SU1020407A1 - Method for making silica concrete construction products - Google Patents

Description

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The invention relates to building materials and can be used in the technology of well-prepared concrete products for the needs of mass construction. There are known methods for manufacturing products from dense silicate concretes, including grinding limestone sanding into sanding, grinding, sanding with natural sand, wetting the mixture, forming by vibro-compaction, and autoclaving. The disadvantage of these methods is the use of expensive autoclave processing. Closest to the proposed method of manufacturing building silicate concrete products, including preparation and compaction of the mixture in the form and a two-stage heat treatment: first steaming at 90-100 ° C for A-6 h, and then drying with superheated steam at 180220 0 V. 4- 8 hours 2. The disadvantage of the known method is the low strength of the products, since compaction by compression cannot provide high homogeneity of the concrete structure of the formable products of rigid mixtures and their strength. The purpose of the invention is to increase the prod uct of products. This goal is achieved by the fact that according to the method of manufacturing building silicate concrete products, including the preparation and compaction of a mixture in the form and a two-stage heat treatment of the products; first steaming at 90-100 ° C for -6 h, and then drying with superheated steam at 180-220 ° C for h., the mixture is compacted by the action of vertically directed vibrations under a vibration load with horizontally directed vibrations. The method is carried out as follows. The quicklime, natural perlite and fine quartz sand is ground in a vibrating mill, the resultant is mixed with natural sand and mixed with water and soda dissolved in it. Products are molded on a vibroplatform with vertically directed vibrations under the load with horizontally directed vibrations. Parameters of vertically directional vibrating vibrating plate: Oscillation frequency, count, / min 2800 Amplitude, mm 0, i-0,6 Vibrating cargo parameters: Oscillation frequency, col./min 4000 Amplitude, mm 0.2-0.3 Concrete mix for 15 s compacted without prigruz, and then under the weights for 30-45 s, after which the product is subjected to heat treatment in the first stage for 4-6 hours with saturated steam at 90100 ° C, and then in the second stage with superheated steam at 180-229 within 4-8 hours. The proposed vibration compaction of products differs from the well-known in that here, in addition to the stationary vibrating plate, which boosts vertical vibration, a portable vibration load with removable nozzles is used, in which horizontally directed vibrations are excited. When such a vibrator is operating, the diluting mass of the vertical vibrating action is accompanied by the rubbing action of the horizontal vibrations. When forming articles from hard mixes with molding moisture of 7-8, horizontal-vertical vibrating produces dense structures. Example 1. The lime with the activity of CaO 80 is ground in a laboratory vibrating mill together with natural sand and natural perlite. The activity is cao 16–39, the fineness of grinding is 5000 grams. The resultant is mixed with fine sand with a particle size of 1.5, and the mixture is mixed with water with (dissolved) soda contained in it. Samples are shaped with 10-cm rib, using a vibration seal with bidirectional vertical-horizontal vibration and subjected to heat treatment according to the following conditions: steaming with saturated steam at 95 ° C for 4 hours; drying with superheated steam at 200 ° C The finished cubes after cooling are tested for compressive strength. The test results are shown in table 1.

Example 2, Lime of 93.5% of active lime, natural perlite and fine quartz sand is ground in a mill at a ratio of 1: 1, 5: 1.5. The resulting substance is mixed with natural sand in a 1: 2 ratio. The mixture is shuttered with water with soda dissolved in it (15% by weight of dry components J. Molded sample cubes using both conventional loaded vibrations and vertical vibrations

02Qk074

by vibrations (in vibroplanter) and horizontal (in weights) vibrations. Hardening of all samples was carried out according to the mode: steaming at 8 h, 5 drying with superheated steam at 6 h, natural cooling.

The test results are shown in table 2.

As can be seen from the results of the test 10 research institutes, the proposed method provides for obtaining products with increased strength.

Table 1

5002100

4502060

 2100 6i 02064

The proposed method

5.2 U + O 5.2 8.0 550

7,8

Known method

kSQ i4i "3 DO

575 575 533 619

, Table 2

Claims (1)

METHOD FOR MANUFACTURING CONSTRUCTION-. BODY SILICON-CONCRETE PRODUCTS, including preparation and compaction of a mixture in the mold and two-stage heat treatment of products: first steaming at 90-100 ° C for 4-6 hours, then drying with superheated steam at l80-220 ° C for 4-8 hours, o The reason is that in order to increase the strength of products, compaction is performed by the action of vertically directed vibrations under vibroload with horizontally directed vibrations. >