CN106746828B - A method of recycled aggregate of waste concrete quality is improved using sodium carbonate liquor - Google Patents
A method of recycled aggregate of waste concrete quality is improved using sodium carbonate liquor Download PDFInfo
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- CN106746828B CN106746828B CN201710010526.1A CN201710010526A CN106746828B CN 106746828 B CN106746828 B CN 106746828B CN 201710010526 A CN201710010526 A CN 201710010526A CN 106746828 B CN106746828 B CN 106746828B
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- concrete
- recycled
- aggregate
- recycled aggregate
- sodium carbonate
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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
- 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
Abstract
The invention discloses a kind of method for improving recycled aggregate of waste concrete quality using sodium carbonate liquor, the Na for being 4 ~ 8% using mass concentration2CO3Aqueous solution soaking granular-grade is 5-20 mm recycled aggregate of waste concrete, and impregnating repair time is 15 ~ 25 days.The beneficial effects of the present invention are: making the water absorption rate of recycled aggregate reduces, apparent density increases, make the larger raising of the quality of recycled aggregate, recycled concrete coarse aggregate after sodium carbonate liquor is repaired, reach III grade standard of national standard GB/T25177-2010 concrete regenerated coarse aggregate in water absorption rate and apparent density, it can be used for preparing new concrete, solve the handling problems of discarded concrete building waste.
Description
Technical field
Field is utilized the invention belongs to construction refuse regenerated, and in particular to a kind of to improve discarded coagulation using sodium carbonate liquor
Native recycled aggregate quality method.
Background technique
Currently, building concrete rubbish accounts for about the 40% of building waste, quantity is very huge, but can be used again
Quantity is seldom.The main part of discarded concrete powder is sent to landfill yard landfill, and a large amount of soils can not only be occupied by filling,
It can also be to soil and air born pollution.The perfect condition of discarded concrete regeneration is can to prepare the regeneration of high quality
Aggregate.But the method for handling discarded concrete at present mainly includes basic technologies such as " broken, screening and removing impurity ", preparation
For recycled aggregate out due to containing Behavior of Hardened Cement Paste, porosity is high, and water absorption rate is high, and apparent density is low, so as to cause regeneration concrete
Performance declined.Currently, studies in China person mostly uses added material of different nature (such as polymer, organic silicon water-proofing
Agent mixes outside cement and mixes level-one flyash etc. outside Kim powder, cement) these materials have adhesivity, by being soaked to recycled aggregate
The processing such as stain, elution, drying, coats recycled aggregate appearance, however above method does not change the internal structure of recycled aggregate,
The property strengthened is not high, and is easy to fall off.
Summary of the invention
The object of the present invention is to provide a kind of methods for improving recycled aggregate of waste concrete quality using sodium carbonate liquor.
Calcium carbonate is generated since sodium carbonate liquor can react with calcium hydroxide in discarded concrete Behavior of Hardened Cement Paste, plugging cement stone
Hole and crack, to improve the performance of discarded concrete aggregate.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A method of recycled aggregate of waste concrete quality is improved using sodium carbonate liquor, comprising the following steps:
The Na for being 4~8% using mass concentration2CO3Aqueous solution soaking granular-grade is 5-20mm discarded concrete Regenerated Bone
Material, impregnating repair time is 15~25 days.
The green bone material type in recycled aggregate of waste concrete is not particularly limited in the present invention, from utilization efficiency and
For effect, it is preferred that the green bone material in the recycled aggregate of waste concrete is natural pebble.
There are many type for building aggregate, including gravel, rubble and cobble etc., and different aggregates has different building stones features.
In the processing of building waste, need to be handled respectively according to the classification situation of aggregate, processing method of the invention preferably selects 5-
The recycled aggregate of waste concrete of 20mm, wherein green bone material be natural pebble, verification experimental verification, when green bone material be natural pebble when,
When partial size is 5-20mm, the maximum value and optimal effectiveness of this method can be played.
Preferably, the Na2CO3The mass concentration of aqueous solution is 6%.In the present invention, it finds after study,
Na2CO3The mass concentration of aqueous solution has an important influence the water absorption rate and apparent density of recycled aggregate, works as Na2CO3Aqueous solution
Mass concentration when being 6%, the water absorption rate of recycled aggregate and apparent density effect can be made comprehensive best, prominent significant.Through trying
Test the study found that when mass concentration be greater than 6% when, although allowing the water absorption rate of recycled aggregate to reduce to the greatest extent,
It is that apparent density also decreases, such case may be related with sample self property；When mass concentration is less than 6%, regeneration
The water absorption rate of aggregate is larger, and apparent density is relatively low.From the point of view of the water absorption rate of its comprehensive recycled aggregate and the effect of apparent density,
It is optimal to be selected as 6%.
Preferably, the immersion repair time is 20 days.It finds after study, the present invention uses Na2CO3Aqueous solution into
When row recycled aggregate is repaired, soaking time has larger impact to the water absorption rate and apparent density of recycled aggregate, works as soaking time
When longer, more than 20 days, the water absorption rate of recycled aggregate will not reduce had the tendency that increase instead, this is because impregnating for a long time anti-
The Ca excessively generated should be may cause2CO3Behavior of Hardened Cement Paste is destroyed herein, if long soaking time, after destroying blocking hole
The structure of Behavior of Hardened Cement Paste, when soaking time is shorter, the water absorption rate of recycled aggregate is higher and apparent density is smaller.Comprehensive recycled aggregate
Water absorption rate and apparent density effect from the point of view of, it is optimal to be selected as 20 days.
The present invention also provides a kind of recycled concrete coarse aggregates being prepared using the above method.By above method system
Standby obtained regenerated coarse aggregate, water absorption rate and apparent density reach national standard GB/T25177-2010 concrete regenerated coarse aggregate III
Grade standard.
Specifically, the water absorption rate of the recycled concrete coarse aggregate is less than or equal to 5.10%；The regeneration concrete is thick
The apparent density of aggregate is more than or equal to 2.31g/cm3。
It is had the following beneficial effects: in above-mentioned technical proposal
(1) Na is utilized2CO3Solution is to repair liquid to repair recycled aggregate of waste concrete, improves its apparent density, reduces and inhale
Water rate, water absorption rate and apparent density reach III grade standard of national standard GB/T25177-2010 concrete regenerated coarse aggregate, can be used for
New concrete is prepared, not only can solve the handling problems of building waste in this way, but also can regenerate to make building waste obtain high quality
It recycles and a kind of thinking is provided.
(2) recycled aggregate of waste concrete is repaired using sodium carbonate liquor in the present invention, in addition to improving discarded concrete again
Outside the quality of raw aggregate, because sodium carbonate is alkalescent, it can also be mixed for the regeneration prepared using these recycled aggregates after repairing
Reinforcing bar in solidifying soil provides anti-corrosion protection.
(3) compared to other methods intensifying regenerating aggregate, production cost is reduced, and recycled aggregate can be made to obtain extensively
General utilization solves a large amount of difficult negative effects to environment caused with it of concrete debris processing, while saving big
The processing cost of the rubbish of amount produces huge social benefit and environmental benefit.
(4) it may be recovered, continue with using the aqueous sodium carbonate after the method for the present invention, it is mixed to reduce intensifying regenerating
The cost of solidifying soil aggregate.
Specific embodiment
Below with reference to embodiment, the present invention is further described.
Sodium carbonate liquor adds water to configure by sodium carbonate technical pure, and wherein powdered sodium carbonate is commercially available, and water is tap water；
Recycled aggregate of waste concrete is derived from the green sail construction material regeneration company in Qingdao, granulometric range 5-20mm,
Green bone material is natural pebble, has carried out removal of impurities and drying and processing to recycled aggregate of waste concrete before test.
Embodiment 1 repairs recycled aggregate of waste concrete using the sodium carbonate liquor that mass concentration is 6%
It is soaking in sodium carbonate solution recycled aggregate of waste concrete 10,20 and 30 days of 6% using mass concentration, according still further to
Relevant criterion requires to have detected water absorption rate, the apparent density of recycled aggregate of waste concrete.
Embodiment 2
A method of recycled aggregate of waste concrete quality is improved using sodium carbonate liquor, comprising the following steps:
The Na for being 4% using mass concentration2CO3Aqueous solution soaking recycled aggregate of waste concrete, impregnating repair time is 25
It.
Through detecting, 4% Na is utilized2CO3After aqueous solution impregnates recycled aggregate of waste concrete, and do not utilize
The recycled aggregate of sodium carbonate liquor processing is compared, and water absorption rate is substantially reduced, and apparent density significantly improves.
Embodiment 3
A method of recycled aggregate of waste concrete quality is improved using sodium carbonate liquor, comprising the following steps:
The Na for being 8% using mass concentration2CO3Aqueous solution soaking recycled aggregate of waste concrete, impregnating repair time is 15
It.
Through detecting, 8% Na is utilized2CO3After aqueous solution impregnates recycled aggregate of waste concrete, and do not utilize
The recycled aggregate of sodium carbonate liquor processing is compared, and water absorption rate is substantially reduced, and apparent density significantly improves.
Comparative example 1: repair process is not carried out using sodium carbonate
Water absorption rate, the apparent density of recycled aggregate of waste concrete are had detected according to relevant criterion requirement.
Comparative example 2: recycled aggregate of waste concrete is repaired using the sodium carbonate liquor that mass concentration is 2%
It is soaking in sodium carbonate solution recycled aggregate of waste concrete 10,20 and 30 days of 2% using mass concentration, according still further to
Relevant criterion requires to have detected water absorption rate, the apparent density of recycled aggregate of waste concrete.
Comparative example 3: recycled aggregate of waste concrete is repaired using the sodium carbonate liquor that mass concentration is 10%
Using soaking in sodium carbonate solution recycled aggregate of waste concrete 10,20 and 30 days that mass concentration is 10%, then press
Photograph closes standard requirements and has detected the water absorption rate of recycled aggregate of waste concrete, apparent density.
Shown in water absorption rate, apparent density result table 1 measured by embodiment 1, the comparative example 1~3.
1 water absorption rate of table, apparent density comparison
It can be obtained by table 1, after being impregnated using sodium carbonate liquor to recycled aggregate of waste concrete in the present invention, water suction
Rate reduces in various degree, and apparent density improves in various degree, and comprehensive tested evidence is carried out 20 days using 6% sodium carbonate liquor
The quality of recycled aggregate of waste concrete after immersion is repaired best.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (8)
1. a kind of method for improving recycled aggregate of waste concrete quality using sodium carbonate liquor, characterized in that including following step
It is rapid:
The Na for being 6% using mass concentration2CO3Aqueous solution soaking granular-grade is 5-20mm recycled aggregate of waste concrete, and immersion is repaired
The multiple time is 15~25 days；
Wherein, the green bone material in the recycled aggregate of waste concrete is natural pebble.
2. the method as described in claim 1, it is characterized in that: the immersion repair time is 20 days.
3. the method as described in claim 1, it is characterized in that: the recycled aggregate of waste concrete is after treatment, water absorption rate
Drop to 5.10% by 6.96%.
4. the method as described in claim 1, it is characterized in that: the recycled aggregate of waste concrete is after treatment, it is apparent close
Degree is by 1.98g/cm3It is increased to 2.31g/cm3。
5. the recycled concrete coarse aggregate being prepared using method according to any one of claims 1 to 4.
6. recycled concrete coarse aggregate as claimed in claim 5, it is characterized in that: the recycled concrete coarse aggregate water absorption rate and
Apparent density reaches III grade standard of national standard GB/T25177-2010 concrete regenerated coarse aggregate.
7. recycled concrete coarse aggregate as claimed in claim 5, it is characterized in that: the water absorption rate of the recycled concrete coarse aggregate
For less than or equal to 5.10%.
8. recycled concrete coarse aggregate as claimed in claim 5, it is characterized in that: the recycled concrete coarse aggregate is apparent close
Degree is more than or equal to 2.31g/cm3。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11773031B2 (en) | 2013-06-25 | 2023-10-03 | Carboncure Technologies Inc. | Apparatus for delivery of a predetermined amount of solid and gaseous carbon dioxide |
| US11878948B2 (en) | 2014-04-07 | 2024-01-23 | Carboncure Technologies Inc. | Integrated carbon dioxide capture |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10927042B2 (en) | 2013-06-25 | 2021-02-23 | Carboncure Technologies, Inc. | Methods and compositions for concrete production |
| CA3019860A1 (en) | 2016-04-11 | 2017-10-19 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
| CA3138622A1 (en) * | 2019-04-26 | 2020-10-29 | Carboncure Technologies Inc. | Carbonation of concrete aggregates |
| CN110510947B (en) * | 2019-08-29 | 2021-10-01 | 江苏苏博特新材料股份有限公司 | Method for preparing high-doping-amount low-quality ore-doped regenerated cement-based product through microwave curing |
| CN110922079A (en) * | 2019-11-13 | 2020-03-27 | 西安理工大学 | Method for reinforcing quality of recycled coarse aggregate by using sulfate solution |
| CN112125550B (en) * | 2020-08-14 | 2022-03-01 | 河南理工大学 | Method for reinforcing recycled aggregate of waste concrete through open carbonization |
| CN112897918A (en) * | 2021-03-26 | 2021-06-04 | 陕西思远能源科技有限公司 | Recycled aggregate strengthening liquid and preparation method thereof |
| CN113354362A (en) * | 2021-06-26 | 2021-09-07 | 苏州建国建筑工业有限公司 | Recycled concrete, recycled concrete prefabricated part and preparation method thereof |
| CN113968686B (en) * | 2021-10-30 | 2022-10-04 | 深圳市正强混凝土有限公司 | Regeneration method of waste concrete and modified regenerated concrete |
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| US11773031B2 (en) | 2013-06-25 | 2023-10-03 | Carboncure Technologies Inc. | Apparatus for delivery of a predetermined amount of solid and gaseous carbon dioxide |
| US11878948B2 (en) | 2014-04-07 | 2024-01-23 | Carboncure Technologies Inc. | Integrated carbon dioxide capture |
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| CN106746828A (en) | 2017-05-31 |
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