CN101767960A - Recycled concrete coarse aggregate modified processing method - Google Patents
Recycled concrete coarse aggregate modified processing method Download PDFInfo
- Publication number
- CN101767960A CN101767960A CN200810230324A CN200810230324A CN101767960A CN 101767960 A CN101767960 A CN 101767960A CN 200810230324 A CN200810230324 A CN 200810230324A CN 200810230324 A CN200810230324 A CN 200810230324A CN 101767960 A CN101767960 A CN 101767960A
- Authority
- CN
- China
- Prior art keywords
- coarse aggregate
- cement
- aggregate
- water
- processing method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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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
- 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
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
-
- 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
- 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)
- Inorganic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention relates to building material and in particular to a recycled concrete coarse aggregate modified processing method; water reducing agents with weight of 0.1-0.6 percent of cement is added in cement and is uniformly mixed, and then the recycled coarse aggregate is added under the coition that the cement paste is stirred uniformly and is uniformly mixed with the cement paste and is soaked for 20-40minues, and then maintaining is carried out. The crushing index of the modified coarse aggregate is obviously improved, and the measured value can reach specified requirements of standards of regular concrete sand, stone quality and test method (JGJ 52-2006), the water absorption rate is obviously reduced compared with the water absorption rate of the existing recycled coarse aggregate; in addition, the invention improves the stacking density of the recycled aggregate and well improves the aggregate gradation.
Description
Technical field
The present invention relates to material of construction, a kind of specifically recycled concrete coarse aggregate modified processing method.
Background technology
In the last thirty years, along with the quickening of urbanization process in the world wide, concrete is as the discussion that takies and the negative impact that environment causes has also been caused sustainable development to natural resources of the artificial material of maximum.At present, the concrete year output in the whole world about 28 * 10
8Mm
3The concrete annual production of China accounts for 45% of world's total amount, has reached 13 * 10
8～14 * 10
8Mm
3, estimate to surpass 22 * 10 in 2010
8Mm
3In concrete raw material, thickness is gathered materials and is accounted for 75% of concrete total amount.Calculate in view of the above: the whole world needs thickness to gather materials about 21 * 10 every year
8Mm
3, wherein China needs 10 * 10 approximately
8Mm
3, may surpass 16 * 10 after 5 years
8Mm
3Like this big consumption, primary one day coarse aggregate will get totally, therefore from the angle of resource reasonable development use and Sustainable development, it is extremely important to seek primary substitute of gathering materials.And this up-to-date production and operation mode of regenerated aggregate concrete (Recycled Aggregate Concrete) positive adaptation develops.
China we can say that to regeneration concrete research starting workload late, research is few, at present mainly the fundamental property of regeneration aggregate and regeneration concrete is carried out research and analysis, wherein aggregate has existing of microfracture this crack may be present in the inside of aggregate or outside extend to inner perforation seam in its shattering process of regenerated coarse aggregate, and a kind of phenomenon of stress concentration is caused in this crack.Water-intake rate is big because regeneration aggregate surface opening hole is many, and open pore is caused by aggregate surface sand-cement slurry and crack simultaneously, and the regeneration aggregate water-intake rate greatly directly has influence on mix proportion.In addition, the low grating that has influence on aggregate of tap density.If the regeneration concrete performance does not reach code requirement as can be known by analysis, will directly have influence on the regeneration concrete Application feasibility.
Summary of the invention
The invention provides a kind of recycled concrete coarse aggregate modified processing method that meets national regulation, is applicable to modern project.
For achieving the above object, the technical solution used in the present invention is:
Recycled concrete coarse aggregate modified processing method, it is characterized in that: the 0.1%-0.6% adding of water reducer by cement weight wherein mixed, then add regenerated coarse aggregate under the condition that grout stirs, itself and grout mixing were soaked 20-40 minute, maintenance gets final product then.Regulate its water cement ratio before adding water reducer in the described cement, water cement ratio is 0.36-0.46.Described regenerated coarse aggregate be by with castoff concrete through pulverizing, the screening particle diameter is the particle of 5-20mm.Described soaked regenerated coarse aggregate divides it in batches to be poured out, the last layer fine sand that looses makes the regenerated coarse aggregate that is soaked with grout be difficult for condensing into the cement stone of large volume, treat after the grout sclerosis itself and sand to be sieved, and to soaked regenerated coarse aggregate water seasoning.
The advantage that the present invention had:
1. the present invention improves one's methods and the cement flocculent structure of the group of wrapping up in scatter the high-efficiency water-reducing agent of poly-carboxylic acid adding, because the water reducer molecular orientation must be arranged on the cement particle surface, hydrophobic group one end points to cement granules, hydrophilic group one end points to water, thereby make the cement granules that closes on scatter owing to being with like charges to repel each other, the water that cement group is wrapped discharges.Also improve simultaneously cement granules dispersity, increased the water yield of participating in hydrated reaction of cement, thereby make cement aquation more abundant.The incorporation of water reducer is different in addition can be to the effect difference of its immersion
2. its crush index of coarse aggregate after the modification of the present invention obviously improves, and records the requirement that its value reaches " regular concrete sand, stone quality and test method standard " (JGJ 52-2006) defined; Water-intake rate is compared himself water-intake rate and is obviously reduced with existing regeneration aggregate, the present invention has improved the tap density of regeneration aggregate in addition, better improves grading of aggregate.
3. adopt the concrete of the coarse aggregate preparation after the modification of the present invention, its ultimate compression strength significantly improves and satisfies the design requirements of c30 concrete.
Embodiment
Embodiment 1
Raw material standby:
Regenerated coarse aggregate derives from the removal discarded concrete, and after fragmentation, cleaning, classification, the size of choosing is 5～10mm.Cement is worker source board P.S32.5 Portland blast.
Modification processing method:
By water cement ratio 3 kinds of situation water transfer mud of 0.38,0.40,0.42, add high-efficiency water-reducing agent of poly-carboxylic acid with respect to cement quality 0.2%, pour into after earlier water reducer and water being mixed well and prepare against in the cement of making good use of, with both thorough mixing, the stirrer of then standby regenerated coarse aggregate being packed into mixes with the grout that is added with water reducer under stirring condition, and it is contacted with grout fully, soaked then 30-35 minute, and obtained the regenerated coarse aggregate that modification is handled.
The regenerated coarse aggregate that above-mentioned modification is handled filters out aggregate with the sieve of 5mm, and at the aggregate surface fine sand that looses, the fine sand purpose of loosing is to prevent to cohere between the aggregate formation cement stone again.When the packing set on coarse aggregate surface, fine-screen shaker is removed, put into the curing room maintenance afterwards.Aggregate profile after the immersion is as cobble, and aggregate surface is stained with a small amount of fine sand simultaneously.
The regenerated coarse aggregate that above-mentioned gained modification is handled carries out performance measurement:
1. crush index:
The regenerated coarse aggregate that above-mentioned modification is handled carries out the test of crush values index.Every part of 3 parts on sample getting 2kg is standby.Measure 3d, 7d, the 28d crush values index (referring to table 1 and table 2) of the present invention and existing regeneration aggregate respectively
The crush values index δ of the regenerated coarse aggregate that table 1 modification of the present invention is handled
α(%)
Existing regenerated coarse aggregate, its crush values index is 17.5%, can not satisfy according to " regular concrete sand, stone quality and test method standard " (JGJ 52-2006), the code requirement of the crush index of rubble; And aggregate 28d crush index value of the present invention has satisfied requirement in the standard.
Table 2 water cement ratio is 0.38 and 0.42 crush values index δ of the present invention
α(%)
As seen from Table 2: water cement ratio is 0.38 the soaked aggregate crush index of grout than water cement ratio is low 0.2 percentage point of 0.40 the soaked aggregate crush index of grout; Water cement ratio be 0.42 the soaked aggregate crush index of grout be higher than stipulate in the standard 16%.According to " regular concrete sand, stone quality and test method standard " (JGJ 52-2006), the crush index of rubble: when concrete strength grade during smaller or equal to C35, the crush values index of sedimentogeneous rock is smaller or equal to 16%.So at first in water cement ratio is 0.38 and 0.40 grout, choose.Consider that the optional water cement ratio of selecting in construction aspect is that 0.40 grout soaks aggregate.
2. water-intake rate:
The regenerated coarse aggregate that modification in the foregoing description is handled is compared with existing regenerated coarse aggregate, and the undressed regenerated coarse aggregate water-intake rate in existing broken back is very big, and it directly has influence on the proportioning of regeneration concrete.The aggregate water-intake rate that modification of the present invention is handled is 1.71%.As seen the aggregate water-intake rate after modification is handled has tangible reduction.
3. tap density
The regenerated coarse aggregate that modification in the foregoing description is handled is compared (referring to table 3) with existing regenerated coarse aggregate
Table 2 tap density (Kg/m
3)
Can have influence on the degree of compactness of regeneration concrete as can be known in this respect.Improved 7.5% by its tap density of regenerated coarse aggregate after the visible immersion of table, illustrated that the regenerated coarse aggregate of the unmodified relatively processing of grating of aggregate becomes quite a lot of, the quality of grading of aggregate also can have influence on the quality of concrete strength.
4. be 100% to make the ultimate compression strength that the concrete cubes piece of C30 is surveyed its 28d by the present invention by the regenerated coarse aggregate substitution rate:
The ultimate compression strength (MPa) of table 3 cubes piece 28d
The cubes piece that the regenerated coarse aggregate that modification is handled is made has reached the concrete design requirements of C30.
Embodiment 2
It is that C30 is above that regenerated coarse aggregate derives from removal discarded concrete model, and after fragmentation, cleaning, classification, the size of choosing is 10～20mm.
Cement is 325
#Model above 425
#, 525
#
Modification processing method:
With above-mentioned cement furnishing water cement ratio is 0.36, the molasses superplasticizer that then in regulating the cement of water cement ratio, adds its weight 0.6%, this water reducer belongs to retarding water reducer, help abundant immersion to regenerated coarse aggregate, with both thorough mixing, the stirrer of then standby regenerated coarse aggregate being packed into, under stirring condition be added with the cement mixing of water reducer, it is contacted with grout fully, soaked then 35-40 minute, get the regenerated coarse aggregate that modification is handled.
Embodiment 3
It is that C60 is above that regenerated coarse aggregate derives from removal discarded concrete model, and after fragmentation, cleaning, classification, the size of choosing is 10～20mm.
Cement is 425
#Model above 525
#
Modification processing method:
With above-mentioned cement furnishing water cement ratio is 0.46, the xylogen water reducer that then in regulating the cement of water cement ratio, adds its weight 0.4%, with both thorough mixing, the stirrer of then standby regenerated coarse aggregate being packed into, under stirring condition be added with the cement mixing of water reducer, it is contacted with grout fully, soaked then 20-30 minute, get the regenerated coarse aggregate that modification is handled.
Claims (4)
1. recycled concrete coarse aggregate modified processing method, it is characterized in that: the 0.1%-0.6% adding of water reducer by cement weight wherein mixed, then under the condition that grout stirs, add regenerated coarse aggregate, itself and grout mixing were soaked 20-40 minute, and maintenance gets final product then.
2. by the described recycled concrete coarse aggregate modified processing method of claim 1, it is characterized in that: regulate its water cement ratio before adding water reducer in the described cement, water cement ratio is 0.36-0.46.
3. by the described recycled concrete coarse aggregate modified processing method of claim 1, it is characterized in that: described regenerated coarse aggregate be by with castoff concrete through pulverizing, the screening particle diameter is the particle of 5-20mm.
4. by the described recycled concrete coarse aggregate modified processing method of claim 1, it is characterized in that: described soaked regenerated coarse aggregate divides it in batches to be poured out, the last layer fine sand that looses makes the regenerated coarse aggregate that is soaked with grout be difficult for condensing into the cement stone of large volume, treat after the grout sclerosis itself and sand to be sieved, and to soaked regenerated coarse aggregate water seasoning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810230324A CN101767960A (en) | 2008-12-29 | 2008-12-29 | Recycled concrete coarse aggregate modified processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810230324A CN101767960A (en) | 2008-12-29 | 2008-12-29 | Recycled concrete coarse aggregate modified processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101767960A true CN101767960A (en) | 2010-07-07 |
Family
ID=42501086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810230324A Pending CN101767960A (en) | 2008-12-29 | 2008-12-29 | Recycled concrete coarse aggregate modified processing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101767960A (en) |
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358687A (en) * | 2011-08-05 | 2012-02-22 | 哈尔滨工业大学深圳研究生院 | Method for preparing recycled concrete by using sucrose water reducer and recycled concrete |
| CN102584135A (en) * | 2012-01-17 | 2012-07-18 | 西安建筑科技大学 | Preparation method for multielement mixed regenerated fiber enhanced regenerated concrete |
| CN102584134A (en) * | 2012-01-17 | 2012-07-18 | 西安建筑科技大学 | Preparation method of composite reinforced regenerated concrete with regenerated fiber and active minerals |
| CN102584137A (en) * | 2012-01-17 | 2012-07-18 | 西安建筑科技大学 | Method for preparing multielement assorted-fibred reinforced recycled concrete with low elasticity modulus |
| CN102584136A (en) * | 2012-01-17 | 2012-07-18 | 西安建筑科技大学 | Preparation of recycled concrete through compound enhancement of low-elasticity-modulus modified coarse fibre and active mineral material |
| CN102757208A (en) * | 2012-07-20 | 2012-10-31 | 济南大学 | Size and method for treating recycled coarse aggregates |
| CN103708792A (en) * | 2013-12-01 | 2014-04-09 | 内蒙古大学 | Preparation method for water permeable concrete |
| CN104628282A (en) * | 2015-01-30 | 2015-05-20 | 淮安市建筑工程检测中心有限公司 | Recycled aggregate surface treating agent and use method thereof |
| CN104860562A (en) * | 2015-05-14 | 2015-08-26 | 河北科技大学 | Method for preparing waterproof thermal insulation type recycled aggregates |
| CN105948549A (en) * | 2016-04-26 | 2016-09-21 | 中国路桥工程有限责任公司 | Large-water-absorption-rate aggregate surface treatment agent |
| CN105985075A (en) * | 2015-02-28 | 2016-10-05 | 香港理工大学 | Recycling and reusing method of cement concrete waste |
| CN108892406A (en) * | 2018-07-03 | 2018-11-27 | 济南大学 | A kind of porous hollow lightweight aggregate and preparation method thereof |
| CN108947292A (en) * | 2018-07-13 | 2018-12-07 | 同济大学 | Reclaimed concrete aggregate preconditioning technique |
| CN109265038A (en) * | 2018-11-14 | 2019-01-25 | 河北建设股份集团有限公司 | A kind of modification regeneration coarse aggregate and its method for preparing regeneration concrete |
| CN109574529A (en) * | 2018-12-06 | 2019-04-05 | 上海建工集团股份有限公司 | A kind of functional form recycled aggregate and preparation method and application reducing regeneration concrete workability gradual loss |
| CN109759225A (en) * | 2019-02-25 | 2019-05-17 | 中建四局第一建筑工程有限公司 | A kind of Punching Borehole Cast-in-place Concrete Pile mud circular treatment constructing structure |
| CN110066152A (en) * | 2019-04-10 | 2019-07-30 | 江苏城工建设科技有限公司 | A kind of high resistivity regeneration concrete and preparation method thereof |
| CN110922080A (en) * | 2019-11-27 | 2020-03-27 | 长安大学 | Modified recycled coarse aggregate, permeable water-storing concrete and preparation method thereof |
| CN111662030A (en) * | 2020-05-20 | 2020-09-15 | 西安理工大学 | Method for improving quality of recycled fine aggregate by utilizing cane molasses |
| CN111875309A (en) * | 2020-06-22 | 2020-11-03 | 浙江二十冶建设有限公司 | Recycled concrete and preparation method and application thereof |
| CN111908817A (en) * | 2020-07-10 | 2020-11-10 | 武汉工程大学 | Preparation method of magnesium phosphate cement material modified recycled coarse aggregate, modified recycled coarse aggregate obtained by preparation method and application of modified recycled coarse aggregate |
| CN111943545A (en) * | 2020-07-29 | 2020-11-17 | 广东省水利水电科学研究院 | Artificial sand and preparation method thereof |
| CN112194398A (en) * | 2020-10-12 | 2021-01-08 | 北京联绿技术集团有限公司 | Preparation method of waste brick aggregate |
| CN112573881A (en) * | 2020-12-31 | 2021-03-30 | 陕西友邦新材料科技有限公司 | Coarse aggregate for lightweight concrete and preparation method thereof |
| CN114180892A (en) * | 2021-12-22 | 2022-03-15 | 宿迁和天下建材科技有限公司 | Energy-saving renewable concrete and preparation method thereof |
-
2008
- 2008-12-29 CN CN200810230324A patent/CN101767960A/en active Pending
Cited By (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358687A (en) * | 2011-08-05 | 2012-02-22 | 哈尔滨工业大学深圳研究生院 | Method for preparing recycled concrete by using sucrose water reducer and recycled concrete |
| CN102584135A (en) * | 2012-01-17 | 2012-07-18 | 西安建筑科技大学 | Preparation method for multielement mixed regenerated fiber enhanced regenerated concrete |
| CN102584134A (en) * | 2012-01-17 | 2012-07-18 | 西安建筑科技大学 | Preparation method of composite reinforced regenerated concrete with regenerated fiber and active minerals |
| CN102584137A (en) * | 2012-01-17 | 2012-07-18 | 西安建筑科技大学 | Method for preparing multielement assorted-fibred reinforced recycled concrete with low elasticity modulus |
| CN102584136A (en) * | 2012-01-17 | 2012-07-18 | 西安建筑科技大学 | Preparation of recycled concrete through compound enhancement of low-elasticity-modulus modified coarse fibre and active mineral material |
| CN102757208A (en) * | 2012-07-20 | 2012-10-31 | 济南大学 | Size and method for treating recycled coarse aggregates |
| CN103708792A (en) * | 2013-12-01 | 2014-04-09 | 内蒙古大学 | Preparation method for water permeable concrete |
| CN103708792B (en) * | 2013-12-01 | 2016-06-08 | 内蒙古大学 | A kind of manufacture method of permeable concrete |
| CN104628282B (en) * | 2015-01-30 | 2016-11-30 | 淮安市建筑工程检测中心有限公司 | A kind of regeneration aggregate surface conditioning agent and using method thereof |
| CN104628282A (en) * | 2015-01-30 | 2015-05-20 | 淮安市建筑工程检测中心有限公司 | Recycled aggregate surface treating agent and use method thereof |
| CN105985075B (en) * | 2015-02-28 | 2020-08-11 | 香港理工大学 | Recycling method of cement concrete waste |
| CN105985075A (en) * | 2015-02-28 | 2016-10-05 | 香港理工大学 | Recycling and reusing method of cement concrete waste |
| CN104860562A (en) * | 2015-05-14 | 2015-08-26 | 河北科技大学 | Method for preparing waterproof thermal insulation type recycled aggregates |
| CN104860562B (en) * | 2015-05-14 | 2016-11-16 | 河北科技大学 | A kind of preparation method of waterproof thermal-insulated type lightweight regeneration aggregate |
| CN105948549B (en) * | 2016-04-26 | 2017-10-24 | 中国路桥工程有限责任公司 | A kind of big water absorption rate aggregate surface inorganic agent |
| CN105948549A (en) * | 2016-04-26 | 2016-09-21 | 中国路桥工程有限责任公司 | Large-water-absorption-rate aggregate surface treatment agent |
| CN108892406A (en) * | 2018-07-03 | 2018-11-27 | 济南大学 | A kind of porous hollow lightweight aggregate and preparation method thereof |
| CN108892406B (en) * | 2018-07-03 | 2020-07-28 | 济南大学 | Porous hollow light aggregate and preparation method thereof |
| CN108947292A (en) * | 2018-07-13 | 2018-12-07 | 同济大学 | Reclaimed concrete aggregate preconditioning technique |
| CN109265038A (en) * | 2018-11-14 | 2019-01-25 | 河北建设股份集团有限公司 | A kind of modification regeneration coarse aggregate and its method for preparing regeneration concrete |
| CN109574529A (en) * | 2018-12-06 | 2019-04-05 | 上海建工集团股份有限公司 | A kind of functional form recycled aggregate and preparation method and application reducing regeneration concrete workability gradual loss |
| CN109759225B (en) * | 2019-02-25 | 2024-05-14 | 中建四局第一建设有限公司 | Construction structure is handled in bored concrete pile mud circulation that punches a hole |
| CN109759225A (en) * | 2019-02-25 | 2019-05-17 | 中建四局第一建筑工程有限公司 | A kind of Punching Borehole Cast-in-place Concrete Pile mud circular treatment constructing structure |
| CN110066152A (en) * | 2019-04-10 | 2019-07-30 | 江苏城工建设科技有限公司 | A kind of high resistivity regeneration concrete and preparation method thereof |
| CN110922080A (en) * | 2019-11-27 | 2020-03-27 | 长安大学 | Modified recycled coarse aggregate, permeable water-storing concrete and preparation method thereof |
| CN111662030A (en) * | 2020-05-20 | 2020-09-15 | 西安理工大学 | Method for improving quality of recycled fine aggregate by utilizing cane molasses |
| CN111875309A (en) * | 2020-06-22 | 2020-11-03 | 浙江二十冶建设有限公司 | Recycled concrete and preparation method and application thereof |
| CN111908817A (en) * | 2020-07-10 | 2020-11-10 | 武汉工程大学 | Preparation method of magnesium phosphate cement material modified recycled coarse aggregate, modified recycled coarse aggregate obtained by preparation method and application of modified recycled coarse aggregate |
| CN111943545A (en) * | 2020-07-29 | 2020-11-17 | 广东省水利水电科学研究院 | Artificial sand and preparation method thereof |
| CN112194398A (en) * | 2020-10-12 | 2021-01-08 | 北京联绿技术集团有限公司 | Preparation method of waste brick aggregate |
| CN112573881A (en) * | 2020-12-31 | 2021-03-30 | 陕西友邦新材料科技有限公司 | Coarse aggregate for lightweight concrete and preparation method thereof |
| CN114180892A (en) * | 2021-12-22 | 2022-03-15 | 宿迁和天下建材科技有限公司 | Energy-saving renewable concrete and preparation method thereof |
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