CN114479490A - Modified emulsified asphalt and preparation method and application thereof - Google Patents
Modified emulsified asphalt and preparation method and application thereof Download PDFInfo
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- CN114479490A CN114479490A CN202111473457.0A CN202111473457A CN114479490A CN 114479490 A CN114479490 A CN 114479490A CN 202111473457 A CN202111473457 A CN 202111473457A CN 114479490 A CN114479490 A CN 114479490A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
- C08L7/02—Latex
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J107/00—Adhesives based on natural rubber
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J195/00—Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides modified emulsified asphalt and a preparation method and application thereof, wherein the modified emulsified asphalt comprises emulsified asphalt, a modifier and a stabilizer, the modifier consists of natural latex, petroleum resin emulsion and a third modified liquid, and the third modified liquid is at least one of neoprene latex, butyronitrile latex and terpene resin emulsion. The invention can better take account of the bonding strength and the low-temperature performance of the emulsified asphalt by selecting the natural latex, the petroleum resin emulsion and the third modified liquid for compounding without other complicated modification steps. Meanwhile, the modified emulsified asphalt can accelerate demulsification speed, has the characteristic of non-stick wheels, allows paving equipment to construct on a sticky layer material, does not influence the quality of the sticky layer due to adhesion of asphalt on tires in the construction process to cause performance loss, forms a sticky layer surface with good bonding strength, improves construction efficiency, and reduces diseases such as pavement delamination, fatigue cracking and the like caused by bonding failure.
Description
Technical Field
The invention relates to the technical field of road materials, in particular to modified emulsified asphalt and a preparation method and application thereof.
Background
The thin overlay is a technology of ultrathin asphalt concrete wearing layer, mainly used for preventive maintenance of high-grade asphalt or cement pavement and corrective maintenance of slight diseases. Typically, highway pavements have a useful life of at least 6 years, but good thin-layer finishes are effective in extending the useful life of highways, typically to 8-10 years or more. Meanwhile, the rough surface of the wearing layer can improve the skid resistance of the wheel, effectively reduce noise, have better water permeability, greatly reduce common water mist in rainy days and improve visibility.
Because the thin-layer overlay often does not have very large thickness (generally less than 2cm), and increasingly serious adverse conditions such as high temperature, heavy load, overload and the like, the new thin-layer overlay asphalt pavement often has track, crack, interlaminar transition, embrace and other diseases soon after being put into use, and is easy to generate interlaminar slippage damage, especially on special road sections such as steep slopes and bends, and especially when the thin-layer overlay is used in bridge deck pavement structures and tunnel composite pavements, because the elastic modulus difference between asphalt mixtures and cement concrete is very different, the deformation coordination is not good, and if the interlaminar adhesion treatment is not carried out or the adhesion treatment is not proper, the interlaminar detachment is caused by the incapability of bearing strong shear stress in the horizontal direction, and the problem of interlaminar slippage is particularly prominent. Therefore, thin layer mat coatings place high demands on the adhesive material.
In the asphalt pavement construction specification, general regulations are made on the binding materials used for a bonding layer, a permeable layer and a lower sealing layer, but no specific regulations are made on the aspects of selection of emulsified asphalt used for interlayer treatment, selection of optimal material dosage and the like. During construction of a specific project, common emulsified asphalt or SBS modified emulsified asphalt is often used for a common adhesive layer, and is easy to damage caused by rolling of construction vehicles in the construction process, so that inter-layer adhesion is easy to fail to reach the standard. The poor interlayer bonding state can seriously affect the use performance of various paving structures, the interlayer treatment effect is poor during construction, sufficient shear strength and bonding strength cannot be provided, the interlayer shear damage is caused, and then various diseases appear in the later stage of the asphalt pavement. If the bonding strength is improved, the low-temperature performance is easy to reduce, namely, the ductility is poor in a low-temperature environment, and the construction is difficult. Meanwhile, the conventional emulsified asphalt has long demulsification time, and after spreading, a construction unit usually needs to wait for several hours to allow a spreading vehicle to enter a field to spread the mixture, so that the construction efficiency is reduced. That is, the prior art is difficult to achieve the balance of the bonding performance, the low-temperature performance and the construction efficiency.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides modified emulsified asphalt and a preparation method and application thereof.
The invention provides modified emulsified asphalt, which comprises emulsified asphalt, a modifier and a stabilizer, wherein the modifier consists of natural latex, petroleum resin emulsion and third modified liquid, and the third modified liquid is at least one of neoprene latex, nitrile latex and terpene resin emulsion.
According to the invention, through research, the natural latex, the petroleum resin emulsion and the third modified liquid are selected and compounded, so that the bonding strength and the low-temperature performance of the emulsified asphalt can be better considered, other complicated modification steps are not needed, and the emulsion breaking speed can be accelerated by simply adjusting the dosage ratio of the emulsified asphalt to other components on the basis, so that the modified emulsified asphalt with high bonding strength, good low-temperature performance and high construction efficiency is obtained, and is suitable for thin-layer cover surfaces.
Further, the mass ratio of the natural rubber latex to the petroleum resin emulsion to the third modifying liquid is (30-80): (5-10): (1-10).
Further, the mass ratio of the emulsified asphalt to the modifier is 40:60-60: 40.
Further, the dosage of the stabilizer is 0.5-1.2% of the modified emulsified asphalt. The stabilizer is preferably sodium vinyl sulfonate emulsion.
Further, the third modification liquid is prepared from (0.5-1) to (0.5-2) by mass: (1.5-3) polychloroprene latex, nitrile latex and terpene resin emulsion.
In a preferred embodiment of the present invention, the modified emulsified asphalt comprises the following components in parts by weight: 40-55 parts of emulsified asphalt, 30-50 parts of natural latex, 0.5-2.5 parts of neoprene latex, 0.5-1 part of butyronitrile latex, 5-10 parts of petroleum resin emulsion, 1.5-3 parts of terpene resin emulsion and 0.5-1 part of sodium vinyl sulfonate emulsion.
Further, the emulsified asphalt is cationic emulsified asphalt. Specifically, the slow-breaking and quick-setting type cationic asphalt emulsion is obtained by taking matrix asphalt, an emulsifier and a stabilizer (wherein the stabilizer is different from the stabilizer in the formula of the modified emulsified asphalt and can be methyl cellulose) as raw materials through an emulsification process.
Further, the natural latex is a viscous milky white liquid, wherein the solid content of the effective component is 55-65% (the solid content of the effective component refers to the percentage of the latex content in the emulsion to the total amount of the latex and water, the latex is a natural high molecular compound taking cis-1, 4-polyisoprene as a main component, and the content of rubber hydrocarbon in the components is 91-94%). In order to prevent natural coagulation, a certain amount of ammonia solution is required to be added as a protective agent in the natural latex. The commercially available natural rubber latex is added with ammonia solution. The natural rubber latex used in the examples of the present invention had an aqueous ammonia solution content of about 0.77%.
Further, the content of the cationic chloroprene rubber in the chloroprene latex is more than 50%.
Further, the content of the nitrile rubber in the nitrile rubber latex is more than 50%.
Further, the solid content of the petroleum resin emulsion is more than 60%.
Further, the terpene resin emulsion is milky phenolic modified terpene resin, wherein the solid content is more than 60%.
The invention also provides a preparation method of the modified emulsified asphalt. The preparation method provided by the invention comprises the step of mixing the raw material components.
Preferably, the mixing is carried out by mixing the emulsified asphalt with the natural rubber latex, adding the petroleum resin emulsion and the polychloroprene latex, the nitrile latex (when both components are contained), then adding the stabilizer, and finally adding the terpene resin emulsion (when the components are contained).
The equipment used in the mixing may be emulsifying equipment, which may typically be a colloid mill, a homogenizer, a stirrer, or the like.
In a specific embodiment of the present invention, the preparation method comprises the steps of:
stirring and mixing the emulsified asphalt and the natural latex at normal temperature, and stirring for 30-60min at the rotation speed of 500-1000rpm by using a stirrer, wherein the stirring temperature is 45-90 ℃;
adding neoprene latex and/or nitrile latex and/or petroleum resin emulsion into the mixed solution, and stirring for 30-60min at the rotating speed of 500-1000rpm by using a stirrer;
adding a stabilizer, then adding the terpene resin emulsion, and stirring for 30-60min at the rotation speed of 500-.
The invention also provides application of the modified emulsified asphalt in a thin-layer cover. Specifically, the modified emulsified asphalt is used as a bonding layer of a thin-layer cover and is applied in a spreading mode.
The invention provides modified emulsified asphalt and a preparation method and application thereof, wherein the bonding strength and the low-temperature performance of the emulsified asphalt can be better considered by selecting and compounding natural latex, petroleum resin emulsion and a third modified solution without other complicated modification steps. Meanwhile, the modified emulsified asphalt can accelerate demulsification speed, has the characteristic of non-stick wheels, allows paving equipment to construct on a sticky layer material, does not influence the quality of the sticky layer due to adhesion of asphalt on tires in the construction process to cause performance loss, forms a sticky layer surface with good bonding strength, improves construction efficiency, reduces diseases such as pavement delamination, fatigue cracking and the like caused by bonding failure, and simultaneously can keep the surrounding roads of a construction site clean.
The modified emulsified asphalt can be applied to thin-layer cover surfaces, avoids using special integrated construction equipment, breaks through cost limitation, promotes large-scale popularization and application of the technology, has very wide market prospect, can effectively solve the problem of wheel sticking of construction vehicles, improves the use efficiency, has important significance for perfecting a thin-layer maintenance technology system and the application prospect of the sticky-layer emulsified asphalt, has certain significance for reducing various diseases and enhancing the usability of pavements, reduces the generation and development of pavement interlayer slippage and reflection cracks, greatly reduces the occurrence of water damage phenomena such as scouring, panicled mud and pavement pot holes, improves the service quality and service life of asphalt pavements, and saves maintenance cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The raw materials and auxiliary materials used in the following examples are all commercially available unless otherwise specified. Wherein the indexes of the raw materials are as follows:
the emulsified asphalt is cation emulsified asphalt.
The natural latex is a viscous milky white liquid, wherein the content of the latex accounts for 55-65% of the total amount of the latex and water, and the content of the ammonia water solution accounts for 0.77% of the natural latex.
The content of the cation chloroprene rubber in the chloroprene latex is more than 50 percent.
The content of the butyronitrile rubber in the butyronitrile latex is more than 50 percent.
The solid content of the petroleum resin emulsion is more than 60 percent.
The terpene resin emulsion is milky phenolic modified terpene resin, wherein the solid content is more than 60 percent.
Example 1
This example provides a modified emulsified asphalt, which comprises, by weight, 45 parts of emulsified asphalt, 45 parts of natural latex, 2 parts of neoprene latex, 1 part of nitrile latex, 5 parts of petroleum resin emulsion, 1.5 parts of terpene resin emulsion, and 0.5 part of sodium vinylsulfonate emulsion.
The embodiment also provides a preparation method of the modified emulsified asphalt, which comprises the following specific steps:
stirring and mixing the emulsified asphalt and the natural latex at normal temperature, and stirring for 30min at the rotating speed of 1000rpm by using a stirrer, wherein the stirring temperature is 45 ℃;
adding neoprene latex, nitrile latex and petroleum resin emulsion into the mixed solution, and stirring for 30min at the rotating speed of 1000rpm by using a stirrer;
adding sodium vinyl sulfonate emulsion, then adding terpene resin emulsion, and stirring for 30min at 1000rpm by a stirrer.
Example 2
This example provides a modified emulsified asphalt, which comprises, by weight, 40 parts of emulsified asphalt, 50 parts of natural latex, 0.5 part of neoprene latex, 0.5 part of nitrile latex, 6 parts of petroleum resin emulsion, 2 parts of terpene resin emulsion, and 1 part of sodium vinylsulfonate emulsion.
The preparation method is the same as example 1.
Example 3
This example provides a modified emulsified asphalt, which comprises, by weight, 55 parts of emulsified asphalt, 30 parts of natural latex, 1 part of neoprene latex, 1 part of nitrile latex, 9 parts of petroleum resin emulsion, 3 parts of terpene resin emulsion, and 1 part of sodium vinyl sulfonate emulsion.
The preparation method is the same as that of example 1.
Comparative example 1
This comparative example provides a common commercially available emulsified asphalt, i.e., an emulsified asphalt before modification.
Comparative example 2
The comparative example provides a modified emulsified asphalt obtained by mixing 50 parts of emulsified asphalt and 50 parts of natural latex.
Comparative example 3
The comparative example provides a modified emulsified asphalt, which comprises 55 parts by weight of emulsified asphalt, 30 parts by weight of natural latex, 14 parts by weight of petroleum resin emulsion and 1 part by weight of sodium vinyl sulfonate emulsion.
The preparation method is the same as that of example 1.
Comparative example 4
The comparative example provides a modified emulsified asphalt, which comprises 55 parts by weight of emulsified asphalt, 30 parts by weight of natural latex, 3 parts by weight of neoprene latex, 3 parts by weight of nitrile latex, 8 parts by weight of terpene resin emulsion and 1 part by weight of sodium vinylsulfonate emulsion.
The preparation method is the same as example 1.
Performance testing
The performance index results of the modified emulsified asphalt provided in each example and comparative example are shown in table 1 according to the asphalt cement detection method specified in the road engineering asphalt and asphalt mixture test procedures of the industry standard. The strength of the modified emulsified asphalt was evaluated by a tensile strength test. And evaluating the workability of the modified emulsified asphalt by adopting the mixing time and the mixing state.
TABLE 1 modified emulsified asphalt Performance index
From the above results, it can be seen that the modified emulsified asphalt provided by the embodiment of the present invention has a softening point of the evaporation residue of the modified emulsified asphalt as high as 75 ℃ or above, a low temperature ductility of the evaporation residue of the emulsified asphalt at 15 ℃ of greater than 30cm, an elastic recovery at 25 ℃ of greater than 65%, and an adhesive force and a pull strength at 25 ℃ of greater than 1.4MPa when applied to a pavement adhesive layer, and is a modified emulsified asphalt with high adhesive strength, high demulsification speed, good low temperature performance, and excellent storage stability, and can be used as an adhesive material for a thin overlay in a newly built or maintained pavement.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The modified emulsified asphalt is characterized by comprising emulsified asphalt, a modifier and a stabilizer, wherein the modifier consists of natural latex, petroleum resin emulsion and third modified liquid, and the third modified liquid is at least one of neoprene latex, nitrile latex and terpene resin emulsion.
2. The modified emulsified asphalt as defined in claim 1, wherein the mass ratio of the natural rubber latex, the petroleum resin emulsion and the third modified liquid is (30-80): (5-10): (1-10).
3. The modified emulsified asphalt as claimed in claim 2, wherein the mass ratio of the emulsified asphalt to the modifier is 40:60-60: 40.
4. The modified emulsified asphalt as claimed in any one of claims 1 to 3, wherein the third modified fluid is a mixture of (0.5-1): 0.5-2): (1.5-3) polychloroprene latex, nitrile latex and terpene resin emulsion.
5. The modified emulsified asphalt as claimed in claim 4, wherein the modified emulsified asphalt comprises the following components in parts by weight: 40-55 parts of emulsified asphalt, 30-50 parts of natural latex, 0.5-2.5 parts of neoprene latex, 0.5-1 part of butyronitrile latex, 5-10 parts of petroleum resin emulsion, 1.5-3 parts of terpene resin emulsion and 0.5-1 part of sodium vinyl sulfonate emulsion.
6. The modified emulsified asphalt as claimed in any one of claims 1 to 3, wherein the emulsified asphalt is a cationic emulsified asphalt.
7. The modified emulsified asphalt as claimed in any one of claims 1 to 3, wherein the natural rubber latex has a solid content of 55 to 65%;
the solid content of the petroleum resin emulsion is more than 60 percent.
8. The modified emulsified asphalt as claimed in any one of claims 1 to 3, wherein the cationic chloroprene rubber content in the chloroprene latex is more than 50%;
the content of the butyronitrile rubber in the butyronitrile latex is more than 50 percent;
the terpene resin emulsion is phenolic aldehyde modified terpene resin, wherein the solid content is more than 60 percent.
9. The process for producing modified emulsified asphalt as claimed in any one of claims 1 to 8, which comprises the step of mixing the respective raw material components.
10. Use of the modified emulsified asphalt of any one of claims 1 to 8 in a thin layer overlay.
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