CN113816674B - Recycled cement concrete with recycled waste asphalt and preparation method and application thereof - Google Patents
Recycled cement concrete with recycled waste asphalt and preparation method and application thereof Download PDFInfo
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- CN113816674B CN113816674B CN202111030693.5A CN202111030693A CN113816674B CN 113816674 B CN113816674 B CN 113816674B CN 202111030693 A CN202111030693 A CN 202111030693A CN 113816674 B CN113816674 B CN 113816674B
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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
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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
- C04B24/16—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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/36—Bituminous materials, e.g. tar, pitch
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling 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
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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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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- Engineering & Computer Science (AREA)
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- Environmental & Geological Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
A recycled cement concrete with recycled waste asphalt and a preparation method and application thereof comprise a component A, a component B, a component C, a component D and a component E, wherein: the component A consists of cementing material cement and reinforcing and toughening materials; the component B is coarse aggregate and fine aggregate for cement concrete; the component C is formed by mixing a waste asphalt mixture, a quick regenerant, emulsified asphalt and water; the component D is superplasticizer; the component E is a surfactant aqueous solution; the components are as follows according to the mass portion: 13-20 parts of component A, 60-80 parts of component B, 25-35 parts of component C, 1.28-1.98 parts of component D and 5-8 parts of component E. The invention can quickly regenerate the aged asphalt in the waste asphalt mixture, improves the performance of untight bonding at the interface of the waste asphalt mixture and cement, improves the workability and the compression and bending resistance of regenerated cement concrete, can be used for engineering components such as kerbs, slope protection building blocks and the like nearby, and has very wide application prospect.
Description
Technical Field
The invention belongs to the technical field of recycling application of building waste materials, and particularly relates to recycled cement concrete for recycling waste asphalt, and a preparation method and application thereof.
Background
In the built roads in China, the asphalt pavement accounts for more than 80 percent, and most of the asphalt pavements enter the major and middle repair stages, and the main treatment methods comprise the following steps: the above treatment methods often have the defects of resource waste, environmental pollution or low energy efficiency and utilization rate, etc.
If the asphalt pavement regeneration technology can be used for maintenance and repair of highways, the original pavement material can be recycled, the environment is protected, the construction cost is reduced, the defects of the original pavement material can be corrected, the structure of the original pavement is improved, and the service life of the pavement is prolonged. Therefore, a new concrete technology for recycling asphalt is urgently needed to solve the above problems.
Disclosure of Invention
Based on the defects and shortcomings in the prior art, the invention aims to provide the recycled cement concrete for recycling the waste asphalt, which effectively and reasonably utilizes the comprehensive utilization of waste materials such as the waste asphalt, carbon fiber waste filaments and carbon fiber production and recovery substances, can save a large amount of raw materials such as cement, sand stone and the like, and saves the engineering investment.
In order to realize the purpose, the invention adopts the technical scheme that:
the recycled cement concrete with recycled waste asphalt comprises a component A, a component B, a component C, a component D and a component E, wherein:
the component A consists of cementing material cement and reinforcing and toughening materials;
the component B is coarse aggregate and fine aggregate for cement concrete;
the component C is formed by mixing waste asphalt mixture, a quick regenerant, emulsified asphalt and water;
the component D is superplasticizer;
the component E is a surfactant aqueous solution;
the components are as follows according to the mass portion: 13-20 parts of component A, 60-80 parts of component B, 25-35 parts of component C, 1.28-1.98 parts of component D and 5-8 parts of component E.
Preferably, the component A comprises the following components in parts by weight: 12.888-19.886 parts of cement, 0.112-0.144 parts of reinforcing and toughening material, wherein the cement is 42.5-grade or above portland cement or ordinary portland cement; the reinforcing and toughening material is carbon fiber waste silk.
Preferably, the coarse aggregate is composed of limestone with the grain size of 20-30mm, 10-20mm and 5-10mm according to the proportion of 45; the fine aggregate is natural sand, and the sand rate is 31-35%; when the component B is stirred and mixed, coarse aggregates and fine aggregates are obtained by mixing according to the particle size proportion, and then the coarse and fine aggregates are distributed according to the part proportion.
Preferably, the component C comprises the following components in parts by weight: 20.94-24.916 parts of waste asphalt mixture, 0.06-0.084 part of quick regenerant, 0-4 parts of emulsified asphalt and 2-4 parts of water, wherein the quick regenerant is dimethyl sulfoxide which is a recycled product for producing carbon fibers; the waste asphalt mixture is classified in advance, waste asphalt mixture particles smaller than 5mm are removed, and the waste asphalt mixture particles are prepared by mixing four particle sizes of 5-10mm, 10-15mm, 15-20mm and 20-30mm according to a proportion of 20.
Preferably, the emulsified asphalt is cationic middle-cracked emulsified asphalt and is prepared by mixing asphalt, water, a composite emulsifier and a stabilizer; wherein, the asphalt accounts for more than 60 percent of the total mass of the emulsified asphalt; the composite emulsifier is two or more of alkylphenol polyoxyethylene ether sulfonated succinate, polyoxyethylene sorbitan stearic acid, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene; the stabilizer is polyvinyl alcohol.
Preferably, the superplasticizer of the component D is a mixture of prenyl alcohol polyoxyethylene ether, acrylic acid, acrylamide, hydrogen peroxide, ascorbic acid, thioglycolic acid, mercaptopropionic acid, sodium hydroxide, deionized water in a ratio of 43.72.
Preferably, the component E comprises the following components in parts by mass: 0.25-0.4 part of surfactant and 4.75-7.6 parts of water.
The invention also provides a preparation method of the recycled cement concrete with recycled waste asphalt, which comprises the following steps:
s1, preparing a component A: cutting the carbon fiber waste silk to a required length, and uniformly mixing the carbon fiber waste silk and cement in proportion;
s2, preparing a component C: drying the quick regenerant, uniformly spraying the quick regenerant on the surface of the waste asphalt mixture, pouring the quick regenerant into emulsified asphalt diluted with water in advance after the waste asphalt on the surface of the quick regenerant is dissolved, and uniformly stirring the quick regenerant and the emulsified asphalt together for 1-2min;
s3, preparing a component E: dissolving a surfactant in water in advance, and uniformly stirring for later use;
s4, mixing: dry-mixing the coarse and fine aggregates in the component B, premixing uniformly, adding half of the component E, stirring for 30s, adding the mixed component A, dissolving the component D in the other half of the component E, slowly adding the mixture into a stirrer, stirring for 2-3 minutes until the surface of concrete has obvious gloss, and preparing a base material;
and S5, adding the component C into the base material, stirring for 1-2min until the mixture is uniform to obtain the newly-mixed recycled cement concrete F, and measuring the performance index of the newly-mixed recycled cement concrete F.
The invention also provides application of the recycled cement concrete with recycled waste asphalt in recycled cement concrete curb engineering members.
Compared with the prior art, the invention has the beneficial effects that:
the cation emulsified asphalt is mixed with the waste asphalt mixture, so that the mixing property and the caking property of the waste asphalt mixture and other materials can be changed, the emulsified asphalt is subjected to chemical reaction with cement and mineral aggregate after emulsion breaking to form a stable three-dimensional structure, the degree of fit between new and old materials is enhanced, the prepared engineering component has enough breaking and compression strength, the compactness of concrete is enhanced, and the corrosion resistance and the freezing resistance of the engineering component are improved.
The waste silk produced and recycled by the carbon fiber is used as a reinforcing and toughening material to be doped into the recycled cement concrete, so that the treatment cost of the carbon fiber waste silk is reduced, the waste can be recycled, the weight of the concrete is reduced, the cement is saved, and the breaking and compression strength of the recycled concrete is improved.
The invention uses the dimethyl sulfoxide recovered from the carbon fiber production as a quick regenerant to regenerate the aged asphalt on the surface in the waste asphalt mixture, thereby not only reducing the treatment cost of the dimethyl sulfoxide, but also recycling the waste materials and improving the bonding property of the regenerated cement concrete.
The invention adopts the superplasticizer to mix the recycled cement concrete to improve the workability of the newly mixed recycled cement concrete.
The invention adopts the surfactant which is the same as that used for the production of the emulsified asphalt to be dissolved in water, thereby increasing the compatibility between the surfactant and the water.
According to the invention, the emulsified asphalt is used for modifying the surface of the waste asphalt mixture and then is mixed with the concrete, compared with the method that the waste asphalt mixture is directly mixed with the concrete, the utilization rate of the waste asphalt mixture is about 2 times higher on the basis that various index performances meet the standard requirements.
The quality of the engineering components such as the recycled cement concrete curb and the like prepared by the invention is greatly reduced, the economic cost caused by transportation is reduced by mixing the components on site, the environmental pollution is reduced by normal-temperature construction, and the resource application value of the waste asphalt concrete in the field of traffic buildings is improved.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain specific embodiments of the present invention. It is obvious that the following description is only of some embodiments of the invention and that other embodiments can be derived from these without inventive step for a person skilled in the art.
Example 1:
the recycled cement concrete for recycling the waste asphalt comprises a component A, a component B, a component C, a component D and a component E, wherein the components are prepared from the following components in parts by weight: 13-20 parts of component A, 60-80 parts of component B, 25-35 parts of component C, 1.28-1.98 parts of component D and 5-8 parts of component E.
Wherein:
the component A consists of cementing material cement and reinforcing and toughening materials, and the mass part ratio is as follows: 12.888 to 19.886 portions of cement and 0.112 to 0.144 portion of reinforcing and toughening material.
The cement is 42.5 grade or above Portland cement or ordinary Portland cement; the reinforcing and toughening material is waste carbon fiber.
The component B comprises coarse aggregate and fine aggregate for cement concrete, and the weight portion ratio is as follows: 32.5-52.5 parts of coarse aggregate and 27.5 parts of fine aggregate; the nominal maximum grain size of the coarse aggregate is not more than 30mm, and the nominal maximum grain size of the fine aggregate is not more than 5mm.
The coarse aggregate is composed of limestone with the grain diameter of 20-30mm, 10-20mm and 5-10mm according to the proportion of 45 to 20, and the crushing value is less than 20 percent; the fine aggregate is natural sand, and the sand rate is 31-35%. And when the component B is stirred and mixed, mixing the components according to the particle size proportion to obtain coarse aggregates and fine aggregates, and distributing the coarse aggregates and the fine aggregates according to the part ratio.
The component C is prepared by mixing a waste asphalt mixture, a quick regenerant, emulsified asphalt and water, and the mass part ratio is as follows: 20.94-24.916 parts of waste asphalt mixture, 0.06-0.084 parts of quick regenerating agent, 0-4 parts of emulsified asphalt and 2-4 parts of water.
The waste asphalt mixture is classified in advance, waste asphalt mixture particles smaller than 5mm are removed, and the waste asphalt mixture particles are prepared by mixing four particle sizes of 5-10mm, 10-15mm, 15-20mm and 20-30mm according to a proportion of 20.
The rapid regenerant is dimethyl sulfoxide which is a recycled product for producing carbon fibers.
The emulsified asphalt is cationic middle-cracked emulsified asphalt and is prepared by mixing asphalt, water, a composite emulsifier and a stabilizer; wherein, the asphalt accounts for more than 60 percent of the total mass of the emulsified asphalt; the composite emulsifier is two or more of alkylphenol polyoxyethylene ether sulfonated succinate, polyoxyethylene sorbitan stearic acid, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene; the stabilizer is polyvinyl alcohol.
The component D is a superplasticizer, and the superplasticizer is prepared by mixing isopentenol polyoxyethylene ether, acrylic acid, acrylamide, hydrogen peroxide, ascorbic acid, thioglycolic acid, mercaptopropionic acid, sodium hydroxide and deionized water according to a ratio of 43.72.
The component E is a surfactant aqueous solution, and the mass part ratio is as follows: 0.25-0.4 part of surfactant and 4.75-7.6 parts of water.
Example 2:
the embodiment relates to engineering components such as regenerated cement concrete kerbstones for recycling waste asphalt mixture, and the preparation method comprises the following steps:
s1, preparing a component A: 0.13 part of carbon fiber waste silk is cut to the required length and is uniformly mixed with 15 parts of cement according to a certain proportion.
S2, preparing a component C: after drying dimethyl sulfoxide, uniformly spraying 0.046 part of dimethyl sulfoxide on the surface of 23 parts of waste asphalt mixture until the waste asphalt on the surface is dissolved; diluting 2 parts of emulsified asphalt uniformly in advance by using 2 parts of water; pouring the former into the latter and stirring for 1-2min;
s3, preparation of an E component: 0.316 part of surfactant is dissolved in 6 parts of water in advance and uniformly stirred to prepare a surfactant aqueous solution for later use.
S4, mixing: pouring 40 parts of coarse aggregate and 27.5 parts of fine aggregate into a stirrer, uniformly premixing, adding a half of surfactant aqueous solution, stirring for 30s, and adding a mixture of cement and carbon fiber waste silk. Dissolving 0.15 part of superplasticizer in the rest of surfactant aqueous solution in advance, slowly adding into a stirrer, stirring for 2-3 minutes until the surface of concrete has obvious gloss, and preparing into a base material;
and S5, adding the component C into the base material, stirring for 1-2min until the mixture is uniform, obtaining the freshly mixed recycled cement concrete, measuring the workability, forming a test piece according to the standard requirement, standing at room temperature for 1 day, demoulding, wrapping with a plastic film, maintaining in a standard curing room, and measuring the indexes of the concrete, such as the breaking strength, the compressive strength, the freezing resistance, the salt freezing resistance and the like.
Example 3:
the preparation method of the engineering components such as the recycled cement concrete curb and the like by recycling the waste asphalt mixture comprises the following steps:
s1, preparing a component A: 0.119 part of carbon fiber waste silk is cut to the required length and is evenly mixed with 14.9 parts of cement according to a certain proportion.
S2, preparing a component C: after drying dimethyl sulfoxide, uniformly spraying 0.048 part of dimethyl sulfoxide on the surface of 24 parts of waste asphalt mixture until the waste asphalt on the surface is dissolved; diluting 3 parts of emulsified asphalt with 2.5 parts of water in advance to be uniform; pouring the former into the latter and stirring for 1-2min;
s3, preparation of the component E: 0.3 part of surfactant is dissolved in 5.7 parts of water in advance and is uniformly stirred to prepare a surfactant aqueous solution for later use.
S4, mixing: pouring 45 parts of coarse aggregate and 27.5 parts of fine aggregate into a stirrer, uniformly premixing, adding a half of surfactant aqueous solution, stirring for 30s, and adding a mixture of cement and carbon fiber waste silk. Dissolving 0.149 part of superplasticizer in the rest of surfactant aqueous solution in advance, slowly adding into a stirrer, stirring for 2-3 minutes until the surface of concrete has obvious gloss, and preparing into a base material;
and S5, adding the component C into the base material, stirring for 1-2min until the mixture is uniform, obtaining the freshly mixed recycled cement concrete, measuring the workability, forming a test piece according to the standard requirement, standing at room temperature for 1 day, demoulding, wrapping with a plastic film, maintaining in a standard curing room, and measuring the indexes of the concrete, such as the breaking strength, the compressive strength, the freezing resistance, the salt freezing resistance and the like.
Example 4:
the preparation method of the engineering components such as the recycled cement concrete curb and the like by recycling the waste asphalt mixture comprises the following steps:
s1, preparing a component A: 0.153 part of carbon fiber waste silk is cut to the required length and is evenly mixed with 19.09 parts of cement according to a certain proportion.
S2, preparation of a component C: after dimethyl sulfoxide is dried, 0.06 part of dimethyl sulfoxide is uniformly sprayed on the surface of 25 parts of waste asphalt mixture, and the waste asphalt on the surface is dissolved; diluting the 4-asphalt with 3% water in advance; pouring the former into the latter and stirring for 1-2min;
s3, preparation of the component E: 0.395 part of surfactant is dissolved in 7.5 parts of water in advance and uniformly stirred to prepare a surfactant aqueous solution for later use.
S4, mixing: and pouring 50 parts of coarse aggregate and 27.5 parts of fine aggregate into a stirrer, uniformly premixing, adding a half of surfactant aqueous solution, stirring for 30s, and adding a mixture of cement and carbon fiber waste silk. Dissolving 0.192 parts of superplasticizer in the residual aqueous solution of the surfactant in advance, slowly adding the solution into a stirrer, and stirring for 2-3 minutes until the surface of the coagulated solution has obvious gloss to prepare a base material;
and S5, adding the component C into the base material, stirring for 1-2min until the mixture is uniform, obtaining the freshly mixed recycled cement concrete, measuring the workability, forming a test piece according to the standard requirement, standing at room temperature for 1 day, demoulding, wrapping with a plastic film, maintaining in a standard curing room, and measuring the indexes of the concrete, such as the breaking strength, the compressive strength, the freezing resistance, the salt freezing resistance and the like.
Through the formula design of the invention, the test results of the workability and test piece performance of the recycled cement concrete for the resource application of the waste asphalt mixture prepared according to the raw material formula in the embodiments 2-4 are as follows:
from the above table, the engineering components such as the recycled cement concrete curb and the like, which are recycled by the waste asphalt mixture, have the following characteristics compared with the traditional engineering components such as the cement concrete curb and the like:
1. the emulsified asphalt has good mixing stability with water, has liquid characteristics and certain viscosity, and can be quickly and effectively coated on the surface of a waste asphalt mixture to be integrated with concrete. Since the emulsified asphalt is an oil-in-water type material, which contains part of water, and this part of water is subtracted during the concrete mix design process, in fact the water in the emulsified asphalt is not in the form of free water during the mixing process, in other words, the workability of the concrete is not improved, so that the workability of the recycled concrete is poor, the slump is low, and the insertion type mechanical vibration method must be adopted during the molding of the test piece.
2. Asphalt in the waste asphalt mixture has a certain degree of aging phenomenon, the performance of recycled concrete is improved to a certain degree by adding dimethyl sulfoxide and emulsified asphalt, but asphalt is a hydrophobic material, and a bonding interface between the asphalt and other materials in cement concrete is weak. Therefore, in a cement concrete system, the addition of the waste asphalt mixture can weaken the compressive strength of a concrete structure to a certain extent. As can be seen from the above table, with the increase of the mixing amount of the waste asphalt mixture, the compressive strength of the cement concrete is weakened, but the cement concrete meets the standard requirements and is far greater than the standard requirements.
3. The emulsified asphalt is a flexible material, the compressive strength of a concrete material is bound to be reduced while the bonding interface of the waste asphalt mixture and the cement mortar is improved, the compressive strength of the concrete is reduced along with the increase of the mixing amount of the emulsified asphalt and the reinforcing and toughening material, and the bending tensile strength of the concrete is increased along with the increase of the mixing amount of the emulsified asphalt and the reinforcing and toughening material.
4. The proper vibration mode is adopted during the molding of the recycled cement concrete, the compactness degree is improved, and the surface has no holes, so that the recycled concrete has excellent frost resistance and salt freezing resistance, and the water absorption rate also meets the standard requirement.
The main performances of engineering components such as the recycled cement concrete curb and the like in the resource application of the waste asphalt mixture meet the standard requirements, the weight is light, the difficulty in manufacturing and transportation is reduced, and the environmental pollution and the cost are reduced by using waste materials; the asphalt is flexible, the carbon fiber waste wire is flexible, the bending and pulling performance of the component is enhanced, the service life is long, the novel recycling mode is realized, the popularization and the application of the waste asphalt pavement resource recycling technology are promoted, the application additional value is improved, a certain application value is realized, a great effect is played in the field of traffic construction, and the market prospect is wide.
In the above embodiment and its alternative, the component A can be selected from 13-20 parts; the component B can be selected randomly from 60 to 80 parts; the component C can be arbitrarily selected from 25 to 35; the component D can be randomly selected from 1.28 to 1.98 parts; the component E can be arbitrarily selected from 5 to 8 parts.
In the above embodiment and its alternative, in the component A, the cement is 12.888-19.886 parts, the reinforcing and toughening material is 0.112-0.144 parts; the components can be selected randomly within the mass portion interval corresponding to each component.
In the above examples and their alternatives, in component B, the coarse aggregate is 32.5-52.5 parts and the fine aggregate is 27.5 parts; the components can be selected randomly within the mass portion interval corresponding to each component.
In the embodiment and the alternative scheme, in the component C, 20.94-24.916 parts of waste asphalt mixture, 0.06-0.084 parts of quick regenerant, 0-4 parts of emulsified asphalt and 2-4 parts of water are used; the components can be selected randomly within the mass portion interval corresponding to each component.
In the above examples and alternatives, the surfactant is present in an amount of 0.25 to 0.4 parts and the water is present in an amount of 4.75 to 7.6 parts in the E component.
In the above embodiment and the alternative scheme, the reinforcing and toughening material is mainly carbon fiber waste, is a product recovered from carbon fiber production, and has the characteristics of light weight, high strength, corrosion resistance and the like, and the chopped carbon fiber waste can reinforce cement, and is a new generation of reinforcing fiber.
In the above examples and alternatives, the coarse aggregate consists of limestone with a particle size of 20-30mm, 10-20mm, 5-10mm in a proportion of 45; the fine aggregate is natural sand, and the sand rate is 31-35%; when the component B is stirred and mixed, coarse aggregates and fine aggregates are obtained by mixing according to the particle size proportion, and then the coarse and fine aggregates are distributed according to the part proportion.
In the above embodiment and its alternative, the fast regenerating agent is mainly dimethyl sulfoxide, which is a recovered product from carbon fiber production, and is a sulfur-containing organic compound, colorless, odorless, transparent, viscous liquid at room temperature, and an organic solvent with high polarity.
In the above embodiment and its alternative, the waste asphalt mixture is classified in advance to remove particles of the waste asphalt mixture smaller than 5mm, and the waste asphalt mixture is prepared by mixing four particle sizes of 5-10mm, 10-15mm, 15-20mm, and 20-30mm in a ratio of 20.
In the above embodiment and its alternative, the emulsified asphalt is cationic middle-cracked emulsified asphalt, and is prepared from asphalt, water, a composite emulsifier, a stabilizer, and the like. Wherein the asphalt accounts for more than 60 percent of the total mass of the emulsified asphalt, the composite emulsifier is two or more of alkylphenol polyoxyethylene ether sulfonated succinate, polyoxyethylene sorbitan stearate, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene, and the stabilizer is polyvinyl alcohol.
In the above examples and alternatives, the superplasticizer is a mixture of prenyl alcohol polyoxyethylene ether, acrylic acid, acrylamide, hydrogen peroxide, ascorbic acid, thioglycolic acid, mercaptopropionic acid, sodium hydroxide, deionized water in the ratio of 43.72.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (6)
1. The recycled cement concrete for recycling the waste asphalt is characterized by comprising a component A, a component B, a component C, a component D and a component E, wherein:
the component A consists of cementing material cement and reinforcing and toughening materials;
the component A comprises the following components in parts by mass: 12.888 to 19.886 parts of cement and 0.112 to 0.144 part of reinforcing and toughening material, wherein the cement is 42.5 grade or above portland cement or ordinary portland cement; the reinforcing and toughening material is waste carbon fiber;
the component B is coarse aggregate and fine aggregate;
the component C is formed by mixing a waste asphalt mixture, a quick regenerant, emulsified asphalt and water;
the component C comprises the following components in parts by mass: 20.94-24.916 parts of waste asphalt mixture, 0.06-0.084 parts of quick regenerating agent, 0-4 parts of emulsified asphalt and 2-4 parts of water;
the rapid regenerant is dimethyl sulfoxide which is a recovered product for producing carbon fibers;
the waste asphalt mixture is classified in advance, waste asphalt mixture particles smaller than 5mm are removed, and the waste asphalt mixture particles are prepared by mixing four particle sizes of 5-10mm, 10-15mm, 15-20mm and 20-30mm according to a proportion of 20;
the emulsified asphalt is cationic middle-cracked emulsified asphalt and is prepared by mixing asphalt, water, a composite emulsifier and a stabilizer; wherein, the asphalt accounts for more than 60 percent of the total mass of the emulsified asphalt; the composite emulsifier is two or more of alkylphenol polyoxyethylene ether sulfonated succinate, polyoxyethylene sorbitan stearic acid, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene; the stabilizer is polyvinyl alcohol;
the component D is superplasticizer;
the component E is a surfactant aqueous solution;
the weight portion ratio of each component is as follows: 13-20 parts of component A, 60-80 parts of component B, 25-35 parts of component C, 1.28-1.98 parts of component D and 5-8 parts of component E.
2. The recycled cement concrete for recycling waste asphalt according to claim 1, wherein the component B comprises the following components in parts by weight: 32.5-52.5 parts of coarse aggregate and 27.5 parts of fine aggregate;
the nominal maximum grain size of the coarse aggregate is not more than 30mm, and the nominal maximum grain size of the fine aggregate is not more than 5mm.
3. The recycled cement concrete of waste asphalt recycling according to claim 2, characterized in that the coarse aggregate is composed of limestone with particle size of 20-30mm, 10-20mm, 5-10mm according to the proportion of 45; the fine aggregate is natural sand, and the sand rate is 31-35%; and when the component B is stirred and mixed, mixing the components according to the particle size proportion to obtain coarse aggregates and fine aggregates, and distributing the coarse aggregates and the fine aggregates according to the part ratio.
4. The recycled cement concrete for recycling waste asphalt according to claim 1, which is characterized in that the component E comprises the following components in parts by weight: 0.25-0.4 part of surfactant and 4.75-7.6 parts of water.
5. A method for preparing recycled cement concrete by recycling waste asphalt, which is characterized by preparing recycled cement concrete by recycling waste asphalt according to any one of claims 1 to 4, comprising the following steps:
s1, preparing a component A: cutting the waste carbon fiber into required length, and mixing with cement in proportion;
s2, preparing a component C: drying the quick regenerant, uniformly spraying the quick regenerant on the surface of the waste asphalt mixture, pouring the quick regenerant into emulsified asphalt diluted with water in advance after the waste asphalt on the surface of the quick regenerant is dissolved, and uniformly stirring the quick regenerant and the emulsified asphalt together for 1-2min;
s3, preparing a component E: dissolving a surfactant in water in advance, and uniformly stirring for later use;
s4, mixing: dry-mixing the coarse and fine aggregates in the component B, premixing uniformly, adding half of the component E, stirring for 30s, adding the mixed component A, dissolving the component D in the other half of the component E, slowly adding the mixture into a stirrer, stirring for 2-3 minutes until the surface of concrete has obvious gloss, and preparing a base material;
s5, adding the component C into the base material, stirring for 1-2min until the mixture is uniform, obtaining the newly-mixed recycled cement concrete F, and measuring the performance index of the newly-mixed recycled cement concrete F.
6. The application of the recycled cement concrete of the recycled waste asphalt is characterized in that the recycled cement concrete of the recycled waste asphalt according to any one of claims 1 to 4 is applied to curb and side slope protection block engineering components.
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