CN115572103A - Light construction waste reclaimed sand and production method thereof - Google Patents
Light construction waste reclaimed sand and production method thereof Download PDFInfo
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- CN115572103A CN115572103A CN202211405368.7A CN202211405368A CN115572103A CN 115572103 A CN115572103 A CN 115572103A CN 202211405368 A CN202211405368 A CN 202211405368A CN 115572103 A CN115572103 A CN 115572103A
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- construction waste
- light construction
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- 239000004576 sand Substances 0.000 title claims abstract description 86
- 239000002699 waste material Substances 0.000 title claims abstract description 63
- 238000010276 construction Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000011449 brick Substances 0.000 claims abstract description 80
- 239000000843 powder Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 23
- 239000005011 phenolic resin Substances 0.000 claims abstract description 22
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 16
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 10
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 10
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 8
- 229910000077 silane Inorganic materials 0.000 claims abstract description 8
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 7
- -1 alkyl alkoxy silane Chemical compound 0.000 claims abstract description 7
- 239000011737 fluorine Substances 0.000 claims abstract description 7
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 7
- 239000010881 fly ash Substances 0.000 claims abstract description 7
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- UQMOLLPKNHFRAC-UHFFFAOYSA-N tetrabutyl silicate Chemical compound CCCCO[Si](OCCCC)(OCCCC)OCCCC UQMOLLPKNHFRAC-UHFFFAOYSA-N 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000004035 construction material Substances 0.000 claims description 3
- 239000010813 municipal solid waste Substances 0.000 abstract description 8
- 239000004566 building material Substances 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 80
- 238000006243 chemical reaction Methods 0.000 description 19
- 239000004570 mortar (masonry) Substances 0.000 description 12
- 239000011148 porous material Substances 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 7
- 239000002910 solid waste Substances 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000011362 coarse particle Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- 229910000323 aluminium silicate Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 239000012190 activator Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000005543 nano-size silicon particle Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRXOKRLIIVYICJ-UHFFFAOYSA-N butoxy(trihydroxy)silane Chemical compound CCCCO[Si](O)(O)O BRXOKRLIIVYICJ-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- UFULAYFCSOUIOV-UHFFFAOYSA-N cysteamine Chemical compound NCCS UFULAYFCSOUIOV-UHFFFAOYSA-N 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 125000003709 fluoroalkyl group Chemical group 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/12—Condensation polymers of aldehydes or ketones
- C04B26/122—Phenol-formaldehyde condensation polymers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/022—Agglomerated materials, e.g. artificial aggregates agglomerated by an organic binder
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use 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
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
- C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The application relates to the technical field of building materials, and particularly discloses light building rubbish reclaimed sand and a production method thereof. The raw materials of the light construction waste reclaimed sand comprise; 10-30 parts of aerated brick powder; 20-40 parts of red brick powder; 12-20 parts of fly ash; 2-6 parts of tetraethoxysilane; 5-9 parts of alkaline phenolic resin; 7-11 parts of water. The production method comprises the following steps: s1: drying and grinding the aerated bricks and the red bricks into powder, adding the fly ash, and uniformly stirring to obtain a mixture; s2: adding tetraethyl orthosilicate and water into the mixture obtained in the step S1, uniformly stirring, adding alkaline phenolic resin, fluorine-containing alkyl alkoxy silane and slaked lime, and continuously uniformly stirring to obtain slurry; s3: drying the slurry prepared in the step S2 to prepare dry particles; s4: and (4) maintaining the dried particles prepared in the step (S3) to obtain the reclaimed sand. It has the advantage of reinforcing reclaimed sand intensity.
Description
Technical Field
The application relates to the technical field of building materials, in particular to light building garbage reclaimed sand and a production method thereof.
Background
Along with the rapid development of urban construction and the continuous improvement of the urbanization rate in China, a large amount of construction waste is generated in building demolition, old house reconstruction, extension and reconstruction projects, the generation amount of the construction waste in China is huge, and the mining supply of sand and stone raw materials with huge demand required by waste concrete causes irreversible influence on the environment continuously, so the social demand of producing reclaimed sand by using solid waste is increasingly strong.
In the related technology, the construction waste contains a large amount of sandstone aggregate, and the construction waste is crushed, screened, classified and cleaned and then mixed according to a certain proportion to form recycled aggregate.
In the related technology, because of the large amount of old mortar in the recycled aggregate, the recycled aggregate has certain defects in various mechanical properties compared with natural sand, especially for red bricks, aerated bricks and the like which occupy large quantity in construction waste, the recycled sand prepared from the red bricks and the aerated bricks has large porosity, high water absorption rate and low strength, and is not suitable for being made into concrete recycled aggregate if being recycled, so that the application range of the recycled aggregate is limited.
Disclosure of Invention
In order to strengthen the strength of the reclaimed sand, the application provides the light construction waste reclaimed sand and a production method thereof.
First aspect, this application provides a light construction waste reclaimed sand, adopts following technical scheme:
the light construction waste reclaimed sand is prepared from the following raw materials in parts by weight:
10-30 parts of aerated brick powder;
20-40 parts of red brick powder;
12-20 parts of fly ash;
2-6 parts of ethyl orthosilicate;
5-9 parts of alkaline phenolic resin;
7-11 parts of water.
By adopting the technical scheme, the aerated bricks and the red bricks are common light-weight garbage in construction garbage, have larger porosity, high water absorption and low strength, and are hydrolyzed by adding n-butyl orthosilicate to generate nano-silica which can be adsorbed in the pores of the waste bricks, so that the pores of the waste bricks can be filled, the compactness of the reclaimed sand is improved, and the reclaimed sand can reach certain strength in application.
Meanwhile, the butyl orthosilicate is used as a curing agent of the alkaline phenolic resin, and the butyl orthosilicate and the alkaline phenolic resin are subjected to a cross-linking reaction to form a net structure on the surface of the waste rotary powder, so that the strength of the reclaimed sand is improved.
Preferably, the reclaimed sand also comprises 2-5 parts of slaked lime.
By adopting the technical scheme, the slaked lime can be used as an alkali activator of the red brick powder, so that under the excitation action of the slaked lime, the silicon-aluminum phase of the red brick powder forms a three-dimensional network-structure polymerized aluminosilicate gel, and the red brick powder can be used as a cementing material to partially replace cement, and in addition, due to the volcanic ash activity of the red brick powder, the silicon-aluminum phase in the red brick powder can be mixed with Ca (OH) 2 The reaction generates CSH, CAH and CASH gel, and the newly generated gel can fill the pores, thereby improving the compactness of the reclaimed sand and increasing the early strength of the reclaimed sand.
Preferably, the reclaimed sand further comprises 1-3 parts of fluorine-containing alkyl alkoxy silane.
By adopting the technical scheme, the fluoroalkyl alkoxy silane is added into the reclaimed sand, and the phenolic resin is subjected to interface modification, so that the contact state of the resin and the surface of the brick powder can be improved, the dispersibility of the phenolic resin in the brick powder is improved, and the bonding strength of the cured strong-alkaline phenolic resin is improved. Meanwhile, the fluorine-containing alkyl alkoxy silane can increase the hydrophobic property of the reclaimed sand, so that the water absorption of the reclaimed sand is reduced.
Preferably, the particle size of the red brick powder is 20-60 μm.
By adopting the technical scheme, as the red brick powder has higher water absorption rate and low early strength, the coarse particles are ground into the fine particles, coarse particles, especially porous particle bonding bodies are damaged, the internal pore structure of the waste red brick powder particles is improved, the friction in the mixing process is reduced, the waste red brick powder particles have larger specific surface area and higher reaction activity, the contact reaction with other active components is more sufficient, and the reaction forms stronger bond energy, so that the prepared reclaimed sand has better strength.
In a second aspect, the application provides a production method of light construction waste reclaimed sand, which adopts the following technical scheme:
a production method of light construction waste reclaimed sand comprises the following preparation steps:
s1: drying and grinding the aerated bricks and the red bricks into powder, adding the fly ash, and uniformly stirring to obtain a mixture;
s2: adding butyl orthosilicate and water into the mixture obtained in the step S1, uniformly stirring, adding alkaline phenolic resin, fluorine-containing alkyl alkoxy silane and slaked lime, and continuously and uniformly stirring to obtain slurry;
s3: drying the slurry prepared in the step S2 to prepare dry particles;
s4: and (4) maintaining the dried particles prepared in the step (S3) to obtain the reclaimed sand.
By adopting the technical scheme, the waste bricks are firstly ground into a certain fineness, the initial pore structure of the waste bricks is damaged, the specific area and the reaction activity are increased, then the n-butyl silicate is added, the n-butyl silicate is hydrolyzed to generate the nano silicon dioxide, the nano particles are filled in the pores of the waste brick powder in the stirring process, the compactness and the strength of the regenerated sand are reduced, meanwhile, the alkaline phenolic resin and the n-butyl silicate are subjected to a cross-linking reaction to form a network structure on the surfaces of the brick powder particles, and the strength of the regenerated sand is improved. Therefore, the prepared light construction waste reclaimed sand has the advantages of low water absorption, high strength and high utilization rate of solid wastes, and overcomes the defects of the traditional solid waste reclaimed sand.
Preferably, the aerated brick in the step S1 is subjected to ball milling for 2-4 hours by a ball mill.
By adopting the technical scheme, along with the prolonging of the ball milling time, the specific surface area of the waste brick powder is increased, the activity is improved, the surface structure of the waste brick powder is damaged by the action of mechanical force, especially a porous particle bonding body, the reaction contact surface is increased, a large amount of hydration products such as tobermorite and calcite are arranged in the waste aerated brick powder, the interaction between the activated waste aerated brick powder and other active components is remarkable, the internal structure of the reclaimed sand is more compact, and the strength of the reclaimed sand is improved.
Preferably, the curing temperature of the dried granules in the step S4 is 60-75 ℃.
By adopting the technical scheme, the reaction degree at the initial stage is higher due to the higher initial curing temperature, more gel is formed to cover the surface of unreacted raw material particles, the later strength is improved more, the full reaction of active molecules in slurry can be accelerated, the regenerated sand obtains better mechanical strength and excellent durability, and proper high-temperature curing is necessary.
Preferably, the light construction waste reclaimed sand is applied to preparation of construction materials.
In summary, the present application has the following beneficial effects: the light construction waste is recycled to produce the reclaimed sand, natural sand is replaced, the pollution of construction waste solid waste to the environment is reduced, the produced reclaimed sand has the advantages of low water absorption and high strength, the defects of the traditional solid waste reclaimed sand are overcome, and the application range of the reclaimed sand in construction materials is enlarged.
1. Because this application adopts n-butyl silicate and alkaline phenolic resin to combine, aerated brick and red brick are common light rubbish among the building rubbish, and it has great porosity, and the water absorption rate is high, and intensity is low, through adding n-butyl silicate, hydrolyzes and generates nanometer silica, because red brick powder and aerated brick powder have the internal porosity height, consequently nanometer silica can adsorb in the hole of abandonment brick to can fill the hole of abandonment brick, improve the closely knit degree of regeneration sand, make it reach certain intensity in using.
Meanwhile, the butyl orthosilicate can be used as a curing agent of the alkaline phenolic resin, and the butyl orthosilicate and the alkaline phenolic resin are subjected to a cross-linking reaction to form a three-dimensional network structure on the surface of the waste rotary powder, so that the strength of the reclaimed sand is improved. .
2. In the application, slaked lime is preferably adopted, and can be used as an alkali activator of red brick powder, so that under the excitation action of the slaked lime, the silicon-aluminum phase of the red brick powder forms a three-dimensional network polymerized aluminosilicate gel, and the three-dimensional network polymerized aluminosilicate gel can be used as a cementing material and an auxiliary cementing material to partially replace cement.
3. According to the method, the waste bricks are ground into a certain fineness, the initial pore structure of the waste bricks is damaged, the specific area and the reaction activity are increased, then butyl orthosilicate is added, the butyl orthosilicate generates nano silicon dioxide under hydrolysis, nano particles fill the pores of waste brick powder in the stirring process, the compactness and the strength of the regenerated sand are reduced, meanwhile, alkaline phenolic resin and butyl orthosilicate are subjected to a cross-linking reaction, a network structure is formed on the surfaces of the waste brick powder particles, and the strength of the regenerated sand is improved. Therefore, the prepared light construction waste reclaimed sand has the advantages of low water absorption, high strength and high utilization rate of solid wastes, and overcomes the defects of the traditional solid waste reclaimed sand.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation of alkaline phenol resin
Preparation example 1
S1, adding 0.3kg of phenol and 0.15kg of KOH into a reactor, heating to 70 ℃, and slowly dropwise adding 0.6kg of formaldehyde under stirring to react for about 15min;
and S2, adding 0.15kg of KOH and 0.3kg of formaldehyde on the basis of the step S1, heating to 75 ℃, reacting for 2 hours, cooling to room temperature, and performing vacuum dehydration to obtain the alkaline phenolic resin.
Examples
Example 1
S1: drying waste aerated bricks and red bricks, crushing the dried waste aerated bricks and red bricks by a crusher, then performing ball milling treatment by a ball mill, grinding the dried waste aerated bricks and red bricks into powder, sieving the powder to prepare aerated brick powder and red brick powder, adding fly ash, and uniformly stirring the mixture to obtain a mixture, wherein the particle size of the red brick powder is 45 microns, and ball milling the aerated bricks for 3 hours by the ball mill;
s2: adding butyl orthosilicate and water into the mixture obtained in the step S1, stirring for 30min, then adding the alkaline phenolic resin prepared in the preparation example 1 and the fluorine-containing alkyl alkoxy silane, stirring for 15min, adding slaked lime, and continuously stirring uniformly to obtain slurry;
s3: drying the slurry prepared in the step S2 to prepare dry particles;
s4: and (4) curing the dried particles prepared in the step (S3) at 65 ℃ for 7d to obtain the light construction waste reclaimed sand.
Example 2
The light construction waste reclaimed sand is different from the reclaimed sand in the embodiment 1 in that the grain diameter of red brick powder is 20 microns, the curing temperature of the dried grains in the step S4 is 60 ℃, and the aerated brick is subjected to ball milling for 2 hours by a ball mill.
Example 3
The difference between the light construction waste reclaimed sand and the embodiment 1 is that the grain diameter of red brick powder is 60 mu m, the curing temperature of the dried grains in the step S4 is 75 ℃, and the aerated brick is subjected to ball milling for 4 hours by a ball mill.
The raw material components and their corresponding parts by weight of examples 1-3 are shown in table 1.
TABLE 1 materials and weights (kg) thereof in examples 1-3
Example 4
The difference between the light construction waste reclaimed sand and the embodiment 2 is that the grain diameter of red brick powder is 15 mu m.
Example 5
The light construction waste reclaimed sand is different from the reclaimed sand in the embodiment 3 in that the grain diameter of red brick powder is 60 mu m.
Example 6
The difference between the light construction waste reclaimed sand and the embodiment 2 is that the curing temperature of the dried particles in the step S4 is 50 ℃.
Example 7
A lightweight construction waste reclaimed sand differing from example 3 in that the curing temperature of the dried particles in step S4 was 80 ℃.
Example 8
The difference between the light construction waste reclaimed sand and the embodiment 2 is that the aerated brick in the step S1 is subjected to ball milling for 1 hour by a ball mill.
Example 9
The difference between the light construction waste reclaimed sand and the embodiment 3 is that the aerated brick in the step S1 is subjected to ball milling for 5 hours by a ball mill.
Comparative example
Comparative example 1
The light construction waste reclaimed sand is different from the reclaimed sand in the embodiment 1 in that the raw material does not contain n-butyl silicate.
Comparative example 2
The light construction waste reclaimed sand is different from the reclaimed sand in the embodiment 1 in that the raw material does not contain alkaline phenolic resin.
Performance test
1. The apparent density and bulk density of the reclaimed sands prepared in examples 1 to 9 and comparative examples 1 to 2 were tested according to the standard GB/T25176-2010 "recycled fine aggregate for concrete and mortar", and the reclaimed sands prepared in examples 1 to 9 and comparative examples 1 to 2 were prepared into mortar, and the water demand ratio and the mortar strength ratio were tested.
2. Regenerating mortar: preparing mortar by using reclaimed sand, cement and water according to a method specified by the standard;
reference mortar: preparing mortar by using standard sand, cement and water according to a method specified by the standard; water demand ratio: the water consumption of the mortar prepared from the reclaimed sand reaches a certain fluidity and is in proportion to the water consumption of the standard mortar. Strength ratio: the compressive strength ratio of the mortar test piece prepared from the reclaimed sand to the standard mortar test piece.
TABLE 2 Performance test results
It can be seen by combining examples 1 and 4-5 and table 2 that each test performance of example 1 is better than that of examples 4-5, because the waste brick powder has higher water absorption rate and low early strength, the coarse particles are ground into fine particles, coarse particles, especially porous particle bonding bodies are destroyed, the internal pore structure of the waste red brick powder particles is improved, the apparent density and the bulk density of the reclaimed sand are improved, the friction in the mixing process is reduced, the reclaimed sand has larger specific surface area and higher reaction activity, the contact reaction with other active components is more sufficient, and the reaction forms stronger bond energy, so that the prepared reclaimed sand has better strength.
It can be seen from the combination of example 1 and examples 6-7 and table 2 that the water demand ratio and compressive strength ratio of example 1 are better than those of examples 6-7, and a proper curing temperature is necessary, and a certain curing temperature enables the initial reaction degree to be higher, can accelerate the full reaction of active molecules in slurry, can form more gel bodies to cover the surfaces of unreacted raw material particles, and the newly formed gel bodies can fill pores, so that the compactness of the reclaimed sand is improved, and the reclaimed sand can also obtain better mechanical strength and excellent durability.
By combining the embodiment 1 and the comparative examples 1-2 and the table 2, the test performances of the embodiment 1 are superior to those of the comparative examples 1-2, the aerated bricks and the red bricks are common light-weight garbage in construction garbage, the aerated bricks and the red bricks have larger porosity, high water absorption and low strength, and the nano-silica is generated by hydrolysis by adding n-butyl silicate and can be adsorbed in the pores of the waste bricks, so that the pores of the waste bricks can be filled, the compactness of the reclaimed sand is improved, and the reclaimed sand can achieve certain strength in application.
Meanwhile, the butyl orthosilicate is used as a curing agent of the alkaline phenolic resin, and the butyl orthosilicate and the alkaline phenolic resin are subjected to a cross-linking reaction to form a net structure on the surface of the waste rotary powder, so that the strength of the reclaimed sand is improved.
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 (8)
1. The light construction waste reclaimed sand is characterized by comprising the following raw materials in parts by weight:
10-30 parts of aerated brick powder;
20-40 parts of red brick powder;
12-20 parts of fly ash;
2-6 parts of tetraethoxysilane;
5-9 parts of alkaline phenolic resin;
7-11 parts of water.
2. The light construction waste reclaimed sand of claim 1, which is characterized in that: the reclaimed sand also comprises 2-5 parts of slaked lime.
3. The light construction waste reclaimed sand of claim 1, which is characterized in that: the reclaimed sand also comprises 1-3 parts of fluorine-containing alkyl alkoxy silane.
4. The light construction waste reclaimed sand of claim 1, which is characterized in that: the grain diameter of the red brick powder is 20-45 μm.
5. The method for producing the light construction waste reclaimed sand as claimed in any one of claims 1 to 4, wherein the method comprises the following steps: the method comprises the following steps:
s1: drying and grinding the aerated bricks and the red bricks into powder, adding the fly ash, and uniformly stirring to obtain a mixture;
s2: adding butyl orthosilicate and water into the mixture obtained in the step S1, uniformly stirring, then adding alkaline phenolic resin, fluorine-containing alkyl alkoxy silane and slaked lime, and continuously and uniformly stirring to obtain slurry;
s3: drying the slurry prepared in the step S2 to prepare dry particles;
s4: and (4) maintaining the dried particles prepared in the step (S3) to obtain the reclaimed sand.
6. The production method of the light construction waste reclaimed sand as claimed in claim 5, wherein the production method comprises the following steps: and (2) ball-milling the aerated bricks in the step (S1) for 2-4 hours by using a ball mill.
7. The production method of the light construction waste reclaimed sand as claimed in claim 5, wherein the production method comprises the following steps: the curing temperature of the dried particles in the step S4 is 60-75 ℃.
8. Use of the light construction waste reclaimed sand as defined in any one of claims 1 to 4 in the preparation of construction materials.
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