CN109320175A - A kind of low-elasticity-modulus fiber seif-citing rate regeneration concrete and preparation method thereof - Google Patents
A kind of low-elasticity-modulus fiber seif-citing rate regeneration concrete and preparation method thereof Download PDFInfo
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- CN109320175A CN109320175A CN201811438186.3A CN201811438186A CN109320175A CN 109320175 A CN109320175 A CN 109320175A CN 201811438186 A CN201811438186 A CN 201811438186A CN 109320175 A CN109320175 A CN 109320175A
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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
- C04B28/06—Aluminous cements
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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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
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a kind of low-elasticity-modulus fiber seif-citing rate regeneration concretes and preparation method thereof, it is made of the raw material for including following parts by weight: 240~1200 parts of regenerated coarse aggregate, 0~840 part of natural coarse aggregate, natural 500~800 parts of fine aggregate, 650~850 parts of cement, 0~15 part of high efficiency water reducing agent, 150~280 parts of mixing water, 0~156 part of fiber.Regenerated coarse aggregate is discarded concrete test block through obtained by artificial, hammer crushing crusher machine.Fiber uses one kind of the low-elasticity-modulus fibers such as polypropylene fibre, nylon fiber.The present invention reduces concrete early-age plastic using low-elasticity-modulus fiber and cracks, and reduces dry shrinkage, improves fire resistance, shock resistance, toughness of regeneration concrete etc..The utilization efficiency that recycled aggregate can be greatly improved by this novel composite material, realizes the Sustainable Development Road of construction material.
Description
Technical field
The present invention relates to a kind of regeneration concrete more particularly to a kind of low-elasticity-modulus fiber seif-citing rate regeneration concrete and its systems
Preparation Method.
Background technique
With the fast development of construction industry, a large amount of building waste is generated in building construction and demolishing process, wherein
30%~40% is discarded concrete, and thus the problems such as caused land occupation, environmental pollution has caused extensive concern both domestic and external.I
The social sustainable development strategy that government of state formulates, encourages the research and application of castoff regenerative technology.1997, firmly the portion of building will
" building waste residue comprehensive utilization " is included in scientific and technological achievement key popularized project.2002, Shanghai municipal government " will carry out exploitation regenerated
Abandon concrete and study new key technology and efficiently utilize it " it is included in key project.2010, the Ministry of Construction put into effect " mixed
Solidifying soil and mortar recycled fine aggregate " and " concrete regenerated coarse aggregate " two national standards, the engineering of recycled aggregate is answered
With being standardized.Currently, the problem of resource utilization of discarded concrete, has become the hot spot that current international community is paid close attention to jointly
One of with advanced problems.
By recycled concrete aggregate, after crushing, cleaning and grading, it is mixed that regeneration is mixed to form with gradation according to a certain percentage
Solidifying soil aggregate, by the concrete that it partly or entirely replaces natural aggregate to be formulated, referred to as regeneration concrete.Regeneration concrete
On the one hand technology realizes the cycling and reutilization of a large amount of discarded concretes, solve the problem of environmental pollution of discarded concrete；Separately
On the one hand, natural aggregate is replaced with the recycled aggregates of building waste, it is possible to reduce consumption of the construction industry to natural aggregate, from
And reduce exploitation to natural sand stone, to environmental protection, economize on resources, developing ecology building all has extremely important meaning.
However, recycled aggregate has the characteristics that porosity is high, water imbibition is strong, density is small low with intensity relative to natural aggregate.These are special
Point causes compression strength, tensile strength, flexural strength, durability of regeneration concrete etc. all lower than normal concrete, very great Cheng
Its popularization and application in engineering is limited on degree.
In this context, the present invention proposes a kind of novel composite material-low-elasticity-modulus fiber seif-citing rate regeneration concrete,
Low-elasticity-modulus fiber is added in regeneration concrete, concrete early-age plastic is reduced using low-elasticity-modulus fiber and cracks, reduce concrete
Drying shrinkage deformation improves fire resistance, shock resistance, toughness of regeneration concrete etc..Pass through this novel composite wood
The utilization efficiency of recycled aggregate can be improved in material, realizes the sustainable development of construction material.
Summary of the invention
It is an object of the present invention to make full use of discarded concrete, regeneration concrete, fiber concrete, seif-citing rate are mixed
Solidifying soil technology combines, and proposes a kind of novel composite material-low-elasticity-modulus fiber seif-citing rate regeneration concrete, and provide system
Preparation Method.Such new material, can solve discarded concrete recycles, regeneration concrete performance is poor, internal fissure excessively, prolong
The problems such as property is poor, can significantly improve the stress performance of regenerated aggregate concrete structure.
To achieve the purpose of the present invention, solution are as follows:
A kind of preparation method of low-elasticity-modulus fiber seif-citing rate regeneration concrete, comprising the following steps:
Step 1, cement, low-elasticity-modulus fiber, high efficiency water reducing agent are mixed 2~8 minutes, until uniform；
Step 2, in 15 minutes, concrete mixing water will be added in the mixture of step 1, stirs 1.5~3 minutes, system
Make cement slurry；
Step 3, in 15 minutes, fine aggregate will be added in the cement slurry of step 2 and mix 1.5~3 minutes is to uniform,
Produce cement mortar slurry；
Step 4, it in 15 minutes, will be added in the cement mortar slurry of step 3 by natural coarse aggregate and regenerated coarse aggregate
The coarse aggregate of composition simultaneously mix 1.5~3 minutes, until it is uniform, produce low-elasticity-modulus fiber seif-citing rate regeneration concrete.It is obtained low
Playing modulus fibre seif-citing rate regeneration concrete will complete to pour in 30 minutes.If it exceeds 30 minutes, regeneration concrete has occurred
Initial set, then the concrete cannot be reused because intensity declines.
A kind of low-elasticity-modulus fiber seif-citing rate regeneration concrete made from above-mentioned preparation method, the low-elasticity-modulus fiber seif-citing rate
Again
Growing concrete prepares the parts by weight of feed components are as follows:
240~1200 parts of regenerated coarse aggregate；
0~840 part of natural coarse aggregate；
500~800 parts of fine aggregate；
650~850 parts of cement；
0~15 part of high efficiency water reducing agent；
150~280 parts of mixing water；
0~156 part of low-elasticity-modulus fiber.
A kind of preparation method of above-mentioned low-elasticity-modulus fiber seif-citing rate regeneration concrete, in the step 1, the cement is adopted
With silicate self-stressing cement, aluminium sulfate self-stressing cement or aluminate self-stressing cement；The low-elasticity-modulus fiber is low
Modulus fibre, the low-elasticity-modulus fiber are polypropylene fibre or nylon fiber.
A kind of preparation method of above-mentioned low-elasticity-modulus fiber seif-citing rate regeneration concrete, in the step 3, fine aggregate is used
Middle sand, fineness modulus are 2~3.
A kind of preparation method of above-mentioned low-elasticity-modulus fiber seif-citing rate regeneration concrete, in the step 4, the coarse aggregate
In regenerated coarse aggregate be discarded concrete test block through obtained by artificial, hammer crushing crusher machine, regenerated coarse aggregate partial size is 5~
25mm, regenerated coarse aggregate substitution rate are 30%~100%.
The present invention has the advantages that the deficiency in terms of overcoming Mechanical properties of recycled concrete and working performance, hews out
One can promote and apply the new road of Aggregate of recycled concrete, i.e., by it in conjunction with low-elasticity-modulus fiber, self-stressing cement, form one
Novel composite material-low-elasticity-modulus fiber seif-citing rate the regeneration concrete of kind.Concrete early-age plastic is reduced using low-elasticity-modulus fiber
Cracking reduces dry shrinkage, improves fire resistance, shock resistance, toughness of regeneration concrete etc..
Specific embodiment
Below by embodiment, the technical solutions of the present invention will be further described.
[embodiment 1]
A kind of preparation method of low-elasticity-modulus fiber seif-citing rate regeneration concrete, comprising the following steps:
Step 1, cement, low-elasticity-modulus fiber, high efficiency water reducing agent are mixed 2~8 minutes, until uniform；
Step 2, in 15 minutes, concrete mixing water will be added in the mixture of step 1, stirs 1.5~3 minutes, system
Make cement slurry；
Step 3, in 15 minutes, fine aggregate will be added in the cement slurry of step 2 and stirs 1.5~3 minutes, until equal
It is even, produce cement mortar slurry；
Step 4, it in 15 minutes, will be added in the cement mortar slurry of step 3 by natural coarse aggregate and regenerated coarse aggregate
The coarse aggregate of composition simultaneously mix 1.5~3 minutes, until it is uniform, produce low-elasticity-modulus fiber seif-citing rate regeneration concrete.The low bullet
Modulus fibre is low elastic modulus fiber.Low-elasticity-modulus fiber seif-citing rate regeneration concrete obtained will be completed to pour in 30 minutes.
If it exceeds 30 minutes, initial set has occurred in regeneration concrete, then the concrete cannot be reused because intensity declines.
[embodiment 2]
1. by 750 parts of aluminium sulfate self-stressing cements, 5.46 parts of polypropylene fibres, 0.2 part of high efficiency water reducing agent mix 2~8
Minute, until uniform；
2. 270.5 parts of mixing waters being added in the mixture of step 1 in 15 minutes, stirring 1.5~3 minutes, produce
Cement slurry；
3. 634.1 parts of fine aggregates will be added in the cement slurry of step 2 in 15 minutes and stir 1.5~3 minutes, until
Uniformly, cement mortar slurry is produced；
4. 182.3 parts of natural coarse aggregates, 546.7 parts of regeneration will be added in the cement mortar slurry of step 3 in 15 minutes
Coarse aggregate simultaneously stirs 1.5~3 minutes, until it is uniform, produce polypropylene fibre seif-citing rate regenerated aggregate concrete；Low bullet obtained
Modulus fibre seif-citing rate regeneration concrete will be completed to pour in 30 minutes.If it exceeds 30 minutes, regeneration concrete has occurred just
Solidifying, then the concrete cannot be reused because intensity declines.
In above-mentioned steps 3, sand in fine aggregate use, fineness modulus is 2~3.
In above-mentioned steps 4, the regenerated coarse aggregate in the coarse aggregate is discarded concrete test block through artificial, hammer mill
Broken gained, regenerated coarse aggregate partial size are 5~25mm, and regenerated coarse aggregate substitution rate is 30%~100%.
The polypropylene fibre seif-citing rate regenerated aggregate concrete made using this preparation method, the flowing slump >=
550mm, self-stress value >=3MPa.According to national standard " standard for test methods of mechanical properties of ordinary concrete " (GB/T50081-
2016) cubic compressive strength of concrete is tested, result 41.1MPa.
It is to be noted that the weight of the every portion of different component is identical.
[embodiment 3]
1. by 750 parts of aluminium sulfate self-stressing cements, 5.46 parts of polypropylene fibres, 0.9 part of high efficiency water reducing agent mix 2~8
Minute, until uniform；
2. 233.8 parts of mixing waters being added in the mixture of step 1 in 15 minutes, stirring 1.5~3 minutes, produce
Cement slurry；
3. 675.8 parts of fine aggregates will be added in the cement slurry of step 2 in 15 minutes and stir 1.5~3 minutes, until
Uniformly, cement mortar slurry is produced；
4. 189 parts of natural coarse aggregates, 567 parts of thick bones of regeneration will be added in the cement mortar slurry of step 3 in 15 minutes
Expect and stirs 1.5~3 minutes, until it is uniform, produce polypropylene fibre seif-citing rate regenerated aggregate concrete；Low-elasticity-modulus obtained is fine
Dimension seif-citing rate regeneration concrete will be completed to pour in 30 minutes.If it exceeds 30 minutes, initial set has occurred in regeneration concrete, then
The concrete cannot be reused because of intensity decline.
In above-mentioned steps 3, sand in fine aggregate use, fineness modulus is 2~3.
In above-mentioned steps 4, the regenerated coarse aggregate in the coarse aggregate is discarded concrete test block through artificial, hammer mill
Broken gained, regenerated coarse aggregate partial size are 5~25mm, and regenerated coarse aggregate substitution rate is 30%~100%.
The polypropylene fibre seif-citing rate regenerated aggregate concrete made using this preparation method, the flowing slump >=
550mm, self-stress value >=3MPa.According to national standard " standard for test methods of mechanical properties of ordinary concrete " (GB/T50081-
2016) cubic compressive strength of concrete is tested, result 52.3MPa.
[embodiment 4]
1. by 750 parts of aluminium sulfate self-stressing cements, 5.46 parts of polypropylene fibres, 0.9 part of high efficiency water reducing agent mix 2~8
Minute, until uniform；
2. 225.9 parts of mixing waters being added in the mixture of step 1 in 15 minutes, stirring 1.5~3 minutes, produce
Cement slurry；
3. 675.8 parts of fine aggregates will be added in the cement slurry of step 2 in 15 minutes and stir 1.5~3 minutes, until
Uniformly, cement mortar slurry is produced；
4. 378 parts of natural coarse aggregates, 378 parts of thick bones of regeneration will be added in the cement mortar slurry of step 3 in 15 minutes
Expect and stirs 1.5~3 minutes, until it is uniform, produce polypropylene fibre seif-citing rate regenerated aggregate concrete；Low-elasticity-modulus obtained is fine
Dimension seif-citing rate regeneration concrete will be completed to pour in 30 minutes.If it exceeds 30 minutes, initial set has occurred in regeneration concrete, then
The concrete cannot be reused because of intensity decline.
In above-mentioned steps 3, sand in fine aggregate use, fineness modulus is 2~3.
In above-mentioned steps 4, the regenerated coarse aggregate in the coarse aggregate is discarded concrete test block through artificial, hammer mill
Broken gained, regenerated coarse aggregate partial size are 5~25mm, and regenerated coarse aggregate substitution rate is 30%~100%.
The polypropylene fibre seif-citing rate regenerated aggregate concrete made using this preparation method, the flowing slump >=
550mm, self-stress value >=3MPa.According to national standard " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-
2016) cubic compressive strength of concrete is tested, result 55.4MPa.
The invention has the advantages that low-elasticity-modulus fiber seif-citing rate regenerated aggregate concrete has given full play to the enhancing of fiber
Effect, effectively improves the toughness of regeneration concrete, reduces the creep and shrinkage of regeneration concrete, enhance regeneration concrete
Moulding, compared with traditional regeneration concrete structure, the mechanical properties such as endurance, abrasion performance, toughness are obtained significantly
It improves.The present invention applies the mechanical property of regenerated aggregate concrete sufficiently, not only solves building castoff to environment
Pollution problem and exploitation natural sand stone aggregate to ecology destruction, also widened the application approach of regeneration concrete.It can be with
, it is envisioned that this new composite structure for meeting National Sustainable Development Strategies, centainly there is wide application market and prospect.
Claims (5)
1. a kind of preparation method of low-elasticity-modulus fiber seif-citing rate regeneration concrete, which comprises the following steps:
Step 1, cement, low-elasticity-modulus fiber, high efficiency water reducing agent are mixed evenly；
Step 2, concrete mixing water will be added in the mixture of step 1, cement slurry is produced in stirring；
Step 3, fine aggregate will be added in the cement slurry of step 2 and mix is uniform, produce cement mortar slurry；
Step 4, the coarse aggregate being made of natural coarse aggregate and regenerated coarse aggregate will be added in the cement mortar slurry of step 3 and mix
It closes uniformly, produces low-elasticity-modulus fiber seif-citing rate regeneration concrete；
The low-elasticity-modulus fiber is polypropylene fibre or nylon fiber.
2. a kind of low-elasticity-modulus fiber seif-citing rate regeneration concrete, feature made from preparation method according to claim 1
It is, the parts by weight which prepares feed components are as follows:
240~1200 parts of regenerated coarse aggregate；
0~840 part of natural coarse aggregate；
500~800 parts of fine aggregate；
650~850 parts of cement；
0~15 part of high efficiency water reducing agent；
150~280 parts of mixing water；
0~156 part of low-elasticity-modulus fiber.
3. a kind of preparation method of low-elasticity-modulus fiber seif-citing rate regeneration concrete according to claim 1, which is characterized in that
In the step 1, the cement uses silicate self-stressing cement, aluminium sulfate self-stressing cement or aluminic acid.
4. a kind of preparation method of low-elasticity-modulus fiber seif-citing rate regeneration concrete according to claim 1, which is characterized in that
In the step 3, sand in fine aggregate use, fineness modulus is 2~3.
5. a kind of preparation method of low-elasticity-modulus fiber seif-citing rate regeneration concrete according to claim 1, which is characterized in that
In the step 4, the regenerated coarse aggregate in the coarse aggregate is discarded concrete test block through artificial, hammer crushing crusher machine institute
, regenerated coarse aggregate partial size is 5~25mm, and regenerated coarse aggregate substitution rate is 30%~100%.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531494A (en) * | 2011-12-22 | 2012-07-04 | 西安中煤建筑工程有限公司 | Low elastic modulus fiber-enhanced recycled concrete preparation method |
| CN102628305A (en) * | 2012-04-28 | 2012-08-08 | 武汉大学 | Production process of novel concrete-filled steel tube composite structure |
-
2018
- 2018-11-27 CN CN201811438186.3A patent/CN109320175A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531494A (en) * | 2011-12-22 | 2012-07-04 | 西安中煤建筑工程有限公司 | Low elastic modulus fiber-enhanced recycled concrete preparation method |
| CN102628305A (en) * | 2012-04-28 | 2012-08-08 | 武汉大学 | Production process of novel concrete-filled steel tube composite structure |
Non-Patent Citations (2)
| Title |
|---|
| 中国土木工程学会: "《建筑物裂渗控制新技术 首届全国混凝土膨胀剂学术交流会论文集》", 31 August 1994, 北京：中国建材工业出版社 * |
| 杨医博等: "《土木工程材料（第二版）》", 31 December 2016, 广州：华南理工大学出版社 * |
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Application publication date: 20190212 |