CN110105012A - A kind of high property spray concrete admixture specially - Google Patents
A kind of high property spray concrete admixture specially Download PDFInfo
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- CN110105012A CN110105012A CN201910371601.6A CN201910371601A CN110105012A CN 110105012 A CN110105012 A CN 110105012A CN 201910371601 A CN201910371601 A CN 201910371601A CN 110105012 A CN110105012 A CN 110105012A
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- admixture
- component
- concrete
- adhesive aggregation
- specially
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention belongs to construction engineering technical field, in particular to a kind of high property spray concrete admixture specially, the admixture specially includes two kinds of main components of adhesive aggregation component and accelerating component, and the mass ratio of adhesive aggregation component and accelerating component is 60 ~ 70:30 ~ 40.Wherein, adhesive aggregation group is divided into the mixture of modified latex powder and microfine mineral admixture, and the mass ratio of modified milk rubber powder and microfine mineral admixture is 20 ~ 30:70 ~ 80, and accelerating component is high activity tricalcium aluminate.The present invention is acted synergistically by adhesive aggregation component and accelerating component, effectively increases the cohesiveness and early strength of gunite concrete, to reduce rebound of shotcrete rate, improves density.The material will provide effective way for really realization gunite concrete high performance.
Description
Technical field
The invention belongs to architecture engineering material technical field, in particular to a kind of dedicated blending of high property spray concrete
Material.
Background technique
Gunite concrete is the important component of Tunnel Engineering, and workability and service state are to influence Tunnel Engineering
An important factor for construction speed and later period use state.Gunite concrete can be divided into dry spray and wet according to the difference of work progress
Spray two classes.Wherein, dry shotcreting is since work progress dust pollution is serious, it is larger to injure to construction personnel, at present compared with
It is few to use.The use of wet shot method then effectively reduces the dust pollution of course of injection, and rebound of shotcrete rate reduces, construction
Efficiency significantly improves.Therefore, wet shot method has become the main form of construction work of tunnel gunite concrete.But in wet shot coagulation
There are still outstanding problems such as rebound degree height, early strength deficiencies in native work progress, the above problem, which will significantly reduce, sprays coagulation
Native construction efficiency simultaneously causes the degradation phenomenas such as shrinkage cracking.On the other hand, traditional gunite concrete is in mix-design process
In only consider compression strength index request, without consider life requirement.The design concept, which also results in engineering practice, sprays
The outstanding problems such as concrete strength retraction, impervious difference.However, just branch gunite concrete is that protection path structure is steady safely in tunnel
Surely the crucial composition of the important barrier and tunnel support structure Force Calculation be on active service, therefore set in gunite concrete match ratio
Meter during only consider compression strength index be it is far from being enough, still need to further consider durability index.Of the present invention one
The it is proposed of kind high property spray concrete admixture specially, can effectively solve endurance issues existing for gunite concrete, make to spray
Concrete high-performance is penetrated to be possibly realized.The admixture specially main function includes: that (1) improves gunite concrete cohesiveness, drop
Low resilient rate improves a jet thickness；(2) gunite concrete early strength is improved, increases density, to effectively improve spray
Penetrate concrete durability.
Currently, researchers at home and abroad concrete admixture and durability in terms of have been achieved for it is certain into
Exhibition, but the still rare report of admixture specially for comprehensively considering construction of shotcrete performance and long durability.Chinese patent
CN102826774A " nanoscale gunite concrete modifying admixture " is dropped by using nano silica and mineral admixture
The rebound degree of low gunite concrete.But main component is nano silica in the invention modifying admixture, Zhan is total
The 70% ~ 95% of quality.Since nano silica cost of material is higher and is not obvious to concrete cohesiveness improvement, institute
Gunite concrete cement gross mass need to be accounted for the modifying admixture in the invention 10% ~ 15%.Just because of the material at
This higher and volume is larger, therefore promotes and applies more limited.Chinese patent CN1262254A be " high-activity concrete additive
Technology of preparing and method ", Chinese patent CN1792955A " a kind of high-activity concrete additive ", Chinese patent
CN101037310A " a kind of high-performance pumping concrete containing mineral admixture " etc. proposes mixed suitable for different operating conditions
Coagulate the admixture specially of soil.But for the high-performance that the special construction process of gunite concrete and life requirement are proposed
Concrete admixture is relatively fewer.
Summary of the invention
The purpose of the invention is to overcome that conventional spray concrete cohesiveness is poor, rebound degree is high, early strength is low etc. no
A kind of sufficient and proposition high property spray concrete admixture specially.
To achieve the above object, the technical solution adopted by the present invention is as follows.
The problems such as rebound degree is high, early strength is insufficient is solved by increasing gunite concrete cohesiveness and early strength,
A kind of high property spray concrete admixture specially i.e. of the present invention includes two kinds of core components: adhesive aggregation component and early strong group
Point.Wherein adhesive aggregation component is mixed by modified milk rubber powder and microfine mineral admixture, and modified milk rubber powder and fine mineral blend
Material mass ratio is 60 ~ 70:30 ~ 40.Wherein, accelerating component is made of high activity tricalcium aluminate.Adhesive aggregation component and accelerating component association
Same-action, can effectively improve the cohesiveness of gunite concrete, to reduce rebound of shotcrete rate, and by improving early stage
Intensity is effectively improved gunite concrete durability.
Specifically, a kind of high property spray concrete admixture specially includes following component.
Adhesive aggregation component (60% ~ 70%) includes two kinds of main components of modified milk rubber powder and mineral admixture, and modified milk rubber powder
Mass ratio with microfine mineral admixture is 20 ~ 30:70 ~ 80.The modified milk rubber powder is vinyl acetate in acetic acid existence condition
Under be polymerized, the degree of polymerization be 300 ~ 600.The microfine mineral admixture be one of silicon ash, ultrafine slag powder or its
Meaning scalemic thereof, and the fineness d50 of microfine mineral admixture is less than 5 μm.
Accelerating component (30% ~ 40%) main component is high activity tricalcium aluminate powder, and fineness d50 is less than 15 μm.
Admixture specially of the present invention and the mass ratio of gunite concrete cementitious material are 5 ~ 10:90 ~ 95.
Gunite concrete can be effectively reduced in a kind of use of high property spray concrete admixture specially of the present invention
Rebound degree improves a jet thickness, improves early strength.Specifically, the use of the admixture specially may be implemented to spray
Concrete sidewall rebound degree≤5%, vault≤8%, time jet thickness are more than or equal to 40cm, jet flow forming concrete 1d pressure resistance
Degree >=15MPa.
Specific embodiment
In order to better illustrate the present invention the characteristics of, is illustrated summary of the invention below in conjunction with specific embodiment, but this
Summary of the invention is not limited to the embodiment content.Gunite concrete mix process containing modifying admixture of the present invention includes: elder generation
Coarse aggregate, fine aggregate, cement and admixture specially are added in blender and stirred 2 minutes, water and other additives are then added
Go out machine after stirring 2 minutes.
Comparative example 1
It is tested using the gunite concrete for not mixing admixture specially of the present invention, as a comparison case.Rapid hardening in the test
Agent volume is the 7% of cementitious material gross mass, is added at nozzle.It is tested using wet spraying process, test section where this test
For III grade of country rock.
Testing raw material includes: Jinyu board P.O.42.5 cement；Common river sand, fineness modulus 2.7；Graded broken stone, grain
5 ~ 15mm of diameter；Water-reducing agent is the polycarboxylate water-reducer of Jiangsu company production；Accelerator is alkali-free liquid accelerator.
The gunite concrete match ratio for not mixing the admixture specially is as shown in the table.
| Ordinary portland cement | Flyash | Sand | Stone | Water | Water-reducing agent | Accelerator |
| 400 | 80 | 750 | 950 | 195 | 1.0% | 7% |
The presetting period of above-mentioned accelerator volume cement is 2min35s, final setting time 5min23s.Dedicated mix is being not added
When closing material, abutment wall rebound degree is 11% during above-mentioned concrete ejection, and vault rebound degree is 18%.Pass through unbearable sampling, injection
Concrete 1d compression strength is 8.9MPa.
Embodiment 1
The mass fraction of gunite concrete admixture specially each component is respectively as follows:
21 parts of modified milk rubber powder；24.5 parts of silicon ash, 24.5 parts of super finely ground slag；30 parts of high activity tricalcium aluminate.
High property spray concrete admixture specially volume is the 5% of gel material content, and accelerator volume is in the test
The 7% of cementitious material gross mass adds at nozzle.Mix the gunite concrete match ratio such as following table institute of the admixture specially
Show.
| Ordinary portland cement | Admixture specially | Flyash | Sand | Stone | Water | Water-reducing agent | Accelerator |
| 370 | 22.5 | 80 | 750 | 950 | 195 | 1.0% | 7% |
After admixture specially is added, abutment wall rebound degree is 3% during above-mentioned concrete ejection, and vault rebound degree is 5%.
By unbearable sampling, gunite concrete 1d compression strength is 18.1MPa.
Embodiment 2
The mass fraction of gunite concrete admixture specially each component is respectively as follows:
21 parts of modified milk rubber powder；24.5 parts of silicon ash, 24.5 parts of super finely ground slag；30 parts of high activity tricalcium aluminate.
High property spray concrete admixture specially volume is the 10% of cement consumption, and accelerator volume is glue in the test
The 7% of gel material gross mass adds at nozzle.The gunite concrete match ratio for mixing the admixture specially is as shown in the table.
| Ordinary portland cement | Admixture specially | Flyash | Sand | Stone | Water | Water-reducing agent | Accelerator |
| 360 | 44 | 80 | 750 | 950 | 195 | 1.0% | 7% |
After admixture specially is added, abutment wall rebound degree is 1% during above-mentioned concrete ejection, and vault rebound degree is 3%.
By unbearable sampling, gunite concrete 1d compression strength is 20.9MPa.
From above-mentioned test result: the gunite concrete admixture specially component used in embodiment 1 ~ 2 is identical, but mixes
Enter amount difference.By being compareed with comparative example 1 it is found that the use of admixture specially can effectively improve the cohesiveness of gunite concrete,
To reduce the rebound degree of abutment wall and vault, and accelerating component can effectively improve gunite concrete 1d pressure resistance in admixture specially
Degree.By the test result of comparative example 1 and 2 it is found that with the admixture specially volume raising, gunite concrete adhesive aggregation
Property increase, rebound degree further decreases, and 1d compression strength significantly improves.According to above-mentioned test result, by the present invention in that with
Adhesive aggregation component and accelerating component synergistic effect successful formulation go out high property spray concrete admixture specially, the use of the admixture
Gunite concrete cohesiveness can be effectively improved, rebound degree is reduced, improves early strength, improves gunite concrete durability.
Claims (4)
1. a kind of high property spray concrete admixture specially, which is characterized in that the admixture includes adhesive aggregation component and early strong group
It is divided to two kinds of main components, wherein the mass ratio of adhesive aggregation component and accelerating component is 60 ~ 70:30 ~ 40, and the adhesive aggregation group is divided into modification
The mixture of latex powder and microfine mineral admixture, wherein the mass ratio of modified milk rubber powder and microfine mineral admixture is 20 ~ 30:
70 ~ 80, the accelerating component is high activity tricalcium aluminate.
2. a kind of high property spray concrete admixture specially according to claim 1, which is characterized in that the modified milk
Rubber powder is that vinyl acetate is polymerized under acetic acid existence condition, and the degree of polymerization is 300 ~ 600.
3. a kind of high property spray concrete admixture specially according to claim 1, which is characterized in that the ultra-fine mine
Polymer blends material is one of silicon ash, ultrafine slag powder or its arbitrary proportion mixture, and the fineness d50 of microfine mineral admixture
Less than 5 μm.
4. a kind of high property spray concrete admixture specially according to claim 1, which is characterized in that described dedicated to mix
The mass ratio for closing material and gunite concrete cementitious material is 5 ~ 10:90 ~ 95.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910371601.6A CN110105012B (en) | 2019-05-06 | 2019-05-06 | High-performance admixture special for sprayed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910371601.6A CN110105012B (en) | 2019-05-06 | 2019-05-06 | High-performance admixture special for sprayed concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110105012A true CN110105012A (en) | 2019-08-09 |
| CN110105012B CN110105012B (en) | 2022-07-22 |
Family
ID=67488324
Family Applications (1)
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| CN201910371601.6A Active CN110105012B (en) | 2019-05-06 | 2019-05-06 | High-performance admixture special for sprayed concrete |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456851A (en) * | 2020-11-07 | 2021-03-09 | 江苏博拓新型建筑材料股份有限公司 | Water-reducing early strength mineral admixture and preparation method thereof |
| CN114477843A (en) * | 2022-01-27 | 2022-05-13 | 武汉源锦建材科技有限公司 | Heat-resistant admixture for shotcrete and application thereof |
| CN114538820A (en) * | 2022-04-27 | 2022-05-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Sprayed concrete rebound inhibition method based on full flow control |
| CN114804749A (en) * | 2022-04-29 | 2022-07-29 | 中铁三局集团有限公司 | Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof |
| CN114907072A (en) * | 2022-05-24 | 2022-08-16 | 中建八局检测科技有限公司 | Plateau tunnel shotcrete and preparation method thereof |
| CN115073054A (en) * | 2022-07-21 | 2022-09-20 | 北京建筑大学 | High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof |
| CN115536302A (en) * | 2022-11-07 | 2022-12-30 | 贵州天威建材科技有限责任公司 | Silicomanganese slag-based super early-strength shotcrete admixture and shotcrete |
| CN115536300A (en) * | 2022-10-31 | 2022-12-30 | 中铁十一局集团有限公司 | Functional admixture for shotcrete and preparation method and application thereof |
| CN115849764A (en) * | 2022-11-25 | 2023-03-28 | 四川沃庆新材料科技有限公司 | Sprayed concrete admixture and preparation method and application thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456851B (en) * | 2020-11-07 | 2022-05-03 | 江苏博拓新型建筑材料股份有限公司 | Water-reducing early strength mineral admixture and preparation method thereof |
| CN112456851A (en) * | 2020-11-07 | 2021-03-09 | 江苏博拓新型建筑材料股份有限公司 | Water-reducing early strength mineral admixture and preparation method thereof |
| CN114477843B (en) * | 2022-01-27 | 2022-09-09 | 武汉源锦建材科技有限公司 | Heat-resistant admixture for shotcrete and application thereof |
| CN114477843A (en) * | 2022-01-27 | 2022-05-13 | 武汉源锦建材科技有限公司 | Heat-resistant admixture for shotcrete and application thereof |
| CN114538820A (en) * | 2022-04-27 | 2022-05-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Sprayed concrete rebound inhibition method based on full flow control |
| CN114538820B (en) * | 2022-04-27 | 2022-08-09 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Sprayed concrete rebound inhibition method based on full flow control |
| CN114804749A (en) * | 2022-04-29 | 2022-07-29 | 中铁三局集团有限公司 | Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof |
| CN114907072A (en) * | 2022-05-24 | 2022-08-16 | 中建八局检测科技有限公司 | Plateau tunnel shotcrete and preparation method thereof |
| CN115073054A (en) * | 2022-07-21 | 2022-09-20 | 北京建筑大学 | High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof |
| CN115536300A (en) * | 2022-10-31 | 2022-12-30 | 中铁十一局集团有限公司 | Functional admixture for shotcrete and preparation method and application thereof |
| CN115536300B (en) * | 2022-10-31 | 2023-09-29 | 中铁十一局集团有限公司 | Functional admixture for sprayed concrete and preparation method and application thereof |
| CN115536302A (en) * | 2022-11-07 | 2022-12-30 | 贵州天威建材科技有限责任公司 | Silicomanganese slag-based super early-strength shotcrete admixture and shotcrete |
| CN115536302B (en) * | 2022-11-07 | 2023-09-12 | 贵州天威建材科技有限责任公司 | Silicon-manganese slag-based super-early-strength sprayed concrete admixture and sprayed concrete |
| CN115849764A (en) * | 2022-11-25 | 2023-03-28 | 四川沃庆新材料科技有限公司 | Sprayed concrete admixture and preparation method and application thereof |
| CN115849764B (en) * | 2022-11-25 | 2023-10-27 | 四川沃庆新材料科技有限公司 | Sprayed concrete admixture and preparation method and application thereof |
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