CN107235684A - A kind of recycled fine aggregate ultra-high performance concrete and its application method - Google Patents
A kind of recycled fine aggregate ultra-high performance concrete and its application method Download PDFInfo
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- CN107235684A CN107235684A CN201710472311.1A CN201710472311A CN107235684A CN 107235684 A CN107235684 A CN 107235684A CN 201710472311 A CN201710472311 A CN 201710472311A CN 107235684 A CN107235684 A CN 107235684A
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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
- 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
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of recycled fine aggregate ultra-high performance concrete and its application method, the mass ratio of the ultra-high performance concrete primary raw material is：Portland cement：Silicon ash：Silica flour：Fine aggregate：Water reducer：Water=1：0.25~0.35：0.35~0.40：1.0~1.2：0.02~0.03：0.20 ~ 0.25, steel fibre volume volume is 0.5 ~ 3%.The fine aggregate, according to percetage by weight, recycled fine aggregate：30~100%；Natural sand：0~70%；Recycled fine aggregate belongs to
Description
Technical field
The invention belongs to ultra-high performance concrete field, and in particular to a kind of recycled fine aggregate ultra-high performance concrete and its
Application method.
Background technology
Ultra-high performance concrete is a kind of high intensity, high tenacity, the ultra-high-strength cement-based composites of low porosity.Although coming out
Time it is not long, but because of its good mechanical property and excellent durability, be applied in engineering construction field.The world
The footbridge that upper First is built by material of RPC is located at the severe Canadian Sherbrooke cities of weather conditions, in high humility
Environment, frequently acted on by deicing salt corrosion and Frozen-thawed cycled under, use state is good so far for the bridge.
Ultra-high performance concrete is made up of materials such as Portland cement, silicon ash, silica flour, natural sand and steel fibres,
Agitated, cast and steam press maintenance are made.Ultra-high performance concrete has the spies such as superhigh intensity, superhigh tenacity and superelevation durability
Point.
Although ultra-high performance concrete possesses many significant advantages, there is also defect.Prepare ultra-high performance concrete
Raw material be usually Portland cement, silicon ash, natural sand, silica flour, steel fibre and water reducer etc., production cost is general
The several times of logical concrete.In most of engineerings, conventional concrete satisfiability can be required, and ultra-high performance concrete price is high
It is expensive, it is difficult to replace conventional concrete, cause its popularization to be restricted.Using building waste and discarded concrete production again
Raw aggregate, can both reduce solid waste discharge pollution on the environment, save substantial amounts of processing cost, can make up again
The deficiency of natural sand stone, is reduced because construction industry needs the exploitation to natural sand stone, conservation of nature environment ensures the harmonious hair of society
Exhibition, produces good economic benefit, social benefit and environmental benefit.Therefore, the processing method of solid waste most worthy, just
It is that it is produced into regeneration aggregate, among building trade, realizes the purpose turned waste into wealth.Processing to discarded concrete
Processing, forms high-quality regeneration aggregate, limited resource can be enable to recycle, part environmental issue is solved again.This is
Develop green concrete, realize one of major measure of resource environment sustainable development.So, day is replaced using recycled fine aggregate
Recycled fine aggregate ultra-high performance concrete prepared by right sand cost-effective and environmentally friendly, is with a wide range of applications.
At present, a kind of discarded concrete powder of CN104692740A Sui Yu forces application（Coagulation is discarded to building waste
Soil is broken, screens out after regenerated coarse aggregate and recycled fine aggregate, the remaining powder less than 0.15mm）The reactive powder of preparation is mixed
Solidifying soil is made up of following components：Portland cement, silicon ash, water, discarded concrete powder, polycarboxylate water-reducer and thin
Sand.RPC is prepared by the use of discarded concrete as active powder substitution part silicon ash, building waste can be solved
Handling problems, building waste can be made to obtain recycling utilization again, the preparation cost of RPC can be reduced.Should
In invention when discarded concrete powder to the substitution rate of silicon ash is 30% when, the anti-folding degree of the concrete of preparation is 16.5MPa,
Compression strength is 104.75MPa.Although the patent has used discarded concrete powder, recycled fine aggregate is not used（Its particle diameter
Scope is 0.15~4.75 mm）, therefore it is not high for the utilization rate of discarded concrete.
CN104003682A Zhao Shang, which are passed, has applied for a kind of ultra-high performance concrete, and the invention discloses a kind of very-high performance
Concrete, described ultra-high performance concrete includes following material：Binder materials, gathers materials, water, steel fibre, water reducer, froth breaking
Agent；Gather materials including：3~5mm of particle diameter Machine-made Sand, 1~3mm of particle diameter Machine-made Sand and particle diameter is 0.21~0.42mm river sand；
Gel rubber material includes portland cement, quick-hardening cement and grinding fine cement.The ultra-high performance concrete of the Invention Announce is not only reduced
Cost, simplifies maintaining process, and functional.Ultra-high performance concrete prepared by the patent has used Machine-made Sand,
But without using recycled fine aggregate.
, may be due to comparing there is presently no recycled fine aggregate to be used for the Patents and report of ultra-high performance concrete
In natural sand, recycled fine aggregate properties are poor, and superelevation may be substantially reduced for preparing ultra-high performance concrete
The performance of energy concrete, but from existing patent, because steel fibre is suppressing crack progressing so as to improve concrete strength
Aspect plays leading role, and discarded concrete powder has been used to ultra-high performance concrete, and employment mechanism sand prepares very-high performance
Concrete is also possibly realized.If choosing the recycled fine aggregate of high-quality, and control the recycled fine aggregate for ultra-high performance concrete
Maximum particle diameter and consumption etc., mix appropriate steel fibre, prepare satisfactory ultra-high performance concrete feasible.This hair
The bright recycled fine aggregate ultra-high performance concrete being related to has very high application value and wide popularizing application prospect.
The content of the invention
In view of the present situation of current ultra-high performance concrete, is formulated to it and is improved.Replaced respectively using recycled fine aggregate
0%th, 25%, 50%, 75%, 100% natural sand, the resistance to compression of ultra-high performance concrete and rupture strength regularly decline, but intensity
The requirement of conventional ultra high performance concrete intensity can still be met.For conventional ultra high performance concrete, from the state promulgated
Mark《RPC》（GB/T 31387-2015）Understand, its minimum compression strength is 100MPa.Use particle size range for
Ultra-high performance concrete and use particle size range for 0.15 ~ 4.75mm regeneration prepared by 0.15 ~ 1.18mm recycled fine aggregate
Ultra-high performance concrete prepared by fine aggregate is compared, and the former resistance to compression and rupture strength is significantly improved.It is mixed with conventional ultra high performance
Solidifying soil is compared, and replaces ultra-high performance concrete prepared by natural sand with recycled fine aggregate, and it generates good economic effect simultaneously
Benefit, social benefit, environmental benefit.
It is an object of the invention to provide a kind of recycled fine aggregate ultra-high performance concrete and its application method, it have compared with
High intensity, cost-effective and environmentally friendly.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of recycled fine aggregate ultra-high performance concrete, the mass ratio of its primary raw material is：Portland cement：Silicon ash：Stone
Ying Fen：Fine aggregate：Water reducer：Water=1：0.25~0.35：0.35~0.40：1.0~1.2：0. 02~0.03：0.20 ~ 0.25, steel is fine
It is 0.5 ~ 3% to tie up volume volume.The fine aggregate, according to percetage by weight, recycled fine aggregate：30~100%；Natural sand：0~70%.
Recycled fine aggregate used belongs toClass recycled fine aggregate, partly or entirely replaces natural sand to be used as the thin of ultra-high performance concrete
Aggregate.The particle size range of recycled fine aggregate is 0.15 ~ 1.18mm or 0.15 ~ 4.75mm.To ensure later strength, and reduction early stage
The heat of hydration, should use C2The high Portland cement of S contents, wherein C2S content is 25 ~ 35%；, should to ensure water-reducing effect
Use polycarboxylic acid series high efficiency water reducing agent.The particle diameter of silica flour is 325 ~ 350 mesh.
Application method comprises the following steps：First by Portland cement, silicon ash, silica flour and fine aggregate dry mixing 3 minutes；
Then add in the half water dissolved with water reducer, stir 2 minutes, be equably sprinkled into steel fibre while stirring in whipping process；
Second half water dissolved with water reducer is added, is stirred 2 ~ 3 minutes；Finally pour into the mold, by slurry send into it is quiet stop in fog room support
Shield one day, is then fed into steam press maintenance in the still kettle of factory.Steaming pressuring curing system is to vacuumize half an hour, and increasing temperature and pressure 1 is small
When, constant temperature and pressure 6 hours is depressured 2 hours, and thermostat temperature is 190~200 DEG C, and constant-pressure pressure is 1.2MPa, after the completion of maintenance,
It can obtain recycled fine aggregate ultra-high performance concrete product.
Compared with prior art, the invention has the advantages that：
（1）Contain silicon ash in the slurries of ultra-high performance concrete, because silicon ash particle diameter is in 200nm or so, regeneration can be filled thin
The hole of aggregate, and with Ca (OH)2Reaction generation C-S-H gels, this can be improved in recycled fine aggregate with intensifying regenerating fine aggregate
Portion's micro-crack is more, the low defect of aggregate intensity.Recycled fine aggregate can reduce the cost of ultra-high performance concrete again.Both is excellent
Gesture is complementary.
（2）Because recycled fine aggregate is smaller than natural sand apparent density, therefore recycled fine aggregate ultra-high performance concrete is close
Degree is less than conventional ultra high performance concrete.With the increase of recycled fine aggregate substitution amount, recycled fine aggregate ultra-high performance concrete
Density reduction.
（3）Because recycled fine aggregate apparent density is small, porosity is high, there is higher water absorption rate, in later concrete hardening
During, these moisture can be come out with slow release, so that binder materials can more fully react, and reduce its contraction
With creep.
（4）As a result of recycled fine aggregate, the utilization rate of China's solid waste is improved, making for natural sand is reduced
With, economize on resources, meet the state basic policy of energy-conserving and environment-protective, and the cost of ultra-high performance concrete is reduced, it is adapted to popularization and application.
Embodiment
Recycled fine aggregate ultra-high performance concrete, the mass ratio of its primary raw material is：Portland cement：Silicon ash：Stone
Ying Fen：Fine aggregate：Water reducer：Water=1：0.25~0.35：0.35~0.40：1.0~1.2：0. 02~0.03：0.20 ~ 0.25, steel is fine
It is 0.5 ~ 3% to tie up volume volume.The fine aggregate, according to percetage by weight, recycled fine aggregate：30~100%；Natural sand：0~70%.
Recycled fine aggregate used belongs toClass recycled fine aggregate, partly or entirely replaces natural sand to be used as the thin of ultra-high performance concrete
Aggregate.The particle size range of recycled fine aggregate is 0.15 ~ 1.18mm or 0.15 ~ 4.75mm.To ensure later strength, and reduction early stage
The heat of hydration, should use C2The high Portland cement of S contents, wherein C2S content is 25 ~ 35%；, should to ensure water-reducing effect
Use polycarboxylic acid series high efficiency water reducing agent.The particle diameter of silica flour is 325 ~ 350 mesh.
Application method comprises the following steps：First by Portland cement, silicon ash, silica flour and fine aggregate dry mixing 3 minutes；
Then add in the half water dissolved with water reducer, stir 2 minutes, be equably sprinkled into steel fibre while stirring in whipping process；
Second half water dissolved with water reducer is added, is stirred 2 ~ 3 minutes；Finally pour into the mold, by slurry send into it is quiet stop in fog room support
Shield one day, is then fed into steam press maintenance in the still kettle of factory.Steaming pressuring curing system is to vacuumize half an hour, and increasing temperature and pressure 1 is small
When, constant temperature and pressure 6 hours is depressured 2 hours, and thermostat temperature is 190~200 DEG C, and constant-pressure pressure is 1.2MPa, after the completion of maintenance,
It can obtain recycled fine aggregate ultra-high performance concrete product.Recycled fine aggregate and natural sand property indices are with reference to GB/T
25176-2010《Concrete and mortar recycled fine aggregate》With GB/T 14684-2011《Building sand》Detected.
Embodiment 1
A kind of recycled fine aggregate ultra-high performance concrete, the mass ratio of its primary raw material is：Portland cement：Silicon ash：Stone
Ying Fen：Fine aggregate：Water reducer：Water=1：0.35：0.35：1.12：0. 025：0.243, steel fibre volume volume is 2%.It is described thin
Aggregate, according to percetage by weight, recycled fine aggregate：50%；Natural sand：50%.Recycled fine aggregate used belongs toClass regenerates thin bone
Material, part replaces natural sand as the fine aggregate of ultra-high performance concrete.The particle size range of recycled fine aggregate be 0.15 ~
4.75mm.Use C2The high Portland cement of S contents, wherein C2S content is 30%；Use polycarboxylic acids high efficiency diminishing
Agent.The particle diameter of silica flour is 350 mesh.
First by Portland cement, silicon ash, silica flour and fine aggregate dry mixing 3 minutes；Then add dissolved with water reducer
In half water, stir 2 minutes, be equably sprinkled into steel fibre while stirring in whipping process；Add dissolved with the another of water reducer
Half water, is stirred 2 minutes；Finally pour into the mold, by slurry send into it is quiet stop in fog room conserve one day, be then fed into the steaming of factory
Press steam press maintenance in kettle.Steaming pressuring curing system is to vacuumize half an hour, increasing temperature and pressure 1 hour, constant temperature and pressure 6 hours, decompression 2
Hour, thermostat temperature is 190~200 DEG C, and constant-pressure pressure is 1.2MPa, after the completion of maintenance, obtains recycled fine aggregate very-high performance
Concrete product, its 3d mean compressive strength is 136.26MPa, and the average rupture strengths of 3d are 32.19MPa；
Embodiment 2
A kind of recycled fine aggregate ultra-high performance concrete, the mass ratio of its primary raw material is：Portland cement：Silicon ash：Stone
Ying Fen：Fine aggregate：Water reducer：Water=1：0.35：0.35：1.12：0. 025：0.243, steel fibre volume volume is 2%.It is described thin
Aggregate, according to percetage by weight, recycled fine aggregate：100%；Natural sand：0%.Recycled fine aggregate used belongs toClass regenerates thin bone
Material, all replaces natural sand as the fine aggregate of ultra-high performance concrete.The particle size range of recycled fine aggregate be 0.15 ~
4.75mm.Use C2The high Portland cement of S contents, wherein C2S content is 30%；Use polycarboxylic acids high efficiency diminishing
Agent.Silica flour uses 325 mesh silica flours.
First by Portland cement, silicon ash, silica flour and fine aggregate dry mixing 3 minutes；Then add dissolved with water reducer
In half water, stir 2 minutes, be equably sprinkled into steel fibre while stirring in whipping process；Add dissolved with the another of water reducer
Half water, is stirred 3 minutes；Finally pour into the mold, by slurry send into it is quiet stop in fog room conserve one day, be then fed into the steaming of factory
Press steam press maintenance in kettle.Steaming pressuring curing system is to vacuumize half an hour, increasing temperature and pressure 1 hour, constant temperature and pressure 6 hours, decompression 2
Hour, thermostat temperature is 190~200 DEG C, and constant-pressure pressure is 1.2MPa, after the completion of maintenance, obtains recycled fine aggregate very-high performance
Concrete product, its 3d mean compressive strength is 123.67MPa, and the average rupture strengths of 3d are 27.14MPa；
Embodiment 3
A kind of recycled fine aggregate ultra-high performance concrete, the mass ratio of its primary raw material is：Portland cement：Silicon ash：Stone
Ying Fen：Fine aggregate：Water reducer：Water=1：0.35：0.35：1.12：0. 025：0.243, steel fibre volume volume is 2%.It is described thin
Aggregate, according to percetage by weight, recycled fine aggregate：100%；Natural sand：0%.Recycled fine aggregate used belongs toClass regenerates thin bone
Material, all replaces natural sand as the fine aggregate of ultra-high performance concrete.The particle size range of recycled fine aggregate be 0.15 ~
1.18mm.Use C2The high Portland cement of S contents, wherein C2S content is 30%；Use polycarboxylic acids high efficiency diminishing
Agent.Silica flour uses 350 mesh silica flours.
First by Portland cement, silicon ash, silica flour and fine aggregate dry mixing 3 minutes；Then add dissolved with water reducer
In half water, stir 2 minutes, be equably sprinkled into steel fibre while stirring in whipping process；Add dissolved with the another of water reducer
Half water, is stirred 3 minutes；Finally pour into the mold, by slurry send into it is quiet stop in fog room conserve one day, be then fed into the steaming of factory
Press steam press maintenance in kettle.Steaming pressuring curing system is to vacuumize half an hour, increasing temperature and pressure 1 hour, constant temperature and pressure 6 hours, decompression 2
Hour, thermostat temperature is 190~200 DEG C, and constant-pressure pressure is 1.2MPa, after the completion of maintenance, obtains recycled fine aggregate very-high performance
Concrete product, its 3d mean compressive strength is 146.84MPa, and the average rupture strengths of 3d are 34.69MPa；
Above is embodiments of the invention, further illustrate the present invention, but the present invention is not limited only to this.
Claims (4)
1. a kind of recycled fine aggregate ultra-high performance concrete, it is characterised in that：The recycled fine aggregate ultra-high performance concrete master
The mass ratio for wanting raw material is：Portland cement：Silicon ash：Silica flour：Fine aggregate：Water reducer：Water=1：0.25~0.35：0.35
~0.40：1.0~1.2：0. 02~0.03：0.20 ~ 0.25, steel fibre volume volume is 0.5 ~ 3%；The fine aggregate, according to weight
Percentage, recycled fine aggregate：30~100%；Natural sand：0~70%.
2. recycled fine aggregate ultra-high performance concrete according to claim 1, it is characterised in that：Recycled fine aggregate used
Belong toClass recycled fine aggregate, partly or entirely replaces natural sand as the fine aggregate of ultra-high performance concrete；Recycled fine aggregate
Particle size range is 0.15 ~ 1.18mm or 0.15 ~ 4.75mm.
3. recycled fine aggregate ultra-high performance concrete according to claim 1, it is characterised in that：The normal silicate water
C in mud2S content is 25 ~ 35%；Water reducer is polycarboxylic acid series high efficiency water reducing agent；The particle diameter of silica flour is 325 ~ 350 mesh.
4. a kind of application method of recycled fine aggregate ultra-high performance concrete as described in claim 1-3 is any, its feature exists
In：Comprise the following steps：First by Portland cement, silicon ash, silica flour and fine aggregate dry mixing 3 minutes；Then add dissolved with
In the half water of water reducer, stir 2 minutes, be equably sprinkled into steel fibre while stirring in whipping process；Add dissolved with subtracting
Second half water of aqua, is stirred 2 ~ 3 minutes；Finally pour into the mold, by slurry send into it is quiet stop in fog room conserve one day, then send
Enter steam press maintenance in the still kettle of factory；Steaming pressuring curing system is to vacuumize half an hour, increasing temperature and pressure 1 hour, constant temperature and pressure 6
Hour, it is depressured 2 hours, thermostat temperature is 190~200 DEG C, and constant-pressure pressure is 1.2MPa, after the completion of maintenance, obtains regenerating thin bone
Expect ultra-high performance concrete product.
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| CN108285310A (en) * | 2018-03-08 | 2018-07-17 | 东南大学 | A kind of ultra-high performance concrete and preparation method thereof prepared using discarded concrete recycled fine aggregate |
| CN108892449A (en) * | 2018-07-16 | 2018-11-27 | 成都宏基建材股份有限公司 | A kind of recycled fine aggregate non-light tight concrete and preparation method thereof |
| CN108894432A (en) * | 2018-07-19 | 2018-11-27 | 浙江大学 | A kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column |
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| CN116553887A (en) * | 2023-05-08 | 2023-08-08 | 东南大学 | High-strength recycled fine aggregate concrete |
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