, 1985.

Claims (1)

 METHOD FOR PRODUCING BY THE METHOD OF SEMI-DRY PRESSING OF LAMINATED PRODUCTS PREFERREDLY TILES, including the preparation of a concrete mixture by mixing a mineral binder, fine aggregate and water, laying it in a matrix with subsequent compaction in it of pressures and vibrating elements, which the mixtures are carried out in two stages, while in the interval between the stages of preliminary and final preparation, the com components of the concrete mixture with the simultaneous separation of fine aggregate particles with a size exceeding 4 - 5 mm, exposure to vibrational pulses with a frequency of 2 - 6 Hz and an amplitude of 15 - 25 mm, and at the stage of preliminary preparation of the concrete mixture for 1.5 - 3.5 min mixed with a speed of movement of 100 - 180 m / min. in a ratio of 1: 2.0 ÷ 4.0 mineral binder and fine aggregate in the form of a mixture of sand with fineness modules 1.3 - 2.0 and 2.1 - 3.2, and at the stage of final preparation they are additionally mixed for 2, 5 - 4, 5 minutes at a speed of 80 - 180 m / min. components of the concrete mixture with bringing its moisture content to 6–9%, after which, at the first stage of compaction, vibrational power pulses with a frequency and amplitude of 40–60 Hz and 0.5, respectively, are applied to the concrete for 0.5–3.0 s. - 2.0 mm, which at the second stage of compaction combine with the effects of pressing power pulses of 5 - 19 kPa for 3 - 9 s.

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