CN112707701B - Recycled concrete handicraft and preparation method thereof - Google Patents
Recycled concrete handicraft and preparation method thereof Download PDFInfo
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- CN112707701B CN112707701B CN202011589510.9A CN202011589510A CN112707701B CN 112707701 B CN112707701 B CN 112707701B CN 202011589510 A CN202011589510 A CN 202011589510A CN 112707701 B CN112707701 B CN 112707701B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
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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
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00956—Uses not provided for elsewhere in C04B2111/00 for making sculptures or artistic casts
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- 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
Abstract
The invention relates to the technical field of concrete artware, in particular to a recycled concrete artware and a preparation method thereof. The invention provides a recycled concrete handicraft which comprises the following preparation raw materials in parts by mass: 100 parts of cement, 8-20 parts of mineral powder, 3-5 parts of silica fume, 300-700 parts of recycled aggregate, 1.0-3.0 parts of water reducing agent, 1-3 parts of defoaming agent, 1-5 parts of magnesium aluminum silicate, 0.3-0.8 part of fiber and 40-60 parts of water. The recycled concrete handicraft has the advantages of no bubble on the surface, smooth facing, small shrinkage, good impact resistance and low cost.
Description
Technical Field
The invention relates to the technical field of concrete artware, in particular to a recycled concrete artware and a preparation method thereof.
Background
The recycled aggregate is prepared by processing concrete, mortar, stone, tiles and the like in construction waste or construction waste and has particles with certain gradation. The recycled concrete is obtained by partially or completely replacing natural aggregates such as sand stones and the like with recycled aggregates and then adding a cementing material, an additive, water and the like. The use of the recycled aggregate effectively relieves the influence of the construction waste on human society and the damage to ecological environment.
The recycled aggregate has high water absorption rate, so that the prepared recycled concrete has high water consumption, low strength, high gelled material consumption, high shrinkage, more facing bubbles and poor appearance quality. So that no relevant technology for producing recycled concrete artware by using recycled aggregate exists at present.
Disclosure of Invention
The invention aims to provide a recycled concrete handicraft and a preparation method thereof. The recycled concrete handicraft has the advantages of no bubble on the surface, smooth facing, small shrinkage, good impact resistance and low cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a recycled concrete handicraft which comprises the following preparation raw materials in parts by mass:
100 parts of cement, 8-20 parts of mineral powder, 3-5 parts of silica fume, 300-700 parts of recycled aggregate, 1.0-3.0 parts of water reducing agent, 1-3 parts of defoaming agent, 1-5 parts of magnesium aluminum silicate, 0.3-0.8 part of fiber and 40-60 parts of water.
Preferably, the gradation of the recycled aggregate comprises 0.15-0.30 mm, 0.30-0.60 mm, 0.60-1.18 mm, 1.18-2.36 mm, 2.36-4.75 mm, 4.75-7 mm and 7-9.5 mm.
Preferably, the minimum thickness of the recycled concrete handicraft is recorded as d;
when d is larger than 11mm, the grading of the recycled aggregate is as follows: 7-9.5 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 7-9.5 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5).
Preferably, the minimum thickness of the recycled concrete handicraft is recorded as d;
when d is more than or equal to 8mm and less than 11mm, the grading of the recycled aggregate is as follows: 4.75-7 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 4.75-7 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5).
Preferably, the minimum thickness of the recycled concrete handicraft is recorded as d;
when d is more than or equal to 5.0mm and less than 8mm, the grading of the recycled aggregate is as follows: 2.36-4.75 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 2.36-4.75 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5).
Preferably, the minimum thickness of the recycled concrete handicraft is recorded as d;
when d is more than or equal to 2.5mm and less than 5.0mm, the grading of the recycled aggregate is as follows: 1.18-2.36 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 1.18-2.36 mm to the recycled aggregate of 0.15-0.30 mm is 1: (0.5-1).
The invention also provides a preparation method of the recycled concrete handicraft, which comprises the following steps:
mixing cement, mineral powder, silica fume, recycled aggregate, magnesium aluminum silicate and fibers to obtain a mixture;
mixing the mixture, a water reducing agent, a defoaming agent and water to obtain mixed slurry;
and sequentially carrying out vibration forming, initial curing and later curing on the mixed slurry to obtain the recycled concrete handicraft.
Preferably, the vibration frequency of the vibration molding is more than or equal to 47Hz, the no-load amplitude is 0.2-0.6 mm, and the vibration time is 10-40 s.
Preferably, the humidity of the initial curing is more than or equal to 80 percent, the temperature is 15-35 ℃, and the time is 24 hours.
Preferably, the humidity of the later-stage curing is more than or equal to 90 percent, the temperature is 15-35 ℃, and the time is 14 days.
The invention provides a recycled concrete handicraft, which comprises the following preparation raw materials in parts by mass: 100 parts of cement, 8-20 parts of mineral powder, 3-5 parts of silica fume, 300-700 parts of recycled aggregate, 1.0-3.0 parts of water reducing agent, 1-3 parts of defoaming agent, 1-5 parts of magnesium aluminum silicate, 0.3-0.8 part of fiber and 40-60 parts of water. In the invention, the defoaming agent can destroy bubbles in the mixed slurry for preparing the recycled concrete handicraft, and because the bubbles in the mixed slurry are few, the strength of the finally prepared recycled concrete handicraft is obviously improved, and simultaneously the appearance quality of the recycled concrete handicraft is effectively improved, so that no bubbles exist on the outer surface of the recycled concrete handicraft; the fiber improves the toughness and the shock resistance of the recycled concrete handicraft to a great extent; the addition of the water reducing agent can improve the workability of the slurry, effectively reduce the water-cement ratio and effectively improve the strength of the recycled concrete artware; the addition of the mineral powder optimizes the pore structure of the mixed slurry, reduces the content of calcium hydroxide in the regenerated concrete artware, and reduces the possibility of surface efflorescence of the artware; the silica fume is added to fill gaps in cement and mineral powder, so that the finally prepared recycled concrete artware is more compact, and the pore structure of the mixed slurry is optimized; the silica in the silica fume reacts with the hydration product calcium hydroxide of the cement, so that the strength of the finally prepared recycled concrete handicraft can be improved, the alkalinity of the recycled concrete handicraft can be reduced, the possibility of surface efflorescence of the handicraft can be reduced, and the maintenance time of the recycled concrete handicraft can be shortened; the use of the magnesium aluminum silicate can make the slurry with low cement mixing amount more viscous, the slurry is not easy to disperse, the workability is better, and the slurry has certain thixotropy, thereby being more beneficial to the molding of the regenerated concrete handicraft with a complex structure, being also beneficial to the discharge of bubbles and improving the strength of the regenerated concrete handicraft. Therefore, the recycled concrete handicraft has no bubbles on the surface, smooth facing, small shrinkage, good impact resistance and low cost.
Drawings
FIG. 1 is a diagram of a hexagonal prism pen container prepared in example 1;
FIG. 2 is a diagram of a quincunx ash collecting ashtray made of the solid cylinder in example 2.
Detailed Description
The invention provides a recycled concrete handicraft which comprises the following preparation raw materials in parts by mass:
100 parts of cement, 8-20 parts of mineral powder, 3-5 parts of silica fume, 300-700 parts of recycled aggregate, 1.0-3.0 parts of water reducing agent, 1-3 parts of defoaming agent, 1-5 parts of magnesium aluminum silicate, 0.3-0.8 part of fiber and 40-60 parts of water.
In the present invention, all the starting materials for the preparation are commercially available products well known to those skilled in the art, unless otherwise specified.
The recycled concrete handicraft provided by the invention comprises 100 parts of cement by mass. In the present invention, the cement is preferably portland cement with a strength grade of 42.5 or more, and the portland cement preferably meets the requirements of GB 175 general portland cement or the requirements of GB/T2015 white portland cement. In an embodiment of the present invention, the portland cement is specifically p.w42.5 white portland cement or p.o42.5 ordinary portland cement.
Based on the weight portion of the cement, the recycled concrete handicraft comprises 8-20 portions of mineral powder, preferably 10-15 portions. In the invention, the mineral powder is preferably S95 grade or S105 grade specified in GB/T18046 granulated blast furnace slag powder used in cement and concrete. In the invention, the addition of the mineral powder optimizes the pore structure of the mixed slurry, reduces the content of calcium hydroxide in the regenerated concrete artware and reduces the possibility of surface efflorescence of the artware.
Based on the weight portion of the cement, the recycled concrete handicraft comprises 3-5 portions of silica fume, preferably 3.6-4.2 portions. In the invention, the silica fume is preferably the silica fume specified in GB/T18736 mineral admixture for high-strength and high-performance concrete. In the invention, the silica fume is added to fill gaps in cement and mineral powder, so that the finally prepared recycled concrete artware is more compact, and the pore structure of the mixed slurry is optimized; the silica in the silica fume reacts with the hydration product calcium hydroxide of the cement, so that the strength of the finally prepared recycled concrete handicraft can be improved, the alkalinity of the recycled concrete handicraft can be reduced, the possibility of efflorescence on the surface of the handicraft can be reduced, and the maintenance time of the recycled concrete handicraft can be shortened.
The recycled concrete handicraft provided by the invention comprises 300-700 parts of recycled aggregate, preferably 400-600 parts, and more preferably 450-550 parts by weight of cement. In the present invention, the gradation of the recycled aggregate preferably includes 0.15 to 0.30mm, 0.30 to 0.60mm, 0.60 to 1.18mm, 1.18 to 2.36mm, 2.36 to 4.75mm, 4.75 to 7mm and 7 to 9.5mm. In the invention, the minimum thickness of the recycled concrete handicraft is marked as d; when d is larger than 11mm, the grading of the recycled aggregate is as follows: 7-9.5 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 7-9.5 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5); when d is more than or equal to 8mm and less than 11mm, the grading of the recycled aggregate is as follows: 4.75-7 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 4.75-7 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5); when d is more than or equal to 5.0mm and less than 8mm, the grading of the recycled aggregate is as follows: 2.36-4.75 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 2.36-4.75 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5); when d is more than or equal to 2.5mm and less than 5.0mm, the grading of the recycled aggregate is as follows: 1.18-2.36 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 1.18-2.36 mm to the recycled aggregate of 0.15-0.30 mm is 1: (0.5-1). In the present invention, among the graded recycled aggregates, recycled aggregates having a particle size in the range of 0.15 to 4.75mm preferably satisfy the requirements of GBT 25176 "recycled fine aggregates for concrete and mortar" and the above, and recycled aggregates having a particle size in the range of 4.75 to 9.5mm preferably satisfy the requirements of GBT 25176 "recycled fine aggregates for concrete and mortar" and the above.
In the invention, the gradation of the recycled aggregate reduces the porosity of the recycled aggregate, thereby reducing the using amount of cement, and the reduction of the using amount of the cement can effectively reduce the viscosity of the slurry, thereby being more beneficial to discharging air bubbles and simultaneously effectively reducing the chemical shrinkage of cement hydration.
Based on the weight of the cement, the recycled concrete artware provided by the invention comprises 1.0-3.0 parts of water reducing agent, preferably 1.2-2.6 parts. In the present invention, the water reducing agent is preferably a polycarboxylic acid water reducing agent. In the present invention, the water-reducing agent is preferably used in the form of a water-reducing agent solution, and the amount of the water-reducing agent used is preferably the amount of the water-reducing agent in the water-reducing agent solution. In a specific embodiment of the invention, the water reducer is specifically a viscosity-reducing low-air-entraining type polycarboxylate water reducer-GBH (solid content is 40%) produced by Guangdong red wall GmbH.
In the invention, the addition of the water reducing agent can improve the workability of the slurry, effectively reduce the water-cement ratio and effectively improve the strength of the concrete artware; the addition of the mineral powder reduces the consumption of cement, thereby reducing the cost of artware.
The recycled concrete handicraft provided by the invention comprises 1-3 parts of defoaming agent, preferably 1.2-2.3 parts, and more preferably 1.6-1.9 parts by weight of cement. In the present invention, the antifoaming agent is preferably a polyether antifoaming agent, and more preferably JI-901 polyether antifoaming agent produced by Jing technologies, inc., of Fushan City. In the invention, the defoaming agent can break the bubbles of the mixed slurry for preparing the recycled concrete handicraft, and because the bubbles in the mixed slurry are very few, the strength of the finally prepared recycled concrete handicraft is obviously improved, and simultaneously, the appearance quality of the recycled concrete handicraft is effectively improved, so that no bubbles exist on the outer surface of the recycled concrete handicraft.
The recycled concrete handicraft provided by the invention comprises 1-5 parts of magnesium aluminum silicate by weight of cement, preferably 2-3 parts. In the invention, the use of the magnesium aluminum silicate can make the slurry with low cement mixing amount more viscous, the slurry is not easy to disperse, and the workability is better, and the slurry has certain thixotropy, thus being more beneficial to the molding of the regenerated concrete handicraft with a more complex structure, being beneficial to the discharge of air bubbles and improving the strength of the regenerated concrete handicraft.
The recycled concrete handicraft provided by the invention comprises 0.3-0.8 part of fiber, preferably 0.5-0.7 part of fiber based on the weight part of the cement. In the present invention, the nominal length of the fiber is preferably 6 to 16mm, and the equivalent diameter is preferably 14 to 25 μm. The fibers are preferably synthetic fibers, more preferably monofilament polypropylene fibers; the synthetic fiber preferably meets the requirements of GB/T21120 synthetic fiber for cement concrete and mortar. In a specific embodiment of the present invention, the fiber is specifically a polypropylene fiber produced by taili chemical fiber products ltd, huimin county.
In the invention, the fiber greatly improves the toughness and the impact resistance of the recycled concrete artware.
The recycled concrete handicraft provided by the invention comprises 40-60 parts of water, preferably 48-52 parts of water based on the weight parts of the cement. In the present invention, the water is preferably water prescribed by JGJ 63 Standard for Water for concrete blending.
In the invention, when the color of the recycled concrete handicraft is required, the preparation raw material of the recycled concrete handicraft also comprises pigment. In the present invention, the pigment is preferably used in an inorganic pigment, more preferably an iron oxide inorganic pigment. In the present invention, the pigment is preferably an inorganic pigment which preferably satisfies at least the requirements of a good product stipulated by JC/T539 inorganic pigment for concrete and mortar and test method thereof. In a specific embodiment of the present invention, the pigment is iron oxide yellow S313 manufactured by shanghai yipin pigments co.
The invention also provides a preparation method of the recycled concrete handicraft, which comprises the following steps:
mixing cement, mineral powder, silica fume, recycled aggregate, magnesium aluminum silicate and fibers to obtain a mixture;
mixing the mixture, a water reducing agent, a defoaming agent and water to obtain mixed slurry;
and sequentially carrying out vibration molding, initial curing and later curing on the mixed slurry to obtain the recycled concrete handicraft.
The invention mixes cement, mineral powder, silica fume, recycled aggregate, magnesium aluminum silicate and fiber to obtain a mixture. The present invention preferably pre-treats the recycled aggregate prior to mixing. In the present invention, the pretreatment is preferably to grind the recycled aggregate in a grinder for 10min, remove the recycled aggregate larger than 9.5mm and smaller than 0.15mm, and then screen the recycled aggregate of 0.15mm to 9.5mm into recycled aggregates with particle sizes of 0.15mm to 0.3mm, 0.30mm to 0.60mm, 0.60mm to 1.18mm, 1.18mm to 2.36mm, 2.36mm to 4.75mm, 4.75mm to 7mm and 7mm to 9.5mm for standby. And grading and adjusting the recycled aggregate according to the requirement of the minimum thickness of the recycled concrete handicraft. In the present invention, the grinding can further flatten the corners of the recycled aggregate, thereby further reducing the voids in the recycled aggregate.
In the invention, the grinding is preferably carried out in a grinding mill, the inner diameter and length of a grinding cylinder of the grinding mill are preferably phi 500mm multiplied by 500mm, the external dimension is preferably 1582mm multiplied by 760mm multiplied by 1053mm, the power of a motor is preferably 1.5KW, the power supply voltage is preferably 380V, the frequency is preferably 50Hz, the rotating speed of the grinding mill is preferably 48r/min, the loading amount of recycled aggregate is preferably 20kg, and the grinding time is preferably 10min. The grinding bodies are preferably steel balls and steel sections; the diameter of the steel balls is preferably 40mm, and the number of the steel balls is preferably 50; the diameter and length of the steel segments are preferably 20mm and 30mm respectively, and the number is preferably 500.
In the present invention, the mixing is preferably performed under stirring, and in the present invention, the rotation speed of the stirring is preferably 40 to 50 revolutions/min, and the time is preferably 1min.
After the mixture is obtained, the mixture, the water reducing agent, the defoaming agent and the water are mixed to obtain the mixed slurry. In the present invention, the mixing is preferably performed under stirring conditions, and the stirring speed is not particularly limited, and may be a speed well known to those skilled in the art; the stirring time is preferably 4min.
After the mixed slurry is obtained, the mixed slurry is subjected to vibration forming, initial curing and later curing in sequence to obtain the recycled concrete artware.
In the present invention, the mold is preferably a silicone mold. The inner surface of the mould is preferably guaranteed to be smooth.
In the invention, the vibration frequency of the vibration forming is preferably more than or equal to 47Hz, and more preferably 50Hz; the unloaded amplitude is preferably 0.2-0.6 mm, more preferably 0.35-0.50 mm; the vibration time is preferably 10 to 40 seconds, more preferably 20 to 30 seconds. In the invention, when the height of the recycled concrete handicraft is less than or equal to 4cm, the vibration molding is to pour the mixed slurry into a mould and fix the mould on a horizontal vibration table for vibration molding treatment; when the height of the recycled concrete handicraft is more than 4cm, the vibration molding is a process of pouring and vibration molding the mixed slurry in a mold for multiple times, and the height of each pouring and vibration molding is less than or equal to 4cm.
In the invention, the humidity of the initial curing is preferably more than or equal to 80 percent, the temperature is preferably 15-35 ℃, and more preferably 20-30 ℃; the time is preferably 24h.
After the initial maintenance, the invention also preferably comprises the step of removing the mould; the present invention does not have any particular limitation on the removal, and may be performed by a process known to those skilled in the art.
In the invention, the humidity of the later-stage curing is preferably more than or equal to 90%, the temperature is preferably 15-35 ℃, and more preferably 20-30 ℃; the time period is preferably 14 days.
The recycled concrete artware and the preparation method thereof provided by the invention are described in detail with reference to the following examples, but the invention is not to be construed as being limited by the scope of the invention.
The parts in each of the preparation raw materials in examples 1 to 2 are parts by weight, and the parts by weight are understood that the amount of the preparation raw materials used is not required for a unit grade, and may be "g", "kg", or "t", etc.
Example 1
Recycled concrete artwork (hexagonal prism pen container):
size:
the diameter of the middle cylinder: 55mm, thickness of the pen container: 11mm, height: 95mm, the color is the natural color of the concrete;
preparing raw materials:
cement: 100 parts of P.O42.5 portland cement;
mineral powder: 15 parts, grade S95 specified in GB/T18046 granulated blast furnace slag powder for cement and concrete;
silica fume: 5 parts of silica fume specified in GB/T18736 mineral admixture for high-strength and high-performance concrete;
recycled aggregate: 600 parts of water;
water reducing agent: 1.5 parts of a viscosity-reducing low-air-entraining type polycarboxylate superplasticizer GBH produced by Guangdong red wall GmbH, wherein the solid content is 40%;
defoaming agent: 1 part of J I-901 polyether defoamer produced by Jing Tech technologies, inc. in Fushan City;
magnesium aluminum silicate: 2 parts of (1);
fiber: 0.4 part of monofilament polypropylene fiber, which meets the requirements of GB/T21120 synthetic fiber for cement concrete and mortar, and has the nominal length of 12mm and the equivalent diameter of 18 mu m;
water: 45 parts of water, which is specified in JGJ 63 Water Standard for concrete mixing;
the preparation method comprises the following steps:
grinding the recycled aggregate for 10min, removing the recycled aggregate with the particle size of more than 9.5mm and less than 0.15mm, and then screening the recycled aggregate with the particle size of 0.15-9.5 mm into the recycled aggregate with the particle size of 0.15-0.3 mm, 0.30-0.60 mm, 0.60-1.18 mm, 1.18-2.36 mm, 2.36-4.75 mm, 4.75-7 mm and 7-9.5 mm for later use; selecting recycled aggregate with the grain sizes of 4.75-7 mm, 0.60-1.18 mm and 0.15-0.30 mm, and controlling the mass ratio to be 2:0.7:0.3 as recycled aggregate of the present example;
stirring cement, mineral powder, silica fume, recycled aggregate, magnesium aluminum silicate and fibers in a stirrer at the rotating speed of 47 revolutions per minute for 1min to obtain a mixture;
mixing and stirring the mixture, the water reducing agent, the defoaming agent and water for 4min to obtain mixed slurry;
pouring the mixed slurry into a silica gel mold (the height of about 4cm is poured each time) for three times, and performing vibration molding (each pouring layer vibrates for 25s, the vibration frequency is 50Hz, the no-load amplitude is 0.3 mm), curing (the humidity is more than or equal to 80%, the temperature is 30 ℃, the time is 24 h), demolding and post-curing (the humidity is more than or equal to 90%, the temperature is 25 ℃, the time is 14 days) to obtain the recycled concrete handicraft (the physical diagram is shown in figure 1);
the recycled concrete artware can not see bubbles with naked eyes, the surface roughness is less than or equal to 1.6 mu m, and the process drying shrinkage rate is less than or equal to 0.030 percent; the recycled concrete artware is freely dropped onto the C30 concrete ground from a height of 1 meter, and the process is repeated for 5 times without visible cracks.
Example 2
Recycled concrete artware (plum blossom-shaped ash collecting ashtray with a solid cylinder inwards concave):
size:
diameter: 100mm, height: 30mm, a solid cylinder is inwards concaved into a quincunx ash collecting ashtray, the width of the ash collecting inner cylinder is 70mm, the thickness of the inner cylinder is 10mm, and the color of the inner cylinder is light yellow;
preparing raw materials:
cement: 100 parts of P.W42.5 white portland cement;
mineral powder: 10 parts, grade S105 specified in GB/T18046 granulated blast furnace slag powder for cement and concrete;
silica fume: 5 parts of silica fume specified in GB/T18736 mineral admixture for high-strength and high-performance concrete;
recycled aggregate: 500 parts;
water reducing agent: 2.0 part of viscosity-reducing low-air-entraining polycarboxylate superplasticizer GBH produced by Guangdong red wall GmbH, wherein the solid content is 40 percent;
defoaming agent: 1.5 parts of J I-901 polyether defoamer produced by Jing technologies Co., ltd, fushan City;
magnesium aluminum silicate: 2 parts of a mixture;
fiber: 0.5 part of monofilament polypropylene fiber, which meets the requirements of GB/T21120 synthetic fiber for cement concrete and mortar, and has the nominal length of 16mm and the equivalent diameter of 25 mu m;
water: 50 parts of water, which is specified in JGJ 63 Water Standard for concrete mixing;
pigment: 1 part of iron oxide yellow S313 produced by Shanghai Yipin pigment Co., ltd, and first-grade C.I. pigment yellow;
the preparation method comprises the following steps:
grinding the recycled aggregate for 10min, removing the recycled aggregate with the particle size of more than 9.5mm and less than 0.15mm, and then screening the recycled aggregate with the particle size of 0.15-9.5 mm into recycled aggregate with the particle size of 0.15-0.3 mm, 0.30-0.60 mm, 0.60-1.18 mm, 1.18-2.36 mm, 2.36-4.75 mm, 4.75-7 mm and 7-9.5 mm for later use; selecting recycled aggregate with the grain sizes of 7-9.5 mm, 0.60-1.18 mm and 0.15-0.30 mm, and controlling the mass ratio to be 2:0.8:0.35 as recycled aggregate of the present example;
stirring cement, mineral powder, silica fume, recycled aggregate, magnesium aluminum silicate and fibers in a stirrer at the rotating speed of 47 revolutions per minute for 1min to obtain a mixture;
mixing and stirring the mixture, the water reducing agent, the defoaming agent and water for 4min to obtain mixed slurry;
pouring the mixed slurry into a silica gel mold at one time, and carrying out vibration molding (the vibration frequency is 47Hz, the no-load amplitude is 0.5mm, the vibration time is 20 s), maintenance (the humidity is more than or equal to 80%, the temperature is 20 ℃, the time is 24 h) and later-stage maintenance (the humidity is more than or equal to 90%, the temperature is 26 ℃, the time is 14 days) to obtain the recycled concrete artware (the material object diagram is shown in figure 2);
the recycled concrete handicraft cannot see bubbles with naked eyes, the surface roughness is less than or equal to 1.4 mu m, and the process drying shrinkage rate is less than or equal to 0.025 percent; the recycled concrete artware is freely dropped onto the C30 concrete ground from a height of 1 meter, and the process is repeated for 5 times without visible cracks.
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 (5)
1. The recycled concrete handicraft is characterized by comprising the following preparation raw materials in parts by mass:
100 parts of cement, 8-20 parts of mineral powder, 3-5 parts of silica fume, 300-700 parts of recycled aggregate, 1.0-3.0 parts of water reducing agent, 1-3 parts of defoaming agent, 1-5 parts of magnesium aluminum silicate, 0.3-0.8 part of fiber and 40-60 parts of water;
the gradation of the recycled aggregate comprises 0.15-0.30 mm, 0.30-0.60 mm, 0.60-1.18 mm, 1.18-2.36 mm, 2.36-4.75 mm, 4.75-7 mm and 7-9.5 mm;
the minimum thickness of the recycled concrete handicraft is recorded as d;
when d is larger than 11mm, the grading of the recycled aggregate is as follows: 7-9.5 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 7-9.5 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5);
when d is more than or equal to 8mm and less than 11mm, the grading of the recycled aggregate is as follows: 4.75-7 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 4.75-7 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5);
when d is more than or equal to 5.0mm and less than 8mm, the grading of the recycled aggregate is as follows: 2.36-4.75 mm, 0.60-1.18 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 2.36-4.75 mm, 0.60-1.18 mm and 0.15-0.30 mm is 2: (0.5-1): (0.25-0.5);
when d is more than or equal to 2.5mm and less than 5.0mm, the grading of the recycled aggregate is as follows: 1.18-2.36 mm and 0.15-0.30 mm; the mass ratio of the recycled aggregate of 1.18-2.36 mm to the recycled aggregate of 0.15-0.30 mm is 1: (0.5-1).
2. The method for preparing recycled concrete artware according to claim 1, characterized by comprising the steps of:
mixing cement, mineral powder, silica fume, recycled aggregate, magnesium aluminum silicate and fibers to obtain a mixture;
mixing the mixture, a water reducing agent, a defoaming agent and water to obtain mixed slurry;
and sequentially carrying out vibration molding, initial curing and later curing on the mixed slurry to obtain the recycled concrete handicraft.
3. The method according to claim 2, wherein the vibration frequency of the vibration molding is not less than 47Hz, the no-load amplitude is 0.2-0.6 mm, and the vibration time is 10-40 s.
4. The preparation method according to claim 2, wherein the humidity of the initial curing is not less than 80%, the temperature is 15-35 ℃, and the time is 24h.
5. The method of claim 2, wherein the post-curing is carried out at a humidity of 90% or more, a temperature of 15 to 35 ℃, and a time of 14 days.
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