CN115180881A - Environment-friendly high-strength concrete and preparation method thereof - Google Patents
Environment-friendly high-strength concrete and preparation method thereof Download PDFInfo
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- CN115180881A CN115180881A CN202210571459.1A CN202210571459A CN115180881A CN 115180881 A CN115180881 A CN 115180881A CN 202210571459 A CN202210571459 A CN 202210571459A CN 115180881 A CN115180881 A CN 115180881A
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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
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/122—Hydroxy amines
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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 application relates to the technical field of environment-friendly concrete, in particular to environment-friendly high-strength concrete and a preparation method thereof. The environment-friendly high-strength concrete is prepared from the following raw materials in parts by weight: 320-400 parts of cement; 80-120 parts of fly ash; 400-600 parts of sand; 300-500 parts of fine stone; 100-180 parts of water; 3-8 parts of a water reducing agent; 2-5 parts of a reinforcing agent; 500-800 parts of modified recycled aggregate; the preparation steps of the modified recycled aggregate are as follows: a. preparing prefabricated emulsified asphalt; b. preparing prefabricated crushed powder; c. and (5) coating and modifying. The application of the environment-friendly concrete effectively improves the defects of the original waste recycled aggregate through the special modification treatment process of the waste concrete and the waste bricks, thereby endowing the concrete with the advantages of environmental protection and high strength.
Description
Technical Field
The application relates to the technical field of environment-friendly concrete, in particular to environment-friendly high-strength concrete and a preparation method thereof.
Background
In recent years, with popularization of urban and rural areas and continuous iteration of infrastructure, the demand of cement concrete is greatly increased, but mine resources such as natural sand, stone and the like required for producing concrete are non-renewable resources, so that the development and utilization of construction wastes such as waste concrete, waste bricks and the like are urgently needed to be accelerated, and the development of environment-friendly concrete containing recycled aggregate is mainly aimed at the present.
The environment-friendly concrete in the related art comprises aggregate, recycled aggregate and cement paste, wherein sand and stone play a role of a skeleton in the concrete and are called as the aggregate; the crushed waste concrete and waste brick blocks play a supporting role and are called as recycled aggregate; the cement and water form cement paste, and the cement paste wraps the surfaces of the aggregate and the recycled aggregate and fills gaps of the aggregate and the recycled aggregate.
The environment-friendly concrete is easy to construct, and multiple components can be cemented into a solid whole after being mixed and hardened, and meet the daily application requirements. However, the strength and elastic modulus of the waste recycled aggregate which is only subjected to crushing treatment are only 2/3 of those of natural aggregate concrete, and the waste recycled aggregate has a rough surface and poor multi-edge bonding performance, so that the development of high-strength environment-friendly asphalt concrete is urgently needed.
Disclosure of Invention
In order to endow the asphalt concrete with excellent mechanical properties and simultaneously have the advantages of environmental protection, thereby reducing the load and waste of non-renewable resources, the application provides the environment-friendly high-strength concrete and the preparation method thereof.
In a first aspect, the present application provides an environment-friendly high-strength concrete, which adopts the following technical scheme:
the environment-friendly high-strength concrete is characterized in that the preparation raw materials comprise the following components in parts by weight:
320-400 parts of cement;
80-120 parts of fly ash;
400-600 parts of sand;
300-500 parts of fine stone;
100-180 parts of water;
2-5 parts of a reinforcing agent;
500-800 parts of modified recycled aggregate;
the preparation steps of the modified recycled aggregate are as follows:
a. preparing the precast emulsified asphalt: firstly, premixing acrylic latex, cyclodextrin and asphalt, adding polyvinyl alcohol and an anionic asphalt emulsifier, and further heating and mixing to obtain prefabricated emulsified asphalt;
b. preparing prefabricated crushed powder: then putting the waste bricks or waste concrete into a sandstone crusher for grinding to prepare crushed powder with the particle size of less than 25mm, and carrying out acid washing and calcination to obtain prefabricated crushed powder for later use;
c. coating modification treatment: and then uniformly mixing the prefabricated emulsified asphalt in the step a and the prefabricated crushed powder in the step b, adding a porous material for mixing, crushing and cutting the mixture into particles with the particle size of 5-25mm after uniform mixing and solidification, namely the modified recycled aggregate.
By adopting the technical scheme, the modified recycled aggregate prepared by the preparation processes of crushing, pickling, calcining, coating with the pre-prepared emulsified asphalt and the like has compact and porous surface, no impurity interference and weak alkalinity, so that the modified recycled aggregate is easily and tightly combined with the pre-prepared emulsified asphalt, and the elastic modulus and the compressive strength of the recycled aggregate are obviously improved by coating with the pre-prepared emulsified asphalt.
When the modified recycled aggregate is compounded with other components of concrete, the cemented structure is firmer, and simultaneously the recycled aggregate is not easy to directly contact with cement, thereby reducing the occurrence of alkali aggregate reaction.
Preferably, the specific steps of a are as follows:
firstly, premixing acrylic latex, cyclodextrin and asphalt at 120-140 ℃ at 2000-3000r/min for 10-30min, then adding polyvinyl alcohol and anionic asphalt emulsifier, further heating to 130-160 ℃, and continuously stirring at 1000-2000r/min for 5-15min to obtain the prefabricated emulsified asphalt.
Preferably, the weight ratio of the acrylic latex, the cyclodextrin, the asphalt, the polyvinyl alcohol and the anionic asphalt emulsifier in the component a is 1 (0.5-0.8): 1-2: (0.2-0.3): 0.1-0.2.
By adopting the technical scheme, the acrylic latex, the cyclodextrin and the asphalt which are treated by the process are mutually cross-linked and interpenetrated to form a composite emulsified asphalt system with better adhesive property and bonding property, in addition, the polyvinyl alcohol can be partially embrittled to provide bonding sites which are closely adhered with recycled aggregates for the prefabricated emulsified asphalt, and the modification effect of the prefabricated emulsified asphalt is further ensured.
Preferably, the specific steps of b are as follows:
b1 Firstly, putting the waste bricks or waste concrete into a sand crusher for grinding to prepare crushed powder with the particle size of less than 25 mm;
b2 ) soaking in acetic acid aqueous solution with pH of 2.5-3.5 for 1-2 hr, and oven drying;
b3 Then calcining the acid-washed and dried crushed powder at 1000-1200 ℃ for 2-3h, recharging inert gas, and cooling to room temperature at the cooling rate of 600-800 ℃/min to obtain prefabricated crushed powder for later use.
By adopting the technical scheme, the combined modification effect of the crushed powder treated by the process and the prefabricated emulsified asphalt is remarkably improved, and then the mechanical property of the concrete can be cooperatively ensured when the crushed powder is applied to a concrete system, and the reason for analyzing the mechanical property is probably that surface impurities are basically removed after acid washing, and the alkalinity is remarkably reduced; in addition, compact and porous surfaces are formed in the calcining process, so that the modification effect of the subsequent recycled aggregate, and the elastic modulus and the compressive strength of the recycled aggregate are guaranteed.
Preferably, the weight ratio of the pre-prepared emulsified asphalt to the pre-prepared crushed powder to the porous material in the step c is 1 (2-3) to (0.3-0.5).
By adopting the technical scheme, the compound effect of the components of the prefabricated emulsified asphalt, the prefabricated crushed powder and the porous material in the proportion is optimal, and the reason for analyzing the compound effect is probably that the prefabricated crushed powder in the proportion is combined and coated with the prefabricated emulsified asphalt and the porous material most fully.
Preferably, the porous material is one or more of calcium chloride, activated carbon and micro silicon powder.
By adopting the technical scheme, the calcium chloride, the activated carbon and the micro silicon powder are all porous micro structures, can form a better interface with concrete after being combined on the cladding liquid, and are combined with the cement more tightly and firmly, so that the tensile strength and the crack resistance of the concrete are ensured.
Preferably, the reinforcing agent is one or more of triethanolamine, acrylic acid graft modified epoxy resin and sulfonate.
By adopting the technical scheme, the reinforcing agent of the component can effectively react with unhydrated cement and cement hydration byproducts such as calcium hydroxide to generate a cobweb-shaped calcium stone crystal network, and the strength and the hardness of concrete are synergistically enhanced by matching with the use of the modified recycled aggregate.
In a second aspect, the present application provides a method for preparing an environment-friendly high-strength concrete, which adopts the following technical scheme: the preparation method of the environment-friendly high-strength concrete comprises the following steps:
s1, uniformly mixing fly ash, sand and fine stone to obtain a mixture A;
s2, uniformly mixing the cement and the modified recycled aggregate to obtain a mixture B;
and S3, mixing the mixture A and the mixture B, adding water and a reinforcing agent, and stirring and mixing the mixture A and the mixture B until the mixture A and the mixture B are uniformly pasty to obtain the environment-friendly high-strength concrete.
The environment-friendly high-strength concrete prepared by adopting the technical scheme has uniform and stable performance, excellent mechanical property and environmental benefit, and easy control and achievement of various production conditions, thereby realizing industrialized mass production.
In summary, the present application has the following beneficial effects:
1. the environment-friendly concrete effectively overcomes the defects of the original waste recycled aggregate through a special modification treatment process of waste concrete and waste bricks, thereby endowing the concrete with the advantages of environmental protection and high strength;
2. the effect of combining and modifying the crushed powder treated by the pickling and calcining processes with the prefabricated emulsified asphalt is obviously improved, and then the mechanical property of the concrete can be cooperatively guaranteed when the crushed powder is applied to a concrete system;
3. the reinforcing agent can effectively react with unhydrated cement and cement hydration byproducts such as calcium hydroxide to generate a cobweb-shaped calcareous crystal network, and the strength and hardness of concrete are synergistically enhanced by matching with the modified recycled aggregate; 4. the preparation method is simple, various conditions are easy to control and achieve, and meanwhile, raw materials are easy to obtain, so that the method is suitable for large-scale industrial production, and the prepared environment-friendly high-strength concrete is stable in performance and has excellent mechanical properties and environmental protection benefits.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in the examples of the present application are commercially available, except for the following specific descriptions:
acrylic latex, CAS 25777-14-4; beta-cyclodextrin, CAS 7585-39-9; bitumen, CAS 8052-42-4; anionic asphalt emulsifier, model 803Y.
Preparation examples
Preparation example 1
The preparation method of the modified recycled aggregate comprises the following steps:
a. preparing pre-emulsified asphalt:
premixing acrylic acid latex, cyclodextrin and asphalt at 120 deg.C at 3000r/min for 30min, adding polyvinyl alcohol and anionic asphalt emulsifier, further heating to 130 deg.C, and continuously stirring at 2000r/min for 15min to obtain prefabricated emulsified asphalt;
the weight ratio of the acrylic latex to the cyclodextrin to the asphalt to the polyvinyl alcohol to the anionic asphalt emulsifier in the step a is 1;
b. preparing prefabricated crushed powder:
b1 Firstly, putting the waste bricks or waste concrete into a sand crusher for grinding to prepare crushed powder with the particle size of less than 25 mm;
b2 ) soaking in acetic acid aqueous solution with pH of 2.5 for 1h, and drying;
b3 Then calcining the acid-washed and dried crushed powder at 1000 ℃ for 2h, recharging inert gas, and cooling to room temperature at the cooling rate of 600 ℃/min to obtain prefabricated crushed powder for later use;
c. coating modification treatment: then uniformly mixing the prefabricated emulsified asphalt in the step a and the prefabricated crushed powder in the step b, adding a porous material for mixing, crushing and cutting the mixture into particles with the average particle size of 20mm after uniform mixing and solidification, namely the modified recycled aggregate;
the weight ratio of the pre-emulsified asphalt to the pre-crushed powder to the porous material in step c is 1.
Preparation example 2
A modified recycled aggregate is different from the preparation example 1 in that the specific steps of a are as follows: acrylic latex, cyclodextrin and asphalt are premixed for 20min at the temperature of 130 ℃ at the speed of 2500r/min, polyvinyl alcohol and an anionic asphalt emulsifier are added, the temperature is further raised to 145 ℃, and the mixture is continuously stirred for 10min at the speed of 1500r/min, so that the pre-emulsified asphalt is obtained.
Preparation example 3
A modified recycled aggregate is different from the preparation example 1 in that the specific steps of a are as follows: acrylic latex, cyclodextrin and asphalt are premixed for 10min at 140 ℃ at 2000r/min, polyvinyl alcohol and anionic asphalt emulsifier are added, and the mixture is further heated to 160 ℃ and continuously stirred for 5min at 1000r/min, so that the pre-prepared emulsified asphalt is obtained.
Preparation example 4
A modified recycled aggregate is different from the preparation example 1 in that the specific steps of a are as follows: acrylic latex, cyclodextrin and asphalt are premixed for 10min at 160 ℃ at 1000r/min, then polyvinyl alcohol and anionic asphalt emulsifier are added, and the temperature is further raised to 180 ℃ and the mixture is continuously stirred for 10min at 1000r/min, thus obtaining the pre-prepared emulsified asphalt.
Preparation example 5
A modified recycled aggregate, which is different from preparation example 1 in that the weight ratio of the acrylic latex, the cyclodextrin, the asphalt, the polyvinyl alcohol and the anionic asphalt emulsifier in the component a is 1.
Preparation example 6
A modified recycled aggregate, which is different from preparation example 1 in that the weight ratio of the acrylic latex, the cyclodextrin, the asphalt, the polyvinyl alcohol and the anionic asphalt emulsifier in the component a is 1.6.
Preparation example 7
A modified recycled aggregate, which is different from preparation example 1 in that the weight ratio of the acrylic latex, the cyclodextrin, the asphalt, the polyvinyl alcohol and the anionic asphalt emulsifier in the component a is 1.
Preparation example 8
A modified recycled aggregate, which is different from the preparation example 1 in that the weight ratio of the acrylic latex, the cyclodextrin, the asphalt, the polyvinyl alcohol and the anionic asphalt emulsifier in the component a is 1.
Preparation example 9
A modified recycled aggregate is different from the preparation example 1 in that the specific steps of b are as follows:
b1 Firstly, putting the waste bricks or waste concrete into a sand crusher for grinding to prepare crushed powder with the particle size of less than 25 mm;
b2 ) soaking in acetic acid aqueous solution with pH of 3.0 for 1.5h, and drying;
b3 Then calcining the acid-washed and dried crushed powder at 1100 ℃ for 2.5h, recharging inert gas, and cooling to room temperature at the cooling rate of 700 ℃/min to obtain prefabricated crushed powder for later use.
Preparation example 10
A modified recycled aggregate is different from the preparation example 1 in that the specific steps of b are as follows:
b1 Firstly, putting the waste bricks or waste concrete into a sand crusher for grinding to prepare crushed powder with the particle size of less than 25 mm;
b2 ) soaking in acetic acid water solution with pH of 3.5 for 2 hr, and oven drying;
b3 Then calcining the acid-washed and dried crushed powder at 1200 ℃ for 3h, recharging inert gas, and cooling to room temperature at the cooling rate of 800 ℃/min to obtain prefabricated crushed powder for later use.
Preparation example 11
A modified recycled aggregate is different from the preparation example 1 in that the specific steps of b are as follows:
b1 Firstly, putting the waste bricks or waste concrete into a sand crusher for grinding to prepare crushed powder with the particle size of less than 25 mm;
b2 ) soaking in acetic acid aqueous solution with pH of 5.0 for 3 hr, and oven drying;
b3 Then calcining the acid-washed and dried crushed powder at 1500 ℃ for 2h, recharging inert gas, and cooling to room temperature at a cooling rate of 500 ℃/min to obtain prefabricated crushed powder for later use.
Preparation example 12
A modified recycled aggregate, which is different from preparation example 1 in that the weight ratio of the pre-emulsified asphalt, the pre-crushed powder and the porous material in c is 1.
Preparation example 13
A modified recycled aggregate, which is different from preparation example 1 in that the weight ratio of the pre-emulsified asphalt, the pre-crushed powder and the porous material in c is 1.
Preparation example 14
A modified recycled aggregate, which is different from the preparation example 1 in that the weight ratio of the pre-prepared emulsified asphalt, the pre-crushed powder and the porous material in c is 1.
Preparation example 15
A modified recycled aggregate, which is different from the preparation example 1 in that the weight ratio of the pre-prepared emulsified asphalt, the pre-crushed powder and the porous material in c is 1.
Preparation example 16
A modified recycled aggregate is different from the preparation example 1 in that the porous material consists of calcium chloride and activated carbon according to the weight ratio of 1.
Preparation example 17
A modified recycled aggregate is different from the preparation example 1 in that the porous material consists of silica fume and activated carbon according to the weight ratio of 1.
Preparation example 18
A modified recycled aggregate is different from the preparation example 1 in that the porous material consists of calcium chloride, activated carbon and silica fume in a weight ratio of 1.
Performance test
The concrete prepared in the examples and the comparative examples is taken as a test object, and after curing for 28 days, the compressive strength, the splitting tensile strength and whether cracks are generated on the surface of each group of samples are tested, and the length of the cracks is recorded, wherein the test sample is a cube standard sample of 150mm.
The compressive strength and the cleavage compressive strength were measured according to GB/T50081-2002 "method for testing mechanical Properties of ordinary concrete", and the average values of the results were recorded in the following table.
Examples
Examples 1 to 6
An environment-friendly high-strength concrete, which comprises the following raw material components and the corresponding weights thereof shown in the table 1 (in terms of per 100 kg), and is prepared by the following steps:
s1, firstly, stirring the fly ash, the sand and the fine stone at 2000r/min for 10min until the fly ash, the sand and the fine stone are uniformly mixed to obtain a mixture A;
s2, stirring cement and the modified recycled aggregate prepared in the preparation example 1 at 1000r/min for 10min until uniformly mixing to obtain a mixture B;
s3, stirring the mixture A and the mixture B for 20min at 2000r/min until the mixture is uniformly mixed, adding water and a reinforcing agent, and stirring and mixing until the mixture is uniformly pasty to obtain the environment-friendly high-strength concrete;
wherein the reinforcing agent is compounded by triethanolamine and sulfonate according to the weight ratio of 1.
TABLE 1 Components and weights (kg) thereof in examples 1-6
Comparative example 1
An environment-friendly high-strength concrete is different from the concrete in example 1 in that the recycled aggregate added into the concrete is waste concrete or waste bricks which are only subjected to crushing treatment.
The environmental-friendly high-strength concrete prepared in the above examples 1 to 6 and comparative example 1 was extracted, and the compression strength (Mpa) and the tensile strength at split (Mpa) were measured according to the above measurement procedures and measurement standards, and the average values of the measurement results were recorded in the following table: results of Performance test of examples 1 to 6 and comparative example 1
As can be seen from the above table, the environment-friendly high-strength concrete prepared in the examples 1 to 6 has excellent mechanical properties and no crack, and the compressive strength of the environment-friendly high-strength concrete is as high as 42.14 to 44.65Mpa, which is improved by 24.4 to 31.5 percent compared with that of the environment-friendly high-strength concrete prepared in the comparative example 1; the splitting tensile strength is as high as 3.57-3.75Mpa, which is improved by 14.8-20.6% compared with that of comparative example 1;
therefore, the environment-friendly high-strength concrete prepared from the cement, the fly ash, the sand, the fine stone, the water, the reinforcing agent and the modified recycled aggregate has excellent performance, and can be applied to buildings needing high strength in infrastructure, such as foundations;
the reason for analyzing the above is probably that the structure body formed by cementing the modified recycled aggregate after being compounded with other components of the concrete is firmer, and the recycled aggregate is not easy to directly contact with the cement, so that the occurrence of alkali aggregate reaction is reduced, and the ultimate tensile value or the ultimate tensile strength of the concrete is synergistically enhanced.
Examples 7 to 13
The environment-friendly high-strength concrete is different from the environment-friendly high-strength concrete in example 1 in that the modified recycled aggregate is different in use condition, and the specific corresponding relation is shown in the table below.
Table: comparative table of use of modified recycled aggregate in examples 7 to 13
| Group of | Modified recycled aggregate |
| Example 7 | Prepared from preparation example 2 |
| Example 8 | Prepared from preparation example 3 |
| Example 9 | Prepared from preparation example 4 |
| Example 10 | Prepared from preparation example 5 |
| Example 11 | Prepared from preparation example 6 |
| Example 12 | Prepared from preparation example 7 |
| Example 13 | Prepared from preparation example 8 |
The environmental-friendly high-strength concrete prepared in the above examples 7 to 13 was extracted, the compressive strength (Mpa) and the tensile strength at cleavage (Mpa) thereof were measured according to the above measurement procedures and measurement standards, and the average values of the measurement results were recorded in the following table.
Table (b): examples 7-13 results of Performance testing
As can be seen from the above table, the environment-friendly high-strength concrete prepared in the embodiments 1 and 7 to 13 has excellent mechanical properties, no crack is generated, and the compressive strength is as high as 41.78-42.81Mpa; the splitting tensile strength is as high as 3.55-3.68MPa;
therefore, the acrylic latex, the cyclodextrin and the asphalt which are treated by the process are mutually cross-linked and interpenetrated to form a composite emulsified asphalt system with better adhesive property and bonding property, and in addition, the polyvinyl alcohol can be partially embrittled to provide bonding sites for the prefabricated emulsified asphalt to be closely adhered with recycled aggregates, so that the modification effect of the prefabricated emulsified asphalt is further ensured.
In addition, as can be seen from examples 1 and 7 to 9, the acrylic latex, cyclodextrin and asphalt treated by the above processes after being treated by the above process conditions have stable performance of the composite emulsified asphalt system, and are not easy to affect the final performance when being applied to aggregate modification.
From examples 1 and 10-13, it can also be seen that examples 10-12 are preferred examples, and when the weight ratio of the acrylic latex to the cyclodextrin to the asphalt to the polyvinyl alcohol to the anionic asphalt emulsifier in a is 1 (0.5-0.8) to (1-2) to (0.2-0.3) to (0.1-0.2), the performance of the composite emulsified asphalt system is optimal, and the elastic modulus and compressive strength of recycled aggregate can be significantly improved by coating and combining after the modified aggregate is applied.
Examples 14 to 16
The environment-friendly high-strength concrete is different from the environment-friendly high-strength concrete in example 1 in the use condition of the modified recycled aggregate, and the specific corresponding relation is shown in the table below.
Table (b): comparative table of use of modified recycled aggregate in examples 14 to 16
| Group of | Modified recycled aggregate |
| Example 14 | Prepared from preparation example 9 |
| Example 15 | Prepared from preparation example 10 |
| Example 16 | Prepared from preparation example 11 |
The environmental-friendly high-strength concrete prepared in the above examples 14 to 16 was extracted, and the compression strength (Mpa) and the split tensile strength (Mpa) were measured according to the above measurement procedures and measurement standards, and the average values of the measurement results were recorded in the following table.
Table: examples 14 to 16 results of measuring the Properties
As can be seen from the above table, the environment-friendly high-strength concrete prepared in the examples 1 and 14 to 16 has excellent mechanical properties, no crack is generated, and the compressive strength is as high as 42.14 to 42.35Mpa; the splitting tensile strength is as high as 3.57-3.68MPa;
therefore, the combined modification effect of the crushed powder treated by the process and the prefabricated emulsified asphalt is obviously improved, and the mechanical property of the concrete can be cooperatively guaranteed when the crushed powder is applied to a concrete system;
the reason for this analysis may be that the surface impurities are substantially removed after pickling, while the alkalinity is significantly reduced; in the calcining process, compact and porous surfaces are formed, so that the modification effect of the subsequent recycled aggregate, and the elastic modulus and the compressive strength of the recycled aggregate are guaranteed.
However, since the final properties depend on the coated pre-emulsified asphalt, the optimum operating conditions for the process are considered to be the combination of production cost and performance improvement rate, and as can be seen from the above table, the performance is not affected substantially but is obviously not beneficial to the actual production after the temperature is increased.
Examples 17 to 20
The environment-friendly high-strength concrete is different from the environment-friendly high-strength concrete in example 1 in the use condition of the modified recycled aggregate, and the specific corresponding relation is shown in the table below.
Table: comparative table of use of modified recycled aggregate in examples 17 to 20
| Group of | Modified recycled aggregate |
| Example 17 | Prepared from preparation example 12 |
| Example 18 | Obtained by preparation example 13 |
| Example 19 | Prepared from preparation 14 |
| Example 20 | Prepared from preparation example 15 |
The environmental-friendly high-strength concrete prepared in the above examples 17 to 20 was extracted, and the compression strength (Mpa) and the split tensile strength (Mpa) were measured according to the above measurement procedures and measurement standards, and the average values of the measurement results were recorded in the following table.
Table: examples 17 to 20 results of testing the Properties
As can be seen from the above table, the environment-friendly high-strength concrete prepared in the examples 1 and 17 to 20 has excellent mechanical properties, no crack is generated, and the compressive strength is as high as 42.14 to 43.16Mpa; the splitting tensile strength is as high as 3.57-3.78Mpa;
the compound effect of the components of the pre-prepared emulsified asphalt, the pre-prepared crushed powder and the porous material in the proportion is optimal, and the reason for analyzing the compound effect is probably that the pre-prepared crushed powder in the proportion is most fully combined and coated with the pre-prepared emulsified asphalt and the porous material; namely, the embodiment 17-19 is the preferred embodiment, when the weight ratio of the pre-emulsified asphalt, the pre-crushed powder and the porous material in the step c is 1 (2-3) to (0.3-0.5), the elastic modulus and the compressive strength of the pre-crushed powder are remarkably improved after the pre-crushed powder is coated by the combination of the pre-emulsified asphalt and the porous material.
Examples 21 to 23
The environment-friendly high-strength concrete is different from the environment-friendly high-strength concrete in example 1 in that the modified recycled aggregate is different in use condition, and the specific corresponding relation is shown in the table below.
Table: comparative table of use of modified recycled aggregate in examples 21 to 23
| Group of | Modified recycled aggregate |
| Example 21 | Prepared from preparation example 16 |
| Example 22 | Prepared from preparation example 17 |
| Example 23 | Prepared from preparation 18 |
The environmental-friendly high-strength concrete prepared in the above examples 21 to 23 was extracted, and the compression strength (Mpa) and the split tensile strength (Mpa) were measured according to the above measurement procedures and measurement standards, and the average values of the measurement results were recorded in the following table.
Table (b): examples 21 to 23 results of testing the Properties
As can be seen from the above table, the environment-friendly high-strength concrete prepared in the embodiments 1 and 21 to 23 has excellent mechanical properties, no crack is generated, and the compressive strength is as high as 42.02 to 42.18Mpa; the splitting tensile strength is as high as 3.53-3.61MPa;
it can be seen that the calcium chloride, the activated carbon and the silica fume with the porous and fine structure in the proportion can form a better interface with concrete after being combined on the cladding liquid, and the combination with the cement is tighter and firmer, so that the tensile strength and the crack resistance of the concrete are ensured, wherein the three components have a certain compounding effect when being used simultaneously, see example 23.
Example 24
An environment-friendly high-strength concrete is different from the concrete in the embodiment 1 in that a reinforcing agent is prepared by compounding triethanolamine and acrylic acid graft modified epoxy resin according to the weight ratio of 1.
Example 25
An environment-friendly high-strength concrete is different from the concrete in the embodiment 1 in that a reinforcing agent is prepared by compounding triethanolamine, acrylic acid graft modified epoxy resin and sulfonate according to the weight ratio of 1.
The environmental-friendly high-strength concrete prepared in the above examples 24 to 25 was extracted, the compressive strength (Mpa) and the tensile strength at cleavage (Mpa) thereof were measured according to the above measurement procedures and measurement standards, and the average values of the measurement results were recorded in the following table.
Table: examples 24 to 25 results of testing the Properties
As can be seen from the above table, the environment-friendly high-strength concrete prepared in the embodiments 1 and 24 to 25 has excellent mechanical properties, no crack is generated, and the compressive strength is as high as 42.10-42.28Mpa; the splitting tensile strength is as high as 3.57-3.65Mpa;
therefore, the reinforcing agents of the components can effectively enhance the strength and the hardness of concrete, and the analysis reason may be that the reinforcing agents can react with unhydrated cement and cement hydration byproducts such as calcium hydroxide to generate a cobweb-like calcareous stone crystal network, so that the mechanical properties of a concrete matrix are guaranteed, wherein the components have a certain compounding effect when being used simultaneously, see example 25.
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 environment-friendly high-strength concrete is characterized in that the preparation raw materials comprise the following components in parts by weight:
320-400 parts of cement;
80-120 parts of fly ash;
400-600 parts of sand;
300-500 parts of fine stone;
100-180 parts of water;
2-5 parts of a reinforcing agent;
500-800 parts of modified recycled aggregate;
the preparation steps of the modified recycled aggregate are as follows:
a. preparing pre-emulsified asphalt: firstly, premixing acrylic latex, cyclodextrin and asphalt, adding polyvinyl alcohol and an anionic asphalt emulsifier, and further heating and mixing to obtain prefabricated emulsified asphalt;
b. preparing prefabricated crushed powder: then putting the waste bricks or waste concrete into a sandstone crusher for grinding to prepare crushed powder with the particle size of less than 25mm, and carrying out acid washing and calcination to obtain prefabricated crushed powder for later use;
c. modification treatment: and then uniformly mixing the prefabricated emulsified asphalt in the step a and the prefabricated crushed powder in the step b, adding a porous material for mixing, crushing and cutting the mixture into particles with the particle size of 5-25mm after uniformly mixing and solidifying, namely the modified recycled aggregate.
2. The environment-friendly high-strength concrete according to claim 1, wherein the specific steps of a are as follows:
acrylic latex, cyclodextrin and asphalt are premixed for 10-30min at the temperature of 120-140 ℃ at the speed of 2000-3000r/min, then polyvinyl alcohol and anionic asphalt emulsifier are added, and the temperature is further raised to 130-160 ℃ and continuously stirred for 5-15min at the speed of 1000-2000r/min, thus obtaining the pre-prepared emulsified asphalt.
3. The environment-friendly high-strength concrete according to claim 2, wherein the weight ratio of the acrylic latex, the cyclodextrin, the asphalt, the polyvinyl alcohol and the anionic asphalt emulsifier in the component a is 1 (0.5-0.8): 1-2): 0.2-0.3): 0.1-0.2.
4. The environment-friendly high-strength concrete according to claim 1, wherein the specific steps of b are as follows:
b1 Firstly, putting the waste bricks or waste concrete into a sand crusher for grinding to prepare crushed powder with the particle size of less than 25 mm;
b2 ) soaking in acetic acid aqueous solution with pH of 2.5-3.5 for 1-2 hr, and oven drying;
b3 Then calcining the acid-washed and dried crushed powder at 1000-1200 ℃ for 2-3h, then filling inert gas, and cooling to room temperature at the cooling rate of 600-800 ℃/min to obtain the prefabricated crushed powder for later use.
5. The environment-friendly high-strength concrete as claimed in claim 1, wherein the weight ratio of the pre-emulsified asphalt, the pre-crushed powder and the porous material in the step c is 1 (2-3) to (0.3-0.5).
6. The environment-friendly high-strength concrete according to claim 1, wherein the porous material is one or more of calcium chloride, activated carbon and silica fume.
7. The environment-friendly high-strength concrete according to claim 1, wherein the reinforcing agent is one or more of triethanolamine, acrylic acid graft modified epoxy resin and sulfonate.
8. The method for preparing environment-friendly high-strength concrete according to any one of claims 1 to 7, characterized by comprising the steps of:
s1, uniformly mixing fly ash, sand and fine stone to obtain a mixture A;
s2, uniformly mixing the cement and the modified recycled aggregate to obtain a mixture B;
and S3, mixing the mixture A and the mixture B, adding water and a reinforcing agent, and stirring and mixing the mixture A and the mixture B until the mixture A and the mixture B are uniformly pasty to obtain the environment-friendly high-strength concrete.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495586A (en) * | 2016-10-26 | 2017-03-15 | 重庆绿恒环保科技有限公司 | A kind of emulsified asphalt modification pervious concrete |
| WO2021113631A1 (en) * | 2019-12-04 | 2021-06-10 | Texas A&M University | Eco-friendly, crack-resistant cementitious materials |
| CN113004009A (en) * | 2021-04-24 | 2021-06-22 | 上海石化安东混凝土有限公司 | Environment-friendly high-strength concrete and preparation method thereof |
| CN113185219A (en) * | 2021-04-24 | 2021-07-30 | 上海石化安东混凝土有限公司 | Environment-friendly anti-cracking concrete and preparation method thereof |
| CN113200724A (en) * | 2021-06-11 | 2021-08-03 | 佛冈县诚康商品混凝土有限公司 | High-strength concrete and preparation method thereof |
| CN113387622A (en) * | 2021-06-30 | 2021-09-14 | 江苏晨马建筑科技有限公司 | High-strength recycled concrete and production process thereof |
| CN113501696A (en) * | 2021-07-30 | 2021-10-15 | 上海楼诚混凝土有限公司 | Environment-friendly anti-permeability concrete and preparation method thereof |
-
2022
- 2022-05-24 CN CN202210571459.1A patent/CN115180881B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495586A (en) * | 2016-10-26 | 2017-03-15 | 重庆绿恒环保科技有限公司 | A kind of emulsified asphalt modification pervious concrete |
| WO2021113631A1 (en) * | 2019-12-04 | 2021-06-10 | Texas A&M University | Eco-friendly, crack-resistant cementitious materials |
| CN113004009A (en) * | 2021-04-24 | 2021-06-22 | 上海石化安东混凝土有限公司 | Environment-friendly high-strength concrete and preparation method thereof |
| CN113185219A (en) * | 2021-04-24 | 2021-07-30 | 上海石化安东混凝土有限公司 | Environment-friendly anti-cracking concrete and preparation method thereof |
| CN113200724A (en) * | 2021-06-11 | 2021-08-03 | 佛冈县诚康商品混凝土有限公司 | High-strength concrete and preparation method thereof |
| CN113387622A (en) * | 2021-06-30 | 2021-09-14 | 江苏晨马建筑科技有限公司 | High-strength recycled concrete and production process thereof |
| CN113501696A (en) * | 2021-07-30 | 2021-10-15 | 上海楼诚混凝土有限公司 | Environment-friendly anti-permeability concrete and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 祝雯等: "再生骨料及再生混凝土技术的研究进展", 《广州建筑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504743A (en) * | 2022-10-20 | 2022-12-23 | 深圳市恒星建材有限公司 | Environment-friendly concrete and preparation method thereof |
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