CN105884230A - Method for recovering and reinforcing concrete aggregate - Google Patents
Method for recovering and reinforcing concrete aggregate Download PDFInfo
- Publication number
- CN105884230A CN105884230A CN201610228144.1A CN201610228144A CN105884230A CN 105884230 A CN105884230 A CN 105884230A CN 201610228144 A CN201610228144 A CN 201610228144A CN 105884230 A CN105884230 A CN 105884230A
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- China
- Prior art keywords
- aggregate
- calcium
- concrete
- treatment
- calcium salt
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Classifications
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- 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
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for recovering and reinforcing concrete aggregate. According to the method, waste concrete discharged during cleaning of a stirring vehicle is scientifically and effectively utilized, and water for separating cement and sand is saved. When the content of carbonatable substances in recycled aggregate is increased during treatment of a calcium hydroxide solution or a calcium salt solution with the method, calcium carbonate formed after carbonization treatment effectively fills microcracks, the porosity of the recycled aggregate is effectively reduced, and the crushing value and the water absorption of the aggregate are further reduced.
Description
Technical field
The invention belongs to concrete material preparing technical field, be specifically related to a kind of recovery and the method for reinforcing concrete aggregate.
Background technology
Flourish along with Building Trade in China, concrete is widely used in various building.The equipment such as truck mixer, concrete mixing plant and concrete batching and mixing tower are required for when producing often being carried out maintenance, and produced a large amount of waste materials are all to topple over as remaining mud, cause significant wastage.
According to relevant statistics, China about discharges the discarded concrete of 35% in Structural Engineering to root, and remaining is bituminous concrete the like waste.According to rough Statistics, only China removes the rubbish of old building every year and just reaches more than 4,000 ten thousand tons, the generating capacity of the old concrete that wherein disintegrates about more than 1,360 ten thousand tons, additionally, China annual new cast concrete about 2 billion cubic meter, the discarded concrete discharged because of cause for quality the most up to 4,800,000 tons at present.
Discarded concrete is processed into regeneration aggregate be used for the preparation of regeneration concrete and not only solve problem of environmental pollution, also achieves resource reutilization, decrease the waste of resource and the energy.But compared with natural aggregate, there is a large amount of microcrack inside regeneration aggregate, crush index value is high, water absorption rate is big, its regeneration mortar prepared and the service behaviour of regeneration concrete, mechanical property is utilized also to be difficult to meet engine request with durability.Therefore, waste and old concrete in building waste, to improve regeneration mortar performance, is recycled and sustainable development is significant by intensifying regenerating fine aggregate.For improving the performance deficiency of regeneration aggregate, numerous scholars utilize distinct methods to improve regeneration aggregate surface texture, reduce micro-crack or hole, and as utilized polymer solution, water glass solution, organosilicon moisture repellent, and acid soak processes regeneration aggregate.Wherein the limited use of acid solution ablution but also acid ion can be introduced, the pH value of impact attachment mortar；Polymer treatment method can effectively reduce the water absorption rate of Aggregate of recycled concrete, but the raising to intensity is limited；Organosilicon moisture repellent and waterglass soak, and not only cost is high, and changes regeneration aggregate particle diameter and grating, make fine aggregate modulus of fineness beyond critical field.
Summary of the invention
The present invention provides a kind of and reclaims and the method for reinforcing concrete aggregate, and the aggregate using the method to obtain has environmental protection, cheap, intensity high.
To achieve these goals, the present invention provides a kind of and reclaims and the method for reinforcing concrete aggregate, and the method comprises the steps:
(1) concrete mixing plant cleans the waste concrete that agitating lorry discharged sieved by the ferrum that aperture is 10mm, after sifting out coarse aggregate therein, precipitate in waste concrete is concentrated on sedimentation tank, and clear water is entered clear water reserviors；
(2) with moisture content unnecessary in water absorber or absorbent material sucking-off waste concrete, stir further according to needing the fine grinding quicklime powder adding waste concrete 0.5wt%, when utilizing quick lime aquation, required this principle of a large amount of moisture content absorbs the excessive moisture in concrete further, quick lime addition, so that no longer there being unnecessary free water in aggregate, obtains regeneration aggregate；
(3) regeneration aggregate is processed
(31) aqua calcis or calcium salt add Calcium treatment process: take the recycled fine aggregate prepared by building waste and be laid in pallet, and rear sprinkling calcium hydroxide or calcium salt soln also stir；
(32)CO2Intensive treatment: being placed in airtight carbonization case by the recycled fine aggregate after aqua calcis or calcium salt add Calcium treatment, carbonization treatment is complete to surface carbonation；Regeneration aggregate after being processed.
Preferably, in step (31), the effect adding Calcium treatment depends on the dissolubility of calcium salt, with the higher calcium chloride of Selective dissolution degree or calcium nitrate；Recycled fine aggregate particle diameter is less than 4.75mm；Definition aqua calcis parameter C, C is the ratio that the amount of calcium hydroxide material used processes the quality of aggregate with it, and C value scope is 0.1mol/kg-0.25mol/kg；The solvent quality of calcium hydroxide or calcium salt soln is determined by the moisture content of regeneration aggregate during carbonization treatment, and regeneration aggregate moisture control is at 2.4%-7.5%.
Preferably, in step (32), controlling temperature during carbonization treatment is 25 DEG C-50 DEG C, relative humidity 35%-45% during carbonization treatment；CO during carbonization treatment2Volumetric concentration 45%-75%；The surface carbonation method of inspection completely is: tiling regeneration aggregate, sprays phenolphthalein reagent, and sample carbonization surface invariant color, sample part carbonization then reddens.
The methodological science of the present invention efficiently utilizes the waste concrete discharged when cleaning trucd mixer, save the use water separating cement and sandstone, when in the method for the present invention, aqua calcis or calcium salt soln process the carbonizable substance content in improving regeneration aggregate, after carbonization treatment, the calcium carbonate formed effectively fills micro-crack, and effectively reduce regeneration aggregate porosity, and then reduce aggregate crush values, reduce aggregate water absorption rate.
Detailed description of the invention
Embodiment one
Concrete mixing plant cleans the waste concrete that agitating lorry discharged sieved by the ferrum that aperture is 10mm, after sifting out coarse aggregate therein, precipitate in waste concrete is concentrated on sedimentation tank, and clear water is entered clear water reserviors.
With moisture content unnecessary in water absorber or absorbent material sucking-off waste concrete, stir further according to needing the fine grinding quicklime powder adding waste concrete 0.5wt%, when utilizing quick lime aquation, required this principle of a large amount of moisture content absorbs the excessive moisture in concrete further, quick lime addition, so that no longer there being unnecessary free water in aggregate, obtains regeneration aggregate.
Aqua calcis or calcium salt add Calcium treatment and process: take the recycled fine aggregate prepared by building waste and be laid in pallet, and rear sprinkling calcium hydroxide or calcium salt soln also stir.The effect adding Calcium treatment depends on the dissolubility of calcium salt, with the higher calcium chloride of Selective dissolution degree or calcium nitrate；Recycled fine aggregate particle diameter is less than 4.75mm；Definition aqua calcis parameter C, C is the ratio that the amount of calcium hydroxide material used processes the quality of aggregate with it, and C value scope is 0.25mol/kg；The solvent quality of calcium hydroxide or calcium salt soln is determined by the moisture content of regeneration aggregate during carbonization treatment, and regeneration aggregate moisture control is 7.5%.
CO2Intensive treatment: being placed in airtight carbonization case by the recycled fine aggregate after aqua calcis or calcium salt add Calcium treatment, carbonization treatment is complete to surface carbonation；Regeneration aggregate after being processed.
Controlling temperature during carbonization treatment is 50 DEG C, relative humidity 45% during carbonization treatment；CO during carbonization treatment2Volumetric concentration 75%；The surface carbonation method of inspection completely is: tiling regeneration aggregate, sprays phenolphthalein reagent, and sample carbonization surface invariant color, sample part carbonization then reddens.
Embodiment two
Concrete mixing plant cleans the waste concrete that agitating lorry discharged sieved by the ferrum that aperture is 10mm, after sifting out coarse aggregate therein, precipitate in waste concrete is concentrated on sedimentation tank, and clear water is entered clear water reserviors.
With moisture content unnecessary in water absorber or absorbent material sucking-off waste concrete, stir further according to needing the fine grinding quicklime powder adding waste concrete 0.5wt%, when utilizing quick lime aquation, required this principle of a large amount of moisture content absorbs the excessive moisture in concrete further, quick lime addition, so that no longer there being unnecessary free water in aggregate, obtains regeneration aggregate.
Aqua calcis or calcium salt add Calcium treatment and process: take the recycled fine aggregate prepared by building waste and be laid in pallet, and rear sprinkling calcium hydroxide or calcium salt soln also stir.The effect adding Calcium treatment depends on the dissolubility of calcium salt, with the higher calcium chloride of Selective dissolution degree or calcium nitrate；Recycled fine aggregate particle diameter is less than 4.75mm；Definition aqua calcis parameter C, C is the ratio that the amount of calcium hydroxide material used processes the quality of aggregate with it, and C value scope is 0.25mol/kg；The solvent quality of calcium hydroxide or calcium salt soln is determined by the moisture content of regeneration aggregate during carbonization treatment, and regeneration aggregate moisture control is 7.5%.
CO2Intensive treatment: being placed in airtight carbonization case by the recycled fine aggregate after aqua calcis or calcium salt add Calcium treatment, carbonization treatment is complete to surface carbonation；Regeneration aggregate after being processed.
Controlling temperature during carbonization treatment is 25 DEG C-50 DEG C, relative humidity 35%-45% during carbonization treatment；CO during carbonization treatment2Volumetric concentration 45%-75%；The surface carbonation method of inspection completely is: tiling regeneration aggregate, sprays phenolphthalein reagent, and sample carbonization surface invariant color, sample part carbonization then reddens.The present invention is described by embodiment; but do not limit the invention; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (3)
1. reclaiming and a method for reinforcing concrete aggregate, the method comprises the steps:
(1) concrete mixing plant cleans the waste concrete that agitating lorry discharged sieved by the ferrum that aperture is 10mm, after sifting out coarse aggregate therein, precipitate in waste concrete is concentrated on sedimentation tank, and clear water is entered clear water reserviors；
(2) with moisture content unnecessary in water absorber or absorbent material sucking-off waste concrete, stir further according to needing the fine grinding quicklime powder adding waste concrete 0.5wt%, when utilizing quick lime aquation, required this principle of a large amount of moisture content absorbs the excessive moisture in concrete further, quick lime addition, so that no longer there being unnecessary free water in aggregate, obtains regeneration aggregate；
(3) regeneration aggregate is processed
(31) aqua calcis or calcium salt add Calcium treatment process: take the recycled fine aggregate prepared by building waste and be laid in pallet, and rear sprinkling calcium hydroxide or calcium salt soln also stir；
(32)CO2Intensive treatment: being placed in airtight carbonization case by the recycled fine aggregate after aqua calcis or calcium salt add Calcium treatment, carbonization treatment is complete to surface carbonation；Regeneration aggregate after being processed.
2. the method for claim 1, it is characterised in that in step (31), the effect adding Calcium treatment depends on the dissolubility of calcium salt, with the higher calcium chloride of Selective dissolution degree or calcium nitrate；Recycled fine aggregate particle diameter is less than 4.75mm；Definition aqua calcis parameter C, C is the ratio that the amount of calcium hydroxide material used processes the quality of aggregate with it, and C value scope is 0.1mol/kg-0.25mol/kg；The solvent quality of calcium hydroxide or calcium salt soln is determined by the moisture content of regeneration aggregate during carbonization treatment, and regeneration aggregate moisture control is at 2.4%-7.5%.
3. the method for claim 1, it is characterised in that in step (32), controlling temperature during carbonization treatment is 25 DEG C-50 DEG C, relative humidity 35%-45% during carbonization treatment；CO during carbonization treatment2Volumetric concentration 45%-75%；The surface carbonation method of inspection completely is: tiling regeneration aggregate, sprays phenolphthalein reagent, and sample carbonization surface invariant color, sample part carbonization then reddens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610228144.1A CN105884230A (en) | 2016-04-13 | 2016-04-13 | Method for recovering and reinforcing concrete aggregate |
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| CN201610228144.1A CN105884230A (en) | 2016-04-13 | 2016-04-13 | Method for recovering and reinforcing concrete aggregate |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106746828A (en) * | 2017-01-06 | 2017-05-31 | 山东建筑大学 | A kind of method that utilization sodium carbonate liquor improves recycled aggregate of waste concrete quality |
| CN106830730A (en) * | 2017-01-06 | 2017-06-13 | 山东建筑大学 | A kind of method that utilization NaOH aqueous slkali improves recycled aggregate of waste concrete quality |
| CN107814502A (en) * | 2017-11-14 | 2018-03-20 | 中国矿业大学 | A kind of carbonizing plant of concrete solid waste regeneration aggregate |
| CN108609939A (en) * | 2018-07-23 | 2018-10-02 | 南京嘉怡装饰设计有限公司 | Impervious, cement mortar |
| CN108793797A (en) * | 2018-06-28 | 2018-11-13 | 湖南大学 | A kind of preparation method of the carbonization recycled aggregate of inhibition alkali-aggregate reaction |
| CN108879136A (en) * | 2018-07-23 | 2018-11-23 | 南京嘉怡装饰设计有限公司 | Toilet equipotential construction technology |
| CN109206037A (en) * | 2018-09-28 | 2019-01-15 | 镇江苏博特新材料有限公司 | The surface treatment method and cement base water-permeable brick surface layer of clay brick recycled fine aggregate |
| CN109320290A (en) * | 2018-11-02 | 2019-02-12 | 山西大学 | A kind of processing method of concrete prefabricated product enhancing carbon sequestration |
| CN109336156A (en) * | 2018-11-09 | 2019-02-15 | 山东大学 | A kind of apparatus and method gathered materials based on in-situ preparation calcium carbonate intensifying regenerating |
| CN111170687A (en) * | 2020-02-19 | 2020-05-19 | 广东派安建材有限公司 | Method for manufacturing recycled aggregate green concrete |
| CN115321860A (en) * | 2022-07-29 | 2022-11-11 | 中原环保万瑞郑州固废科技有限公司 | Construction waste recycled aggregate surface modification and particle reinforcement method |
| CN115321861A (en) * | 2022-08-10 | 2022-11-11 | 香港理工大学 | Method for absorbing carbon and fixing carbon by utilizing concrete porous aggregate and concrete |
| CN116730644A (en) * | 2023-04-23 | 2023-09-12 | 扬州大学 | Preparation method of bittern carbonization synergistic reinforcement recycled aggregate |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830730B (en) * | 2017-01-06 | 2019-05-14 | 山东建筑大学 | A method of recycled aggregate of waste concrete quality is improved using sodium hydroxide aqueous slkali |
| CN106830730A (en) * | 2017-01-06 | 2017-06-13 | 山东建筑大学 | A kind of method that utilization NaOH aqueous slkali improves recycled aggregate of waste concrete quality |
| CN106746828A (en) * | 2017-01-06 | 2017-05-31 | 山东建筑大学 | A kind of method that utilization sodium carbonate liquor improves recycled aggregate of waste concrete quality |
| CN106746828B (en) * | 2017-01-06 | 2019-05-14 | 山东建筑大学 | A method of recycled aggregate of waste concrete quality is improved using sodium carbonate liquor |
| CN107814502A (en) * | 2017-11-14 | 2018-03-20 | 中国矿业大学 | A kind of carbonizing plant of concrete solid waste regeneration aggregate |
| CN108793797A (en) * | 2018-06-28 | 2018-11-13 | 湖南大学 | A kind of preparation method of the carbonization recycled aggregate of inhibition alkali-aggregate reaction |
| CN108609939A (en) * | 2018-07-23 | 2018-10-02 | 南京嘉怡装饰设计有限公司 | Impervious, cement mortar |
| CN108879136A (en) * | 2018-07-23 | 2018-11-23 | 南京嘉怡装饰设计有限公司 | Toilet equipotential construction technology |
| CN109206037A (en) * | 2018-09-28 | 2019-01-15 | 镇江苏博特新材料有限公司 | The surface treatment method and cement base water-permeable brick surface layer of clay brick recycled fine aggregate |
| CN109320290A (en) * | 2018-11-02 | 2019-02-12 | 山西大学 | A kind of processing method of concrete prefabricated product enhancing carbon sequestration |
| CN109336156A (en) * | 2018-11-09 | 2019-02-15 | 山东大学 | A kind of apparatus and method gathered materials based on in-situ preparation calcium carbonate intensifying regenerating |
| CN111170687A (en) * | 2020-02-19 | 2020-05-19 | 广东派安建材有限公司 | Method for manufacturing recycled aggregate green concrete |
| CN115321860A (en) * | 2022-07-29 | 2022-11-11 | 中原环保万瑞郑州固废科技有限公司 | Construction waste recycled aggregate surface modification and particle reinforcement method |
| CN115321860B (en) * | 2022-07-29 | 2023-10-27 | 中原环保万瑞郑州固废科技有限公司 | Surface modification and particle reinforcement method for construction waste recycled aggregate |
| CN115321861A (en) * | 2022-08-10 | 2022-11-11 | 香港理工大学 | Method for absorbing carbon and fixing carbon by utilizing concrete porous aggregate and concrete |
| CN115321861B (en) * | 2022-08-10 | 2023-08-15 | 香港理工大学 | Method for absorbing and fixing carbon by utilizing concrete porous aggregate and concrete |
| CN116730644A (en) * | 2023-04-23 | 2023-09-12 | 扬州大学 | Preparation method of bittern carbonization synergistic reinforcement recycled aggregate |
| CN116730644B (en) * | 2023-04-23 | 2023-12-29 | 扬州大学 | Preparation method of bittern carbonization synergistic reinforcement recycled aggregate |
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Application publication date: 20160824 |