CN114804774A - Ultra-high performance concrete based on waste brick regenerated micro powder and preparation method thereof - Google Patents
Ultra-high performance concrete based on waste brick regenerated micro powder and preparation method thereof Download PDFInfo
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- CN114804774A CN114804774A CN202210512591.5A CN202210512591A CN114804774A CN 114804774 A CN114804774 A CN 114804774A CN 202210512591 A CN202210512591 A CN 202210512591A CN 114804774 A CN114804774 A CN 114804774A
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- 239000002699 waste material Substances 0.000 title claims abstract description 61
- 239000011449 brick Substances 0.000 title claims abstract description 55
- 239000000843 powder Substances 0.000 title claims abstract description 52
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 157
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 239000011398 Portland cement Substances 0.000 claims abstract description 24
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 22
- 239000002253 acid Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000004576 sand Substances 0.000 claims description 18
- 239000011268 mixed slurry Substances 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 12
- 239000004927 clay Substances 0.000 claims description 11
- 239000003125 aqueous solvent Substances 0.000 claims description 10
- 238000000498 ball milling Methods 0.000 claims description 8
- 238000007790 scraping Methods 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 235000020188 drinking water Nutrition 0.000 claims description 3
- 239000003651 drinking water Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 26
- 239000000463 material Substances 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 239000012467 final product Substances 0.000 abstract 1
- 239000003292 glue Substances 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 10
- 239000011083 cement mortar Substances 0.000 description 7
- 239000011372 high-strength concrete Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 5
- 238000011069 regeneration method Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000009440 infrastructure construction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000007780 powder milling Methods 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an ultra-high performance concrete based on waste brick regenerated micro powder and a preparation method thereof, wherein the concrete comprises the following raw materials in parts by weight: 977 parts of portland cement, 134.34-207.61 parts of silica fume, 36.64-109.91 parts of waste brick regenerated micro powder, 801.14 parts of fine aggregate, 37.13-41.64 parts of polycarboxylic acid water reducing agent and 195.41 parts of water. The waste brick-doped recycled micro powder can improve the compressive strength and the bending strength of the ultra-high performance concrete and can effectively reduce the risk of self-shrinkage cracking of the concrete. Meanwhile, the waste utilization is realized, and the material cost and the carbon emission are effectively reduced. The invention utilizes the counter-flow principle or the transverse flow principle and adopts a rotary mixing stirrer, has unexpected advantages for the mixing of raw materials, especially for the mixing of a mixture with low water-glue ratio, and can greatly improve the performance of a final product.
Description
Technical Field
The invention relates to an ultra-high performance concrete based on waste brick regenerated micro powder and a preparation method thereof, belonging to the technical field of ultra-high strength concrete.
Background
With the implementation of development strategies in coastal high-salt areas, northeast high-cold areas and northwest high-drought areas in China, the infrastructure construction requires that the concrete structure has the characteristics of high strength and high durability. The traditional concrete material has low strength and poor durability, obviously cannot meet the requirement of infrastructure construction, so more and more domestic and foreign scholars begin to research the concrete material with ultrahigh performance. The ultra-high performance concrete has the characteristics of high strength, good impermeability, excellent durability and workability and the like, but the used binder content is high, and the concrete is easy to shrink and crack. Meanwhile, even for the ultra-high performance concrete hydrated for a long time, unhydrated gelling components still exist in the ultra-high performance concrete, which indicates that the gelling components such as cement, silica fume and the like are excessive and are easy to cause the problems of shrinkage cracking and the like. With the rapid development of economic construction and the increasingly accelerated urbanization process in China, old buildings need to be dismantled and rebuilt urgently, so that a large amount of construction waste is generated, and the waste clay bricks are not lacked. Therefore, in order to meet the requirements of the green sustainable development strategy, realize the sustainable development of the concrete industry and reduce the risk of cracking of the ultra-high performance concrete due to shrinkage, a feasible strategy is provided by replacing the gelling component in the ultra-high performance concrete with a small amount of regenerated micro powder.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical problems, the first purpose of the invention is to provide an ultra-high performance concrete based on recycled micro powder of waste bricks, and the second purpose of the invention is to provide a preparation method of the ultra-high performance concrete.
The technical scheme is as follows: the waste brick regenerated micro powder-based ultrahigh-performance concrete is prepared from 977 parts by weight of portland cement, 134.34-207.61 parts by weight of silica fume, 36.64-109.91 parts by weight of waste brick regenerated micro powder, 801.14 parts by weight of fine aggregate, 37.13-41.64 parts by weight of polycarboxylic acid water reducer and 195.41 parts by weight of water.
Preferably, the portland cement is PII 52.5R-grade ordinary portland cement with the specific surface area of 350.0-355.0m 2 Per kg, the average particle diameter is 17.50-18.00 mu m.
Preferably, SiO in the silica fume 2 The content is more than or equal to 95 percent, and the SiO 2 Has a specific surface area of 20-25m 2 /g，SiO 2 Has an average particle diameter of 0.15 to 0.25. mu.m.
Preferably, the fine aggregate is standard sand which is sand in the area II, and the mud content in the fine aggregate is less than or equal to 0.5 percent.
Preferably, the waste brick regenerated micro powder is obtained by crushing and ball-milling clay bricks in a disassembled building.
More preferably, the waste brick regenerated micro powder is prepared by the following steps: classifying and collecting waste clay bricks in construction waste according to particle sizes, crushing the waste clay bricks with the particle sizes of more than or equal to 10mm to obtain brick aggregates, drying the crushed brick aggregates, ball-milling the dried brick aggregates and the waste clay bricks with the particle sizes of less than or equal to 10mm into fine powder, and ball-milling the fine powder to obtain micro powder, namely the recycled micro powder of the waste bricks.
More preferably, the grain size of the brick aggregate is less than or equal to 10 mm.
More preferably, the particle size of the fine powder is 150 μm or less.
More preferably, a low speed ball mill is used for ball milling into fine powder.
More preferably, the ball milling into a fine powder is performed using a planetary ball mill.
Preferably, the micro powder d 50 ＜9.8mm。
Preferably, the main element composition of the waste brick regenerated micro powder is Si, Al and O, namely the main chemical component is SiO 2 And Al 2 O 3 With only a small amount of CaO, the 28-day activity index was 83.4%.
Preferably, the solid content of the polycarboxylic acid water reducing agent is 25-30%, and the water reducing rate is 20-25%.
Preferably, the water is tap water or drinking water. It meets the requirements of the Water Standard for concrete (JGJ 63-2006).
The invention also comprises a preparation method of the ultra-high performance concrete based on the waste brick regenerated micro powder, which comprises the following steps:
(1) taking portland cement, silica fume, waste brick regenerated micro powder and fine aggregate, and stirring and mixing by using a rotary mixing stirrer to obtain a mixture;
(2) adding a polycarboxylic acid water reducing agent into water, stirring to obtain an aqueous solvent, adding the aqueous solvent into the mixture, and stirring and mixing to obtain mixed slurry;
(3) and scraping off slurry attached to the wall of the stirrer by using a multifunctional tool with a fixed position on the rotary mixing stirrer to mix with the mixed slurry, and continuously stirring and mixing to obtain the ultra-high performance concrete based on the waste brick regenerated micro powder.
Preferably, in the step (1), the rotation speed of the rotor of the rotary mixing stirrer is 130-170r/min, the rotation speed of the mixing container of the rotary mixing stirrer is 20-40r/min, the rotation direction of the rotor of the rotary mixing stirrer and the rotation direction of the mixing container are opposite, and the stirring and mixing time is 100-140 s.
Preferably, in the step (2), the rotation speed of the rotor of the rotary mixing agitator is 280-320r/min, the rotation speed of the mixing container of the rotary mixing agitator is 20-40r/min, the rotation direction of the rotor of the rotary mixing agitator and the mixing container is opposite, and the time for mixing and agitating is 300-420 s.
Preferably, in step (3), the rotation speed of the rotor of the rotary mixing agitator is 280- > 320r/min, the rotation speed of the mixing container of the rotary mixing agitator is 20-40r/min, the rotation direction of the rotor of the rotary mixing agitator and the rotation direction of the mixing container are opposite, and the time for continuing agitating and mixing is 100- > 140 s.
More preferably, before step (1), the rotary mixer and the container for containing the concrete are fully wetted with cement mortar having the same water-cement ratio (ratio of water to binder (portland cement + recycled brick micropowder + silica fume)) as that of the ultra-high strength concrete.
The rotary mixing stirrer is designed according to a countercurrent principle or a transverse flow principle, is provided with a rotary mixing container which is obliquely installed, and sends materials to be mixed to an eccentrically installed high-speed rotary mixing tool part, a rotor and the mixing container can realize opposite or reverse relative rotation, the rotating speed can be adjusted in real time according to requirements to form an inverse mixture flow with high speed difference, and therefore the materials are uniformly mixed to the maximum extent.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) the raw materials of the invention comprise the waste brick recycled micro powder prepared by using waste clay bricks with different proportions and replace part of silica fume to prepare the ultra-high performance concrete, thereby effectively reducing the self-contraction deformation of the ultra-high performance concrete and effectively reducing the preparation cost and the environmental load of the ultra-high performance concrete on the basis of keeping the strength of the concrete unchanged.
(2) The preparation method adopts a rotary mixing stirrer to send the materials to be mixed to an eccentrically-arranged high-speed rotary mixing tool part, a rotor and a mixing container can realize opposite or reverse relative rotation, the rotating speed can be adjusted in real time according to requirements to form an inverse mixture flow with a very high speed difference, the obliquely-arranged rotary mixing container and a multifunctional tool with a fixed position are arranged together to ensure that the mixture flow forms a strong vertical component and ensure that the mixed materials are fully and uniformly mixed, and the multifunctional tool can reliably prevent the mixture from being attached to the bottom and the wall of the mixing container and accelerate the discharging when the mixing time is over. The mixing mode has unexpected advantages for the mixing of raw materials, especially for cement-based materials with low water-cement ratio, and can greatly improve the performance of final products.
Detailed Description
The technical scheme of the invention is further explained,
The raw materials and equipment used in the following examples are all as follows:
the ultra-high strength concrete of the invention is concrete with the strength grade of 100MPa or above.
The Portland cement is PII 52.5R-grade ordinary Portland cement, and the specific surface area of the Portland cement is 352.2m 2 Per kg, the average particle diameter was 17.98. mu.m. .
SiO in silica fume 2 The content is more than or equal to 95 percent, and SiO is 2 Has a specific surface area of 24m 2 /g，SiO 2 Has an average particle diameter of 0.2. mu.m.
The fine aggregate is standard sand which is sand in the area II, and the mud content in the standard sand is less than or equal to 0.5 percent;
the waste-to-recycled micro powder is obtained by crushing and ball-milling waste clay bricks in a disassembled building, and the specific process comprises the following steps: firstly, waste clay bricks in construction waste are screened and collected according to particle sizes. Then, the waste clay bricks with the particle size of more than 10mm are crushed into brick aggregates by using a crusher. Then, drying the brick aggregate with the particle size of less than or equal to 10mm and the waste clay brick with the particle size of less than or equal to 10mm, grinding the dried brick aggregate for 60min by a ball mill, and grinding into fine powder, wherein the maximum particle size of the fine powder is 150 mu m. Finally, ball milling the fine powder obtained in the previous step and the collected undisturbed fine powder for 30min in a planetary ball mill to obtain d 50 9.8mm of micropowder, namely the waste regenerated micropowder. The main element composition of the waste to regenerated micro powder is Si, Al and O, namely the main chemical component is SiO 2 And Al 2 O 3 With only a small amount of CaO, the 28-day activity index was 83.4%.
The solid content of the polycarboxylic acid high-efficiency water reducing agent is 28 percent, and the water reducing rate is 25 percent.
The water is tap water or drinking water, and meets the requirements of concrete water standards (JGJ 63-2006).
The stirrer used was a rotary mixer (Aili-licensed R-type intensive mixer).
The preparation method of the ultra-high performance concrete comprises the following steps:
the rotary mixer and the container for holding concrete are first wetted fully with cement mortar in the same water-cement ratio as that of superhigh strength concrete.
(1) Sequentially adding the weighed Portland cement, silica fume, waste rotary regeneration micro powder and river sand into a mixing container of a rotary mixing stirrer, covering the container of the rotary mixing stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 130-170r/min, the clockwise rotation speed of the mixing container is 20-40r/min, and the rotation directions of the rotor and the mixing container are opposite. The stirring and mixing time is 100-140S, so that the mixture is obtained after the mixture is uniformly stirred and mixed;
(2) and adding the weighed polycarboxylic acid water reducing agent into water, and stirring the mixture for several seconds by using a glass rod to obtain a uniform water solvent. Slowly adding the uniformly stirred aqueous solvent into the mixture from a water filling port of the rotary mixing stirrer, then adjusting the speed of a rotor, wherein the anticlockwise rotation speed of the rotor is 280-320r/min, the clockwise rotation speed of a mixing container is 20-40r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 300-420S, so as to obtain uniformly mixed slurry;
(3) stopping the rotor and the mixing container, scraping off slurry attached to the wall of the stirrer by using a multifunctional tool fixed in position on the rotary mixing stirrer, mixing with the mixed slurry, restarting the rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 280-140 r/min, the clockwise rotation speed of the mixing container is 20-40r/min, the rotation directions of the rotor and the mixing container are opposite, and continuously stirring and mixing for 100-140S, so that the ultrahigh-performance concrete based on the recycled micro powder of the waste bricks can be obtained.
Example 1
The following raw material components are taken according to parts by weight: 977 parts of Portland cement, 207.61 parts of silica fume, 36.64 parts of waste regenerated micro powder, 801.14 parts of standard sand, 40.06 parts of polycarboxylic acid water reducing agent and 195.41 parts of water.
The ultra-high performance concrete is prepared according to the preparation method
The mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed Portland cement, silica fume, waste rotary regeneration micro powder and standard sand into a mixing container of a rotary mixing stirrer, covering the container of the rotary mixing stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 170r/min, the clockwise rotation speed of the mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 140 seconds, so that the mixture is uniformly stirred and mixed to obtain a mixture;
(2) and adding the weighed polycarboxylic acid water reducing agent into water, and stirring for 10s by using a glass rod to obtain a uniform water solvent. Slowly adding the uniformly stirred aqueous solvent into the mixture from the water filling port, then adjusting the speed of the rotor, wherein the anticlockwise rotation speed of the rotor is 320r/min, the clockwise rotation speed of the mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 360S, so that uniformly mixed slurry is obtained.
(3) Stopping the rotor and the mixing container, scraping off slurry attached to the wall of the stirrer by using a multifunctional tool fixed in position on the rotary mixing stirrer, mixing the slurry with the mixed slurry, restarting the rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 420r/min, the clockwise rotation speed of the mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and the continuous stirring and mixing time is 140 seconds, so that the ultrahigh-performance concrete based on the recycled micro powder of the waste bricks can be obtained.
Example 2
The following raw material components are taken according to parts by weight: 977 parts of Portland cement, 170.98 parts of silica fume, 73.28 parts of waste regenerated micro powder, 801.14 parts of standard sand, 39.08 parts of polycarboxylic acid water reducing agent and 195.41 parts of water.
Preparing the ultra-high performance concrete according to the preparation method:
the mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed Portland cement, silica fume, waste rotary regeneration micro powder and standard sand into a mixing container of a rotary mixing stirrer, covering the container of the rotary mixing stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 150r/min, the clockwise rotation speed of the mixing container is 30r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 120S, so that the mixture is uniformly stirred and mixed to obtain a mixture;
(2) and adding the weighed polycarboxylic acid water reducing agent into water, and stirring for 10 seconds by using a glass rod to obtain a uniform water solvent. Slowly adding the uniformly stirred aqueous solvent into the mixture from a water filling port, then adjusting the speed of a rotor, wherein the anticlockwise rotation speed of the rotor is 300r/min, the clockwise rotation speed of a mixing container is 30r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 360S to obtain uniformly mixed slurry;
(3) stopping the rotor and the mixing container, scraping off slurry attached to the wall of the stirrer by using a multifunctional tool fixed in position on the rotary mixing stirrer, mixing the slurry with the mixed slurry, restarting the rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 300r/min, the clockwise rotation speed of the mixing container is 30r/min, the rotation directions of the rotor and the mixing container are opposite, and continuously stirring and mixing for 120S to obtain the ultra-high performance concrete based on the recycled micro powder of the waste bricks.
Example 3
The following raw material components are taken according to parts by weight: 977 parts of portland cement, 134.34 parts of silica fume, 109.91 parts of waste regenerated micro powder, 801.14 parts of standard sand, 37.13 parts of polycarboxylic acid water reducing agent and 195.41 parts of water.
Preparing the ultra-high performance concrete according to the preparation method:
the mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed Portland cement, silica fume, waste rotary regeneration micro powder and standard sand into a mixing container of a rotary mixing stirrer, covering the container of the rotary mixing stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 170r/min, the clockwise rotation speed of the mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 140 seconds, so that the mixture is uniformly stirred and mixed to obtain a mixture;
(2) and adding the weighed polycarboxylic acid water reducing agent into water, and stirring for 10 seconds by using a glass rod to obtain a uniform water solvent. Slowly adding the uniformly stirred aqueous solvent into the mixture from the water filling port, then adjusting the speed of the rotor, wherein the anticlockwise rotation speed of the rotor is 320r/min, the clockwise rotation speed of the mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 360S, so that uniformly mixed slurry is obtained.
(3) Stopping the rotor and the mixing container, scraping off slurry attached to the wall of the mixer by using a multifunctional tool fixed in position on the rotary mixing mixer, mixing the slurry with the mixed slurry, restarting the rotor and the mixing container, controlling the anticlockwise rotation speed of the rotor to be 420r/min, controlling the clockwise rotation speed of the mixing container to be 40r/min, controlling the rotation directions of the rotor and the mixing container to be opposite, and continuously stirring and mixing for 140S to obtain the ultra-high performance concrete based on the recycled micro powder of the waste bricks.
Example 4
The following raw material components are taken according to parts by weight: 977 parts of Portland cement, 207.61 parts of silica fume, 36.64 parts of waste regenerated micro powder, 801.14 parts of standard sand, 40.06 parts of polycarboxylic acid water reducing agent and 195.41 parts of water.
The ultra-high performance concrete is prepared according to the preparation method
The mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed Portland cement, silica fume, waste rotary regeneration micro powder and standard sand into a mixing container of a rotary mixing stirrer, covering the container of the rotary mixing stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 130r/min, the clockwise rotation speed of the mixing container is 20r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 100S, so that the mixture is uniformly stirred and mixed to obtain a mixture;
(2) and adding the weighed polycarboxylate superplasticizer into water, and stirring for 10 seconds by using a glass rod to obtain a uniform water solvent. Slowly adding the uniformly stirred aqueous solvent into the mixture from the water filling port, then adjusting the speed of the rotor, wherein the anticlockwise rotation speed of the rotor is 280r/min, the clockwise rotation speed of the mixing container is 20r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 300S, so as to obtain uniformly mixed slurry.
(3) Stopping the rotor and the mixing container, scraping off slurry attached to the wall of the stirrer by using a multifunctional tool fixed in position on the rotary mixing stirrer, mixing the slurry with the mixed slurry, restarting the rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 280r/min, the clockwise rotation speed of the mixing container is 20r/min, the rotation directions of the rotor and the mixing container are opposite, and continuously stirring and mixing for 100S to obtain the ultra-high performance concrete based on the recycled micro powder of the waste bricks.
Comparative example 1:
the following raw material components are taken according to parts by weight: 977 parts of portland cement, 244.25 parts of silica fume, 801.14 parts of standard sand, 37.13 parts of polycarboxylic acid water reducing agent and 195.41 parts of water.
The concrete was prepared according to the preparation method described above:
the mixer and the container for concrete are fully wetted by cement mortar with the same water-cement ratio as that of concrete.
(1) And sequentially adding the weighed Portland cement, silica fume and standard sand into a mixing container of a rotary mixing stirrer, covering the container of the rotary mixing stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 170r/min, the clockwise rotation speed of the mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 140 seconds, so that the mixture is uniformly stirred and mixed to obtain a mixture.
(2) And adding the weighed polycarboxylic acid water reducing agent into water, and stirring for 10 seconds by using a glass rod to obtain a uniform water solvent. Slowly adding the uniformly stirred aqueous solvent into the mixture from the water filling port, then adjusting the speed of the rotor, wherein the anticlockwise rotation speed of the rotor is 320r/min, the clockwise rotation speed of the mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and the stirring and mixing time is 360S, so as to obtain uniformly mixed slurry.
(3) Stopping the rotor and the mixing container, scraping off slurry attached to the wall of the mixer by using a multifunctional tool fixed in position on the rotary mixing mixer, mixing with the mixed slurry, restarting the rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 420r/min, the clockwise rotation speed of the mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and continuously stirring and mixing for 140 seconds to obtain the ultra-high performance concrete.
Comparative example 2:
the difference from example 1 is that the preparation method does not use the rotary mixer, but uses a forced single horizontal shaft concrete mixer.
And (3) performance detection:
the concrete obtained in comparative examples 1-2 of grades 1-3 of examples was formed by vibration according to national standards and cured in a standard curing room for 28 days and 60 days, respectively. The hardened concrete properties of examples 1 to 3 and comparative examples 1 to 2 were tested, and the results are shown in Table 1.
TABLE 1 test results
As can be seen from the results in Table 1, compared with comparative example 1, that is, compared with the concrete not doped with the recycled micropowder of the waste brick, after the recycled micropowder of the waste brick is added in a small amount (as in example 1), the 28-day compressive strength, 28-day bending strength, 60-day compressive strength and 60-day bending strength of the product are all significantly improved; however, as the content of the recycled fine powder of the waste bricks is further increased (examples 2 and 3), the 28-day compressive strength, 28-day flexural strength, 60-day compressive strength and 60-day flexural strength of the product are reduced, but the reduction range is not large. The self-shrinkage deformation of the concrete is effectively reduced by applying the waste brick recycled micro powder in the ultra-high performance concrete, and the self-shrinkage deformation is gradually reduced along with the increase of the mixing amount of the recycled micro powder. In addition, compared with comparative example 2, namely compared with the conventional mixing method, the 28-day compressive strength, the 28-day bending strength, the 60-day compressive strength and the 60-day bending strength of the product of the invention are all obviously improved, but the self-contraction deformation of the product is also obviously increased.
Claims (10)
1. The ultra-high performance concrete based on the waste brick regenerated micro powder is characterized by being prepared from the following raw materials in parts by weight: 977 parts of portland cement, 134.34-207.61 parts of silica fume, 36.64-109.91 parts of waste brick regenerated micro powder, 801.14 parts of fine aggregate, 37.13-41.64 parts of polycarboxylic acid water reducing agent and 195.41 parts of water.
2. The ultra-high performance concrete based on recycled micropowder of waste bricks as claimed in claim 1, wherein the portland cement is PII-52.5R grade ordinary portland cement with specific surface area of 350.0-355.0m 2 Per kg, the average particle diameter is 17.50-18.00 mu m.
3. The ultra-high performance concrete based on recycled micropowder of waste bricks as claimed in claim 1, wherein SiO in the silica fume 2 The content is more than or equal to 95 percent, and the SiO 2 Has a specific surface area of 20-25m 2 /g，SiO 2 Has an average particle diameter of 0.15 to 0.25. mu.m.
4. The ultra-high performance concrete based on the recycled micropowder of the waste bricks as claimed in claim 1, wherein the fine aggregate is standard sand which is sand in zone II, and the mud content in the fine aggregate is less than or equal to 0.5%.
5. The ultra-high performance concrete based on the recycled micropowder of the waste bricks as claimed in claim 1, wherein the recycled micropowder of the waste bricks is obtained by crushing and ball milling clay bricks in a disassembled building.
6. The ultra-high performance concrete based on recycled micropowder of waste bricks as claimed in claim 1, wherein the solid content of the polycarboxylic acid water reducing agent is 25-30%, the water reducing rate is 20-25%, and the water is tap water or drinking water.
7. The method for preparing ultra-high performance concrete based on recycled micropowder of waste bricks according to any one of claims 1 to 6, characterized by comprising the steps of:
(1) taking portland cement, silica fume, waste brick regenerated micro powder and fine aggregate, and stirring and mixing by using a rotary mixing stirrer to obtain a mixture;
(2) adding a polycarboxylic acid water reducing agent into water, stirring to obtain an aqueous solvent, adding the aqueous solvent into the mixture, and stirring and mixing to obtain mixed slurry;
(3) and scraping off slurry attached to the wall of the stirrer by using a multifunctional tool with a fixed position on the rotary mixing stirrer to mix with the mixed slurry, and continuously stirring and mixing to obtain the ultra-high performance concrete based on the waste brick regenerated micro powder.
8. The method as claimed in claim 7, wherein the rotational speed of the rotor of the rotary mixer is 130-170r/min, the rotational speed of the mixing vessel of the rotary mixer is 20-40r/min, the rotational direction of the rotor of the rotary mixer is opposite to that of the mixing vessel, and the mixing time is 100-140 s.
9. The method as claimed in claim 7, wherein the rotation speed of the rotor of the rotary mixer is 280-320r/min, the rotation speed of the mixing container of the rotary mixer is 20-40r/min, the rotation direction of the rotor of the rotary mixer is opposite to that of the mixing container, and the mixing time is 300-420 s.
10. The method as claimed in claim 7, wherein the rotational speed of the rotor of the rotary mixer is 280-320r/min, the rotational speed of the mixing vessel of the rotary mixer is 20-40r/min, the rotational direction of the rotor of the rotary mixer is opposite to the rotational direction of the mixing vessel, and the time for mixing is 100-140 s.
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