CN114380562A - Preparation method of anti-freezing recycled concrete and anti-freezing recycled concrete - Google Patents
Preparation method of anti-freezing recycled concrete and anti-freezing recycled concrete Download PDFInfo
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- CN114380562A CN114380562A CN202210181122.XA CN202210181122A CN114380562A CN 114380562 A CN114380562 A CN 114380562A CN 202210181122 A CN202210181122 A CN 202210181122A CN 114380562 A CN114380562 A CN 114380562A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- C04B18/18—Waste materials; Refuse organic
- C04B18/20—Waste materials; Refuse organic from macromolecular compounds
- C04B18/22—Rubber, e.g. ground waste tires
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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
- 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
- C04B20/023—Chemical treatment
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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
- 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
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
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Abstract
The application relates to the field of concrete materials, and particularly discloses a preparation method of anti-freezing recycled concrete and the anti-freezing recycled concrete. A preparation method of anti-freezing recycled concrete comprises the following steps: crushing and screening waste concrete to obtain prefabricated coarse aggregate particles; fully soaking the prefabricated coarse aggregate particles in the graphene oxide dispersion liquid, taking out the prefabricated coarse aggregate particles, and airing the prefabricated coarse aggregate particles until the surface is anhydrous to obtain a regenerated coarse aggregate; according to the weight parts, 290 parts of 270-plus-material cement, 850 parts of 830-plus-material recycled coarse aggregate, 850 parts of 830-plus-material fine aggregate, 130 parts of admixture, 40-50 parts of waste foamed rubber powder, 180 parts of 170-plus-material water, 6-8 parts of anti-freezing water reducer and 5-10 parts of expansion crack resistance agent are uniformly stirred to obtain the anti-freezing recycled concrete. The anti-freezing recycled concrete prepared by the method has a good freeze-thaw resistance effect and excellent mechanical strength.
Description
Technical Field
The application relates to the field of concrete materials, in particular to early-strength antifreezing concrete and a preparation method thereof.
Background
Concrete is a general term for engineering mixed materials which integrate aggregate by cementitious materials and is widely applied to civil engineering. Concrete is required to have different functions according to the use environment. Because the region of China is vast and the temperature is generally below-5 ℃ in winter in the northern region, the concrete is required to have certain freeze-thaw resistance. The main reason for the damage of common concrete caused by freezing is that the ice crystal is increased at low temperature and the structure of the concrete is damaged due to pressure, and the use of the anti-freezing additive is an effective method for improving the freezing resistance of the concrete.
However, as for recycled concrete, as the used aggregate is crushed from waste concrete, compared with natural aggregate, the recycled aggregate has more surface cracks and high water absorption rate, and the expansion pressure of the cement stone generated by freezing water in concrete pores at low temperature can aggravate the growth of fine cracks, so that the recycled aggregate is more easily damaged at low temperature; in addition, the interface bonding strength between mortar and recycled aggregate in the concrete is deteriorated under low temperature conditions, and the durability of the concrete is further affected. Obviously, the current formula design of the anti-freezing concrete is not well suitable for recycled concrete.
Disclosure of Invention
In order to solve the problems, the application provides a preparation method of anti-freezing recycled concrete and the anti-freezing recycled concrete.
In a first aspect, the application provides a preparation method of anti-freezing recycled concrete, which adopts the following technical scheme: a preparation method of anti-freezing recycled concrete comprises the following steps:
crushing and screening waste concrete to obtain prefabricated coarse aggregate particles; fully soaking the prefabricated coarse aggregate particles in the graphene oxide dispersion liquid, taking out the prefabricated coarse aggregate particles, and airing the prefabricated coarse aggregate particles until the surface is anhydrous to obtain a regenerated coarse aggregate;
according to the weight parts, 290 parts of 270-plus-material cement, 850 parts of 830-plus-material recycled coarse aggregate, 850 parts of 830-plus-material fine aggregate, 130 parts of admixture, 40-50 parts of waste foamed rubber powder, 180 parts of 170-plus-material water, 6-8 parts of anti-freezing water reducer and 5-10 parts of expansion crack resistance agent are uniformly stirred to obtain the anti-freezing recycled concrete.
The recycled coarse aggregate is obtained by crushing waste concrete, so that the recycled coarse aggregate has more cracks and high water absorption rate, the anti-freezing effect is inferior to that of common concrete, modification and reinforcement treatment needs to be carried out on the recycled coarse aggregate in order to improve the performance of the concrete, and the traditional modifying method of the recycled coarse aggregate is complex, low in efficiency and difficult to operate. By adopting the technical scheme, the waste concrete is soaked in the graphene oxide dispersion liquid without additional particle shaping or complex strengthening procedures, the mechanical strength of the recycled aggregate can be improved by treating the graphene oxide dispersion liquid, the quality loss rate of the recycled concrete can be reduced under freeze-thaw cycle, and the performance of the recycled coarse aggregate is improved, so that the anti-freezing performance of the recycled coarse aggregate is improved.
In addition, the antifreezing water reducing agent of the present application can be selected from common antifreezing water reducing agents having antifreezing effects, and the types thereof are not particularly limited as long as certain antifreezing and water reducing effects can be achieved. Under the low-temperature freeze-thaw environment, the water in the concrete is subjected to the alternating action of positive and negative temperature, so that the volume-shrinkage periodic change occurs, the periodic fatigue stress is generated in the concrete, the bonding strength of the aggregate and the cementing material is influenced, and the compression strength and the breaking strength of the concrete are reduced. In order to solve the problems, waste foamed rubber powder is added, and the rubber particles are rough in surface and easy to adsorb bubbles, so that the stability and uniformity of gas distribution in concrete can be improved, and the effect similar to that of an air entraining agent is achieved; and the interior of the foamed rubber has a fine pore structure, so that the foamed rubber has good elastic deformation capacity, can play a role in buffering the expansive force during water freeze thawing and delay the growth of microcracks, thereby improving the freeze-thaw resistance of the recycled concrete.
Preferably, in parts by weight, 10-20 parts of redispersible latex powder and 4-6 parts of carboxymethyl cellulose are added into 400 parts of water of 300-400 parts and uniformly mixed, and then 30-40 parts of graphene oxide and 50-70 parts of nano silicon dioxide are added and uniformly mixed to obtain the graphene oxide dispersion liquid.
By adopting the technical scheme, the carboxymethyl cellulose added into the graphene oxide dispersion liquid can improve the mixing and dispersing uniformity of all raw materials, and the graphene oxide dispersion liquid can be filled into the fine cracks of the recycled aggregate and forms a film, so that the water absorption rate of the recycled aggregate is reduced, the growth of the cracks is inhibited, and the performance of the recycled aggregate is improved.
Preferably, the waste foamed rubber powder is prepared by foaming the following raw materials in parts by weight: 100-120 parts of waste rubber powder, 10-20 parts of modified corncob powder, 1-2 parts of vulcanizing agent, 1-2 parts of accelerator, 1-2 parts of activator, 30-40 parts of plasticizer and 2-4 parts of foaming agent;
the modified corncob powder is obtained by processing corncobs through a graphene oxide dispersion liquid.
The corncob has the advantages that the corncob comprises the main components of sugar and crude fiber, and a plurality of micro pores are formed in the corncob, so that the corncob has good elasticity; the obtained corncob-rubber composite material is used in concrete and can play a role in improving the early strength of the concrete. However, since the plant fiber in the corncob contains a large amount of polar groups such as hydroxyl groups and the like, the surface of the corncob has strong polarity and strong hygroscopicity, and the corncob has poor compatibility with rubber, the graphene oxide dispersion liquid can be adsorbed by the treatment of the graphene oxide dispersion liquid by utilizing the high adsorption force of the corncob, so that the surface performance of the corncob is improved, the compatibility of the corncob with the rubber is improved, and the obtained modified corncob is used as the filler of the foamed rubber, so that the pore structure of the foamed rubber can be enriched, and the elasticity of the foamed rubber at low temperature is improved.
Preferably, the waste foamed rubber powder is prepared by the following method: crushing waste rubber to obtain waste rubber particles;
according to the proportion, waste rubber particles are put into an internal mixer, the internal mixing temperature is raised to 110 ℃., then an activating agent, modified corncob powder and a plasticizer are added, the internal mixing temperature is raised to 140 ℃., then the internal mixing is carried out for 3-5min, and a section of rubber compound is obtained;
adding the first-stage rubber compound, the accelerator, the vulcanizing agent and the foaming agent into an internal mixer, and continuing to roll for 3-5min after the internal mixing temperature is raised to 130-140 ℃ to obtain a second-stage rubber compound;
vulcanizing the two-stage rubber compound for 250 seconds at the temperature of 160-170 ℃ and the pressure of 6-8MPa to obtain vulcanized rubber; and crushing and sieving the vulcanized rubber to obtain the waste foamed rubber powder.
By adopting the technical scheme, the waste foamed rubber powder takes waste rubber as a raw material, so that the production cost can be reduced, no additional carbon black needs to be added, and the preparation method is simple and easy to operate.
Preferably, the modified corncob meal is prepared by the following method: and putting the dried corncobs into the graphene oxide dispersion liquid, fully soaking, drying, crushing and sieving to obtain the modified corncob powder.
Preferably, the fine aggregate is composed of medium sand and coarse sand in a weight ratio of 1: 2-3.
By adopting the technical scheme, the fine aggregate consisting of the medium sand and the coarse sand can be filled into the framework built by the coarse aggregate, so that the compactness and the structural stability of the concrete can be improved, and the mechanical strength of the concrete is improved.
Preferably, the admixture consists of fly ash and mineral powder in a weight ratio of 1: 1.5-2.
By adopting the technical scheme, the addition of the admixture can reduce the dosage of cement, thereby reducing the hydration heat of the cement and reducing the generation of concrete cracks; the addition of the fly ash and the mineral powder is beneficial to improving the early strength of the concrete and improving the frost resistance of the concrete.
In a second aspect, the present application provides an antifreeze recycled concrete prepared by the method of preparing antifreeze recycled concrete.
In summary, the present application has the following beneficial effects:
1. because this application will be wasted the concrete through the soaking treatment of peroxide graphite alkene dispersion, need not carry out extra granule plastic or complicated intensive process, through the processing of oxidation graphite alkene dispersion, can improve the mechanical strength of regeneration aggregate, moreover under freeze-thaw cycle, can reduce the quality loss rate of regeneration concrete, improve the performance of regeneration coarse aggregate to improve the freeze proof performance of regeneration coarse aggregate.
2. According to the method, the modified corncobs are added into the waste foamed rubber, so that the pore structure of the foamed rubber can be enriched, and the elasticity of the waste foamed rubber at a low temperature is improved; the obtained corncob-rubber composite material is used in recycled concrete and can play a role in improving the early strength of the concrete.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example of graphene oxide dispersion liquid
The carboxymethyl cellulose in the following preparation examples had a viscosity of 1000; the particle size of the nano silicon dioxide is 400 nm.
Preparation example 1 of graphene oxide dispersion liquid
Adding 1kg of redispersible latex powder and 0.4kg of carboxymethyl cellulose into 30kg of water with the temperature of 60 ℃, uniformly mixing, then adding 3kg of graphene oxide and 5kg of nano silicon dioxide, and uniformly mixing to obtain the graphene oxide dispersion.
Preparation example 2 of graphene oxide dispersion liquid
Adding 2kg of redispersible latex powder and 0.6kg of carboxymethyl cellulose into 40kg of water with the temperature of 60 ℃, uniformly mixing, then adding 4kg of graphene oxide and 7kg of nano silicon dioxide, and uniformly mixing to obtain the graphene oxide dispersion.
Preparation example of modified corncob meal the graphene oxide dispersion in the following preparation example was prepared from preparation example 1 of a graphene oxide dispersion.
Drying the corncobs at the temperature of 80 ℃ for 4h, taking 3kg of dried corncobs, adding 10kg of graphene oxide, fully soaking for 5h, taking out, drying at the temperature of 80 ℃ for 6h, crushing, and sieving with a 200-mesh sieve to obtain modified corncob powder.
Preparation example of waste foamed rubber powder
As shown in Table 1, the main difference between the preparation examples 1 to 3 of waste foamed rubber powders is the ratio of raw materials.
The following description will be made by taking a production example 1 of waste foamed rubber powder as an example. Except for special description, the raw materials in the preparation examples can be obtained by market, wherein the waste rubber powder in the preparation examples is from truck tires; the activator consists of zinc oxide and stearic acid in a weight ratio of 2: 1; the plasticizer is paraffin oil; the accelerator consists of an accelerator DM (2, 2' -dithiodibenzothiazole) and an accelerator TMTD (tetramethylthiuram disulfide) in a weight ratio of 3: 1; the vulcanizing agent is sulfur; the foaming agent is azodicarbonamide; the modified corncob meal is prepared from the preparation example of the modified corncob meal.
Preparation example 1 of waste foamed rubber powder
(1) Crushing waste rubber to obtain waste rubber particles with the average particle size of 15-20 mm;
putting waste rubber particles into an internal mixer, heating to 105 ℃, adding an activating agent, modified corncob powder and a plasticizer, heating to 135 ℃, and turning for 4min to obtain a first-stage rubber compound;
adding the first-stage rubber compound, the accelerator, the vulcanizing agent and the foaming agent into an internal mixer, continuously turning for 4min after the internal mixing temperature is raised to 135 ℃, adjusting the roller spacing, and discharging to obtain a second-stage rubber compound;
placing the two-stage rubber compound in a flat vulcanizing machine, and vulcanizing for 240s under the conditions that the temperature is 165 ℃ and the pressure is 7MPa to obtain vulcanized rubber;
and crushing the vulcanized rubber, and sieving with a 400-mesh sieve to obtain the waste foamed rubber powder.
TABLE 1 raw material compounding Table (unit: kg) of waste foamed rubber powder
Preparation example 4 of waste foamed rubber powder
The difference between this preparation example and preparation example 4 of waste foamed rubber powder is that the modified corncob meal is replaced by an equal amount of unmodified common corncob meal.
Examples
As shown in Table 2, examples 1 to 3 are different in the ratio of raw materials.
The following description will be given by taking example 1 as an example. The starting materials in the examples are all commercially available, unless otherwise specified. Wherein the cement is P.O42.5 portland cement; the fine aggregate consists of medium sand and coarse sand in a weight ratio of 1: 2.3; the fineness modulus of the medium sand is 2.9, and the mud content is 1.9%; the fineness modulus of the roughness is 3.2, and the mud content is 0.5%; the admixture consists of fly ash and mineral powder in a weight ratio of 1:1.8, wherein the fly ash is F-class II-grade fly ash, and the mineral powder is S95-grade mineral powder; the antifreezing water reducing agent has no special requirement, and can meet the antifreezing and water reducing effects, and the antifreezing water reducing agent in the embodiment is purchased from Qingdao Donghong spinning frame Co., Ltd, and has the model of DH-7; the expansion crack-resistant agent is purchased from Wuhan three-source special building materials, Inc., and has the model of SY-G.
Example 1: the anti-freezing recycled concrete is prepared by the following method:
s1, crushing and screening the waste concrete to obtain prefabricated coarse aggregate particles; fully soaking the prefabricated coarse aggregate particles in graphene oxide dispersion liquid with the weight 3 times that of the prefabricated coarse aggregate particles for 6 hours, taking out the prefabricated coarse aggregate particles, and airing the prefabricated coarse aggregate particles until the surface of the prefabricated coarse aggregate particles is anhydrous to obtain regenerated coarse aggregate;
and S2, taking cement, the recycled coarse aggregate with the grain size of 5-31.5mm and continuous gradation, fine aggregate, admixture, waste foamed rubber powder, water, an anti-freezing water reducer and an expansion crack resistance agent in parts by weight, and uniformly stirring to obtain the anti-freezing recycled concrete.
Wherein the waste foamed rubber powder is prepared from the preparation example 1 of the waste foamed rubber powder.
TABLE 2 raw material consumption Scale (unit: kg) for examples 1-3
Example 4
This example is different from example 1 in that the waste foamed rubber powder was prepared by the method of preparation example 2 of waste foamed rubber powder.
Example 5
This example is different from example 1 in that the waste foamed rubber powder was prepared by the method of preparation example 3 of waste foamed rubber powder.
Example 6
This example is different from example 1 in that the waste foamed rubber powder was prepared by the method of preparation example 4 of waste foamed rubber powder.
Comparative example
Comparative example 1
This comparative example differs from example 1 in S1 and S2.
S1 specifically includes the following steps: crushing and screening waste concrete to obtain prefabricated coarse aggregate particles; fully soaking the prefabricated coarse aggregate particles in water with the weight 3 times of that of the prefabricated coarse aggregate particles for 6 hours, taking out the prefabricated coarse aggregate particles, and airing the prefabricated coarse aggregate particles until the surface is anhydrous to obtain the regenerated coarse aggregate.
The raw material of S2 is not added with waste foamed rubber powder.
Comparative example 2
The comparative example differs from example 1 in S1 and specifically includes the following steps: crushing and screening waste concrete to obtain prefabricated coarse aggregate particles; fully soaking the prefabricated coarse aggregate particles in water with the weight 3 times of that of the prefabricated coarse aggregate particles for 6 hours, taking out the prefabricated coarse aggregate particles, and airing the prefabricated coarse aggregate particles until the surface is anhydrous to obtain the regenerated coarse aggregate.
Performance test
The properties of the concrete of examples and comparative examples were measured according to the following methods, and the results are shown in Table 3.
The freezing resistance performance is as follows: according to GB/T50082-2009 Standard test method for long-term performance and durability of ordinary concrete, the maximum freezing-thawing cycle times of the concrete are tested by a slow freezing method.
Early crack resistance: the total area of the concrete test block cracked in a unit area of 24 hours was measured according to the method in GB/T50082-2009 Standard test methods for Long-term Performance and durability of ordinary concrete.
Compressive strength and flexural strength: and (3) manufacturing a standard test block according to a method in GB/T50081-2016 standard of mechanical property test methods of common concrete, and measuring the compressive strength of the standard test block after 3d and 28d maintenance and the flexural strength of the standard test block after 28d maintenance.
Table 3 table for testing performance of concrete of examples and comparative examples
As can be seen by combining example 1 and comparative example 1 with Table 3, the antifreeze recycled concrete prepared by the method of the present application has good antifreeze performance, crack resistance, compressive strength and flexural strength. The performance of the recycled coarse aggregate obtained by the method can be improved, the recycled coarse aggregate can be used for completely replacing natural broken stones, and the waste foamed rubber powder is added as a filler, so that the performance of concrete can be improved under the condition of realizing the recycling of resources.
It can be seen from the combination of example 1 and example 6 that the frost resistance, crack resistance, compressive strength and flexural strength of the concrete of example 1 are significantly better than those of example 6, because the modified corncob can be used as a pore-forming agent when preparing the waste foamed rubber powder, so as to improve the pore structure of the rubber and the elasticity thereof at low temperature, and because the corncob is subjected to modification treatment, the compatibility of the corncob with the rubber can be significantly improved, so that the stability of the performance of the waste foamed rubber powder is improved, and the comprehensive performance of the concrete is improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The preparation method of the anti-freezing recycled concrete is characterized by comprising the following steps of:
crushing and screening waste concrete to obtain prefabricated coarse aggregate particles; fully soaking the prefabricated coarse aggregate particles in the graphene oxide dispersion liquid, taking out the prefabricated coarse aggregate particles, and airing the prefabricated coarse aggregate particles until the surface is anhydrous to obtain a regenerated coarse aggregate;
according to the weight parts, 290 parts of 270-plus-material cement, 850 parts of 830-plus-material recycled coarse aggregate, 850 parts of 830-plus-material fine aggregate, 130 parts of admixture, 40-50 parts of waste foamed rubber powder, 180 parts of 170-plus-material water, 6-8 parts of anti-freezing water reducer and 5-10 parts of expansion crack resistance agent are uniformly stirred to obtain the anti-freezing recycled concrete.
2. The preparation method of the anti-freezing recycled concrete according to claim 1, wherein the graphene oxide dispersion liquid is prepared by the following method: according to the weight portion, 10-20 portions of redispersible latex powder and 4-6 portions of carboxymethyl cellulose are added into 400 portions of water of 300-400 portions and uniformly mixed, and then 30-40 portions of graphene oxide and 50-70 portions of nano silicon dioxide are added and uniformly mixed to obtain the graphene oxide dispersion liquid.
3. The preparation method of the anti-freezing recycled concrete according to claim 1, wherein the waste foamed rubber powder is prepared by foaming the following raw materials in parts by weight: 100-120 parts of waste rubber powder, 10-20 parts of modified corncob powder, 1-2 parts of vulcanizing agent, 1-2 parts of accelerator, 1-2 parts of activator, 30-40 parts of plasticizer and 2-4 parts of foaming agent;
the modified corncob powder is obtained by processing corncobs through a graphene oxide dispersion liquid.
4. The preparation method of the anti-freezing recycled concrete according to claim 3, wherein the waste foamed rubber powder is prepared by the following method: crushing waste rubber to obtain waste rubber particles;
according to the proportion, waste rubber particles are put into an internal mixer, the internal mixing temperature is raised to 110 ℃., then an activating agent, modified corncob powder and a plasticizer are added, the internal mixing temperature is raised to 140 ℃., then the internal mixing is carried out for 3-5min, and a section of rubber compound is obtained;
adding the first-stage rubber compound, the accelerator, the vulcanizing agent and the foaming agent into an internal mixer, and continuing to roll for 3-5min after the internal mixing temperature is raised to 130-140 ℃ to obtain a second-stage rubber compound;
vulcanizing the two-stage rubber compound for 250 seconds at the temperature of 160-170 ℃ and the pressure of 6-8MPa to obtain vulcanized rubber;
and crushing and sieving the vulcanized rubber to obtain the waste foamed rubber powder.
5. The preparation method of the anti-freezing recycled concrete as claimed in claim 3, wherein the modified corncob meal is prepared by the following method: and putting the dried corncobs into the graphene oxide dispersion liquid, fully soaking, drying, crushing and sieving to obtain the modified corncob powder.
6. The method for preparing anti-freezing recycled concrete according to claim 1, wherein the fine aggregate is composed of medium sand and coarse sand in a weight ratio of 1: 2-3.
7. The method for preparing the anti-freezing recycled concrete according to claim 1, wherein the admixture is composed of fly ash and mineral powder in a weight ratio of 1: 1.5-2.
8. The recycled antifreeze concrete prepared by the method for preparing recycled antifreeze concrete according to claim 1.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115448657A (en) * | 2022-08-23 | 2022-12-09 | 绍兴职业技术学院 | Pervious concrete containing porous hybrid fiber modified recycled aggregate and preparation method thereof |
CN115784687A (en) * | 2022-12-01 | 2023-03-14 | 宁波工程学院 | Wave-absorbing recycled concrete and preparation method thereof |
CN116023099A (en) * | 2023-01-06 | 2023-04-28 | 扬州华运新材料科技有限公司 | Antifreezing recycled concrete and preparation method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009234863A (en) * | 2008-03-27 | 2009-10-15 | Seia:Kk | Recycled aggregate concrete and method for producing the same |
CN109574567A (en) * | 2019-01-19 | 2019-04-05 | 江苏盛达飞建筑材料有限公司 | A kind of freeze proof regeneration concrete and preparation method thereof |
CN110256025A (en) * | 2019-06-25 | 2019-09-20 | 绍兴上虞南方普银混凝土有限公司 | Its regeneration concrete of a kind of preparation process of Aggregate of recycled concrete and application |
CN113354369A (en) * | 2021-07-23 | 2021-09-07 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
CN113429178A (en) * | 2021-07-20 | 2021-09-24 | 崇德建材集团有限公司 | Freeze-thaw resistant recycled concrete and preparation method thereof |
-
2022
- 2022-02-25 CN CN202210181122.XA patent/CN114380562B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009234863A (en) * | 2008-03-27 | 2009-10-15 | Seia:Kk | Recycled aggregate concrete and method for producing the same |
CN109574567A (en) * | 2019-01-19 | 2019-04-05 | 江苏盛达飞建筑材料有限公司 | A kind of freeze proof regeneration concrete and preparation method thereof |
CN110256025A (en) * | 2019-06-25 | 2019-09-20 | 绍兴上虞南方普银混凝土有限公司 | Its regeneration concrete of a kind of preparation process of Aggregate of recycled concrete and application |
CN113429178A (en) * | 2021-07-20 | 2021-09-24 | 崇德建材集团有限公司 | Freeze-thaw resistant recycled concrete and preparation method thereof |
CN113354369A (en) * | 2021-07-23 | 2021-09-07 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
Non-Patent Citations (1)
Title |
---|
赵晓雅: ""改性淀粉/天然橡胶复合材料的性能研究"", 《广东化工》 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115448657A (en) * | 2022-08-23 | 2022-12-09 | 绍兴职业技术学院 | Pervious concrete containing porous hybrid fiber modified recycled aggregate and preparation method thereof |
CN115784687A (en) * | 2022-12-01 | 2023-03-14 | 宁波工程学院 | Wave-absorbing recycled concrete and preparation method thereof |
CN115784687B (en) * | 2022-12-01 | 2023-12-12 | 宁波工程学院 | Wave-absorbing recycled concrete and preparation method thereof |
CN116023099A (en) * | 2023-01-06 | 2023-04-28 | 扬州华运新材料科技有限公司 | Antifreezing recycled concrete and preparation method thereof |
CN116023099B (en) * | 2023-01-06 | 2024-05-24 | 扬州华运新材料科技有限公司 | Antifreezing recycled concrete and preparation method thereof |
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