CN114368953A - Low-carbon green ultra-high performance concrete and preparation method thereof - Google Patents
Low-carbon green ultra-high performance concrete and preparation method thereof Download PDFInfo
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- CN114368953A CN114368953A CN202210139839.8A CN202210139839A CN114368953A CN 114368953 A CN114368953 A CN 114368953A CN 202210139839 A CN202210139839 A CN 202210139839A CN 114368953 A CN114368953 A CN 114368953A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000011449 brick Substances 0.000 claims abstract description 161
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000004576 sand Substances 0.000 claims abstract description 87
- 239000000843 powder Substances 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000000835 fiber Substances 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 239000004568 cement Substances 0.000 claims abstract description 36
- 239000010881 fly ash Substances 0.000 claims abstract description 33
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000002699 waste material Substances 0.000 claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 47
- 239000002689 soil Substances 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 21
- 239000002002 slurry Substances 0.000 claims description 20
- 239000002253 acid Substances 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 12
- 229920006395 saturated elastomer Polymers 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 238000009736 wetting Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 32
- 239000004567 concrete Substances 0.000 description 13
- 239000011398 Portland cement Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 238000001035 drying Methods 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000007873 sieving Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
Landscapes
- 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 provides low-carbon green ultra-high performance concrete and a preparation method thereof, and relates to the technical field of building materials. The low-carbon green ultrahigh-performance concrete provided by the invention comprises the following preparation raw materials in parts by weight: 550-650 parts of cement, 250-350 parts of regenerated red brick powder, 100-200 parts of fly ash, 90-110 parts of silica fume, 550-650 parts of natural sand, 450-550 parts of regenerated red brick sand, 40-50 parts of an additive, 160-180 parts of steel fiber and 170-190 parts of water. The invention solves the problems of piling and abandoning the construction waste red bricks, processes the abandoned red bricks with the regenerated red brick powder and the regenerated red brick sand, solves the problem of resource utilization and improves the environmental protection benefit. Meanwhile, the invention solves the problems of large shrinkage, high energy consumption, high cost and poor environmental protection of the existing ultra-high performance concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to low-carbon green ultrahigh-performance concrete and a preparation method thereof.
Background
Ultra-high performance concrete, referred to as UHPC for short, is now widely used in buildings, roads and pedestrian bridges and other structures. The active fine powder for producing UHPC at present mainly comprises cement, silica fume and quartz powder, wherein the doping amount of the silica fume reaches more than 25 percent, the quartz powder reaches more than 30 percent, the fine aggregate adopts ground quartz sand, the raw materials not only consume natural resources and destroy the ecological environment, but also have very complex production process and high cost.
As cities continue to grow in size, large numbers of existing buildings are subject to demolition, thereby generating a large amount of construction waste. At present, the construction waste is treated by generally adopting a stacking and landfill mode, so that the problems of land resource waste, environmental pollution and the like are caused. Therefore, it is urgent to find a "green" treatment method to solve the problems of construction waste.
Disclosure of Invention
The invention aims to provide low-carbon green ultra-high performance concrete and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a low-carbon green ultra-high performance concrete which comprises the following preparation raw materials in parts by weight: 550-650 parts of cement, 250-350 parts of regenerated red brick powder, 100-200 parts of fly ash, 90-110 parts of silica fume, 550-650 parts of natural sand, 450-550 parts of regenerated red brick sand, 40-50 parts of an additive, 160-180 parts of steel fiber and 170-190 parts of water.
Preferably, the specific surface area of the regenerated red brick powder is 900-1000 kg/m3(ii) a The activity index in 28 days is 75-85%; the median diameter of the regenerated red brick powder is 8-10 mu m.
Preferably, the preparation method of the regenerated red brick powder comprises the following steps:
removing soil from the red bricks of the construction waste to obtain red bricks after soil removal;
sequentially carrying out primary crushing and secondary crushing on the red bricks after the soil is removed to obtain red bricks;
and grinding the red brick blocks to obtain the regenerated red brick powder.
Preferably, the particle size of the regenerated red brick sand is 0-5 mm.
Preferably, the preparation method of the recycled red brick sand comprises the following steps:
removing soil from the red bricks of the construction waste to obtain red bricks after soil removal;
sequentially carrying out primary crushing and secondary crushing on the red bricks after the soil is removed to obtain red bricks;
and screening the red brick blocks to obtain the regenerated red brick sand.
Preferably, the fly ash is a class I fly ash.
Preferably, the admixture is a polycarboxylic acid high-performance water reducing agent.
Preferably, the fineness modulus of the natural sand is 2.3-2.5; the mud content is less than or equal to 3.0 wt%; the content of mud blocks is less than or equal to 1.0 wt%.
Preferably, the steel fiber is surface copper-plated steel fiber.
The invention provides a preparation method of the low-carbon green ultra-high performance concrete, which comprises the following steps:
pre-wetting the regenerated red brick sand until the saturated surface is dry to obtain pre-wetted regenerated red brick sand;
mixing cement, fly ash, regenerated red brick powder, natural sand and silica fume to obtain a mixed dry material;
mixing the dry mixed material with water and an additive to obtain a wet mixed material;
mixing the mixed wet material with pre-wetted recycled red brick sand to obtain slurry;
and mixing the slurry with steel fibers to obtain the low-carbon green ultrahigh-performance concrete.
The invention provides a low-carbon green ultra-high performance concrete which comprises the following preparation raw materials in parts by weight: 550-650 parts of cement, 250-350 parts of regenerated red brick powder, 100-200 parts of fly ash, 90-110 parts of silica fume, 550-650 parts of natural sand, 450-550 parts of regenerated red brick sand, 40-50 parts of an additive, 160-180 parts of steel fiber and 170-190 parts of water. By adding the regenerated red brick powder, the compactness of the ultrahigh-performance concrete can be effectively improved, the cement consumption is greatly reduced, and the self-shrinkage of the ultrahigh-performance concrete is effectively reduced. The invention solves the problems of piling and abandoning the construction waste red bricks, processes the abandoned red bricks with the regenerated red brick powder and the regenerated red brick sand, solves the problem of resource utilization and improves the environmental protection benefit. Meanwhile, the invention solves the problems of large shrinkage, high energy consumption, high cost and poor environmental protection of the existing ultra-high performance concrete.
Detailed Description
The invention provides a low-carbon green ultra-high performance concrete which comprises the following preparation raw materials in parts by weight: 550-650 parts of cement, 250-350 parts of regenerated red brick powder, 100-200 parts of fly ash, 90-110 parts of silica fume, 550-650 parts of natural sand, 450-550 parts of regenerated red brick sand, 40-50 parts of an additive, 160-180 parts of steel fiber and 170-190 parts of water.
In the present invention, unless otherwise specified, the starting materials for the preparation are all commercially available products well known to those skilled in the art.
In the invention, the raw materials for preparing the low-carbon green ultra-high performance concrete comprise 550-650 parts by weight of cement, preferably 600-620 parts by weight of cement. In the present invention, the cement is preferably portland cement, and more preferably p.o42.5 portland cement. In the invention, P.O42.5 Portland cement is selected as the cement, and compared with P.O52.5 Portland cement, the hydration heat is smaller.
In the present invention, the cement is usedThe low-carbon green ultrahigh-performance concrete is prepared from 250-350 parts by weight of recycled red brick powder, preferably 250-300 parts by weight of recycled red brick powder. In the invention, the specific surface area of the regenerated red brick powder is preferably 900-1000 kg/m3More preferably 1000kg/m3(ii) a The 28-day activity index of the regenerated red brick powder is preferably 75-85%, and more preferably 85%; the median diameter (D50) of the regenerated red brick powder is preferably 8-10 μm, and more preferably 10 μm. According to the invention, the specific surface area of the regenerated red brick powder is optimized, so that the continuity of the grain composition of the whole cementing material system is realized, the average grain diameter of cement is 20-30 mu m, and the grains smaller than 10 mu m are few, therefore, the filling property among cement grains is not good. By adding the regenerated red brick powder, the compactness can be effectively improved, the cement consumption is greatly reduced, and the self-shrinkage of the ultrahigh-performance concrete is effectively reduced.
In the invention, the raw materials for preparing the regenerated red brick powder are preferably building garbage red bricks; the construction waste red brick preferably also comprises no more than 20 wt% of waste concrete.
In the present invention, the preparation method of the recycled red brick powder preferably comprises: removing soil from the red bricks of the construction waste to obtain red bricks after soil removal; sequentially carrying out primary crushing and secondary crushing on the red bricks after the soil is removed to obtain red bricks; and grinding the red brick blocks to obtain the regenerated red brick powder. In the present invention, the soil removing method is preferably a 10mm sieve. The invention preferably adopts a jaw crusher to carry out primary crushing on the red brick after soil removal. In the invention, the grain diameter of the red brick block obtained after the primary crushing is preferably less than or equal to 150mm, and more preferably 120 mm. The invention preferably adopts a hammering crusher to carry out secondary crushing. In the present invention, the particle size of the red brick obtained after the secondary crushing is preferably 70mm or less, more preferably 50 mm. The invention preferably adopts a ball mill or a horizontal shaft type single-bin tube mill for grinding.
In the invention, the raw materials for preparing the low-carbon green ultra-high performance concrete comprise 100-200 parts of fly ash, preferably 150-180 parts of fly ash based on the weight parts of the cement. In the present invention, the fly ash is preferably a class I fly ash. In the present invention, the average particle diameter of the fly ash is preferably 15 μm. In the invention, the fly ash has activity and can improve the strength of the ultra-high performance concrete.
In the invention, the raw materials for preparing the low-carbon green ultra-high performance concrete comprise 90-110 parts by weight of silica fume, preferably 100 parts by weight of cement. In the invention, SiO in the silica fume2Is preferably greater than 95% by mass.
In the invention, the raw materials for preparing the low-carbon green ultra-high performance concrete comprise 550-650 parts by weight of natural sand, preferably 600-620 parts by weight of cement. In the invention, the fineness modulus of the natural sand is preferably 2.3-2.5; the mud content is preferably less than or equal to 3.0 wt%; the content of mud lumps is preferably less than or equal to 1.0 wt%.
In the invention, the raw materials for preparing the low-carbon green ultra-high performance concrete comprise 450-550 parts by weight of regenerated red brick sand, preferably 500-520 parts by weight of cement. In the invention, the particle size of the regenerated red brick sand is preferably 0-5 mm, and more preferably 0.63-5 mm; the fineness modulus of the regenerated red brick sand is preferably 2.4-2.6, and more preferably 2.5; the content of the micro powder of the regenerated red brick sand is preferably 2.0-5.0 wt%, and more preferably 2.0 wt%; the apparent density of the regenerated red brick sand is preferably 2600-2650 kg/m3More preferably 2630kg/m3(ii) a The water demand ratio of the reclaimed rubber sand of the reclaimed red brick sand is preferably 2.0-2.1, and more preferably 2.05. In the invention, the regenerated red brick sand absorbs water at the early stage and retains water, and slowly releases water at the later stage, so as to provide water for the hydration of the cementing material at the later stage, play a role in internal curing and reduce the shrinkage of concrete.
In the invention, the raw materials for preparing the regenerated red brick sand are preferably building garbage red bricks; the construction waste red brick preferably also comprises no more than 20 wt% of waste concrete.
In the present invention, the preparation method of the recycled red brick sand preferably comprises: removing soil from the red bricks of the construction waste to obtain red bricks after soil removal; sequentially carrying out primary crushing and secondary crushing on the red bricks after the soil is removed to obtain red bricks; and screening the red brick blocks to obtain the regenerated red brick sand. In the present invention, the soil removing method is preferably a 10mm sieve. The invention preferably adopts a jaw crusher to carry out primary crushing on the red brick after soil removal. In the invention, the grain diameter of the red brick block obtained after the primary crushing is preferably less than or equal to 150mm, and more preferably 120 mm. The invention preferably adopts a hammering crusher to carry out secondary crushing. In the present invention, the particle size of the red brick obtained after the secondary crushing is preferably 70mm or less, more preferably 50 mm. The invention preferably adopts a vibrating screen with the aperture of 5mm for screening.
In the invention, the raw materials for preparing the low-carbon green ultra-high performance concrete comprise 40-50 parts by weight of additives, preferably 42-45 parts by weight of the cement. In the invention, the admixture is preferably a polycarboxylic acid high-performance water reducing agent. In the invention, the solid content of the polycarboxylic acid high-performance water reducing agent is preferably more than or equal to 35 wt%, and more preferably 40 wt%; the water reducing rate of the polycarboxylic acid high-performance water reducing agent is preferably more than or equal to 30 percent, and more preferably 35 percent.
In the invention, the raw materials for preparing the low-carbon green ultra-high performance concrete comprise 160-180 parts by weight of steel fiber, preferably 165-170 parts by weight of cement. In the present invention, the steel fiber is preferably a surface copper-plated steel fiber; the length-diameter ratio of the steel fiber is preferably 60-80, and more preferably 70. In a specific embodiment of the invention, the steel fiber is end hook RS70/8-3000 sold by Shanghai Zhen Qiang fiber, Inc. In the invention, the surface of the steel fiber plated with copper can passivate the surface of the steel fiber and prevent rusting.
In the invention, based on the weight parts of the cement, the preparation raw material of the low-carbon green ultrahigh-performance concrete comprises 170-190 parts of water, preferably 180 parts of water.
The invention also provides a preparation method of the low-carbon green ultra-high performance concrete, which comprises the following steps:
pre-wetting the regenerated red brick sand until the saturated surface is dry to obtain pre-wetted regenerated red brick sand;
mixing cement, fly ash, regenerated red brick powder, natural sand and silica fume to obtain a mixed dry material;
mixing the dry mixed material with water and an additive to obtain a wet mixed material;
mixing the mixed wet material with pre-wetted recycled red brick sand to obtain slurry;
and mixing the slurry with steel fibers to obtain the low-carbon green ultrahigh-performance concrete.
The invention adopts the charging sequence to improve the stirring uniformity under the condition of shortening the stirring time.
The invention mixes cement, fly ash, regenerated red brick powder, natural sand and silica fume to obtain a mixed dry material. In the present invention, the mixing is preferably performed under stirring conditions; the stirring time is preferably 120 s.
After the dry mixed material is obtained, the dry mixed material is mixed with water and an additive to obtain a wet mixed material. In the present invention, the mixing is preferably performed under stirring conditions; the stirring time is preferably 180 s.
The method pre-wets the recycled red brick sand until the saturated surface is dry, so as to obtain the pre-wetted recycled red brick sand. In the invention, the pre-wet state to the saturated dry state is preferably in the GB/T14684-2011 construction sand standard.
After the mixed wet material and the pre-wet regeneration red brick sand are obtained, the mixed wet material and the pre-wet regeneration red brick sand are mixed to obtain slurry. In the present invention, the mixing is preferably performed under stirring conditions; the stirring time is preferably 120 s.
After the slurry is obtained, the low-carbon green ultrahigh-performance concrete is obtained by mixing the slurry and the steel fibers. In the present invention, the mixing of the slurry and the steel fibers preferably comprises: the steel fibers were continuously and uniformly added to the slurry. In the present invention, the mixing is preferably performed under stirring conditions; the stirring time is preferably 60 s. According to the invention, the steel fibers are wrapped by the slurry and uniformly distributed by stirring.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The examples and comparative examples used the following preparation starting materials:
the cement is P.O42.5 ordinary portland cement.
The specific surface area of the regenerated red brick powder is 1000kg/m328D Activity index 85%, D50 10 μm. The preparation method of the regenerated red brick powder comprises the following steps: sieving the large red bricks of the construction waste by a sieve of 10mm, and removing soil; carrying out primary crushing on the red bricks after soil removal by adopting a jaw crusher to obtain red brick blocks with the particle size of less than or equal to 150 mm; carrying out secondary crushing on the red brick blocks subjected to primary crushing by adopting a hammering crusher to obtain red brick blocks with the particle size of less than or equal to 70 mm; and grinding the red brick blocks crushed in the second stage by adopting a ball mill or a horizontal shaft type single-bin tube mill to obtain the regenerated red brick powder.
The fly ash is I-grade fly ash, and the average particle size is 15 mu m.
SiO in silica fume2The mass content of (b) is 96%.
The fineness modulus of the natural sand is 2.3, the mud content is 2.4wt percent), and the mud block content is 0.4wt percent.
The particle diameter of the regenerated red brick sand is 0.63-5 mm, the fineness modulus is 2.5, the content of micro powder is 2.0 wt%, and the apparent density is 2630kg/m3The water demand ratio of the reclaimed rubber sand is 2.05. The preparation method of the regenerated red brick sand comprises the following steps: sieving the large red bricks of the construction waste by a sieve of 10mm, and removing soil; carrying out primary crushing on the red bricks after soil removal by adopting a jaw crusher to obtain red brick blocks with the particle size of less than or equal to 150 mm; carrying out secondary crushing on the red brick blocks subjected to primary crushing by adopting a hammering crusher to obtain red brick blocks with the particle size of less than or equal to 70 mm; and (4) sieving the red brick blocks crushed in the second stage by a vibrating screen with the aperture of 5mm to obtain the regenerated red brick sand.
The solid content of the polycarboxylic acid high-performance water reducing agent is 40 wt%, and the water reducing rate is 35%.
The steel fiber is copper-plated steel fiber with the surface length-diameter ratio of 70, and is sold by Shanghai Zhen Qiang fiber company as end hook RS 70/8-3000.
Example 1
The low-carbon green ultrahigh-performance concrete is prepared from the following raw materials in parts by weight:
650 parts of ordinary portland cement, 250 parts of regenerated red brick powder, 100 parts of fly ash, 100 parts of silica fume, 650 parts of natural sand, 450 parts of regenerated red brick sand, 180 parts of steel fiber, 45 parts of polycarboxylic acid high-performance water reducing agent and 180 parts of water.
The preparation method comprises the following steps:
pre-wetting the regenerated red brick sand to a saturated surface and drying to obtain pre-wetted regenerated red brick sand; adding cement, fly ash, regenerated red brick powder, natural sand and silica fume into a forced mixer, and dry-stirring for 120s to obtain a mixed dry material; uniformly adding water and a polycarboxylic acid high-performance water reducing agent into the dry mixed material, and stirring for 180s to obtain a wet mixed material; slowly adding pre-wetted regenerated red brick sand into the mixed wet material, and stirring for 120s to obtain slurry; and slowly adding steel fibers into the slurry, and stirring for 60s to obtain the low-carbon green ultrahigh-performance concrete.
Example 2
The low-carbon green ultrahigh-performance concrete is prepared from the following raw materials in parts by weight:
550 parts of ordinary portland cement, 350 parts of regenerated red brick powder, 100 parts of fly ash, 100 parts of silica fume, 650 parts of natural sand, 450 parts of regenerated red brick sand, 180 parts of steel fiber, 45 parts of polycarboxylic acid high-performance water reducing agent and 180 parts of water.
The preparation method comprises the following steps:
pre-wetting the regenerated red brick sand to a saturated surface and drying to obtain pre-wetted regenerated red brick sand; adding cement, fly ash, regenerated red brick powder, natural sand and silica fume into a forced mixer, and dry-stirring for 120s to obtain a mixed dry material; uniformly adding water and a polycarboxylic acid high-performance water reducing agent into the dry mixed material, and stirring for 180s to obtain a wet mixed material; slowly adding pre-wetted regenerated red brick sand into the mixed wet material, and stirring for 120s to obtain slurry; and slowly adding steel fibers into the slurry, and stirring for 60s to obtain the low-carbon green ultrahigh-performance concrete.
Example 3
The low-carbon green ultrahigh-performance concrete is prepared from the following raw materials in parts by weight:
650 parts of ordinary portland cement, 250 parts of regenerated red brick powder, 100 parts of fly ash, 100 parts of silica fume, 600 parts of natural sand, 500 parts of regenerated red brick sand, 180 parts of steel fiber, 45 parts of polycarboxylic acid high-performance water reducing agent and 180 parts of water.
The preparation method comprises the following steps:
pre-wetting the regenerated red brick sand to a saturated surface and drying to obtain pre-wetted regenerated red brick sand; adding cement, fly ash, regenerated red brick powder, natural sand and silica fume into a forced mixer, and dry-stirring for 120s to obtain a mixed dry material; uniformly adding water and a polycarboxylic acid high-performance water reducing agent into the dry mixed material, and stirring for 180s to obtain a wet mixed material; slowly adding pre-wetted regenerated red brick sand into the mixed wet material, and stirring for 120s to obtain slurry; and slowly adding steel fibers into the slurry, and stirring for 60s to obtain the low-carbon green ultrahigh-performance concrete.
Example 4
The low-carbon green ultrahigh-performance concrete is prepared from the following raw materials in parts by weight:
650 parts of ordinary portland cement, 250 parts of regenerated red brick powder, 100 parts of fly ash, 100 parts of silica fume, 550 parts of natural sand, 550 parts of regenerated red brick sand, 180 parts of steel fiber, 45 parts of polycarboxylic acid high-performance water reducing agent and 180 parts of water.
The preparation method comprises the following steps:
pre-wetting the regenerated red brick sand to a saturated surface and drying to obtain pre-wetted regenerated red brick sand; adding cement, fly ash, regenerated red brick powder, natural sand and silica fume into a forced mixer, and dry-stirring for 120s to obtain a mixed dry material; uniformly adding water and a polycarboxylic acid high-performance water reducing agent into the dry mixed material, and stirring for 180s to obtain a wet mixed material; slowly adding pre-wetted regenerated red brick sand into the mixed wet material, and stirring for 120s to obtain slurry; and slowly adding steel fibers into the slurry, and stirring for 60s to obtain the low-carbon green ultrahigh-performance concrete.
Comparative example 1
The ultra-high performance concrete of the comparative example is prepared from the following raw materials in parts by weight:
800 parts of ordinary portland cement, 200 parts of fly ash, 100 parts of silica fume, 1100 parts of natural sand, 180 parts of steel fiber, 45 parts of polycarboxylic acid high-performance water reducing agent and 180 parts of water.
The preparation method comprises the following steps:
adding cement, fly ash, natural sand and silica fume into a forced mixer, and carrying out dry mixing for 120s to obtain a mixed dry material; uniformly adding water and a polycarboxylic acid high-performance water reducing agent into the dry mixed material, and stirring for 180s to obtain a wet mixed material; and slowly adding steel fibers into the mixed wet material, and stirring for 60s to obtain the low-carbon green ultrahigh-performance concrete.
Comparative example 2
The ultra-high performance concrete of the comparative example is prepared from the following raw materials in parts by weight:
650 parts of ordinary portland cement, 250 parts of regenerated red brick powder, 100 parts of fly ash, 100 parts of silica fume, 1100 parts of natural sand, 180 parts of steel fiber, 45 parts of polycarboxylic acid high-performance water reducing agent and 180 parts of water.
The preparation method comprises the following steps:
adding cement, fly ash, regenerated red brick powder, natural sand and silica fume into a forced mixer, and dry-stirring for 120s to obtain a mixed dry material; uniformly adding water and a polycarboxylic acid high-performance water reducing agent into the dry mixed material, and stirring for 180s to obtain a wet mixed material; and slowly adding steel fibers into the mixed wet material, and stirring for 60s to obtain the low-carbon green ultrahigh-performance concrete.
Test example
The results of the performance tests of the ultra-high performance concrete prepared in examples 1 to 4 and comparative examples 1 to 2 are shown in table 1. The detection standard is GB/T50082-2009 Standard for testing the long-term performance and the durability of common concrete; GB/T50081-2019 Standard of concrete physical and mechanical property test method.
TABLE 1 Properties of ultra high Performance concrete prepared in examples 1 to 4 and comparative examples 1 to 2
| Numbering | Flexural strength/MPa | Compressive strength/MPa | 3d shrinkage/. mu.epsilon | 60d shrinkage/μ ε |
| Comparative example 1 | 26.9 | 148.2 | 1215 | 618 |
| Comparative example 2 | 25.6 | 145.6 | 1098 | 509 |
| Example 1 | 25.3 | 141.6 | 915 | 365 |
| Example 2 | 23.5 | 135.2 | 890 | 283 |
| Example 3 | 26.1 | 144.2 | 812 | 212 |
| Example 4 | 24.2 | 138.7 | 735 | 188 |
As can be seen from Table 1, the material characteristics of the conventional ultrahigh-performance concrete endow the concrete with excellent performance and cause the phenomenon of serious self-shrinkage, the water-cement ratio of the concrete is extremely low, the content of the cementing material is high, the hydration reaction is severe, a large amount of water in capillary pores is consumed in a short time, the obvious self-drying effect and the capillary negative pressure generated therewith are caused, and the concrete macroscopically shows obvious volume self-shrinkage deformation. The self-contraction phenomenon is easy to generate larger tensile stress and microcracks in the body of the ultra-high performance concrete member under the condition that the ultra-high performance concrete member is limited, and further brings adverse effects to the whole concrete structure.
The low-carbon green ultrahigh-performance concrete prepared by the invention has the advantage that the early (3d) shrinkage rate of the concrete is gradually reduced along with the increase of the mixing amount of the regenerated red brick powder, because the regenerated red brick powder replaces part of cement, the chemical shrinkage generated by early hydration reaction of the cement is reduced, the compressive strength and the flexural strength are slightly reduced, but the compressive strength is over 120MPa, and the flexural strength is over 20 MPa. And secondly, along with the increase of the mixing amount of the recycled red brick sand, the shrinkage rate of the concrete at the later period (60d) is obviously reduced, because the pre-wet recycled red brick sand has an internal curing effect, and the self-drying shrinkage of the concrete can be obviously reduced. The recycled red brick powder and the recycled red brick sand in the low-carbon green ultrahigh-performance concrete have larger mixing amount, so that the cost of the single concrete is reduced, a new way is provided for the application of the construction waste recycled material, and good economic, environmental-friendly and social benefits are achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The low-carbon green ultra-high performance concrete comprises the following preparation raw materials in parts by weight: 550-650 parts of cement, 250-350 parts of regenerated red brick powder, 100-200 parts of fly ash, 90-110 parts of silica fume, 550-650 parts of natural sand, 450-550 parts of regenerated red brick sand, 40-50 parts of an additive, 160-180 parts of steel fiber and 170-190 parts of water.
2. The low-carbon green ultra-high performance concrete according to claim 1, wherein the specific surface area of the regenerated red brick powder is 900-1000 kg/m3(ii) a The activity index in 28 days is 75-85%; the median diameter of the regenerated red brick powder is 8-10 mu m.
3. The method for preparing the recycled red brick powder according to the claim 1 or 2, wherein the method for preparing the recycled red brick powder comprises the following steps:
removing soil from the red bricks of the construction waste to obtain red bricks after soil removal;
sequentially carrying out primary crushing and secondary crushing on the red bricks after the soil is removed to obtain red bricks;
and grinding the red brick blocks to obtain the regenerated red brick powder.
4. The low-carbon green ultra-high performance concrete according to claim 1, wherein the particle size of the regenerated red brick sand is 0-5 mm.
5. The low-carbon green ultra-high performance concrete according to claim 1 or 4, wherein the preparation method of the recycled red brick sand comprises the following steps:
removing soil from the red bricks of the construction waste to obtain red bricks after soil removal;
sequentially carrying out primary crushing and secondary crushing on the red bricks after the soil is removed to obtain red bricks;
and screening the red brick blocks to obtain the regenerated red brick sand.
6. The low-carbon green ultra-high performance concrete according to claim 1, wherein the fly ash is class I fly ash.
7. The low-carbon green ultrahigh-performance concrete as claimed in claim 1, wherein the additive is a polycarboxylic acid high-performance water reducing agent.
8. The low-carbon green ultra-high performance concrete according to claim 1, wherein the fineness modulus of the natural sand is 2.3-2.5; the mud content is less than or equal to 3.0 wt%; the content of mud blocks is less than or equal to 1.0 wt%.
9. The low-carbon green ultra-high performance concrete according to claim 1, wherein the steel fibers are surface copper-plated steel fibers.
10. The preparation method of the low-carbon green ultra-high performance concrete as claimed in any one of claims 1 to 9, comprising the following steps:
pre-wetting the regenerated red brick sand until the saturated surface is dry to obtain pre-wetted regenerated red brick sand;
mixing cement, fly ash, regenerated red brick powder, natural sand and silica fume to obtain a mixed dry material;
mixing the dry mixed material with water and an additive to obtain a wet mixed material;
mixing the mixed wet material with pre-wetted recycled red brick sand to obtain slurry;
and mixing the slurry with steel fibers to obtain the low-carbon green ultrahigh-performance concrete.
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