CN115259747A - Composite modified polyurethane concrete and preparation method thereof - Google Patents
Composite modified polyurethane concrete and preparation method thereof Download PDFInfo
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- CN115259747A CN115259747A CN202210742711.0A CN202210742711A CN115259747A CN 115259747 A CN115259747 A CN 115259747A CN 202210742711 A CN202210742711 A CN 202210742711A CN 115259747 A CN115259747 A CN 115259747A
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- composite modified
- graphene oxide
- polyurethane
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- modified polyurethane
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/16—Polyurethanes
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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
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a composite modified polyurethane concrete and a preparation method thereof, aiming at solving the technical problem that the high-temperature stability, low-temperature crack resistance and fatigue resistance of the polyurethane concrete are difficult to meet the requirements. The material is mainly prepared from raw materials such as mineral aggregate, polyurethane, graphene oxide, rubber powder, an improver, a stabilizer, a coupling agent and the like; the graphene oxide/rubber powder composite modified polyurethane concrete is adopted, so that the high-temperature stability, the low-temperature crack resistance and the fatigue resistance are improved; based on the synergistic effect of the polyurethane, the graphene oxide and the rubber powder, the polyurethane accelerates the curing reaction with the mixture under the high-temperature condition, has better binding force with the aggregate, and simultaneously strengthens the wrapping force on the aggregate, and the mixture has very good load deformation resistance due to the addition of the graphene oxide and the rubber powder; the viscoelastic property is excellent at low temperature, and the anti-cracking property of the mixture is better due to the addition of the graphene oxide and the rubber powder.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to composite modified polyurethane concrete and a preparation method thereof.
Background
Asphalt is widely used as cementing material for road pavement. The asphalt pavement belongs to a flexible pavement and has the advantages of low noise, high construction speed, easy repair, good pavement performance and the like. The asphalt has certain viscosity and elasticity due to the material performance, and is particularly easily influenced by environmental factors in the using process; under the influence of traffic load and natural environment which increase year by year, the asphalt pavement is particularly easy to generate micro cracks due to sudden temperature drop in winter, and the problems of rutting, pushing, pavement bulging and the like occur under the action of vehicle load in summer, so that the actual service performance of the asphalt pavement is influenced.
The polyurethane concrete is prepared by mixing common concrete and polyurethane which is a high-molecular polymer material, so that the performance of the polymer concrete is remarkably improved compared with that of the common concrete. However, in the process of implementing the technical solution in the embodiment of the present application, the inventor of the present application finds that the above technology has at least the following technical problems: the pavement performance of polyurethane concrete is still poor, and the high-temperature stability, low-temperature crack resistance and fatigue resistance of the polyurethane concrete are still to be improved.
The information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
In view of at least one of the above technical problems, the present disclosure provides a composite modified polyurethane concrete and a preparation method thereof, aiming to improve the high temperature stability, low temperature crack resistance and fatigue resistance of the polyurethane concrete.
According to one aspect of the disclosure, a composite modified polyurethane concrete is provided, which is prepared from the following raw materials in parts by weight: 100 portions of mineral aggregate, 4 to 8 portions of polyurethane, 0.002 to 0.008 portion of graphene oxide, 0.3 to 1.8 portions of rubber powder, 0.014 to 0.036 portion of improver, 0.10 to 0.30 portion of stabilizer and 0.002 to 0.012 portion of coupling agent.
In some embodiments of the present disclosure, the composite modified polyurethane concrete is prepared from the following raw materials in parts by weight: 100 portions of mineral aggregate, 4 to 6 portions of polyurethane, 0.004 to 0.006 portion of graphene oxide, 0.7 to 1.3 portions of rubber powder, 0.018 to 0.032 portion of improver, 0.15 to 0.25 portion of stabilizer and 0.004 to 0.008 portion of coupling agent.
In some embodiments of the present disclosure, the composite modified polyurethane concrete is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 5.8 parts of polyurethane, 0.005 part of graphene oxide, 1.2 parts of rubber powder, 0.021 part of improver, 0.18 part of stabilizer and 0.007 part of coupling agent.
In some embodiments of the present disclosure, the improving agent is NT CAT FG1021 (also known as polyurethane monosodium glutamate, non-silicone oil, pinhole remover, etc.), and its main function is to improve the bonding strength with other composite materials (such as graphene oxide, rubber powder, etc.).
In some embodiments of the present disclosure, the stabilizer is tricresyl phosphate, which primarily functions to improve compatibility with the polyurethane.
In some embodiments of the disclosure, the coupling agent is 3-glycidoxypropyltrimethoxysilane, which primarily serves to increase adhesion to the surface of the mineral aggregate and to increase strength.
In some embodiments of the present disclosure, the polyurethane is CR341A two-component polyurethane cement.
According to another aspect of the disclosure, a preparation method of the composite modified polyurethane concrete is provided, which comprises the following steps:
(1) Preparing a modifier: preparing the raw materials according to the weight ratio in claim 1;
uniformly mixing graphene oxide, an improver and a coupling agent according to the proportion of 1.1;
the rubber powder, the modifier and the coupling agent are uniformly mixed according to the proportion of 1.018. (ii) a
(2) Preparing composite modified polyurethane: adding a stabilizer, the graphene oxide modifier obtained in the step (1) and a rubber powder modifier into polyurethane under the stirring condition of 20-30 ℃, and uniformly stirring; shearing the polyurethane by a high-speed shearing machine to obtain composite modified polyurethane;
(3) Preparing composite modified polyurethane concrete: and (3) placing the mineral aggregate at the temperature of 20-30 ℃ and mixing and stirring the mineral aggregate and the composite modified polyurethane obtained in the step (2) uniformly to obtain the polyurethane-modified polyurethane composite material.
In some embodiments of the present disclosure, in the step (1),
when the graphene oxide modifier is prepared, firstly diluting a coupling agent with ethanol, then adding graphene oxide and an improver into the diluent of the coupling agent, stirring for 0.5-1 h at the temperature of 20-30 ℃, and then placing in a drying oven to dry and remove ethanol to obtain the graphene oxide modifier;
when the rubber powder modifier is prepared, firstly, the coupling agent is diluted by ethanol, then the rubber powder and the modifier are added into the diluent of the coupling agent, the mixture is heated and stirred for 0.5 to 1 hour at the temperature of between 20 and 30 ℃, and then the mixture is placed in a drying oven to be dried and remove the ethanol, thus obtaining the rubber powder modifier.
In some embodiments of the present disclosure, in the step (2), the material is firstly sheared at a low speed of 1000-2000 rpm for 10-15 min, and then sheared at a high speed of 4000-5000 rpm for 20-30 min.
One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:
1. the graphene oxide/rubber powder composite modified polyurethane concrete has better high-temperature stability, low-temperature crack resistance, fatigue resistance and the like than common polyurethane concrete; the raw materials of the polyurethane, the graphene oxide and the rubber powder are nontoxic and harmless, and the production process of the mixture is pollution-free; the preparation method is simple in preparation process and convenient to operate.
2. 3-glycidyl propyl trimethoxy silane is added to enable graphene oxide, rubber powder, non-silicon silicone oil, tricresyl phosphate and polyurethane to be connected inside the mixture to form a net-shaped connecting structure through the coupling effect of a silane coupling agent during mixing, so that the impact resistance and the stability of the mixture are enhanced; meanwhile, the 3-glycidyl propyl trimethoxy silane can improve the fatigue performance of the mixture; the high-temperature performance and the low-temperature performance of the mixture can be obviously improved by the matching effect of the graphene oxide and the rubber powder.
3. Based on the synergistic effect of the polyurethane, the graphene oxide and the rubber powder, the polyurethane accelerates the curing reaction with the mixture under the high-temperature condition, has better binding force with the aggregate, and simultaneously strengthens the wrapping force on the aggregate, and the mixture has very good capacity of resisting load deformation due to the addition of the graphene oxide and the rubber powder; the viscoelastic property is excellent at low temperature, and the anti-cracking property of the mixture is better due to the addition of the graphene oxide and the rubber powder.
Detailed Description
The instruments and devices referred to in the following examples are conventional instruments and devices unless otherwise specified; the raw materials and reagents are all conventional raw materials which are sold in the market unless otherwise specified; the related detection, test, preparation methods and the like are all conventional methods unless particularly stated.
In order to better understand the technical solution of the present application, the following detailed description will be given of the technical solution in conjunction with specific embodiments.
Example 1
The example discloses a graphene oxide/rubber powder composite modified polyurethane concrete which is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 5.0 parts of polyurethane, 0.002 part of graphene oxide, 0.3 part of rubber powder, 0.014 part of improver (NT CAT FG 1021), 0.10 part of stabilizer (tricresyl phosphate) and 0.002 part of coupling agent (3-glycidoxypropyltrimethoxysilane); the mineral aggregate used in this example was an AC-13 type mineral aggregate and the coupling agent was KH-560 epoxy functional silane.
Example 2
The embodiment discloses graphene oxide/rubber powder composite modified polyurethane concrete which is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 5.5 parts of polyurethane, 0.004 part of graphene oxide, 0.9 part of rubber powder, 0.018 part of improving agent (NT CAT FG 1021), 0.15 part of stabilizing agent (tricresyl phosphate) and 0.005 part of coupling agent (3-glycidylpropyltrimethoxysilane); the mineral aggregate used in this example was an AC-13 type mineral aggregate and the coupling agent was KH-560 epoxy functional silane.
Example 3
The embodiment discloses graphene oxide/rubber powder composite modified polyurethane concrete which is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 5.8 parts of polyurethane, 0.005 part of graphene oxide, 1.2 parts of rubber powder, 0.021 part of improver (NT CAT FG 1021), 0.18 part of stabilizer (tricresyl phosphate) and 0.007 part of coupling agent (3-glycidylpropyltrimethoxysilane); the mineral aggregate used in this example was an AC-13 type mineral aggregate and the coupling agent was KH-560 epoxy functional silane.
Example 4
The embodiment discloses graphene oxide/rubber powder composite modified polyurethane concrete which is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 6.5 parts of polyurethane, 0.007 part of graphene oxide, 1.5 parts of rubber powder, 0.030 part of improver (NT CAT FG 1021), 0.25 part of stabilizer (tricresyl phosphate) and 0.010 part of coupling agent (3-glycidylpropyltrimethoxysilane); the mineral aggregate used in this example was an AC-13 type mineral aggregate and the coupling agent was KH-560 epoxy functional silane.
Example 5
The embodiment discloses graphene oxide/rubber powder composite modified polyurethane concrete which is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 7.0 parts of polyurethane, 0.008 part of graphene oxide, 1.7 parts of rubber powder, 0.036 part of improver (NT CAT FG 1021), 0.30 part of stabilizer (tricresyl phosphate) and 0.012 part of coupling agent (3-glycidoxypropyltrimethoxysilane); the mineral aggregate used in this example was an AC-13 type mineral aggregate and the coupling agent was KH-560 epoxy functional silane.
The preparation method of the graphene oxide/rubber powder composite modified polyurethane concrete in the embodiment comprises the following steps:
the raw materials were selected in the weight parts described in examples 1-5, respectively.
(1) Preparing a modifier:
preparing graphene oxide, an improver and a coupling agent according to the proportion of 1; diluting a coupling agent with ethanol, adding graphene oxide and an improver into the diluent of the coupling agent, stirring for 1h at 25 ℃, and finally drying in a drying oven to remove ethanol to obtain the prepared graphene oxide modifier. The graphene oxide modifier has a high specific surface area and functional groups with rich surfaces, can provide a large specific surface area to effectively disperse an attached material, prevents agglomeration, and enhances the binding force.
Uniformly mixing rubber powder, an improver and a coupling agent according to the proportion of 1.018; diluting the coupling agent with ethanol, adding the rubber powder and the modifier into the diluent of the coupling agent, stirring for 1h at 25 ℃, and finally drying in a drying oven to remove the ethanol, thereby obtaining the prepared rubber powder modifier.
(2) Preparing graphene oxide/rubber powder composite modified polyurethane: stirring polyurethane at the temperature of 25 ℃, adding a stabilizer, the graphene oxide modifier obtained in the step (1) and a rubber powder modifier into the stirred polyurethane, uniformly stirring, and shearing the heated basic asphalt by using a high-speed shearing machine to obtain graphene oxide/rubber powder composite modified polyurethane; the shearing treatment process comprises the following steps: firstly shearing at low speed for 10-15 min under the condition that the shearing rate is 1000-2000 rpm, and then shearing at high speed for 20-30 min under the condition that the shearing rate is 4000-5000 rpm.
(3) Preparing graphene oxide/rubber powder composite modified polyurethane concrete: and (3) putting the mineral aggregate into a drying oven at 20-30 ℃ to mix and stir the graphene oxide/rubber powder composite modified polyurethane obtained in the step (2) uniformly according to a conventional method, so as to obtain the graphene oxide/rubber powder composite modified polyurethane concrete.
The graphene oxide/rubber powder composite modified polyurethane concrete in the embodiments 1 to 5 was subjected to pavement performance test and detection, the test items include a rutting test, a low-temperature trabecular bending test and a four-point bending fatigue test, the test items are used for testing the pavement performance of the graphene oxide/rubber powder composite modified polyurethane concrete, and the test results are compared and analyzed with the ordinary polyurethane concrete without adding graphene oxide and rubber powder, and the test results are shown in table 1 below.
Table 1 shows the road performance test data of the graphene oxide/rubber powder composite modified polyurethane concrete in each example
At present, no test method for the performance of a polyurethane concrete road by a unified standard exists at home and abroad, and the research of the invention obtains the road performance research of the polyurethane concrete by a related test method of an asphalt mixture in JTG E20-2011 road engineering asphalt and asphalt mixture test regulations according to the experimental groping of the polyurethane concrete at the early stage. As can be seen from Table 1, the graphene oxide/rubber powder composite modified polyurethane concrete provided by the invention far meets the standard requirements, and the high-temperature performance, the low-temperature performance and the fatigue resistance of the graphene oxide/rubber powder composite modified polyurethane concrete are obviously higher than those of common polyurethane concrete, which indicates that the pavement performance of the graphene oxide/rubber powder composite modified polyurethane concrete is greatly improved on the basis of common polyurethane concrete.
While certain preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present application and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The composite modified polyurethane concrete is characterized by being prepared from the following raw materials in parts by weight: 100 portions of mineral aggregate, 4 to 8 portions of polyurethane, 0.002 to 0.008 portion of graphene oxide, 0.3 to 1.8 portions of rubber powder, 0.014 to 0.036 portion of improver, 0.10 to 0.30 portion of stabilizer and 0.002 to 0.012 portion of coupling agent.
2. The composite modified polyurethane concrete of claim 1, which is characterized by being prepared from the following raw materials in parts by weight: 100 portions of mineral aggregate, 4 to 6 portions of polyurethane, 0.004 to 0.006 portion of graphene oxide, 0.7 to 1.3 portions of rubber powder, 0.018 to 0.032 portion of improver, 0.15 to 0.25 portion of stabilizer and 0.004 to 0.008 portion of coupling agent.
3. The composite modified polyurethane concrete of claim 1, which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 5.8 parts of polyurethane, 0.005 part of graphene oxide, 1.2 parts of rubber powder, 0.021 part of improver, 0.18 part of stabilizer and 0.007 part of coupling agent.
4. The composite modified polyurethane concrete according to claim 1, 2 or 3, wherein the improver is NT CAT FG1021.
5. The composite modified polyurethane concrete according to claim 1, 2 or 3, wherein the stabilizer is tricresyl phosphate.
6. The composite modified polyurethane concrete according to claim 1, 2 or 3, wherein the coupling agent is 3-glycidylpropyltrimethoxysilane.
7. The composite modified polyurethane concrete according to claim 1, 2 or 3, wherein the polyurethane is CR341A two-component polyurethane binder.
8. The preparation method of the composite modified polyurethane concrete of claim 1, comprising the steps of:
(1) Preparing a modifier: preparing the raw materials according to the weight ratio in claim 1;
uniformly mixing graphene oxide, an improver and a coupling agent according to a ratio of 1;
uniformly mixing rubber powder, an improver and a coupling agent according to a ratio of 1;
(2) Preparing composite modified polyurethane: adding a stabilizer, the graphene oxide modifier obtained in the step (1) and a rubber powder modifier into polyurethane under the stirring condition of 20-30 ℃, and uniformly stirring; shearing the polyurethane by a high-speed shearing machine to obtain composite modified polyurethane;
(3) Preparing composite modified polyurethane concrete: and (3) placing the mineral aggregate at the temperature of 20-30 ℃ and mixing and stirring the mineral aggregate and the composite modified polyurethane obtained in the step (2) uniformly to obtain the polyurethane-modified polyurethane composite material.
9. The preparation method of the composite modified polyurethane concrete according to claim 8, wherein in the step (1), when the graphene oxide modifier is prepared, the coupling agent is diluted with ethanol, the graphene oxide and the modifier are added into the diluent of the coupling agent, the mixture is stirred for 0.5 to 1 hour at the temperature of 20 to 30 ℃, and then the mixture is placed in a drying oven to be dried to remove ethanol, so that the graphene oxide modifier is obtained;
when the rubber powder modifier is prepared, firstly, the coupling agent is diluted by ethanol, then the rubber powder and the modifier are added into the diluent of the coupling agent, the mixture is heated and stirred for 0.5 to 1 hour at the temperature of between 20 and 30 ℃, and then the mixture is placed in a drying oven to be dried and remove the ethanol, thus obtaining the rubber powder modifier.
10. The method for preparing the composite modified polyurethane concrete according to claim 8, wherein in the step (2), the composite modified polyurethane concrete is firstly sheared at a low speed of 1000-2000 rpm for 10-15 min and then at a high speed of 4000-5000 rpm for 20-30 min.
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| CN103834185A (en) * | 2014-02-26 | 2014-06-04 | 西安理工大学 | Polyurethane/nano-composite modified asphalt and preparation method thereof |
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