SU1368598A1 - Method of manufacturing multilayer lining of heating sets - Google Patents

Abstract

The invention relates to the manufacture of multi-layer lining of heat units from refractory concrete. In order to increase the service life of the lining, metal anchors are precoated with a layer of l - texxpsocement mortar with a thickness of 0.4-0.7 mm for the length of the anchor being immersed in a protective layer of heat-resistant concrete. In this case, a latex gypsum cement solution is taken of the following composition, wt%: portland cement 16-24; gypsum 1-2; latex 5-7; water 3-6; quartz sand fraction 0-0.315 mm - the rest. The method allows to increase the service life of the multilayer lining of thermal units by preventing the protective layer of heat-resistant concrete from escaping from the building, and also contributes to reliable fastening of the protective layer to the base of the lining for the period of its transportation to the installation site. 1 hp f-ly, 2 tab. with e (L

Description

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The invention relates to the industry of building materials and can be used in the manufacture of multi-layer linings of thermal units, for example prefabricated kiln panels.

The aim of the invention is to increase the service life of the multilayer lining of thermal units.

Metal anchors, coated with a layer of La.texxix cement solution | Dima when transporting the product to the place of its installation. Reliability of fastening is ensured by high mortar strength and adhesion of the coating to the mortar part of heat-resistant concrete and to the anchor.

In operation mode, i.e. when exposed to high temperatures, the I layer of the latex-cement mortar is destructed to form thin cavities between the metal anchor and heat-resistant concrete of the protective-jro layer (the effect of monolithing the anchor disappears), which allows the icer to undergo thermal changes without affecting the concrete, thereby eliminating the possibility of cracks - but the formation of concrete, which increases the service life of the lining.

Example 1. Fragments of a multilayer lining were made according to the proposed and well-known methods. Metal-lined anchors made of heat-resistant steel with a diameter of 8 mm were crushed from the side of the bent part for a length of 50 mm with a lateral mixture of the following composition, wt.%: Portland cement 16, gypsum 2, latex 7, water 6, quartz sand fraction 0-0.315 mm 69.

Then the metal anchors were welded with a step of 200 mm to a steel sheet 5 mm thick, placed thermal insulation layers of mineral wool 50 mm thick and kaolin fiber MKRV-200 50 mm thick and laid (by concreting) for 13685982

shield layer 105 mm thick from heat-resistant concrete of the following composition (kg / m concrete); alumina cement

g M 500-400, chamotte fraction 5-10 mm 650, chamotte fraction 0-5 mm 850, water 240. The obtained fragment of the multilayer lining was placed in the loading window of the furnace for firing ceramics and was subjected to high-temperature processing according to the mode: temperature rise to JJOO C 5.5 h, holding at 4 h, cooling in the furnace.

EXAMPLE 2. A multilayer lining was manufactured in accordance with Example 1, the anchor was covered with a latex-gypsum cement solution with a thickness of 0.55 mm of the following composition, wt.%: Portland cement 20, gypsum L, 5 latex 6, water 4.5 quartz sand 20 fractions 0-0.315 mm 68.

Example The multilayer lining was made according to Example J, the anchor was coated with a latex-gypsum cement mortar with a thickness of 0.7 mm of the following composition, wt.%: Portland cement 24, gypsum 1, latex 5, water 3, quartz sand fraction 0-0.315 mm 67.

EXAMPLE 4. A multilayer lining was made according to the method described in Example 1, the anchor was coated with a latex-gypsum cement solution of the following composition, wt%: Portland-ment 14, gypsum 0.5, latex 4, water 2, quartz sand fractions

35 0-0.315 mm 79.5.

P r and measures 5. Multilayer foot was produced according to the method described in example 1, the anchor was rolled with a latex-gypsum cement solution

40 of the following composition, wt.%: Portland cement 26, guide 2.5, latex 8, water 7, quartz sand fraction 0-0.315 mm 56.5.

In examples 4 and 5, the coating thickness

45 anchors were 0.55 mm

PRI me R b. Multilayer lining was made by the method opi25

50

55

For the bath in Example 1, the metal anchors were installed without a coating with an epsilon cement solution.

After cooling the hearth, a visual inspection of the fragments of the multilayer lining was made, which showed that in example 6 in the protective layer of heat-resistant concrete there were cracks in the cross section of the concrete in the places of attachment of the anchors, and in examples 1-5 there were no cracks.

For the bath in Example 1, the metal anchors were installed without a coating with an epsilon cement solution.

After cooling the hearth, a visual inspection of the fragments of the multilayer lining was made, which showed that in example 6 cracks were formed in the protective layer of heat-resistant concrete over the section of concrete in the attachment points of the anchors, and in examples 1-5 the trein was not observed.

The testing of metal anchors with heat-resistant concrete was carried out according to the following procedure.

Concrete prisms were made with a diameter of 150x150 mm and a length of 240 mm, into which monolithic rods (anchors) with a diameter of 8 yn were inserted into the monoliths and covered in mm, covered with a layer of 0.55 mm latex-gypsum-cement mortar, given in examples 1-5.

To obtain comparative data, metal rods (anchors) without coating were embedded in the same concrete prisms.

The grade of concrete used is 300. The tests were carried out on a 100-ton press by pulling rods out of concrete prisms. The centering of the slips was ensured by resting them on the hinge plate of the press.

During the tests, the moments of complete adhesion at critical loads were determined, i.e. which is complete (e pulling metal rods.

Adhesion stress was calculated by

nz

where P is the tensile force in the reinforcement, kgf;

P - perimeter of reinforcement, cm;

Z - the length of the seal rod in concrete, see

The test results on the adhesion of metal rods of the Speakers) to concrete are given in Table L. :: It follows from Ta6n.J that half-closing metal anchors with a latex-gypsum-cement solution of the proposed composition (examples J-3) contributes to an increase in their adhesion force to concrete due to Strengthening the contact zone of these materials.

The operation of metal anchors in the operating mode (after exposure to temperature) was checked according to the following procedure.

Cubic samples were made of heat-resistant concrete with dimensions of JOOx xlOOxlOO mm, into which metal rods (anchors) with a diameter of 8 mm were embedded in monoliths with outlets of 10 to 15 mm, covered with a layer of latex-gypsum cement mortar of various thickness (Table 2) of the following composition, MJIC.Z: portland cement 20, gypsum 1.5,

latex 6, water 4,5, quartz sand fraction 5-0,315 mm 68.

To obtain comparative data, samples were made in which metal rods (anchors) were used without coating with a latex-cement-cement mortar.

The samples were subjected to high-temperature processing in a silicon silicate furnace.

mode: temperature rise up to 1100 С 6 h, holding at 4 h, cooling in the furnace.

Check the operation of metal

rods (anchors) in concrete after

exposure to high temperatures was the visual inspection of the samples (the presence of cracks), as well as by known methods.

The test results on the adhesion of metal rods (anchors) with concrete after high-temperature processing of the samples are given in Table 2. The test results show

that when metal anchors are coated with a layer of latex-gypsum cement mortar with a thickness of 0.4-0, -7 mm, the cracking of heat-resistant concrete, in which the anchor is sealed, does not occur after exposure to high temperatures; Ratur. When the coating thickness is less than 0.4 mm, as well as without coating, cracks are formed in the cross section of the samples, destroying concrete. When the coating thickness is 0.7 mm, cracks in the concrete do not form

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however, the coatings between the metal anchor and the heat-resistant concrete that occur after the destruction result in a failure to attach the heat-resistant concrete, since the anchor freely comes out of the concrete.

Thus, the use of the proposed method allows to increase the service life of the multilayer lining of thermal units by preventing the protective layer from leaving the heat-resistant baton during operation under high

temperatures, and also contributes to reliable fastening of the protective layer to the base of the lining during its transportation to the installation site.

Claims (2)

1. A method of manufacturing a multi-layer lining of thermal units, including attaching metal anchors to a carrier base, packing thermal insulating layers and saopiTHoro laying of a heat-resistant layer (tile, characterized in that, in order to increase service life (outsurface, metal anchors It is preliminarily coated with a layer of latex-1 ipsocement solution with a thickness of 4-0.7 mm for the length of immersion of the anchor in a protective layer of heat-resistant eton. 6 2. The non.J method, differing in that the latex gypsum cement solution is taken of the following composition, e.%: Portland cement Gypsum Latex Water Quartz sand fractions 0-0.315 mm Table J 16-24 1-2 5-7 3-6 Rest. Used rod (anchor) Uncoated anchor (known) Anchor, coated latex with gypsum-cement solution of composition according to examples 1 2 3 four - five kernel Condition of the samples after firing Anchor, covered with a layer of latex-gypsum cement mortar, thickness, mm 0.4 0.55 0.7 0.2 (lower beyond) 0.9 (upper beyond) Uncoated anchor (known) No cracks Cracks along sample cross section VNIISH Order 270/37 Circulation 560: Random polygons pr-tie, Uzhgorod, st. Project, 4 Pulling force, pulling, kgf 5040 Coupling, MPa 8.36 9.97 10.17 9.82 7.99 8.14 Table 2 Coupling, MPa 4.78 Subscription