RU2806398C2 - Repair mixture - Google Patents

Abstract

FIELD: repairs.

SUBSTANCE: invention is related to construction, restoration, repair and recovery of historical and cultural monuments, made using a repair mixture based on hydraulic lime.

EFFECT: increasing the strength and rheological characteristics of the repair mixture. The repair mixture contains components in the following ratio, g: shale chips 165, dolomite sand 280, hydraulic lime 60, cement 35, wood ash 7, low-fat cottage cheese 4, water 7.

1 cl, 2 tbl

Description

The invention relates to the construction, restoration, repair and restoration of historical and cultural monuments, made using a repair mixture based on hydraulic lime.

A dry construction mixture is known, including Portland cement with slag CEM II/A-III 32.5B, sand with a fineness modulus of 1.87 and a complex additive consisting of hydrated lime, methylcellulose grade MTs-S, redispersible powder REPOL S-51 and additionally containing mineral filler - dispersed limestone having a bulk density of 1400 kg/m ³ , true density of 2800 kg/m ³ , dispersion of 200 microns, chemical composition (wt.%): 54.16 CaO; 0.45 MgO; 0.55 Fe2O3; 0.22 Al2O3; 0.95 SiO2; 0.27 SO3; loss on ignition 43.08 and mineral (basalt) fibers (TU 5752-002-91341008-2012) from basalt of the Argayash deposit, the chemical composition of which is as follows (wt.%): SiO2 47.5-55.0; TiO2 1.36-2.0; Al2O3 14.0-20.0; Fe2O3+FeO 5.38-13.5; MnO 0.25-0.5; MgO 3.0-8.5; CaO 7-11.0; Na20 2.7-7.5; K2O 2.5-7.5; P2O5 no more than 0.5; S03 no more than 0.5; other breeds no more than 5.

The known method has the following disadvantage: the complexity of preparing the solution due to its multicomponent nature.

There is a known method for producing non-firing mineral binder of hydraulic hardening, including grinding and mixing technogenic heat-treated silicon-aluminium-containing waste in the form of waste heap ash - burnt rock of coal deposits, a lime-containing component in the form of waste from the production of acetylene from calcium carbide, a gypsum-containing component, said ash is pre-dried to moisture content no more than 5% by weight, crushed and mixed with the specified waste in a weight ratio of 3÷5:1 and gypsum-containing waste in the form of fluorogypsum obtained from the sulfuric acid decomposition of fluorite concentrate is introduced in an amount of 8-12% by weight (patent No. 2011132739/03 , 08/03/2011). However, the known method includes components that increase the cost of the finished product.

The closest thing to the claimed invention is a restoration dry mixture containing lime binder, which can be used for making brick or rubble masonry, as well as for leveling walls and ceilings on brick and wooden bases with lime and lime-gypsum plasters. Restoration dry mixture containing lime binder, quartz sand of fraction 0.1-2.5 mm as a filler, dry plasticizer S-3 as a plasticizing additive, potato starch as a water-retaining additive, metakaolin as an active mineral additive, as an air-entraining additive additives blowing agent Ufapore TLA, as a fiber polypropylene fiber 6 mm long with the following ratio of components, wt. %: lime binder 16-20, quartz sand fraction 0.1-2.5 mm 75.55-81.78, dry plasticizer C-3 0.1-0.2, potato starch 0.1-0.2, metakaolin 2-4, blowing agent Ufapore TLA 0.01-0.02, polypropylene fiber 6 mm long 0.01-0.03, where the lime binder is obtained by joint grinding of fluff lime and dolomite flour in a disintegrator in a 1:1 ratio to a particle size of 10-30 microns (invention patent 262733 C1 dated 08/07/2017 .).

The disadvantage of the prototype method is its low activity - 1.1-1.7 MPa.

The technical result of the claimed method is to increase the strength and rheological characteristics of the repair mixture when restoring, repairing and restoring historical and cultural monuments in the event of partial destruction or complete loss.

The technical solution is that the repair mixture contains a binder - hydraulic lime and organic additives in the following ratio of components, g:

shale chips 165 dolomite sand 280 hydraulic lime 60 cemyanka 35 wood ash 7 low fat cottage cheese 4 water 7

The purpose of the invention is to increase the strength of a mortar based on hydraulic lime by adding organic additives to the solution (shown in Table 1). The goal set by the invention is achieved by the fact that in the method of producing mortar based on hydraulic lime, the mortar is prepared in the presence of shale chips, dolomite sand, wood ash, cement, low-fat cottage cheese and water.

At the initial stage, the moisture content and bulk density in the dry state of inert and binding materials were determined.

Shale sand:

- humidity (W) - W = 3.3%;

- bulk density (ρ _s.p ) - ρ _s.p = 1414 kg/m ³ .

Wood ash:

- bulk density (ρ _d.z ) - ρ _d.z = 500 kg/m ³ .

Beam samples measuring 40×40×160 mm were prepared from the mortar, which were tested for bending and compression after 28 days of hardening. The test results are shown in Table 2.

The use of the proposed composition of the repair mixture makes it possible to increase the strength and rheological characteristics of the solution when restoring, repairing and restoring historical and cultural monuments.

Claims (2)

A repair mixture, including a binder and a filler, characterized in that it contains hydraulic lime as a binder, low-fat cottage cheese is used as an organic additive, and the mixture additionally contains shale chips, dolomite sand, cement and wood ash, in the following ratio of components, g: shale chips 165 dolomite sand 280 hydraulic lime 60 cemyanka 35 wood ash 7 low fat cottage cheese 4 water 7