CN114479499B - Anti-aging modified emulsified asphalt and preparation method and application thereof - Google Patents
Anti-aging modified emulsified asphalt and preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of highway building materials, and discloses an anti-aging modified emulsified asphalt and a preparation method and application thereof. The preparation method comprises the following steps: mixing TB rubber powder modified asphalt, a thermoplastic elastomer, nano aluminum oxide and waste edible oil, heating to 165-185 ℃ and uniformly stirring and mixing to obtain composite modified asphalt; adding an asphalt emulsifier into water to prepare soap solution, and regulating the pH value of the soap solution to be 2-3 and the temperature to be 65-80 ℃; and uniformly mixing the composite modified asphalt and the soap solution, and grinding and emulsifying to obtain the anti-aging modified emulsified asphalt. The anti-aging modified emulsified asphalt provided by the invention has significantly improved construction workability and anti-aging performance. Has extremely high industrial utilization value.
Description
Technical Field
The invention belongs to the technical field of highway building materials, and particularly relates to an anti-aging modified emulsified asphalt as well as a preparation method and application thereof.
Background
At present, road engineering construction of all countries in the world is already or is entering a bottleneck period, and simultaneously, the huge new engineering construction demand is changed into the huge pavement maintenance demand. The ultra-thin asphalt mat coat technology is a novel preventive maintenance technology, is suitable for the preventive maintenance of high-grade pavement with large traffic and high pavement performance requirements, can improve flatness, skid resistance, wear resistance, noise reduction and good durability, is widely applied in various countries in the world, and is characterized by the good and bad interlayer bonding performance of the mat coat layer and the old pavement.
In order to prevent delamination of the ultra-thin asphalt mat, special attention is paid to making an adhesive layer to firmly bond the upper and lower layers, which is one of the keys of success and failure of the ultra-thin asphalt mat. In pavement design, there are generally three types of tie layer materials: emulsified asphalt, diluted asphalt and hot asphalt are used as the adhesive layer material at home and abroad. However, asphalt is volatilized, oxidized and polymerized to change its internal structure under the action of environmental factors such as heat, oxygen and water during storage, transportation and construction and use of its mixture, so that asphalt performance is deteriorated and degradation of asphalt concrete pavement is caused, and the service life and durability of asphalt concrete pavement are directly affected by the aging rate of asphalt.
In summary, under the current large environment, in order to effectively solve the problem of interlayer adhesion of an ultrathin asphalt pavement and reduce early diseases of an asphalt pavement, the emulsified asphalt which is convenient to construct and wide in raw material source and can improve the service performance of the asphalt pavement is developed, and the emulsified asphalt has important significance and is also an urgent need for road construction development in China.
Patent CN 106084816A discloses a non-sticky wheel emulsified asphalt for a sticky layer, which is prepared by the following method: 1) Adding 0-9 parts of high polymer elastomer material, 0-5 parts of polyethylene wax or ethylene-vinyl acetate wax, 0-5 parts of viscosity reducer and 0-5 parts of modified asphalt stabilizer into 450-600 parts of asphalt to prepare modified asphalt; 2) Adding 1-10 parts of emulsifying agent and 0.1-3 parts of emulsified asphalt stabilizer into 300-500 parts of water, and mixing to obtain soap solution; 3) Grinding and emulsifying the soap solution and the modified asphalt according to the mass ratio of 1:1 by a modified asphalt colloid mill, wherein the temperature of the soap solution is 40-60 ℃, and the emulsification temperature of the modified asphalt is 160-180 ℃ to prepare the target product.
Patent CN 112375234A discloses a preparation method of high-strength composite modified emulsified asphalt, which comprises the following steps: s1, asphalt heating treatment: heating and stirring SBS modified asphalt to 170-185 ℃; s2, preparing high-strength SBS modified asphalt: adding tackifying modified resin accounting for 3-5% of the mass of the SBS modified asphalt and 1-2% of high-strength synergist into the heated and stirred SBS modified asphalt, and shearing and stirring for 1-2 h at a shearing speed of 600-800 r/min to obtain high-strength SBS modified asphalt; s3, preparing high-strength composite modified asphalt: adding rubber oil accounting for 1-3% of the mass of the high-strength SBS modified asphalt into the high-strength SBS modified asphalt obtained in the step S2, adding a warm mix regenerant accounting for 0.3-0.5% of the mass of the high-strength SBS modified asphalt into the high-strength SBS modified asphalt, keeping the temperature at 170-185 ℃, and continuing stirring and developing for 2-4 hours to obtain high-strength composite modified asphalt; s4, preparing an emulsifier aqueous solution: sequentially adding an emulsifying agent and an auxiliary agent into water, and uniformly stirring to obtain an emulsifying agent aqueous solution; s5, preparing high-strength composite modified emulsified asphalt: and mixing the obtained high-strength composite modified asphalt with an emulsifier aqueous solution, adding the mixture into a shearing instrument for shearing and stirring, and finally obtaining the high-strength composite modified emulsified asphalt.
Although the prior art improves the adhesive property to a certain extent, the defects of complex raw material sources or preparation process, higher cost and insufficient ageing resistance are common.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the primary aim of the invention is to provide a preparation method of anti-aging modified emulsified asphalt.
The invention also aims to provide the anti-aging modified emulsified asphalt prepared by the method.
It is still another object of the present invention to provide the use of the above-described anti-aging modified emulsified asphalt in ultra-thin asphalt covers. The anti-aging modified emulsified asphalt disclosed by the invention does not need milling when being applied to an original road surface, can save a great amount of cost and reduce traffic influence, can avoid dust caused by milling on special road sections such as tunnels, bridge decks and the like, ensures traffic safety, effectively improves the anti-skid property of the road surface and obviously reduces traffic noise.
The invention aims at realizing the following technical scheme:
the preparation method of the anti-aging modified emulsified asphalt comprises the following preparation steps:
(1) Preparing a component A: mixing TB rubber powder modified asphalt, a thermoplastic elastomer, nano aluminum oxide and waste edible oil, heating to 165-185 ℃ and uniformly stirring and mixing to obtain composite modified asphalt;
(2) And (3) preparing a component B: adding an asphalt emulsifier into water to prepare soap solution, and regulating the pH value of the soap solution to be 2-3 and the temperature to be 65-80 ℃;
(3) And (3) uniformly mixing the component A prepared in the step (1) and the component B prepared in the step (2), and grinding and emulsifying by an emulsifying device to obtain the anti-aging modified emulsified asphalt.
Further, the TB rubber powder modified asphalt in the step (1) is prepared by mixing waste rubber powder and asphalt with the mass ratio of 1 (3-4) at the temperature of 210-230 ℃.
Compared with matrix asphalt, the TB rubber powder modified asphalt has better advantages in performance and environmental protection. The performance is good, and the high-temperature performance and the low-temperature performance are good, and the storage is stable; in the aspect of environmental protection, waste rubber tires can be utilized, rubber powder reacts in a closed container, and generated waste gas is treated by a combustion method, so that the environment is not polluted.
Further preferably, the rubber hydrocarbon content in the waste rubber powder is 50% -58%.
Further, the thermoplastic elastomer in the step (1) is preferably a star SBS having a tensile strength of 20 to 25 MPa.
The viscoelastic properties of emulsified asphalt can be better improved with respect to linear SBS, star SBS.
Further, the particle size of the nano alumina in the step (1) is 40-70 nm.
The addition of the nano aluminum oxide effectively inhibits the degradation influence of ultraviolet light on butadiene in asphalt, and improves the photo-oxidative aging resistance of the asphalt.
Further, the water content of the waste edible oil in the step (1) is 0.1% -0.2%.
Further, in the step (1), the mass ratio of the TB rubber powder modified asphalt, the thermoplastic elastomer, the nano alumina and the waste edible oil is 85-93:2-4:1-1.5:5-15.
Further, the asphalt emulsifier in the step (2) is a cationic emulsifier; more preferably cetrimide.
Further, the mass ratio of the asphalt emulsifier to the water in the step (2) is 1-3:35-45.
Further, the mass ratio of the A component to the B component in the step (3) is (6.8-7.5): 3.
The anti-aging modified emulsified asphalt is prepared by the method.
The anti-aging modified emulsified asphalt is applied to an ultrathin asphalt cover surface.
Compared with the prior art, the invention has the beneficial effects that:
(1) The anti-aging modified emulsified asphalt is prepared by mixing TB rubber powder modified asphalt, thermoplastic elastomer, nano aluminum oxide, waste edible oil, an emulsifier and water according to a certain process, and the reasonable design of the preparation process ensures that the asphalt finish layer has good interlayer bonding effect, effectively improves the construction workability and the anti-aging performance of the emulsified asphalt, and has high industrial utilization value.
(2) The application of the anti-aging modified emulsified asphalt in the ultra-thin asphalt pavement has the characteristics of high strength of the old pavement, and also has the advantages of excellent anti-skid performance, higher driving comfort, lower driving noise of the asphalt pavement, and greater improvement of the functionality of the pure newly-built cement pavement.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
The anti-aging modified emulsified asphalt for the ultra-thin asphalt cover surface of the embodiment comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 7:3. The component A consists of TB rubber powder modified asphalt (prepared by mixing waste rubber powder (rubber hydrocarbon content is 50%) and asphalt with the mass ratio of 1:3 at the temperature of 210-230 ℃), thermoplastic elastomer (star-shaped SBS with the tensile strength of 20 MPa), nano alumina (particle size of 40-70 nm) and waste edible oil (water content of 0.15%) according to the mass ratio of 90:2:1:7. The component B consists of an asphalt emulsifier (cationic emulsifier) and water according to a mass ratio of 2:36.
The anti-aging modified emulsified asphalt for the ultrathin asphalt cover surface of the embodiment is prepared by the following method:
(1) Preparing a component A: the TB rubber powder modified asphalt, the thermoplastic elastomer, the nano alumina and the waste edible oil are mixed according to the mass ratio and then the composite modified asphalt is prepared at 165 ℃.
(2) And (3) preparing a component B: adding asphalt emulsifier into water, regulating pH value to 2-3, and regulating temperature to 75deg.C to obtain soap solution.
(3) And (3) uniformly mixing the component A prepared in the step (1) and the component B prepared in the step (2), and grinding and emulsifying by an emulsifying device to obtain the anti-aging modified emulsified asphalt for the ultrathin asphalt cover surface.
Example 2
The anti-aging modified emulsified asphalt for the ultra-thin asphalt cover surface of the embodiment comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 7:3. The component A consists of TB rubber powder modified asphalt (prepared by mixing waste rubber powder (the rubber hydrocarbon content is 58%) and asphalt with the mass ratio of 1:4 at the temperature of 210-230 ℃), thermoplastic elastomer (star-shaped SBS with the tensile strength of 25 MPa), nano alumina (the particle size of 40-70 nm) and waste edible oil (the water content of 0.1%) according to the mass ratio of 86:3:1:10. The component B consists of an asphalt emulsifier (cationic emulsifier) and water according to a mass ratio of 2:40.
The anti-aging modified emulsified asphalt for the ultrathin asphalt cover surface of the embodiment is prepared by the following method:
(1) Preparing a component A: the TB rubber powder modified asphalt, the thermoplastic elastomer, the nano alumina and the waste edible oil are mixed according to the mass ratio and then the composite modified asphalt is prepared at 170 ℃.
(2) And (3) preparing a component B: adding asphalt emulsifier into water, regulating pH value to 2-3, and regulating temperature to 70 deg.C to obtain soap solution.
(3) And (3) uniformly mixing the component A prepared in the step (1) and the component B prepared in the step (2), and grinding and emulsifying by an emulsifying device to obtain the anti-aging modified emulsified asphalt for the ultrathin asphalt cover surface.
Example 3
The anti-aging modified emulsified asphalt for the ultra-thin asphalt cover surface of the embodiment comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 7:3. The component A consists of TB rubber powder modified asphalt (prepared by mixing waste rubber powder (the rubber hydrocarbon content is 58%) and asphalt with the mass ratio of 1:4 at the temperature of 210-230 ℃), thermoplastic elastomer (star-shaped SBS with the tensile strength of 25 MPa), nano alumina (the particle size of 40-70 nm) and waste edible oil (the water content of 0.1%) according to the mass ratio of 91.5:2:1.5:5. The component B consists of an asphalt emulsifier (cationic emulsifier) and water according to a mass ratio of 2:42.
The anti-aging modified emulsified asphalt for the ultrathin asphalt cover surface of the embodiment is prepared by the following method:
(1) Preparing a component A: the TB rubber powder modified asphalt, the thermoplastic elastomer, the nano alumina and the waste edible oil are mixed according to the mass ratio and then the composite modified asphalt is prepared at 175 ℃.
(2) And (3) preparing a component B: adding asphalt emulsifier into water, regulating pH value to 2-3, and regulating temperature to 70 deg.C to obtain soap solution.
(3) And (3) uniformly mixing the component A prepared in the step (1) and the component B prepared in the step (2), and grinding and emulsifying by an emulsifying device to obtain the anti-aging modified emulsified asphalt for the ultrathin asphalt cover surface.
Comparative example
The comparative example is an existing emulsified asphalt. The composite material consists of a component A and a component B, wherein the mass ratio of the component A to the component B is 7:3. The component A consists of matrix asphalt and thermoplastic elastomer (linear SBS) according to the mass ratio of 96:4. The component B consists of an asphalt emulsifier (cationic emulsifier) and water according to a mass ratio of 2:42.
The emulsified asphalt of the comparative example was prepared by the following method:
(1) Preparing a component A: the matrix asphalt and the thermoplastic elastomer (linear SBS) are mixed according to the mass ratio and then the composite modified asphalt is prepared under the condition of 175 ℃.
(2) And (3) preparing a component B: adding asphalt emulsifier into water, regulating pH value to 2-3, and regulating temperature to 70 deg.C to obtain soap solution.
(3) And (3) uniformly mixing the component A prepared in the step (1) and the component B prepared in the step (2), and grinding and emulsifying by an emulsifying device to obtain the emulsified asphalt.
The evaporation residues of the emulsified asphalt obtained in examples 1 to 3 and comparative example above were subjected to comparative tests, and the results are shown in the following table 1:
TABLE 1
As can be seen from the detection results in Table 1, compared with the emulsified asphalt prepared from common matrix asphalt and linear SBS, the emulsified asphalt prepared from TB rubber powder modified asphalt, star-shaped SBS, nano alumina and waste edible oil has the advantages that the penetration degree of evaporation residues is obviously improved, the softening point is reduced, and the complex modulus ageing index at 60 ℃ and the rutting factor ageing index at 60 ℃ are obviously reduced. Effectively improves the construction workability and the ageing resistance of the emulsified asphalt. And materials such as waste rubber powder, waste edible oil and the like can be effectively utilized, and the method has obvious economic and environmental protection advantages.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (5)
1. The preparation method of the anti-aging modified emulsified asphalt is characterized by comprising the following preparation steps:
(1) Preparing a component A: mixing TB rubber powder modified asphalt, a thermoplastic elastomer, nano aluminum oxide and waste edible oil, heating to 165-185 ℃ and uniformly stirring and mixing to obtain composite modified asphalt;
(2) And (3) preparing a component B: adding an asphalt emulsifier into water to prepare soap solution, and adjusting the pH value of the soap solution to 2-3 at 65-80 ℃;
(3) Uniformly mixing the component A prepared in the step (1) and the component B prepared in the step (2), and grinding and emulsifying by an emulsifying device to obtain the anti-aging modified emulsified asphalt;
the TB rubber powder modified asphalt in the step (1) is prepared by mixing waste rubber powder and asphalt with the mass ratio of 1 (3-4) at the temperature of 210-230 ℃; the content of rubber hydrocarbon in the waste rubber powder is 50% -58%;
the thermoplastic elastomer in the step (1) is star-shaped SBS with 20-25 MPa of tensile strength;
in the step (1), the mass ratio of the TB rubber powder modified asphalt, the thermoplastic elastomer, the nano aluminum oxide and the waste edible oil is 85-93:2-4:1-1.5:5-15;
the asphalt emulsifier in the step (2) is a cationic emulsifier; the mass ratio of the asphalt emulsifier to the water is 1-3:35-45;
and (3) mixing the component A and the component B in the step (3) according to the mass ratio of (6.8-7.5) to 3.
2. The method for preparing the anti-aging modified emulsified asphalt according to claim 1, wherein the particle size of the nano alumina in the step (1) is 40-70 nm.
3. The method for preparing anti-aging modified emulsified asphalt according to claim 1, wherein the water content of the waste edible oil in the step (1) is 0.1% -0.2%.
4. An anti-aging modified emulsified asphalt characterized by being prepared by the method of any one of claims 1 to 3.
5. The use of an anti-aging modified emulsified asphalt according to claim 4 in ultra-thin asphalt covers.
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