SUBSTANCE: stowing composition comprising portland cement, plastifying agent, fine-grained filler - sand and water, additionally comprises as a binder the milled tailings of wet magnetic separation of ferrous quartzites with an average particle size of 2.071 microns, as a plastifying agent - superplasticiser SP-1, and the sand with an average particle size of 62.26 microns with the following ratio of components, wt %; the said cement - 13.48; the said sand - 56.43; the said wastes - 2.70; superplasticiser SP-1 - 0.138; water - the rest.
EFFECT: decrease in cement consumption, and increase in the strength of the stowing composition, use of sand with a lower fineness modulus.
1 ex, 2 tbl
The invention relates to the mining industry and can be used in the development of mineral deposits with the mined-out space.
Known filling composition comprising cement, fine aggregate and water in the following ratio, wt.%: cement - 15,54; fine aggregate (tailings disseminated ores of the Norilsk concentrator) - 61,49; water - the rest [Montanov A.N. The formation of the filling mass in the development of diamond deposits in permafrost. - M.: Publishing house "Mountain book", 2005 - 597 S. - S].
The disadvantages of this mixture are low strength (2,3 MPa at 28 days of age) with a large amount of cement.
Known filling composition comprising cement, fine aggregate and water in the following ratio, wt.%: cement - 15; fine aggregate (tails concentrators) - 50; water - the rest [Montanov A.N. The formation of the filling mass in the development of diamond deposits in permafrost. - M.: Publishing house "Mountain book", 2005 - 597 S.-S.]
The disadvantages of this mixture are also low strength (1,2; 1,3; 1,5; 2,5 MPa at the age of 28 days when using the tails of Zhezkazgan, Belousov, Zyryan and Mirgalimsai factories respectively) with increased consumption of cement.
The closest before agemono invention is a filling composition, contains Portland cement M400, plasticizing additive (lsls), fine aggregate (fine sand, fractional composition shown in table 1) and water in the following ratio of components, wt.%: cement - 14,79; LST - 0,170; aggregate - 62,47; water - the rest [Montanov A.N. The formation of the filling mass in the development of diamond deposits in permafrost. - M.: Publishing house "Mountain book", 2005 - 597 S. - S].
The disadvantage of this composition is low in a sufficiently large amount of cement strength (concrete grade M30, this mark corresponds to the strength of 3 MPa).
The task of the invention is to reduce the consumption of cement and increase the strength of the backfill composition, the use of sand with a lower fineness modulus.
Full balance on sieve No. 063 from 10 to 30% sand refers to small, less than 10% is very small. The fineness modulus of fine sand 1.5-2 mm, very small 1-1 .5 mm [GOST 8736-93. Sand for construction works. Technical specifications].
To achieve the objectives of the proposed backfill composition comprising Portland cement, plasticizing additive, fine aggregate - sand and water, and as the binder further comprises a ground tailings wet magnetic separation of iron ore with an average particle size of 2,071 μm, as the e plasticizing agents - superplasticizer SP-1, and sand with an average particle size of 62,26 μm, in the following ratio of components, wt.%: the specified cement - 13,48; specified sand - 56,43; specified waste - 2,70; superplasticizer SP-1 was 0.138; water - the rest.
The technical result - reduction of Portland cement, increasing the strength of the array, use sand with a lower fineness modulus.
According to the official site: http://www.ktprom.ru/plast.htm, http://www.polyplast-un.ru/products/2810/17274 - superplasticizer SP-1 is a synthetic organic substance on the basis of a product of condensation of naphthalenesulfonate and formaldehyde with a specific ratio of fractions of different average molecular weight, polynaphthalenesulfonate or methylenbis (naphthalenesulfonate) of sodium. Classification GOST 24211 refers to plastifitsirujushchej-water-reducing mind - superplasticizers. Chemical composition: methylenbis (naphthalenesulfonate) sodium or polynaphthalenesulfonate. Superplasticizer SP-1 produced according to TU 5870-005-58042865-05 and designed (use):
- to increase the workability and formemost concrete mixes without compromising strength and performance durability of concrete (at constant water-cement ratio);
for a substantial improvement of physico-mechanical characteristics and building technical the properties of concrete by reducing water consumption and constant workability);
- to improve the workability of concrete mixtures and improve the physico-mechanical and structural properties of concrete (while reducing the water / cement ratio and increasing the workability);
- to reduce cement consumption without reducing the workability of concrete mixture, physico-mechanical and structural properties of concrete by reducing the water content in concrete mix).
Tailings wet magnetic separation of ferruginous quartzite, crushed in a laboratory planetary mill Pulverisette 5 to an average particle size of 2,071 microns, mixed with cement PC, with sand with an average particle size of 62,26 μm and closed the water in which the previously added superplasticizer SP-1. The final mixture was mixed to a uniform consistency. The resulting mixture is prepared samples of size 70×70×70 mm, the Samples were kept in a climatic chamber for 2-3 days before reaching the Stripping strength of the samples. In the chamber was maintained temperature 20±20°C and relative humidity of 90-95%. After demoulding, the specimens were again placed in the climatic chamber for further hardening, after which he determined the mechanical strength using a test machine Instron 5882.
The following results are obtained: mechanical the Kai strength - 3,5 MPa (M35 grade of concrete) at the age of 28 days, 6,44 MPa at the age of 180 days at a flow rate of cement 13,38%. The diameter of the spot spreading on Attardo - 16,5 see
In the prototype when the cement content 14,79% grade of concrete - M30.
|Fractional composition of fine-grained sand|
emnd composition, %
In the tables the 2 is the source of the gross composition of the mixtures and the results of testing the mechanical strength of the samples, prepared from these mixtures.
|No.||The flow of components (wt.%) in the manufacture of filling mixtures||Grade of concrete backfill composition|
|Portland cement||The sand||Tailings wet magnetic separation||SP-1||LST||Water|
From table 2 it follows that the task of increasing the mechanical strength of filling the composition of the prototype (concrete grade M30) by reducing the cement and sand with a smaller module coarsely the tee is achieved by adding crushed tailings wet magnetic separation of iron ore with an average particle size of 2,071 μm and used as plasticizing agents superplasticizer SP-1.
Backfill composition comprising Portland cement, plasticizing additive, fine aggregate - sand and water, characterized in that as the binder further comprises a ground tailings wet magnetic separation of iron ore with an average particle size of 2,071 μm, as plasticizing agents - superplasticizer SP-1, and sand with an average particle size of 62,26 μm in the following ratio, wt.%:
|The specified cement||13,48|
|The specified sand||56,43|
|Superplasticizer SP-1||was 0.138|
SUBSTANCE: invention relates to mining industry and may be used in development of thick edge ore bodies with unstable ores, for instance, kimberlite pipes, by the underground method. The method includes division of a deposit into panels and layers with their extraction in stopes in descending order and subsequent filling with hardening mixtures, parameters of layer stoping are increased along height and width to chamber dimensions, and along the length they are divided into sections, besides, chamber stopes and sections in the vertical-longitudinal section are given the shape of the isosceles trapezoid. Then their mining is carried out in stages so that during mining of each subsequent section the level of the haulage horizon is reduced by the height of the sectional haulage mine, for this purpose, initially, in the chamber-stop roof for all of its sections they arrange a common drilling-filling mine, and the sectional haulage mine, for each subsequent section, is mined under the filling massif of the earlier mined section, besides, after complete mining of the previous section its haulage mine in the reverse order is expanded to the width of the previously filled section, at the same time the direction of mining of chambers-stopes on each subsequent underlying layer is changed for the opposite one.
EFFECT: increased intensity of deposit mining in case of unstable ores, due to provision of stability of ore walls of stope entries during the whole period of performance of stoping works and exclusion of breaks in a filling massif, and also improved conditions for ventilation of mines.
2 cl, 1 dwg
SUBSTANCE: invention relates to mining industry and may be used in development of thick steeply-dipping valuable ore bodies by the open-underground method. The method includes development of a pit to design depth with arrangement of the board to the limit position, mining of bottom and near-edge-zone reserves of ore with application of underground mines, transportation of broken ore in underground mines. Development of near-edge-zone reserves of the ore is carried out after extraction of bottom ones with a chamber system of development under protection of a combined rock-filling massif at the side of the pit space, besides, the rock-filling massif is formed as bottom up in layers, alternating filling of the waste rock and filling of the hardening filling mixture of the formed space between the dump and the board of the pit on each layer.
EFFECT: reduced losses and dilution in mining of near-edge-zone reserves of ore from overlying rocks.
3 cl, 1 dwg
SUBSTANCE: invention relates to mining industry and may be used in development of mineral fields with filling of the mined space. The composition of the filling mass includes portland cement, a filler and water, besides, it additionally comprises a surfactant of a superplasticiser SP-1, and the filler is represented by stale wastes of dressing of wet magnetic separation of ferruginous quartzites and converter sludge at the following ratio of components, wt %: portland cement - 8.0; specified sludge - 12.70; specified wastes - 56.64; superplasticiser SP-1 - 0.08; water - balance.
EFFECT: exclusion of natural fillers, increased mobility of filling mass and increased volumes of recycled anthropogenic wastes for considerable improvement of environment in the region.
SUBSTANCE: invention relates to mining industry, namely, to undermining of ore bodies with filling of the mined space with hardening mixes. The method to determine extent of undermining of hardening fill under mechanical damage of ore massif includes formation of a hole in the ore massif and fixation of a stiff rod in it for fixed depth, supply of hardening filling mix into the mined space, damage of the ore massif with a part of the contact layer of the hardening fill massif. When mining the ore massif, they damage the rod in the ore massif and in the contact layer of the hardening fill massif, and the extent of undermining of hardening fill is determined according to the difference in the following formula: Δ=L-L1-L2, where Δ - extent of undermining of the hardening fill massif; L - total length of blind cavity, arranged inside the rod; L1 - length of rod deepening in the hole of the ore massif; L2 - length of blind cavity that is left after damage of the ore massif.
EFFECT: invention makes it possible to determine extent of undermining of hardening fill massif.
SUBSTANCE: invention proposes a preparation method of a porous hardening mixture for stowing of the mined-out underground space, which involves joint crushing and grinding of a mineral filler and a binding agent in a cone-type inertia crusher, mechanical activation of the obtained mixture, addition of water to the mixture and its supply to the stowed space. Besides, mechanical activation of the mixture is performed till water is added to it at the value of crushing force of (4÷8)·105 N. And before the mixture is supplied to the stowed space, foam is added to the stowing mixture.
EFFECT: reduction of a binding agent consumption at sufficient strength of a stowing mixture.
SUBSTANCE: method includes tunnelling of a complex of stripping, preparatory and cutting underground mines, ore breaking and delivery, mine pressure maintenance, transportation, lifting of ore to a horizon of a ore-collecting hopper. Stopes are mined with the help of chamber systems with subsequent filling of the mined space. Tunnelling of a row of mines and process chambers is carried out outside the ore massif in foot wall rocks. Two separate mobile grinding modules are installed in process chambers, which are connected to each other by systems of transportation of a solid stowing mix components, including broken rock. The first module of coarse grinding is placed in preparatory or cut mines, and the second one - fine grinding directly above the filled space and combined with a module for mixing of the solid stowing mix, at the same time unloading from the module of fine grinding is carried out via a receiving tray and a well into the filled space. Grinding of rocks in the fine grinding module is provided to the content of - 0.074 class not below 32%.
EFFECT: invention makes it possible to improve efficiency of mining.
2 cl, 1 dwg
SUBSTANCE: composition of a mixture for filling of mined space includes wastes of enrichment processes, lime, sodium lignosulfonate and water. The specified wastes are current tails of floatation dressing of polymetal ores with moisture of less than 30% at the following content of components, kg/m3: current tails of floatation enrichment of polymetal ores with moisture of less than 30% 1800 - 2010, lime 80 - 120, sodium lignosulfonate 1.2 - 1.5 and water - balance to 1 m3. The method to manufacture the composition of the mixture for filling of the mined space includes drying of current tails of floatation enrichment of polymetal ores to moisture content of less than 30%. Sodium lignosulfonate is previously dissolved in water, and then mixed with dried tails and lime.
EFFECT: simplified and cheaper filling mixture with preserved operating properties.
3 cl, 1 tbl
SUBSTANCE: tubing block is exposed over height in two levels. Top level is vent-and-waste floor to release all air from tubing block and to feed stowing mix in breakage heading. Bottom level is haulage level and serves to feed fresh air for mining operations and haulage of all rocks from tubing block to shafts. Spiral descent is made for entire height of tubing block with entries to layer drifts, ore and delivery entries. Divided layer is developed by cul-de-suc miner with pillar width equal to that of cut. Attachment and formation of stowing bulk are made. Breakage cutting is performed by miner transversely to direction of strata and pillars are installed. Heading is vented by local blowers.
EFFECT: higher efficiency and safety.
6 cl, 4 dwg
SUBSTANCE: method includes digging of workings for dividing of ore body in blocks, stage extraction of ore by chambers. After dividing of ore body into panels, blocks and chambers, development of chambers is done in staggered order as to ore body rise by the scheme I-III-II-IV as shown in dwg. 1-5. At that bottoms of adjacent chambers I (II) and III (IV) are displaced by one sub-level. Broken ore is transported from the chamber to bottom gangway along delivery crosscut drifted in the middle part of adjacent chamber which is used as drilling crosscut during its development. Development of ore of upper part of chambers is performed between artificial pillars from consolidating stowing mass, and of lower chamber - in ore rock. Coefficient of form Kf=bu/hp size of ore pillar corresponds to the following condition: 0.5<bu/hp<1, where: bu - width of ore pillar and width of undeveloped chamber, m; hp - height of ore pillar or half height of undeveloped chamber, m.
EFFECT: invention allows reducing overburden pressure on the elements of development system, reducing losses and ore impoverishment.
3 cl, 6 dwg
SUBSTANCE: all pillar erection operations are performed during winter period after the development of cleaning chamber in alluvial well is completed. A vertical well of large diameter (500-600 mm) is pre-drilled from surface above the developed chamber, under which an underground construction of a moving frame is performed; the above frame is filled with crushed rock mixture formed during summer sand flushing at flushing plants and contained in dumps. Then, mixture is compacted by means of vibration machines and warmed up for a short period of time with its being moistened with superheated steam supplied at high pressure from steam-generating plant in quantity of at least 10 m3 per 1 m of the mixture. After that, frozen rock mixture - pedestal-shaped pillar is frozen in addition with cold air induced with a fan, thus providing high compression properties.
EFFECT: invention allows reducing useful mineral losses and water consumption, increasing pillar erection speed and preventing the deformation of ground surface above developed mine field.
SUBSTANCE: granulated composite filler for concrete products of size 0.5-10.0 mm, consisting of core and shell, wherein the core is obtained by granulating the mixture together with diatomite and sodium hydroxide milled up to the specific surface area of 150-250 m2/kg at their weight ratio of 0.70-0.95:0.05-0.30 with bond by aqueous solution of sodium silicate with density of 1.2-1.3 g/cm3 in the amount of 0.1-7.0 wt % of mixture, and shell is formed on the surface of core by its balling with dry dust mixture together with milled quicklime and silicofluoride sodium in a weight ratio of 0.85-0.95:0.05-0.15 with the subsequent hardening up to the strength not less than 0.12 MPa, after the indicated balling the additional spraying of 40% aqueous solution of oxalic aldehyde in the amount of 1.0-8.0 wt % (per 100% substance) of weight of shell components is carried out. Concrete building product is obtained by using the granulated filler indicated above.
EFFECT: decrease of thermal conductivity and water resistance of concrete products when increasing and maintaining the strength characteristics.
2 cl, 1 tbl, 1 ex
SUBSTANCE: fine-grained cement concrete is composed of cement, sand, water, plasticizing agent and basalt fibre, introduced into the mixture by the hydraulic opening method, at the following ratio of components, wt %: cement - 34, sand - 64, water - 1.4, plasticizing agent - 0.3, basalt fibre - 0.3.
EFFECT: increase of fracture toughness, strength, resistance of micro-reinforcing component to the influence of aggressive alkaline environment of the cement stone.
SUBSTANCE: subject of the present invention is a dry binder premix which contains the following, wt %: portland clinker having a Blaine specific surface area of 4500 to 9500 cm2/g, preferably 5500 to 8000 cm2/g, the minimum quantity of the clinker by mass percentage relative to the total mass of the premix being determined according to formula (I): [-6.10-3×SSBk]+75, in which SSBk is the Blaine specific surface area given in cm2/g; fly ash; at least one alkali metal sulphate, the quantity of alkali metal sulphate being such that the quantity of equivalent Na2O in the premix is greater than or equal to 5 wt% relative to the mass of fly ash; at least one source of SO3, in a quantity such that the quantity of SO3 in the premix is greater than or equal to 2 wt % by relative to the mass of portland clinker; complementary materials having a Dv90 less than or equal to 200 mcm selected from limestone powders, the quantity of clinker+the quantity of fly ash being greater than or equal to 75 wt %, preferably 78 wt %, relative to the total mass of the premix; the total quantity of clinker in the premix being strictly less than 60 wt % relative to the total mass of the premix. The subject of the invention is also a dry binder mix obtained by mixing said premix with aggregates, as well as a concrete grout composition obtained by mixing with water.
EFFECT: obtaining concrete with low carbon dioxide emission.
13 cl, 1 dwg, 3 tbl
SUBSTANCE: raw mixture for production of coarse aggregate shell contains, wt %: Portland cement 30.0-35.0; casein glue 4.0-7.0; fly ash 28.0-31.0; water 30.0-35.0.
EFFECT: increase of bonding strength of shell with the surface of the coarse aggregate.
SUBSTANCE: raw mixture for production of artificial rock includes, wt %: Portland cement 26-30, silica sand 48.44-56.9, water 16-20, fibrous metal-ceramics 1.0-1.5, phenyletoxisiloxane 0.06-0.1.
EFFECT: increase of strength.
SUBSTANCE: concrete mixture comprises, wt %: Portland cement 25.0-27.0; characterized by particle-size composition, wt %: particles larger than 0.63 mm, but smaller than 1 mm - 0.2; larger than 0.315 mm, but smaller than 0.63 mm - 4.8; larger than 0.14 mm, but smaller than 0.315 mm - 62; smaller than 0.14 mm - 33 ash and slag filler 15.0-19.0; slag pumice with density of 0.4-1.6 g/cm3 crushed and sieved through mesh No. 10 - 30.3-34.3; aluminium powder 0.1-0.2; superplasticizing admixture C-3 - 0.5-0.6; water - 23.0-25.0.
EFFECT: increase of concrete strength.
SUBSTANCE: crude mixture for producing material which imitates natural stone, which includes ground mica and liquid glass, further contains water, white portland cement, quartz sand, green phthalocyanine pigment or light-blue phthalocyanine pigment, with the following ratio of components, wt %: ground mica which is sieved through sieve N5 35.0-40.0, liquid glass 3.0-5.0, water 16.0-18.0, white portland cement 27.0-31.0, quartz sand 10.7-13.9, green phthalocyanine pigment or light-blue phthalocyanine pigment 0.1-0.3.
EFFECT: high water-resistance.
SUBSTANCE: invention relates to construction materials and specifically to multicomponent dry construction mixtures, and can be used in making a thin reinforced cladding for large concrete blocks in large concrete block building construction, including for repairing the surface of large concrete blocks, floor slabs, supporting frames etc. The dry construction mixture includes mineral binder, natural quartz sand and crushed limestone screenings, a complex additive UP-4 and waste polypropylene fibres, with the following ratio of components, wt %: portland cement - 19.65-18.7, natural quartz sand Mk-1.82 - 43.0-37.0, crushed limestone screenings with particle size of 0-5 mm - 37.0-44.0, complex additive UP-4 - 0.15-0.1, waste polypropylene fibres - 0.2.
EFFECT: low consumption of portland cement, improved adhesion properties and workability, high compression and tensile strength, preventing corrosion of fibres during use of the article.
SUBSTANCE: invention relates to the field of construction, in particular, to compositions and methods to produce lighter masonry mortars designed to arrange enclosures from effective small elements. The method includes mixing of portland cement with water and superplasticiser S-3 in a mortar mixer, subsequent introduction of hollow glass microspheres into the produced mix, mixing of all components of the mortar and subsequent extrusion of the produced composition at the following ratio of components, wt %: portland cement - 37.5…67.2, hollow glass microspheres - 6.7…18.7, modifying additive - 0.28…0.50, water - 25.5…43.5. A raw composition for production of a lighter masonry mortar is produced by the above method.
EFFECT: reduced average density and increased strength of a lighter masonry mortar.
2 cl, 5 tbl
SUBSTANCE: invention relates to production of construction materials and can be used for the production of wall blocks with strength class from B2.5 to B7.5. A composite construction material includes Portland cement M400 as a binding agent, crushed waste moulding mixture (WMM) with an optimally selected fraction composition (2.5 mm fraction - 77%, 1.25-0.63 mm fraction - 5%, 0.315-0.14 mm fraction - 18%) as a filling agent, water, a superplastisiser C-3 as a plastisising additive, microsilica as a highly active mineral additive, with the following ratio, wt %: Portland cement M400 13.5-22.7; crushed WMM 66.6-81.0; water 5.4-13.3; superplastisiser C-3, % of cement weight, 0.3; microsilica, % of cement weight, 10.
EFFECT: technical result consists in the increased strength and frost resistance, reduction of water absorption.
SUBSTANCE: claimed invention relates to a concrete-expanding additive and to a method of obtaining thereof. Concrete with the said additive possesses higher stability in storage. The concrete-expanding additive is obtained by thermal treatment of a clinker or a powder-like clinker, which contains in wt.p. per 100 parts of the clinker free lime in an amount of 10-70, a hydraulic substance 10-50 and water-free calcium sulphate 1-50, in an atmosphere of gaseous carbon dioxide to form in it calcium carbonate. In the method of obtaining an expanding additive clinker, containing free lime, the hydraulic substance and water-free calcium sulphate are subjected to thermal processing to form in it calcium carbonate. The invention is developed in dependent items of the invention formula.
EFFECT: provision of considerable concrete expansion in the period from 2 to 7 days after laying, which makes it possible to develop high early compression strength.
9 cl, 7 tbl