CN112408897A - All-light concrete for concrete structure floor and preparation process thereof - Google Patents

All-light concrete for concrete structure floor and preparation process thereof Download PDF

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Publication number
CN112408897A
CN112408897A CN202011342745.8A CN202011342745A CN112408897A CN 112408897 A CN112408897 A CN 112408897A CN 202011342745 A CN202011342745 A CN 202011342745A CN 112408897 A CN112408897 A CN 112408897A
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CN
China
Prior art keywords
concrete
light
portions
concrete structure
structure floor
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CN202011342745.8A
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Chinese (zh)
Inventor
韩浩
张田源
程松
熊惕
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Wuhan Changhua Huixin Building Materials Co ltd
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Wuhan Changhua Huixin Building Materials Co ltd
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Priority to CN202011342745.8A priority Critical patent/CN112408897A/en
Publication of CN112408897A publication Critical patent/CN112408897A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02Agglomerated materials, e.g. artificial aggregates
    • C04B18/027Lightweight materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40Porous or lightweight materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The application relates to the field of concrete building materials, and particularly discloses full-light concrete for a concrete structure floor slab and a preparation process thereof. The all-light concrete for the concrete structure floor slab comprises the following components in parts by weight: 500 portions of cement 400-containing materials, 350 portions of fly ash 250-containing materials, 540 portions of shale ceramsite 460-containing materials, 80-100 portions of ceramic hollow microspheres, 35-45 portions of reinforcing fibers, 8-14 portions of water reducing agents, 6.5-8.5 portions of thickening agents and 400 portions of water 300-containing materials; the preparation method comprises a cementing material premixing procedure, a light aggregate premixing procedure and a concrete mixing procedure. The composition/product of the present application the composition can be used for structural floors, which have the advantages of light weight, high strength and excellent workability.

Description

All-light concrete for concrete structure floor and preparation process thereof
Technical Field
The application relates to the field of concrete building materials, in particular to all-light concrete for a concrete structure floor slab and a preparation process thereof.
Background
The light concrete is a light aggregate concrete prepared from light coarse aggregate, light fine aggregate, cementing material and water, and is a material which can bear load and preserve heat. The light concrete is used as wall board, roof board, small hollow block, etc. in Europe, USA, etc. and is used in high-rise and large-span building. The full light concrete wall board is popularized and applied in industrial and civil buildings from the 90 th of the 20 th century in China.
For example, chinese patent publication No. CN106278377A discloses a self-heat-insulating lightweight wallboard of fully recycled lightweight aggregate concrete and a preparation method thereof, the composition and mass percentage of the fully recycled lightweight aggregate concrete are as follows: and (3) cementing materials: 30-60 parts of; fully recycled lightweight aggregate: 5-40; ecological fiber: 0.05 to 0.6; physical foaming agent: 0.5 to 4; foam stabilizer: 0.02 to 0.14; water reducing agent: 0.1 to 0.8; thickening agent: 0.03 to 0.3; water: 15-35; the method comprises the following specific steps: and (3) putting the cementing material, the ecological fiber and the thickening agent which are required by the ingredients together, stirring and mixing for 5-8 minutes, then sequentially adding the water, the physical foaming agent, the foam stabilizer and the water reducing agent which are required by the ingredients, and continuously stirring for 4-8 minutes to obtain the slurry mixture.
In view of the above-mentioned related technologies, the inventor believes that lightweight aggregates with low density are easy to float upwards to different degrees in the mixing process, so that the mixed concrete presents a segregation and delamination phenomenon in a macroscopic view, and the strength and the construction performance of the all-lightweight concrete are adversely affected.
Disclosure of Invention
In order to improve the problems of lower strength and poor construction performance of the all-light concrete, the application provides the all-light concrete for the concrete structure floor slab and the preparation process thereof.
In a first aspect, the application provides a concrete structure is full light concrete for floor, adopts following technical scheme:
the all-light concrete for the concrete structure floor slab comprises the following components in parts by weight: 500 portions of cement 400-containing materials, 350 portions of fly ash 250-containing materials, 540 portions of shale ceramsite 460-containing materials, 80-100 portions of ceramic hollow microspheres, 35-45 portions of reinforcing fibers, 8-14 portions of water reducing agent, 6.5-8.5 portions of thickening agent and 400 portions of water 300-containing materials.
By adopting the technical scheme, the shale ceramsite and the ceramic hollow microspheres are adopted to replace expanded perlite in conventional all-light concrete to serve as the all-light aggregate, so that the problem of low strength of the all-light concrete caused by the expanded perlite can be effectively solved, and meanwhile, the ceramic hollow microspheres have lower density compared with the shale ceramsite, so that the apparent density and the heat conductivity coefficient of the all-light concrete can be reduced to a certain extent. By adopting the reinforcing fiber and the thickening agent, the reinforcing fiber has good adhesion effect on the lightweight fine aggregate in the all-light concrete under the thickening effect of the thickening agent, so that the floating situation of the lightweight fine aggregate is reduced, the bonding strength between the lightweight fine aggregate and the cementing material is improved, and the mechanical strength of the all-light concrete is further improved.
Preferably, the all-light concrete for the concrete structure floor slab comprises the following components in parts by weight: 475 parts of cement 425-.
By adopting the technical scheme, experimental data show that when the components of the all-light concrete are proportioned according to the using amount, the mechanical property of the all-light concrete is more excellent.
Preferably, the density of the shale ceramsite is 200-300kg/m3The porosity is 58-65% and 5-25mm continuous gradation.
By adopting the technical scheme, the shale ceramsite according with the parameter indexes has lighter self weight and better adsorption effect, and simultaneously can also ensure better bearing strength, so that the water retention is improved, the construction performance is better, the light aggregate is not easy to float upwards, and the shale ceramsite is not easy to hollowly after being hardened. The 5-25mm continuous gradation can effectively reduce the internal defects in the all-light concrete and effectively improve the mechanical property of the concrete.
Preferably, the ceramic hollow microspheres have the particle size of 0.8-1.6mm and the bulk density of 130-140kg/m3The wall thickness is 0.2-0.5 mm.
By adopting the technical scheme, the ceramic hollow microspheres meeting the parameter indexes have proper particle size and stacking density, and simultaneously have better mechanical strength and dispersion performance, so that the internal structure of the all-light concrete can be effectively improved, and the reinforcing effect is achieved.
Preferably, the reinforcing fibers comprise at least one of steel fibers, glass fibers, synthetic fibers, carbon fibers, and polypropylene fibers.
By adopting the technical scheme, the steel fibers, the glass fibers, the synthetic fibers, the carbon fibers and the polypropylene fibers are cheap and easy to obtain, can achieve a good reinforcing effect on concrete, can also generate good adhesion with the light aggregate, and reduce the floating condition of the light aggregate.
Preferably, the reinforcing fibers have a length of 8 to 12mm and a diameter of 0.5 to 1.0 mm.
By adopting the technical scheme, the experimental data show that when the reinforcing fiber with the length of 8-12mm and the diameter of 0.5-1.0mm is adopted, the construction performance and the mechanical property of the all-light concrete are better improved.
Preferably, the thickener is powdered hydroxyethyl methylcellulose.
By adopting the technical scheme, the hydroxyethyl methyl cellulose has a surface activity function after being dissolved in water, not only has a thickening effect, but also can be used as a dispersant, so that the dispersity between the concrete lightweight aggregate and the cementing material is improved, and the internal structure of the concrete is better improved.
Preferably, the viscosity of the hydroxyethyl methylcellulose is 50000-150000 Pa.s.
By adopting the technical scheme, the hydroxyethyl methyl cellulose with the viscosity of 50000-150000 Pa.s has moderate viscosity, not only can effectively reduce the floating condition of the light aggregate, but also can ensure the good construction performance of the mixed concrete.
In a second aspect, the present application provides a method for preparing a light concrete for a concrete structure floor slab, which adopts the following technical scheme:
a preparation method of full light concrete for a concrete structure floor slab comprises a cementing material premixing procedure, a light aggregate premixing procedure and a concrete mixing procedure;
wherein, the cementing material is premixed: weighing the raw materials according to the proportion, mixing and uniformly stirring the cement, the fly ash and the thickening agent to obtain a premixed gelling material;
pre-mixing light aggregate: mixing and uniformly stirring shale ceramsite, ceramic hollow microspheres and reinforcing fibers to obtain premixed aggregate; mixing concrete: and adding the premixed aggregate into the premixed gel material, stirring while adding, keeping stirring for 150 plus 180 seconds after the addition is finished, continuously adding the water reducing agent and the water, and stirring for 120 plus 150 seconds to obtain the blended all-light concrete.
By adopting the technical scheme, as the cementing material premixing procedure, the light aggregate premixing procedure and the concrete mixing procedure are adopted, the cementing material and the light aggregate can be respectively premixed and dispersed in advance, the material dispersion is more uniform during the final remixing, the internal defects of the concrete are fewer, and the construction performance and the mechanical performance of the concrete are finally improved.
In summary, the present application has the following beneficial effects:
1. the shale ceramsite and the ceramic hollow microspheres are adopted to replace expanded perlite in conventional all-light concrete to serve as the all-light aggregate, so that the problem of low strength of the all-light concrete caused by the expanded perlite can be effectively solved, and meanwhile, the reinforcing fibers and the thickening agent are adopted, so that the reinforcing fibers play a good adhesion role on the light fine aggregate in the all-light concrete under the thickening effect of the thickening agent, so that the floating situation of the light fine aggregate is reduced, the bonding strength between the light fine aggregate and a cementing material is improved, and the mechanical strength of the all-light concrete is further improved.
2. The density of 200-300kg/m is preferably used in this application3The shale ceramsite with the porosity of 58-65 percent and 5-25mm continuous gradation has lighter self weight and better adsorption effect, so that the water retention is improved, the construction performance is better, the light aggregate is not easy to float upwards, and the light aggregate is not easy to hollowly after being hardened. The 5-25mm continuous gradation can effectively reduce the internal defects in the all-light concrete and effectively improve the mechanical property of the concrete.
3. According to the method, the cementing material and the light aggregate can be respectively premixed and dispersed, the materials are dispersed more uniformly when being finally stirred, the internal defects of the concrete are fewer, and the construction performance and the mechanical performance of the concrete are finally improved.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples
The present application is further described in detail with reference to the following examples, which are intended to illustrate: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and all the starting materials in the following examples were obtained from the ordinary commercial sources except for the specific conditions.
Example 1
The component contents of the all-light concrete for the concrete structure floor slab are shown in the table 1.
Table 1 examples 1-5 table of component content
Wherein the density of the shale ceramsite is 364kg/m3The porosity was 42% and 5-15mm continuous gradation.
The ceramic hollow microspheres have the particle size of 0.4-0.8mm and the bulk density of 153kg/m3The wall thickness is between 0.05 and 0.1 mm.
The reinforced fiber is steel fiber with length of 5-8mm and diameter of 0.2-0.3 mm.
The water reducing agent is carboxylic acid water reducing agent.
Dextrin is selected as the thickening agent.
The embodiment also provides a preparation method of the all-light concrete for the concrete structure floor slab, which comprises a cementing material premixing procedure, a light aggregate premixing procedure and a concrete mixing procedure;
wherein, the cementing material is premixed: weighing the raw materials according to the proportion, mixing and uniformly stirring the cement, the fly ash and the thickening agent to obtain a premixed gelling material;
pre-mixing light aggregate: mixing and uniformly stirring shale ceramsite, ceramic hollow microspheres and reinforcing fibers to obtain premixed aggregate; mixing concrete: and adding the premixed aggregate into the premixed gel material, stirring while adding, keeping stirring for 150s after the addition is finished, continuously adding the water reducing agent and the water, and stirring for 120s to obtain the blended all-light concrete.
Example 2
This example is different from example 1 in that the contents of the components are shown in table 1.
The embodiment also provides a preparation method of the all-light concrete for the concrete structure floor slab, and the preparation method is different from the embodiment 1 in that the concrete mixing process comprises the following steps: mixing concrete: and adding the premixed aggregate into the premixed gel material, stirring while adding, keeping stirring for 160s after the addition is finished, continuously adding the water reducing agent and the water, and stirring for 130s to obtain the blended all-light concrete.
Example 3
This example is different from example 1 in that the contents of the components are shown in table 1.
The embodiment also provides a preparation method of the all-light concrete for the concrete structure floor slab, and the preparation method is different from the embodiment 1 in that the concrete mixing process comprises the following steps: mixing concrete: and adding the premixed aggregate into the premixed gel material, stirring while adding, keeping stirring for 165s after the addition is finished, continuously adding the water reducing agent and the water, and stirring for 135s to obtain the blended all-light concrete.
Example 4
This example is different from example 1 in that the contents of the components are shown in table 1.
The embodiment also provides a preparation method of the all-light concrete for the concrete structure floor slab, and the preparation method is different from the embodiment 1 in that the concrete mixing process comprises the following steps: mixing concrete: and adding the premixed aggregate into the premixed gel material, stirring while adding, keeping stirring for 175s after the addition is finished, continuously adding the water reducing agent and the water, and stirring for 140s to obtain the blended all-light concrete.
Example 5
This example is different from example 1 in that the contents of the components are shown in table 1.
The embodiment also provides a preparation method of the all-light concrete for the concrete structure floor slab, and the preparation method is different from the embodiment 1 in that the concrete mixing process comprises the following steps: mixing concrete: and adding the premixed aggregate into the premixed gel material, stirring while adding, keeping stirring for 180s after the addition is finished, continuously adding the water reducing agent and the water, and stirring for 150s to obtain the blended all-light concrete.
Example 6
The embodiment is different from the embodiment 3 in that: the density of the shale ceramsite is 294kg/m3The porosity was 59% and 5-25mm continuous gradation.
Example 7
The embodiment is different from the embodiment 3 in that: the density of the shale ceramsite is 258kg/m3The porosity was 62% and 5-25mm continuous gradation.
Example 8
The embodiment is different from the embodiment 3 in that: the density of the shale ceramsite is 225kg/m3The porosity was 64% and 5-25mm continuous gradation.
Example 9
The present embodiment differs from embodiment 7 in that: the ceramic hollow microspheres have the particle size of 0.8-1.6mm and the bulk density of 138kg/m3The wall thickness is between 0.2 and 0.5 mm.
Example 10
The present embodiment differs from embodiment 7 in that: the ceramic hollow microspheres have the particle size of 0.8-1.6mm and the bulk density of 135kg/m3The wall thickness is between 0.2 and 0.5 mm.
Example 11
The present embodiment differs from embodiment 7 in that: the ceramic hollow microspheres have the particle size of 0.8-1.6mm and the bulk density of 132kg/m3The wall thickness is between 0.2 and 0.5 mm.
Example 12
The present example differs from example 10 in that reinforcing fibers are formed by mixing steel fibers and glass fibers in a mass ratio of 1: 1.
Example 13
The present example differs from example 10 in that reinforcing fibers are formed by mixing steel fibers, synthetic fibers, and polypropylene fibers at a mass ratio of 2:1: 1.
Example 14
The present embodiment is different from embodiment 10 in that the reinforcing fiber is formed by mixing steel fiber, carbon fiber and polypropylene fiber in a mass ratio of 1: 2:1 are mixed.
Example 15
This example is different from example 14 in that the reinforcing fiber has a length of 8 to 12mm and a diameter of 0.5 to 1.0 mm.
Example 16
This example is different from example 15 in that the thickener is powdered hydroxyethyl methyl cellulose and the viscosity is 40000 pas.
Example 17
This example is different from example 15 in that the thickening agent is powdered hydroxyethyl methyl cellulose and the viscosity is 65000 pas.
Example 18
This example is different from example 15 in that the thickener is hydroxyethyl methylcellulose in powder form and has a viscosity of 100000 pas.
Example 19
This example is different from example 15 in that the thickener is powdered hydroxyethyl methyl cellulose and the viscosity is 140000 pa.s.
Example 20
This example differs from example 15 in that the thickener is powdered hydroxyethyl methylcellulose and has a viscosity of 180000 pas.
Comparative example
Comparative example 1
The comparative example adopts the preparation method of the fully recycled lightweight aggregate concrete self-insulation lightweight wallboard provided by the Chinese patent with the publication number of CN106278377A in the background technology to prepare the slurry mixture.
Comparative example 2
The difference between the comparative example and the example 1 is that the mass of the shale ceramisite, the ceramic hollow bead and the like is replaced by the expanded perlite.
Comparative example 3
This comparative example differs from example 1 in that no reinforcing fibers and no thickening agent are included.
Performance test
The performance index tests were performed on the blended all-light concrete prepared in examples 1 to 20 and the slurry mixtures prepared in comparative examples 1, 2, and 3. The test data and the phenomenon records are shown in table 2.
Table 2 table of performance test data
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (9)

1. The all-light concrete for the concrete structure floor slab is characterized by comprising the following components in parts by weight: 500 portions of cement 400-containing materials, 350 portions of fly ash 250-containing materials, 540 portions of shale ceramsite 460-containing materials, 80-100 portions of ceramic hollow microspheres, 35-45 portions of reinforcing fibers, 8-14 portions of water reducing agent, 6.5-8.5 portions of thickening agent and 400 portions of water 300-containing materials.
2. The all-light concrete for a concrete structure floor according to claim 1, wherein: the paint comprises the following components in parts by weight: 475 parts of cement 425-.
3. The all-lightweight concrete for the floor slab with the concrete structure as claimed in claim 1, wherein the density of the shale ceramsite is 200-300kg/m3The porosity is 58-65% and 5-25mm continuous gradation.
4. The all-light concrete for a concrete structure floor according to claim 1, wherein: the ceramic hollow microsphere has the particle size of 0.8-1.6mm and the bulk density of 130-3The wall thickness is 0.2-0.5 mm.
5. The all-light concrete for a concrete structure floor according to claim 1, wherein: the reinforcing fiber comprises at least one of steel fiber, glass fiber, synthetic fiber, carbon fiber and polypropylene fiber.
6. The all-light concrete for a concrete structure floor according to claim 5, wherein: the length of the reinforced fiber is 8-12mm, and the diameter is 0.5-1.0 mm.
7. The all-light concrete for a concrete structure floor according to claim 1, wherein: the thickening agent is powdered hydroxyethyl methyl cellulose.
8. The all-light concrete for a concrete structure floor according to claim 7, wherein: the viscosity of the hydroxyethyl methyl cellulose is 50000-150000 Pa.s.
9. The method for producing an all-light concrete for a floor slab of a concrete structure according to any one of claims 1 to 8, wherein: comprises a cementing material premixing procedure, a light aggregate premixing procedure and a concrete mixing procedure;
wherein, the cementing material is premixed: weighing the raw materials according to the proportion, mixing and uniformly stirring the cement, the fly ash and the thickening agent to obtain a premixed gelling material;
pre-mixing light aggregate: mixing and uniformly stirring shale ceramsite, ceramic hollow microspheres and reinforcing fibers to obtain premixed aggregate;
mixing concrete: and adding the premixed aggregate into the premixed gel material, stirring while adding, keeping stirring for 150 plus 180 seconds after the addition is finished, continuously adding the water reducing agent and the water, and stirring for 120 plus 150 seconds to obtain the blended all-light concrete.
CN202011342745.8A 2020-11-25 2020-11-25 All-light concrete for concrete structure floor and preparation process thereof Pending CN112408897A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN105084833A (en) * 2015-08-06 2015-11-25 重庆科技学院 High-strength thermal insulation full lightweight concrete and preparation method and application thereof
CN105297943A (en) * 2014-07-29 2016-02-03 金承黎 Load-bearing heat-insulating decorating integrated assembled wall composited with aerogel and manufacturing method
CN106278377A (en) * 2016-08-15 2017-01-04 马鞍山十七冶工程科技有限责任公司 A kind of full regeneration lightweight aggregate concrete self-insulating light wallboard and preparation method
WO2017085667A2 (en) * 2015-11-18 2017-05-26 Italcementi S.P.A. Lightweight concrete with a high elastic modulus and use thereof
CN111205036A (en) * 2020-01-18 2020-05-29 杭州申华混凝土有限公司 High-strength lightweight concrete and preparation method thereof

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CN105297943A (en) * 2014-07-29 2016-02-03 金承黎 Load-bearing heat-insulating decorating integrated assembled wall composited with aerogel and manufacturing method
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WO2017085667A2 (en) * 2015-11-18 2017-05-26 Italcementi S.P.A. Lightweight concrete with a high elastic modulus and use thereof
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