CN109231923A - A method of regeneration ECC is prepared using waste concrete fine powder - Google Patents

A method of regeneration ECC is prepared using waste concrete fine powder Download PDF

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Publication number
CN109231923A
CN109231923A CN201811266129.1A CN201811266129A CN109231923A CN 109231923 A CN109231923 A CN 109231923A CN 201811266129 A CN201811266129 A CN 201811266129A CN 109231923 A CN109231923 A CN 109231923A
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China
Prior art keywords
parts
waste concrete
fine powder
water
regeneration ecc
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CN201811266129.1A
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Chinese (zh)
Inventor
张利俊
秦宪明
项斌峰
王灵秀
刘新状
邱洪华
蔡素燕
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China Building Materials Certification & Inspection Group Beijing Tianyu Co Ltd
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China Building Materials Certification & Inspection Group Beijing Tianyu Co Ltd
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Priority to CN201811266129.1A priority Critical patent/CN109231923A/en
Publication of CN109231923A publication Critical patent/CN109231923A/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
    • C04B28/04Portland cements
    • 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/30Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

Abstract

The invention discloses a kind of methods for preparing regeneration ECC using waste concrete fine powder, obtain after being crushed, stirred by the group lease making of following parts by weight: 15~40 parts of cement, 10~40 parts of waste concrete fine powder, 10~60 parts of flyash, 20~40 parts of water, 0.2~2 part of water-reducing agent, 0.01~0.5 part of reinforcing agent and 1~4 part of chemical synthetic fiber.Regeneration ECC of the invention, slurry initial flow degree is big, reaches 200~400mm;28 days compression strength reaches 50.0MPa or more, and axial tensile strength reaches 5.0MPa or more;Limit elongation is up to 3.0% or more, 90 μm~150 μm of average crack width, average crack number 20~35.Method of the present invention using waste concrete fine powder preparation regeneration ECC, simple process;Cement glue material is substituted using the waste concrete micro mist that building is removed, makes a silk purse out of a sow's ear, carries out comprehensive utilization of resources.

Description

A method of regeneration ECC is prepared using waste concrete fine powder
Technical field
It is a kind of high ductility fiber reinforced cement-based composite material and its system the present invention relates to a kind of cement-base composite material Preparation Method, and in particular to it is a kind of using solid waste preparation with high ductility, strain hardening, multiple crack growth regeneration Gao Yan Property fiber reinforced cement-based composite material and preparation method thereof, belongs to the field of building materials.
Background technique
High ductility fiber reinforced cement-based composite material (Engineered Cementitious Composites, ECC) It is one kind using fiber as reinforcing material, using cement, mineral admixture and concrete admixture as raw matrix materials, through adding water to stir It mixes, form, conserving preparation, with the composite material of multiple crack growth characteristic under the tensile load of axle center.Its fundamental characteristics is flat Equal fracture width is no more than 200 μm and ultimate elongation is not less than 1%.High ductility fiber reinforced cement-based composite material (Engineered Cementitious Composites, ECC) can be used for the antidetonation coupling beam of building, Column border node, or production resists Dissipative member is shaken, the anti-seismic performance of buildings or structures is improved.
Waste concrete is that a kind of building is removed the rubbish solid waste to be formed, and is building because reaching service life or because of aging It is demolished, the solid waste of generation, it is main in concrete fine powder by waste concrete crushing and grinding at concrete fine powder Ingredient has cement granules, the concrete of the hydrolysis product of cement such as AFt, AFm, C-S-H gel, drated calcium aluminate, incomplete aquation Fine powder material (the predominantly SiO that aggregate is levigate2、CaCO3Deng) etc..Waste concrete fine powder is according to ingredient difference, and active size is not Together.
The present invention is prepared using waste concrete fine powder replacing partial cement with high compressive strength, high ductility, strain The regeneration ECC of hardening and multiple crack growth.A kind of high-intensitive high ductility of building solid waste preparation provided by the invention regenerates ECC and its system It is excellent to prepare regeneration ECC performance indicator using waste concrete fine powder, while waste concrete has been carried out recycling for Preparation Method Development and utilization, protect natural environment.
Summary of the invention
Problem to be solved by this invention is to prepare high-quality cement-based material using solid waste.The present invention provides a kind of utilization The high ductility fiber reinforced cement-based composite material of the regeneration that waste concrete fine powder is prepared: using after working process Waste concrete fine powder substitutes cement cementitious material, prepares with high compressive strength, high ductility, strain hardening and multiple crack growth The high ductility fiber reinforced cement-based composite material of regeneration.The high ductility fiber of regeneration prepared using waste concrete fine powder is increased Strong cement-base composite material (regeneration ECC) performance indicator is excellent: 28 days compression strength of the regeneration ECC of preparation up to 50.0MPa with On, axial tensile strength reaches 5.0MPa or more, and limit elongation is put down up to 3.0% or more, 90 μm~150 μm of average crack width Equal fracture number 20~35, the characteristic with strain hardening and multiple crack growth.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of regeneration ECC being prepared using waste concrete fine powder, it is broken, levigate by the group lease making of following parts by weight With obtained after stirring: 15~40 parts of cement, 10~40 parts of waste concrete fine powder, 10~60 parts of flyash, 20~ 40 parts of water, 0.2~2 part of water-reducing agent, 0.01~0.5 part of reinforcing agent and 1~4 part of chemical synthetic fiber.
In above-mentioned technical proposal, the cement is ordinary portland cement 42.5.
In above-mentioned technical proposal, the waste concrete fine powder, for the useless coagulation generated in existing building demolishing process The powder that soil obtains after broken, levigate and screening, specific surface area are 400~600m2/kg。
In above-mentioned technical proposal, the flyash is I grades, II grade of flyash, and specific surface area is 500~850m2/kg。
In above-mentioned technical proposal, the water-reducing agent, including but not limited to naphthalene water reducer, aminosulfonic water-reducing agent, Melamine system water reducer, polycarboxylate high performance water-reducing agent, preferably high performance water reducing agent of polyocarboxy acid.
In above-mentioned technical proposal, the reinforcing agent, including but not limited to alcamines, alcohols, carbohydrate, Sulfates, chlorine Salt reinforcing agent, preferably Sulfates reinforcing agent, further preferably aluminum sulfate salt.
In above-mentioned technical proposal, the chemical synthetic fiber is vinal;20 μm~50 μm of fibre diameter, Fibre length is 5mm~25mm.
The present invention also provides the preparation methods of above-mentioned regeneration ECC a kind of, comprising the following steps:
It (1), be specific surface area by the waste concrete pulverizing and jevigating generated in existing building demolishing process is 400~600m2/ The powder of kg takes sieve bottom to obtain waste concrete fine powder, for use after screening;
(2), waste concrete fine powder, 10~60 parts of the powder for obtaining 15~40 parts of cement, 10~40 parts of steps (1) 30s is stirred with 58~65 revs/min of speed after coal ash mixing;Then plus 20~40 parts of water is low with 62~67 revs/min Speed stirring 2min;It is slowly added into 0.2~2 part of water-reducing agent and 0.01~0.5 part of reinforcing agent, and again later with 115~135 Rev/min acceleration stirring 1.5min after obtain Uniform Flow substrate;After the completion of stirring, the substrate of Uniform Flow is obtained, just Beginning fluidity is 200~400mm;
(3), after step (2) obtains the substrate of Uniform Flow, using 57~63 revs/min of the 3min that stirs at low speed, during which 1~4 part of chemical synthetic fiber is slowly added to ensure that fiber can be uniformly distributed without there is clustering phenomena by hand, and fiber exists It is added in 2min, regeneration ECC is obtained after the completion of stirring at low speed.
In above-mentioned technical proposal, step (2), step (3) the entire whipping process used time are 8~12min.
Compared with prior art, the high ductility regeneration ECC of the high resistance to compression of waste concrete fine powder preparation of the invention have with It is lower the utility model has the advantages that
1. it is big to regenerate ECC slurry initial flow degree, reach 200~400mm.
2. reaching 50.0MPa or more, axle center tension using 28 days compression strength of the regeneration ECC of waste concrete fine powder preparation Intensity reaches 5.0MPa or more, has excellent performance.
3. strain hardening and the multiple crack growth excellent of the regeneration ECC of waste concrete fine powder preparation, limit elongation Up to 3.0% or more, 90 μm~150 μm of average crack width, average crack number 20~35.
4. the present invention using waste concrete fine powder preparation regeneration ECC simple process, removed using building Waste concrete fine powder substitutes cement glue material, makes a silk purse out of a sow's ear, and carries out comprehensive utilization of resources.
Specific embodiment
The specific embodiment of technical solution of the present invention is described in detail below, but the present invention is not limited in being described below Hold:
Embodiment 1:
A kind of regeneration ECC being prepared using waste concrete fine powder, is comprised the following components in parts by weight, component ratio Are as follows: cement, waste concrete powder, flyash, water, water-reducing agent, reinforcing agent, chemical synthetic fiber weight ratio be 29.05:21.79: 21.79:25.42:0.44:0.04:1.49.
The cement is ordinary portland cement 42.5;
The waste concrete fine powder, the waste concrete to generate in existing building demolishing process pass through broken, grinding, sieve The powder obtained after point, specific surface area 490m2/kg;
The flyash is I grades of flyash, specific surface area 650m2/kg;
The water-reducing agent is high performance water reducing agent of polyocarboxy acid;
The reinforcing agent is aluminum sulfate salt reinforcing agent;
The chemical synthetic fiber is vinal;36 μm of fibre diameter, fibre length 12mm.
The above-mentioned high ductility fiber reinforced cement-based composite material of regeneration is prepared by following methods:
It (1), be specific surface area by the waste concrete crushing and grinding generated in existing building demolishing process is 490m2/ kg's Powder takes sieve bottom to obtain waste concrete fine powder, for use after screening;
(2), waste concrete fine powder, 21.79 parts of the fine coal for obtaining 29.05 parts of cement, 21.79 parts of steps (1) 30s (60 revs/min of mixing speed) is mixed in ash, then plus 25.42 parts of water stir at low speed 2min (65 turns of mixing speed/ Minute), it is slowly added into 0.44 part of water-reducing agent and 0.04 part of reinforcing agent again later, and accelerate to stir 1.5min (mixing speed 125 revs/min) afterwards obtain Uniform Flow substrate, initial flow degree be 360mm;
(3), after step (2) obtains the substrate of Uniform Flow, using stirring at low speed 3min (60 revs/min of mixing speed), Period is slowly added to 1.49 parts of chemical synthetic fiber by hand to ensure that fiber can be uniformly distributed without there is clustering phenomena, fine Dimension adds in 2min;Regeneration ECC is obtained after the completion of stirring at low speed.
Obtained regeneration ECC is conserved in standard curing room to 28 days, 28 days compression strength is 56MPa, axle center tension is strong Degree be 5.4MPa, limit elongation 3.5%, 126 μm of average crack width, average crack number 28.
Embodiment 2:
A kind of regeneration ECC being prepared using waste concrete fine powder, is comprised the following components in parts by weight, component ratio Are as follows: cement, waste concrete powder, flyash, water, water-reducing agent, reinforcing agent, chemical synthetic fiber weight ratio be 25.42:14.52: 32.68:29.05:0.51:0.06:1.34.
The cement is ordinary portland cement 42.5;
The waste concrete fine powder, the waste concrete to generate in existing building demolishing process pass through broken, grinding, sieve The powder obtained after point, specific surface area 520m2/kg;
The flyash is I grades of flyash, specific surface area 680m2/kg;
The water-reducing agent is high performance water reducing agent of polyocarboxy acid;
The reinforcing agent is aluminum sulfate salt reinforcing agent;
The chemical synthetic fiber is vinal;42 μm of fibre diameter, fibre length 10mm.
Above-mentioned regeneration ECC is prepared by following methods:
It (1), be specific surface area by the waste concrete crushing and grinding generated in existing building demolishing process is 520m2/ kg's Powder takes sieve bottom to obtain waste concrete fine powder, for use after screening;
(2), waste concrete fine powder, 32.68 parts of the fine coal for obtaining 25.42 parts of cement, 14.52 parts of steps (1) 40s (58 revs/min of mixing speed) is mixed in ash, then plus 29.05 parts of water stir at low speed 2min (67 turns of mixing speed/ Minute), it is slowly added into 0.51 part of water-reducing agent and 0.06 part of reinforcing agent again later, and accelerate to stir 2min (mixing speed 120 Rev/min) afterwards obtain Uniform Flow substrate, initial flow degree be 300mm;
(3), after step (2) obtains the substrate of Uniform Flow, using stirring at low speed (61 revs/min of mixing speed of 3.5min Clock), it is slowly added to 1.34 parts of chemical synthetic fiber by hand during which to ensure that it is existing without there is conglomeration that fiber can be uniformly distributed As fiber adds in 2min;Regeneration ECC is obtained after the completion of stirring at low speed.
Obtained regeneration ECC is conserved in standard curing room to 28 days, 28 days compression strength is 52MPa, axle center tension is strong Degree be 5.2MPa, limit elongation 4.1%, 108 μm of average crack width, average crack number 32.
Embodiment 3:
A kind of regeneration ECC being prepared using waste concrete fine powder, is comprised the following components in parts by weight, component ratio Are as follows: cement, waste concrete powder, flyash, water, water-reducing agent, reinforcing agent, chemical synthetic fiber weight ratio be 17.81:17.81: 35.61:29.05:0.57:0.08:1.46.
The cement is ordinary portland cement 42.5;
The waste concrete fine powder, the waste concrete to generate in existing building demolishing process pass through broken, grinding, sieve The powder obtained after point, specific surface area 560m2/kg;
The flyash is I grades of flyash, specific surface area 730m2/kg;
The water-reducing agent is high performance water reducing agent of polyocarboxy acid;
The reinforcing agent is aluminum sulfate salt reinforcing agent;
The chemical synthetic fiber is vinal;32 μm of fibre diameter, fibre length 14mm.
Above-mentioned regeneration ECC is prepared by following methods:
It (1), be specific surface area by the waste concrete crushing and grinding generated in existing building demolishing process is 560m2/ kg's Powder takes sieve bottom to obtain waste concrete fine powder, for use after screening;
(2), waste concrete fine powder, 35.61 parts of the fine coal for obtaining 17.81 parts of cement, 17.81 parts of steps (1) 45s (59 revs/min of mixing speed) is mixed in ash, then plus 29.05 parts of water stir at low speed 2min (64 turns of mixing speed/ Minute), it is slowly added into 0.57 part of water-reducing agent and 0.08 part of reinforcing agent again later, and accelerate to stir 1.5min (mixing speed 130 revs/min) afterwards obtain Uniform Flow substrate, initial flow degree be 260mm;;
(3), after step (2) obtains the substrate of Uniform Flow, using stirring at low speed 4min (58 revs/min of mixing speed), Period is slowly added to 1.46 parts of chemical synthetic fiber by hand to ensure that fiber can be uniformly distributed without there is clustering phenomena, fine Dimension adds in 2min;Regeneration ECC is obtained after the completion of stirring at low speed.
Obtained regeneration ECC is conserved in standard curing room to 28 days, 28 days compression strength is 54MPa, axle center tension is strong Degree be 5.3MPa, limit elongation 3.1%, 138 μm of average crack width, average crack number 23.
Examples detailed above is technical conception and technical characteristics to illustrate the invention, can not be limited with this of the invention Protection scope.The equivalent transformation or modification that all essence according to the present invention is done, should all cover in protection scope of the present invention Within.

Claims (8)

1. a kind of regeneration ECC being prepared using waste concrete fine powder, which is characterized in that by the group lease making of following parts by weight It is broken, obtain after stirring: 15~40 parts of cement, 10~40 parts of waste concrete fine powder, 10~60 parts of flyash, 20 ~40 parts of water, 0.2~2 part of water-reducing agent, 0.01~0.5 part of reinforcing agent and 1~4 part of chemical synthetic fiber.
2. regeneration ECC according to claim 1, which is characterized in that the cement is ordinary portland cement 42.5.
3. regeneration ECC according to claim 1, which is characterized in that the waste concrete fine powder is torn open for existing building Except the powder that the waste concrete generated in the process obtains after broken and sieve, specific surface area is 400~600m2/kg。
4. regeneration ECC according to claim 1, which is characterized in that the flyash, be I grades, II grade of flyash, than Surface area is 500~850m2/kg。
5. regeneration ECC according to claim 1, which is characterized in that the water-reducing agent, including but not limited to naphthalene system diminishing Agent, aminosulfonic water-reducing agent, melamine system water reducer, polycarboxylate high performance water-reducing agent.
6. regeneration ECC according to claim 1, which is characterized in that the reinforcing agent, including but not limited to alcamines, Alcohols, carbohydrate, Sulfates, chloride salt reinforcing agent.
7. regeneration ECC according to claim 1, which is characterized in that the chemical synthetic fiber is that polyvinyl alcohol is fine Dimension;20 μm~50 μm of fibre diameter, fibre length is 5mm~25mm.
8. a kind of preparation method of the described in any item regeneration ECC of claim 1-7, which comprises the following steps:
It (1), be specific surface area by the waste concrete crushing and grinding generated in existing building demolishing process is 400~600m2/ kg's Powder takes sieve bottom to obtain waste concrete fine powder, for use after screening;
(2), waste concrete fine powder, 10~60 parts of the flyash for obtaining 15~40 parts of cement, 10~40 parts of steps (1) 30s is stirred with 58~65 revs/min of speed after mixing;Then plus 20~40 parts of water is stirred with 62~67 revs/min of low speed Mix 2min;It is slowly added into 0.2~2 part of water-reducing agent and 0.01~0.5 part of reinforcing agent, and again later with 115~135 revs/min The substrate of Uniform Flow is obtained after the acceleration stirring 1.5min of clock;After the completion of stirring, the substrate of Uniform Flow, initial flow are obtained Degree is 200~400mm;
(3), it is during which manual using 57~63 revs/min of the 3min that stirs at low speed after step (2) obtains the substrate of Uniform Flow 1~4 part of chemical synthetic fiber is slowly added to ensure that fiber can be uniformly distributed without there is clustering phenomena, fiber is in 2min It inside adds, regeneration ECC is obtained after the completion of stirring at low speed.
CN201811266129.1A 2018-10-29 2018-10-29 A method of regeneration ECC is prepared using waste concrete fine powder Pending CN109231923A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111018437A (en) * 2019-12-10 2020-04-17 郑州大学 Ultrahigh-toughness waste brick-concrete regeneration mixture and preparation method and application thereof
CN113501697A (en) * 2021-08-09 2021-10-15 苏州东木轩装饰材料有限公司 Environment-friendly building material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103664090A (en) * 2013-12-19 2014-03-26 中国中材国际工程股份有限公司 Fiber-hybrid high-ductility cement-based composite material and preparation method thereof
CN104211358A (en) * 2014-09-11 2014-12-17 中国中材国际工程股份有限公司 Rapid-hardening early strength high-ductility cement-based composite material and preparation method thereof
CN104211344A (en) * 2014-09-11 2014-12-17 中国中材国际工程股份有限公司 Low-heat and high-ductility cement-based composite material and preparation method thereof
CN107382183A (en) * 2017-06-29 2017-11-24 昆明理工大学 A kind of high tenacity cement-base composite material
CN107954656A (en) * 2017-11-01 2018-04-24 同济大学 A kind of regenerative micro powder concrete with superelevation ductility and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103664090A (en) * 2013-12-19 2014-03-26 中国中材国际工程股份有限公司 Fiber-hybrid high-ductility cement-based composite material and preparation method thereof
CN104211358A (en) * 2014-09-11 2014-12-17 中国中材国际工程股份有限公司 Rapid-hardening early strength high-ductility cement-based composite material and preparation method thereof
CN104211344A (en) * 2014-09-11 2014-12-17 中国中材国际工程股份有限公司 Low-heat and high-ductility cement-based composite material and preparation method thereof
CN107382183A (en) * 2017-06-29 2017-11-24 昆明理工大学 A kind of high tenacity cement-base composite material
CN107954656A (en) * 2017-11-01 2018-04-24 同济大学 A kind of regenerative micro powder concrete with superelevation ductility and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111018437A (en) * 2019-12-10 2020-04-17 郑州大学 Ultrahigh-toughness waste brick-concrete regeneration mixture and preparation method and application thereof
CN113501697A (en) * 2021-08-09 2021-10-15 苏州东木轩装饰材料有限公司 Environment-friendly building material

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