CN114573973A - Asphalt warm-mixing agent, warm-mixed asphalt mixture, and preparation method and application thereof - Google Patents
Asphalt warm-mixing agent, warm-mixed asphalt mixture, and preparation method and application thereof Download PDFInfo
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- CN114573973A CN114573973A CN202210251088.9A CN202210251088A CN114573973A CN 114573973 A CN114573973 A CN 114573973A CN 202210251088 A CN202210251088 A CN 202210251088A CN 114573973 A CN114573973 A CN 114573973A
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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
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
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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
- C04B26/26—Bituminous materials, e.g. 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
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention provides an asphalt warm-mixing agent which comprises 10-19 parts by weight of octadecanoic acid, 2-5 parts by weight of polyacrylate, 70-85 parts by weight of alkylphenol polyoxyethylene and 4-16 parts by weight of XT-1 type asphalt anti-stripping agent, is easy to obtain raw materials, is simple to prepare, can obviously reduce the mixing temperature of an asphalt mixture, and is beneficial to energy conservation, emission reduction and cost reduction. The invention also provides a warm-mix asphalt mixture and a preparation method thereof, and the warm-mix asphalt mixture comprises matrix asphalt, an asphalt warm-mix agent, aggregate and mineral powder, and can also comprise rock asphalt, so that the warm-mix asphalt mixture has better comprehensive performance.
Description
Technical Field
The invention relates to the technical field of environment-friendly asphalt, and particularly relates to an asphalt warm-mixing agent, a warm-mixed asphalt mixture, and a preparation method and application thereof.
Background
In recent years, many abnormal climatic phenomena frequently appear, seriously threaten the normal life of human beings, and one of the reasons for the current situation is CO2And the consequent greenhouse effect and global warming. Road construction is a significant national capital construction project, and development of road construction promotes development of national economy on one hand and brings great convenience to people's trips on the other hand. However, a large amount of CO is often generated during the paving process of road construction2The greenhouse gases are equivalent to the environmental protection concept of energy conservation and emission reduction, thereby bringing about wide attention of people.
In road construction, the asphalt pavement is paved by hot-mix or warm-mix asphalt mixture, and the production process of the hot-mix asphalt mixture needs high-temperature heating to generate a large amount of smoke dust and CO2And itIt is harmful gas, and high temperature heating also easily makes pitch take place thermal ageing, shortens the life of bituminous paving. In order to protect the environment and reduce the carbon emission of asphalt pavement, road science and technology practitioners propose a method for paving an asphalt pavement by adopting modified asphalt and a warm mixing technology, and the asphalt mixing temperature can be reduced while the strength and viscosity of the asphalt meet the pavement paving requirements. At present, most of product advertisements of warm mixing technologies are advertised to reduce the cooling effect of 30-40 ℃, but practice shows that most of the products can only achieve the effect of 10-20 ℃, and many warm mixing technologies are difficult to be applied to the existing production equipment in China, so that large-area popularization and application are greatly limited. In addition, the existing warm mixing technology reduces the mixing temperature, simultaneously damages part of road performance of the asphalt mixture to different degrees and reduces the service life of the road.
Therefore, the asphalt warm-mixing agent is economic, environment-friendly and wide in applicability, the road performance of the asphalt mixture is improved, the production mixing temperature can be effectively reduced, the purposes of energy conservation and emission reduction are achieved, the construction cost is saved, and the asphalt warm-mixing agent is easy to popularize and apply.
Disclosure of Invention
The invention aims to provide an asphalt warm-mixing agent which is used for preparing a warm-mixed asphalt mixture and further used for paving an asphalt road.
The invention provides an asphalt warm-mixing agent, which comprises the following components in parts by weight:
in some embodiments of the invention, the warm mix of asphalt has a viscosity at 135 ℃ of 225 mpa-s or less; preferably 210mpa · s or less.
In some embodiments of the present invention, the warm mix asphalt comprises 10 parts by weight of octadecanoic acid, 3 parts by weight of polyacrylic acid, 75 parts by weight of alkylphenol ethoxylate, and 8 parts by weight of XT-1 type asphalt anti-stripping agent; alternatively, the first and second electrodes may be,
comprises 10 weight parts of octadecanoic acid, 4 weight parts of polyacrylic acid, 80 weight parts of alkylphenol polyoxyethylene and 12 weight parts of XT-1 type asphalt anti-stripping agent; alternatively, the first and second electrodes may be,
comprises 16 weight parts of octadecanoic acid, 2 weight parts of polyacrylic acid, 70 weight parts of alkylphenol polyoxyethylene and 16 weight parts of XT-1 type asphalt anti-stripping agent; alternatively, the first and second electrodes may be,
comprises 16 weight parts of octadecanoic acid, 5 weight parts of polyacrylic acid, 85 weight parts of alkylphenol polyoxyethylene and 4 weight parts of XT-1 type asphalt anti-stripping agent; alternatively, the first and second electrodes may be,
comprises 16 weight portions of octadecanoic acid, 3 weight portions of polyacrylic acid, 75 weight portions of alkylphenol polyoxyethylene and 12 weight portions of XT-1 type asphalt anti-stripping agent.
The second aspect of the invention provides a warm-mix asphalt mixture, which comprises matrix asphalt, an asphalt warm-mix agent, aggregate and mineral powder; the asphalt warm-mixing agent is the asphalt warm-mixing agent according to the first aspect of the invention, and the weight percentage of the asphalt warm-mixing agent to the matrix asphalt is 2% to 4%.
In some embodiments of the invention, the warm-mix asphalt mix further comprises rock asphalt; and/or the presence of a catalyst in the reaction mixture,
the aggregate is AC-13 grade matching type; and/or the presence of a catalyst in the reaction mixture,
the content of the aggregate is 4-6% of oilstone ratio, wherein the oilstone ratio refers to the percentage of the total weight of the matrix asphalt and the asphalt warm-mixing agent relative to the weight of the aggregate.
In some embodiments of the invention, the warm-mix asphalt mix comprises a base asphalt, an asphalt warm-mix agent, aggregate, mineral fines, and rock asphalt; wherein the content of the first and second substances,
the rock asphalt is Buton rock asphalt, and the mixing amount of the rock asphalt is 30-40 percent, preferably 30 percent of the total weight of the matrix asphalt, the asphalt warm-mixing agent and the aggregate; alternatively, the first and second electrodes may be,
the rock asphalt is Qingchuan rock asphalt, and the mixing amount of the rock asphalt is 15-20 percent, preferably 15 percent of the total weight of the matrix asphalt, the asphalt warm-mixing agent and the aggregate.
In some embodiments of the invention, the base asphalt in the warm mix asphalt mixture is SK70# base asphalt.
The third aspect of the invention provides a preparation method of a warm-mix asphalt mixture, which comprises the following preparation steps:
adding an asphalt warm-mixing agent into the matrix asphalt, and stirring at 130-140 ℃ to prepare soft asphalt;
adding the soft asphalt into the aggregate at 145-155 ℃ for premixing to prepare a premixed material;
adding mineral powder and optionally rock asphalt into the system, and remixing at 135-145 ℃ to prepare the warm-mixed asphalt mixture;
wherein the raw material formula of the warm mix asphalt mixture is as defined in the second aspect of the invention.
In some embodiments of the present invention, the preparation method of the warm-mix asphalt mixture comprises the following preparation steps:
adding the asphalt warm-mixing agent into the matrix asphalt, and stirring for 25-35 minutes at the temperature of 130-140 ℃ at the stirring speed of 1000-1100 rpm to prepare the soft asphalt;
heating the aggregate to 145-155 ℃, and stirring for more than 85 seconds;
adding the soft asphalt into the aggregate at 145-155 ℃, and pre-mixing for 55-65 seconds at 145-155 ℃ at a stirring speed of 50-60 rpm to prepare a pre-mixed material;
adding the mineral powder into the system, remixing for 45-55 seconds at 135-145 ℃ at a stirring speed of 50-60 rpm, adding the rock asphalt, remixing for 55-65 seconds at 135-145 ℃ at a stirring speed of 50-60 rpm, and preparing a remixed material;
compacting and molding the remixed material at 125-135 ℃ to obtain the warm-mixed asphalt mixture.
The fourth aspect of the invention provides an application of the warm-mix asphalt mixture provided by the first aspect of the invention, or the warm-mix asphalt mixture provided by the second aspect of the invention, or the warm-mix asphalt mixture prepared by the preparation method provided by the third aspect of the invention in road paving.
The warm asphalt mixing agent provided by the invention uses octadecanoic acid to reduce the surface tension of the mixture and has the effects of promoting the mixture to be uniformly distributed and stable in performance, alkylphenol ethoxylates is used as a nonionic surfactant, polyacrylate provides a flocculation effect, stone materials with different acid-base properties of the XT-1 type asphalt anti-stripping agent and asphalt have better adhesiveness, all components are cooperated with each other and act on the matrix asphalt together to soften the matrix asphalt to prepare soft asphalt, the Brookfield viscosity at 135 ℃ is basically below 230mpa · s, part of the soft asphalt can be reduced to below 210 and even about 200, so that the soft asphalt is fully mixed with the aggregate at the temperature lower than 155 ℃, the warm asphalt mixing agent is beneficial to energy conservation and emission reduction, and the cost is reduced, and the warm asphalt mixing agent is suitable for popularization and application.
The warm-mixed asphalt mixture provided by the invention is simple to prepare, low in mixing temperature and low in carbon emission, and accords with the environmental protection concept.
The warm mix asphalt mixture provided by the invention is used for paving the asphalt pavement, and the paved asphalt pavement has strong high-temperature stability, low-temperature crack resistance and water damage resistance and long service life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a bar graph of 135 ℃ Brookfield viscosity data for 16 sets of warm mix asphalt mix of example 1;
FIG. 2 shows the dynamic stability of the mixture under different mixing amounts of Qingchuan rock asphalt;
FIG. 3 shows the dynamic stability of the mixture under different mixing amounts of Buton-type rock asphalt;
FIG. 4 is a diagram of a semi-circle bend-pull test (SCB) simulation;
FIG. 5 is a maximum load P of the mixture under different mixing amounts of the Qingchuan type rock asphalt;
FIG. 6 shows the maximum load P of the mixture under different mixing amounts of the Buton-type rock asphalt;
FIG. 7 shows the bending tensile strength R of the mixture of the Qingchuan rock asphalt with different mixing amounts;
FIG. 8 shows the bending and tensile strength R of the mixture under different mixing amounts of Buton-type rock asphalt;
FIG. 9 shows the fracture energy density of the mixture under different mixing amounts of the Qingchuan rock asphalt;
FIG. 10 shows the fracture energy density of the mixture for different amounts of Buton-type rock asphalt.
Detailed Description
The invention is further illustrated below with reference to the figures, embodiments and examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the claims appended to the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Term(s) for
Unless otherwise stated or contradicted, terms or phrases used herein have the following meanings:
the term "and/or", "and/or" as used herein is intended to be inclusive of any one of two or more of the associated listed items and also to include any and all combinations of the associated listed items, including any two or any more of the associated listed items, or any and all combinations of the associated listed items. It should be noted that when at least three items are connected by at least two conjunctive combinations selected from "and/or", "or/and", "and/or", it should be understood that, in the present application, the technical solutions definitely include the technical solutions all connected by "logic and" and also the technical solutions all connected by "logic or". For example, "A and/or B" includes A, B and A + B. For example, the embodiments of "a, and/or, B, and/or, C, and/or, D" include any of A, B, C, D (i.e., all embodiments using a "logical or" connection), any and all combinations of A, B, C, D, i.e., any two or any three of A, B, C, D, and four combinations of A, B, C, D (i.e., all embodiments using a "logical and" connection).
The terms "preferably", "better", and the like are used herein only to describe better embodiments or examples, and it should be understood that the scope of the present invention is not limited by these terms.
In the present invention, "further", "still further", "specifically" and the like are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of the present invention.
In the present invention, the terms "first", "second", "third", "fourth", etc. in the terms of "first aspect", "second aspect", "third aspect", "fourth aspect", etc. are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity, nor as implying that importance or quantity indicating the technical feature being indicated. Also, "first," "second," "third," "fourth," etc. are used for non-exhaustive enumeration of description purposes only and should not be construed as a closed limitation to the number.
In the present invention, the technical features described in the open type include a closed technical solution composed of the listed features, and also include an open technical solution including the listed features.
In the present invention, where a range of values (i.e., a numerical range) is recited, unless otherwise stated, alternative distributions of values within the range are considered to be continuous and include both the endpoints of the range (i.e., the minimum and maximum values) and each of the values between the endpoints. Unless otherwise specified, when a numerical range refers to integers only within the numerical range, both endpoints of the numerical range are inclusive of the integers and each integer between the endpoints is inclusive of the integer. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, the ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
The temperature parameter in the present invention is not particularly limited, and may be a constant temperature treatment or a variation within a certain temperature range. It will be appreciated that the described thermostatic process allows the temperature to fluctuate within the accuracy of the instrument control. Allowing fluctuations in the range of, for example,. + -. 5 deg.C,. + -. 4 deg.C,. + -. 3 deg.C,. + -. 2 deg.C, + -. 1 deg.C.
In the present invention, the average value is generally referred to as the size, particle diameter and diameter, unless otherwise specified.
In the present invention, the molecular weight is an average molecular weight unless otherwise specified.
In the present invention, the stone and the mineral aggregate have the same meaning, and are not particularly limited and may be used interchangeably. Rock material with a grading pattern is called aggregate.
In the present invention, the amount of the rock asphalt to be blended is, without particular limitation, the mass percentage of the rock asphalt to the blending object.
In the present invention, the asphalt-to-stone ratio is, unless otherwise specified, the weight percentage of the base asphalt (when the asphalt warm-mix agent is not contained) or the soft asphalt (when the asphalt warm-mix agent is contained) relative to the stone (or aggregate).
The first aspect of the invention provides a warm asphalt mixing agent, which can reduce the mixing temperature of asphalt and aggregate, save energy, reduce emission and reduce cost, and is suitable for popularization and application.
In a first aspect of the invention, the invention provides an asphalt warm-mixing agent, which comprises the following raw materials in parts by weight:
the polyacrylate adopted by the invention is colorless or yellowish milky liquid, and is easy to polymerize under the action of light, heat and an initiator. In the invention, the polyacrylate can be used for promoting flocculation and improving the stability of various mixed materials during mixing.
In some embodiments of the invention, the polyacrylate is selected from polyethylacrylate or polypropylenoate.
In some embodiments of the present invention, the polyacrylate is present in an amount of 2 to 4 parts by weight based on 10 to 19 parts by weight of octadecanoic acid. Further, the amount of the surfactant may be selected from 2 to 3 parts, 2 to 4 parts and 3 to 4 parts. Exemplary parts by weight are 2, 3, 4.
The octadecanoic acid adopted by the invention is a slightly glossy wax-like small piece, is slightly soluble in cold water, is soluble in alcohol and acetone, and is non-toxic. In the invention, octadecanoic acid can be used for reducing the surface tension of the mixture, and has the effects of promoting the mixture to be uniformly distributed and stabilizing the performance.
In some embodiments of the present invention, the weight part of octadecanoic acid is 10 to 19 parts by weight based on 70 to 80 parts by weight of alkylphenol ethoxylates. Further, the amount of the surfactant may be selected from the group consisting of 10 to 13 parts, 10 to 16 parts, 10 to 19 parts, 13 to 16 parts, 13 to 19 parts and 16 to 19 parts. Examples are parts by mass such as 10, 11, 12, 13, 14, 15, 16, 17, 18, 19.
The alkylphenol polyoxyethylene ether adopted by the invention is easily dissolved in acid and water. The alkylphenol ethoxylates is easy to dissolve in acid and water, and is used as a nonionic surfactant in the invention to reduce interfacial tension and make the mixture more stable in the blending process. The alkylphenol ethoxylates accounts for more than 80% of the total amount of nonylphenol ethoxylates, and also comprises octylphenol polyoxyethylene ether, dodecyl polyoxyethylene ether and the like.
In some embodiments of the present invention, the alkylphenol ethoxylate comprises 70-80 parts by weight based on 10-19 parts by weight of octadecanoic acid. Further, it may be selected from 70 to 75 parts, 70 to 80 parts, and 75 to 80 parts. For example, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80 parts by weight.
The XT-1 type asphalt anti-stripping agent adopted by the invention is suitable for organic high molecular active compounds of acid and alkali stone materials, and particularly has obvious effect on improving the adhesiveness of stone materials such as basalt, andesite, granite and the like with high acid and silicon dioxide content with asphalt, so that an asphalt mixture has good water loss resistance and high-temperature stability, the water loss resistance, the adhesiveness and the strength of an asphalt pavement are further improved, and the pavement performance of the asphalt pavement is comprehensively improved.
In some embodiments, the XT-1 type asphalt anti-stripping agent is present in an amount of 8 to 16 parts by weight based on 10 to 19 parts by weight of octadecanoic acid. Further, the amount of the surfactant may be 8 to 16 parts, 8 to 12 parts, 8 to 10 parts, 10 to 12 parts, 10 to 15 parts, or 12 to 16 parts. Examples are parts by weight such as 8, 9, 10, 11, 12, 13, 14, 15, 16.
The asphalt warm-mixing agent is obtained by mixing the raw materials. Heating may be carried out, but preferably the heating temperature does not exceed 140 ℃. The effect of the warm mix of asphalt can be characterized by brookfield viscosity at 135 ℃. Adding the asphalt warm-mixing agent into the matrix asphalt, heating and stirring to obtain the EM environment-friendly asphalt (namely the soft asphalt of the invention), and carrying out a Brookfield viscosity test. The usage amount of the asphalt warm-mixing agent can be 2-4% of the mass of the matrix asphalt. In some embodiments of the invention, the relative mass ratio is 4%.
In some embodiments of the invention, the asphalt warm-mixing agent is added into the matrix asphalt, and the mixture is stirred at a high speed for 25-35 minutes at a temperature of 130-140 ℃ to prepare the soft asphalt. The rotation speed is preferably 1100 rpm.
When the asphalt warm-mixing agent provided by the invention acts on the matrix asphalt, the components cooperate with each other to act on the matrix asphalt together, so that the matrix asphalt can be softened to prepare the soft asphalt. The Brookfield viscosity at 135 ℃ is basically below 230mpa & s, and part of the brookfield viscosity can be reduced to below 210, even to about 200, so that the brookfield viscosity modifier is fully mixed with the aggregate at the temperature of below 155 ℃, is beneficial to energy conservation and emission reduction, reduces the cost, and is suitable for popularization and application.
The Brookfield viscosity at 135 ℃ is taken as an example. The Brookfield viscosity of the asphalt warm-mixing agent at 135 ℃ is generally below 245mpa & s. In some embodiments of the invention, the warm asphalt mix has a Brookfield viscosity at 135 ℃ of 200mPa s to 245mPa s. In some embodiments, the warm mix of asphalt has a Brookfield viscosity at 135 ℃ of 200mPa s to 240mPa s. In some embodiments, the warm mix asphalt has a Brookfield viscosity at 135 ℃ of 200mPa s to 235mPa s. In some embodiments, the warm mix of asphalt has a Brookfield viscosity at 135 ℃ of 200mPa s to 230mPa s. In some embodiments, the warm mix of asphalt has a Brookfield viscosity at 135 ℃ of 200mPa s to 225mPa s. In some embodiments, the warm mix of asphalt has a Brookfield viscosity at 135 ℃ of 200mPa s to 220mPa s.
In some embodiments, the warm mix of asphalt has a viscosity of no greater than 225 mpa-s at 135 ℃; preferably not higher than 210 mPa.s, more preferably about 200 mPa.s, where "about" may mean. + -. 2 mPa.s, more preferably 1 mPa.s.
In some embodiments of the present invention, the warm asphalt mixture comprises, in parts by weight:
in some embodiments of the present invention, the warm asphalt mixture comprises, in parts by weight:
in some embodiments of the present invention, the warm asphalt mixture comprises, in parts by weight:
in some embodiments of the present invention, the warm asphalt mixture comprises, in parts by weight:
in some embodiments of the present invention, the warm asphalt mixture comprises, in parts by weight:
the second aspect of the invention provides a warm mix asphalt mixture, which is used for asphalt road pavement, has a lower mixing temperature, can reduce the mixing temperature by about 25 ℃ compared with a hot mix asphalt mixture, can reduce the mixing temperature by about 40 ℃ compared with an SBS modified asphalt mixture, is easy to operate, and can effectively reduce carbon emission, reduce smoke and toxic gas emission and protect the environment compared with the conventional hot mix asphalt mixture and SBS modified asphalt mixture at present.
Herein, SBS is an abbreviation for styrene-butadiene-styrene block copolymer.
In a second aspect of the invention, a warm-mix asphalt mixture is provided, comprising matrix asphalt, an asphalt warm-mix agent, aggregate and mineral powder; wherein the weight percentage of the asphalt warm-mixing agent relative to the matrix asphalt is 2-4%.
In some embodiments of the invention, the aggregate is an AC-13 grade.
In some embodiments of the invention, the aggregate is present in an amount of 4% to 6% oilstone ratio, where oilstone ratio refers to the percentage of the total weight of the base asphalt and the warm mix of asphalt relative to the weight of the aggregate.
In some embodiments of the invention, the warm mix asphalt mixture comprises base asphalt, warm mix asphalt, aggregate, mineral fines, and rock asphalt. Suitable additions of rock asphalt (e.g., about 30% Buton rock asphalt, or about 20% Qingchuan rock asphalt) can improve high temperature performance, low temperature performance, water stability, fracture resistance, and fatigue resistance.
In some embodiments of the invention, the rock asphalt is Buton rock asphalt, and the rock asphalt is incorporated in an amount of 20% to 40%, preferably about 30%, of the total weight of the base asphalt, the warm-mix asphalt, and the aggregate. Here, "about" may mean. + -. 2%, and further may be. + -. 1%.
In some embodiments of the present invention, the amount of the rock asphalt is 20% to 40% of the total weight of the base asphalt, the asphalt warm-mix agent and the aggregate, and further may be selected from 20% to 25%, 22% to 28%, 30% to 36%, 35% to 38%, 25% to 40%, and the like. For example, 20%, 25%, 28%, 30%, 35%, 38%, 40%, etc.
In some embodiments of the invention, the rock asphalt is a Qingchuan rock asphalt, and the rock asphalt is incorporated in an amount of 15% to 30%, preferably about 20%, of the total weight of the base asphalt, the warm-mix asphalt and the aggregate. Here, "about" may mean. + -. 2%, and further may be. + -. 1%.
In some embodiments of the present invention, the mixing amount of the rock asphalt is 15% to 30% of the total weight of the base asphalt, the asphalt warm-mixing agent and the aggregate, and further may be selected from 15% to 18%, 16% to 25%, 18% to 30%, 15% to 25%, 18% to 25%, and the like. E.g., 15%, 18%, 20%, 22%, 25%, 28%, 30%, etc.
In some embodiments of the invention, the base asphalt is SK70# base asphalt.
The third aspect of the invention provides a preparation method of the warm-mix asphalt mixture, which can be used for preparing the warm-mix asphalt mixture of the second aspect of the invention, and has the advantages of simple preparation operation, lower preparation temperature and environmental protection value.
In a third aspect of the present invention, a preparation method of a warm-mix asphalt mixture is provided, and the formula of the warm-mix asphalt mixture provided in the second aspect of the present invention includes the following preparation steps:
s100: adding an asphalt warm-mixing agent into the matrix asphalt, and stirring at 130-140 ℃ to prepare soft asphalt;
s200: adding the soft asphalt into the aggregate at 145-155 ℃ for premixing to prepare a premixed material;
s300: adding mineral powder into the system, remixing at 135-145 ℃ to prepare remixed material, compacting and molding at 125-135 ℃ to prepare the warm-mixed asphalt mixture;
s100: preparation of soft asphalt
In some embodiments, in step S100, the asphalt warm-mixing agent is added to the base asphalt and stirred at 130 ℃ to 140 ℃, for example, 130 ℃, 132 ℃, 135 ℃, 138 ℃, 140 ℃, etc. In some embodiments, the stirring time is 20min to 50min, further 25min to 35min, such as 20min, 25min, 28min, 30min, 35min, 40min, 45min, 50min, and the like. In some embodiments, the stirring speed is 1000-1100 rpm, and further can be 900-1000 rpm, such as 900rpm, 950rpm, 1000rpm, 1050rpm, 1100rpm, etc.
S200: preparing a premixed material;
in some embodiments, in step S200, the soft asphalt is added to the aggregate at 145 ℃ to 155 ℃ for pre-mixing to obtain a pre-mix.
In some embodiments, in step S200, the aggregate is heated to 145 ℃ to 155 ℃ and stirred for more than 85 seconds.
In some embodiments, in step S200, the soft asphalt is added to the aggregate at 145-155 ℃ and pre-mixed at 145-155 ℃, for example 145 ℃, 147 ℃, 150 ℃, 152 ℃, 155 ℃, etc. The time for the premixing is 55 to 65 seconds, for example, 55 seconds, 56 seconds, 58 seconds, 60 seconds, 62 seconds, 65 seconds, and the like. The stirring speed of the pre-stirring is 50 to 60rpm, for example, 50rpm, 52rpm, 54rpm, 56rpm, 58rpm, and 60 rpm.
S300: preparation of warm mix asphalt mixture
In some embodiments, in step S300, the mineral powder is added to the system and remixed at 135-145 ℃ to prepare remixed material. Examples of the temperature of the re-stirring include 135 ℃, 137 ℃, 140 ℃, 142 ℃, 145 ℃ and the like.
In some embodiments, in step S300, after adding the mineral powder to the system for remixing, rock asphalt is also added for remixing to prepare a warm-mix asphalt mixture. In some embodiments, in step S300, the rock asphalt is added and then remixed at 135 ℃ to 145 ℃ for 55 to 65 seconds, such as 55 seconds, 56 seconds, 58 seconds, 60 seconds, 62 seconds, 65 seconds, and the like. The stirring speed of the back-stirring is 50 to 60rpm, for example, 50rpm, 52rpm, 54rpm, 56rpm, 58rpm, 60rpm, and the like.
In some embodiments, in step S300, after adding the mineral powder and the rock asphalt into the system and re-mixing, a re-mixed material is obtained, and the re-mixed material is compacted and molded at 125-135 ℃ to prepare a warm-mixed asphalt mixture. In some embodiments, the compaction forming temperature is 125 ℃ to 135 ℃, such as 125 ℃, 127 ℃, 130 ℃, 132 ℃, 135 ℃ and the like.
In a fourth aspect of the invention, there is provided the use of the warm-mix asphalt agent or the warm-mix asphalt mixture for road paving.
The warm mix asphalt mixture prepared by the invention generally has the following excellent performances: the penetration degree is 70-85, the softening point is 45-55 ℃, the ductility at 10 ℃ is 75-160 cm, and the Brookfield viscosity at 135 ℃ is 250-500 mpa-s.
In some embodiments of the invention, the penetration of the prepared warm-mix asphalt mixture is 70-85. in some embodiments of the invention, the softening point of the prepared warm-mix asphalt mixture is 47-52 ℃.
In some embodiments of the invention, the prepared warm mix asphalt mixture has a ductility of 75cm to 160cm at 10 ℃.
In some embodiments of the invention, the brookfield viscosity at 135 ℃ of the resulting warm mix asphalt is in the range of 280 mpa-s to 500 mpa-s.
In some embodiments of the invention, the prepared warm mix asphalt mixture has a penetration degree of 70-85, a softening point of 47-52 ℃, an extensibility of 75-160 cm at 10 ℃ and a brookfield viscosity of 280-500 mpa-s at 135 ℃.
Some specific examples are as follows.
Experimental parameters not described in the following specific examples are preferably referred to the guidelines given in the present application, and may be referred to experimental manuals in the art or other experimental methods known in the art, or to experimental conditions recommended by the manufacturer.
The starting materials and reagents mentioned in the following specific examples are commercially available or can be prepared by those skilled in the art according to known means.
In the following specific examples, the mineral aggregates (aggregates, stones) were of the AC-13 grade type, unless otherwise specified.
Example 1 determination of asphalt Warm-mix formulation, amount of asphalt to be incorporated
1.1 orthogonal test for determining asphalt warm-mixing agent formula
1.1.1 preparation of asphalt warm-mixing agent
The use amounts of octadecanoic acid, polyacrylate, alkylphenol polyoxyethylene and XT-1 type asphalt anti-stripping agent are used as four factors, four levels of I, II, III and IV are respectively set, and orthogonal tests are carried out. The test data are shown in Table 1.
Table 1: four-factor four-level orthogonal test data sheet
In table 1, the values for the levels of each factor are in grams.
The components with various factor levels are uniformly mixed according to the numerical values shown in the table 1 to obtain 16 groups of asphalt warm-mixing agents.
1.1.2 preparation of Warm mix asphalt mixture
Preparing the 16 groups of asphalt warm-mixing agents in the 1.1.1 into warm-mixed asphalt mixtures with the serial numbers of test numbers 1-16, wherein the preparation method comprises the following steps:
(1) heating SK70# base asphalt 100 weight parts to 135 deg.C, adding asphalt warm-mixing agent 4 weight parts under stirring, and stirring with high speed shearing machine for 30min to obtain soft asphalt.
(2) Heating 100 parts by weight of AC-13 graded aggregate to 150 ℃, stirring for 1.5min, adding 4.8 parts by weight of soft asphalt, stirring for 1min, adding 1 part by weight of mineral powder, and stirring for 50s to obtain a warm mix asphalt mixture (test number 1-16).
1.1.3 viscosity test
Test numbers 1-16 were tested using Brookfield viscosity at 135 ℃. The test results are shown in table 2 and fig. 1.
Table 2: 135 ℃ Brookfield viscosity of test Nos. 1 to 16
According to the data analysis, the four materials are considered to have the influence on the viscosity of the asphalt because the four materials are all liquid substances, and the asphalt is diluted after mixing, so that the surface tension between asphalt molecules is reduced, and the viscosity is reduced. However, when the content of the material reaches a certain limit, the viscosity rises due to chemical interaction between the various materials.
According to the orthogonal test result, the dosage ratio of the octadecanoic acid, the polyacrylate, the alkylphenol polyoxyethylene and the XT-1 type asphalt anti-stripping agent is 16:3:75:12, and the dosage ratio is used as the ratio for subsequent testing.
1.2 Single factor test to determine the mixing amount of the asphalt warm-mixing agent
1.2.1 preparation of asphalt warm-mixing agent
The asphalt warm-mixing agent is prepared by adopting a formula obtained by a 1.1 orthogonal test according to the weight part ratio of octadecanoic acid, polyacrylate, alkylphenol polyoxyethylene and XT-1 type asphalt anti-stripping agent of 16:3:75: 12.
1.2.2 preparation of Soft Pitch
The soft asphalt is prepared by the preparation method basically the same as that of 1.2, except that 0, 1, 2, 3, 4, 5, 6 and 7 parts by weight of asphalt warm-mixing agent (prepared in 1.2.1) is respectively added into 100 parts by weight of SK70# base asphalt to prepare 8 groups of warm-mixed asphalt (test numbers 17-24), and the performance indexes of the test numbers 17-24 are measured.
1.2.3 Performance testing
The soft asphalt was subjected to penetration, softening point, ductility at 10 ℃ and viscosity (110 ℃, 120 ℃, 135 ℃) tests according to the operating method of road engineering asphalt and asphalt mixture test protocol JTG E20-2011. The test results are shown in Table 3.
Table 3: performance test results of test Nos. 17 to 24
According to the table 3, when the mixing amount of the asphalt warm-mixing agent is 2% -4%, the soft asphalt has good performances: the penetration (0.1mm), softening point and 10 ℃ ductility are all optimal.
Example 2 preparation of SK70# type warm mix asphalt mixture
2.1 preparation of asphalt warm-mixing agent
The asphalt warm-mixing agent is prepared according to the weight part ratio of octadecanoic acid, polyacrylate, alkylphenol polyoxyethylene and XT-1 type asphalt anti-stripping agent of 16:3:75: 12.
2.2 preparation of Soft Pitch
100 parts by weight of SK70# base asphalt is heated to 135 ℃, the blended asphalt warm-mixing agent (3 parts by weight) is added under the stirring state, and the mixture is stirred for 30min by a high-speed shearing machine to prepare the soft asphalt.
2.3 preparation of premixed feeds
100 parts by weight of AC-13 graded aggregate is heated to 150 ℃, stirred for 1.5min, added with 4.8 parts by weight of soft asphalt (prepared in 2.2, the oil-stone ratio is 4.8%) and stirred for 1min to prepare the ready-mixed material.
2.4 preparation of Warm mix asphalt mixture
Adding 1 weight part of mineral powder, stirring for 50s, mixing to obtain a remixed material, compacting and molding the remixed material at 125-135 ℃ to obtain the SK70# warm-mix asphalt mixture.
Example 3 preparation of 0.3% Asp-SK70# Warm mix asphalt
A warm mix asphalt mixture of 0.3% Asp-SK70# was prepared in substantially the same manner as in example 2, except that:
in the preparation of the soft asphalt: adding 3 parts by weight of
A warm mix;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
Example 4 preparation of Soft asphalt + Qingchuan type (QC) Warm mix asphalt mixture
4.1 preparation of Soft asphalt + 10% QC type Warm mix asphalt mixture
A soft asphalt + 10% QC type warm mix asphalt mixture was prepared in substantially the same manner as in example 2, except that:
adding mineral powder, stirring, adding 10% of Qingchuan rock asphalt, and stirring at 140 ℃ for 1 minute to obtain a mixture of maltha and 10% of QC warm-mix asphalt;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
4.2 soft asphalt + 15% QC type warm mix asphalt mixture
A maltha + 15% QC-type warm mix was prepared in substantially the same manner as in example 2, except that:
adding mineral powder, stirring, adding 15% of Qingchuan rock asphalt, and stirring at 140 ℃ for 1 minute to obtain a mixture of maltha and 15% of QC warm mix asphalt;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
4.3 Soft asphalt + 20% QC type warm mix asphalt mixture
A soft asphalt + 20% QC type warm mix asphalt mixture was prepared in substantially the same manner as in example 2, except that:
adding mineral powder, stirring, adding 20% of Qingchuan rock asphalt, and stirring at 140 ℃ for 1 minute to obtain a mixture of maltha and 20% of QC warm mix asphalt;
the remaining parameters, including the type of raw materials, the amounts used, and the preparation method, were the same as in example 1.
4.4 Soft asphalt + 25% QC type warm mix asphalt mixture
A maltha + 25% QC-type warm mix was prepared in substantially the same manner as in example 2, except that:
adding mineral powder, stirring, adding 25% of Qingchuan rock asphalt, and stirring at 140 ℃ for 1 minute to obtain a mixture of maltha and 25% of QC warm mix asphalt;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
Example 5 preparation of a Soft asphalt + Buton type (Buton) Warm mix asphalt
5.1 preparation of Soft asphalt + 10% Buton type Warm mix asphalt mixture
A maltha + 10% Buton type warm mix asphalt mixture was prepared in substantially the same manner as in example 2, except that:
adding mineral powder, stirring, adding 10% of Buton type rock asphalt, and stirring at 140 ℃ for 1 minute to obtain a mixture of maltha and 10% of Buton type warm-mix asphalt;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
5.2 Soft asphalt + 20% Buton type warm mix asphalt mixture
A maltha + 20% Buton warm mix asphalt mixture was prepared in substantially the same manner as in example 2, except that:
adding mineral powder, stirring, adding 20% of Buton type rock asphalt, and stirring at 140 ℃ for 1 minute to obtain a mixture of maltha plus 20% of Buton type warm mix asphalt;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
5.3 Soft asphalt + 30% Buton warm mix asphalt mixture
A maltha + 30% Buton warm mix asphalt mixture was prepared in substantially the same manner as in example 2, except that:
adding the mineral powder, stirring, adding 30% of Buton type rock asphalt, and stirring at 140 ℃ for 1 minute to obtain a mixture of maltha and 30% of Buton type warm mix asphalt;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
5.4 Soft asphalt + 40% Buton type warm mix asphalt mixture
A maltha + 40% Buton warm mix asphalt mix was prepared in substantially the same manner as in example 2, except that:
adding mineral powder, stirring, adding 40% of Buton type rock asphalt, and stirring at 140 ℃ for 1 minute to obtain a maltha + 40% of Buton type warm mix asphalt mixture;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
EXAMPLE 6 preparation of SBS modified asphalt mixture
The SBS modified asphalt mixture was prepared by substantially the same method as in example 2 except that:
in the preparation of the soft asphalt: adding 100 parts by weight of SBS modified asphalt;
the other parameters including the kinds of raw materials, the amounts of the raw materials, and the preparation method were the same as in example 1.
Example 7 Performance testing
The following performance tests were performed on the asphalt mixtures prepared in the above examples 2 to 6.
7.1 high temperature Performance test
And (4) testing the high-temperature performance of the asphalt mixture through a domestic rut test. The test results are shown in Table 4. Fig. 2 and 3 can be obtained from the data of table 4.
TABLE 4 dynamic stability test results of warm mix asphalt mixture
And (4) supplementary notes: in the table, "soft asphalt" indicates soft asphalt obtained by adding 3% of asphalt warm-mixing agent to SK70# base asphalt; "QC" refers to Qingchuan rock bitumen, "Buton" refers to Buton rock bitumen; "soft asphalt + 10% QC" means a pre-mixed reinforced environment-friendly asphalt mixture obtained by adding 10% of Qingchuan rock asphalt after the ore material is pre-mixed by the soft asphalt and then performing re-mixing reinforcement; the rest of the expressions are the same.
As can be seen from table 4, fig. 2 and fig. 3:
(1) the dynamic stability value DS of the warm-mix asphalt mixture is less than that of the SK70# warm-mix asphalt mixture, and after rock asphalt is added for re-mixing, the dynamic stability values are all greater than that of the SK70# warm-mix asphalt mixture.
(2) The dynamic stability of the warm-mix asphalt mixture shows a trend of increasing and then decreasing with the increase of the rock asphalt mixing amount.
(3) For the warm-mixed asphalt mixture added with Qingchuan (QC) rock asphalt, when the addition proportion of the Qingchuan rock asphalt is 10%, the dynamic stability is 2.5 times of that of matrix asphalt; when the addition ratio of Qingchuan is 20%, the dynamic stability is the greatest.
(4) For a warm mix asphalt mixture added with Buton (Buton) rock asphalt, when the mixing amount of the Buton rock asphalt is 30%, the dynamic stability value exceeds that of the SBS modified asphalt mixture, and the dynamic stability value shows a tendency of gradually stabilizing along with the continuous increase of the mixing amount of the Buton rock asphalt.
(5) The experimental phenomena show that the rock asphalt can obviously improve the high-temperature performance of the mixture. The analysis shows that the above results appear because the rock asphalt is a substance which is formed under various complicated conditions of high temperature and high pressure, microbial decomposition, inorganic matter catalyst and the like for thousands of years and coexists with nature for a long time, the nitrogen element content in the composition is very high, and the substance exists mostly in the form of functional groups, and the functional groups in the form can obviously enhance the adhesion capability between the asphalt and the aggregates, so that the mixture can form a more compact whole and is macroscopically represented as the enhancement of the anti-rutting capability, which is the concrete embodiment of the 'enhancing' function in the premixing enhancement technology.
(6) In order to ensure that the warm-mixed asphalt mixture has good high-temperature performance, the mixing amount of the Buton rock asphalt is recommended to be 30-40%, and the mixing amount of the Qingchuan rock asphalt is recommended to be 15-20%.
7.2 Low temperature Performance test
And testing the low-temperature performance of the asphalt mixture by adopting a semicircular bending and pulling test.
The semicircular bending and pulling test is a method introduced from rock mechanics for evaluating the tensile property of the asphalt mixture. The SCB test equipment is simple, the test piece is formed by cutting a Marshall test piece into two parts along the diameter direction, a three-point round bar loading mode is selected during the test, and the stress sketch is shown in figure 4.
The SCB test is carried out on a universal testing machine, and the distance between two riding wheels at the lower end is 0.8 times of the diameter of an SCB test piece during the test, namely S is 0.8D. During the test, the test piece is firstly placed in an environment box with the temperature of minus 10 ℃ and is kept warm for 3 hours, and then the test piece is loaded by a universal testing machine at the speed of 50mm/min until the test piece is damaged. In the test process, a relation graph of load and displacement is directly recorded by a computer, each group of parallel tests are carried out for 2 times, and then indexes such as breaking load, tensile strength, breaking energy density and the like are respectively calculated by using formulas 1, 2 and 3 according to test results.
Wherein R is tensile strength, MPa; p is the maximum load, N; d is the diameter of the test piece, mm; t is the thickness of the test piece in mm.
In the formula, epsilon is the strain at the center of the bottom of the test piece; d is the deflection of the center of the bottom of the test piece, and is mm; s is the distance between two tugs, 0.8D, mm.
In the formula (I), the compound is shown in the specification,
kPa, the fracture density energy; epsilon0The strain value is corresponding to the peak point of the stress in the stress-strain curve.
The formed Marshall test piece is cut into two semi-circles with equal size along the diameter direction, then a semi-circle bending-pulling test (SCB) test is carried out under the condition of-10 ℃, and the low-temperature performance of the premixed reinforced environment-friendly asphalt mixture is evaluated by using three parameters of maximum load, bending-pulling strength and fracture energy density. The test results are shown in Table 5, and FIGS. 5 to 10 can be obtained from the results shown in Table 5.
TABLE 5-10 ℃ asphalt mixture SCB test results
And (4) supplementary notes: in the table, "soft asphalt" indicates soft asphalt obtained by adding 3% of asphalt warm-mixing agent to SK70# base asphalt; "QC" refers to Qingchuan rock bitumen, "Buton" refers to Buton rock bitumen; "soft asphalt + 10% QC" means a ready-mixed reinforced environment-friendly asphalt mixture obtained by adding 10% of Qingchuan rock asphalt into the soft asphalt to be subjected to ready mixing and reinforcement on mineral aggregate; the rest of the expressions are the same.
As can be seen from table 5 and fig. 5-10:
(1) compared with the current commonly used SK70# matrix asphalt mixture, the SCB test parameters (bending tensile strength, maximum load and fracture energy density) of the warm mix asphalt mixture obtained after adding the rock asphalt are improved to a certain degree. This indicates that rock asphalt can increase the low temperature flexural tensile strength of asphalt mix. The analysis shows that the phenomenon is caused because the asphalt warm-mixing agent is a milky substance which is nearly in a liquid state, and the low-temperature performance of the asphalt is improved after the asphalt warm-mixing agent is added, so that the low-temperature performance of the mixture is also improved.
(2) The SCB test parameters of the Qingchuan (QC) type pre-mixed reinforced environment-friendly mixture are increased along with the increase of the mixing amount of the Qingchuan rock asphalt, but the increasing amplitude is gradually reduced. The content of the Qingchuan rock asphalt has a promotion effect on low-temperature performance, but when the content of the Qingchuan rock asphalt exceeds 20%, the promotion effect is gradually weakened.
(3) The SCB test parameters of the Buton (Buton) type pre-mixed reinforced environment-friendly mixture have the change trend of increasing firstly and then decreasing along with the increase of the content of the Buton rock asphalt, and the low-temperature performance is optimal when the addition amount of the Buton rock asphalt is 40%.
(4) The low temperature performance of the added Qingchuan rock asphalt is better than that of the added Buton rock asphalt under the condition of the same rock asphalt mixing amount, probably because the impurity components in the Qingchuan rock asphalt are less.
(5) When the mixing amount of the Qingchuan rock asphalt exceeds 15 percent and the mixing amount of the Buton rock asphalt exceeds 30 percent, the SCB test parameters of the two mixtures are both less than 0.3 percent of Asp-SK70# warm mix asphalt mixture, which further indicates that the mixing amount of the rock asphalt can influence the low temperature performance of the environment-friendly mixture, and the mixing amount of the rock asphalt needs to be controlled when the pre-mix reinforced mixture is prepared.
7.3 Water stability Performance test
The water stability performance of the asphalt mixture is tested by a water immersion Marshall test.
The Marshall test pieces of the same batch are divided into two groups, the first group is soaked in water at 60 ℃ for 30 minutes and then the stability MS is measured, and the second group is soaked in water at 60 ℃ for 48 hours and then taken out to measure the stability MS1And calculating the soaking residual stability MS0＝MS1(ii)/MS × 100%. The results of the submersion Marshall test are shown in Table 6.
TABLE 6 immersion Marshall test results
And (4) supplementary notes: in the table, "soft asphalt" indicates soft asphalt obtained by adding 3% of asphalt warm-mixing agent to SK70# base asphalt; "QC" means Qingchuan rock asphalt, "Buton" means Buton rock asphalt; "soft asphalt + 10% QC" means a pre-mixed reinforced environment-friendly asphalt mixture obtained by adding 10% of Qingchuan rock asphalt after the ore material is pre-mixed by the soft asphalt and then performing re-mixing reinforcement; the rest of the expressions are the same.
As can be seen from table 6:
(1) the warm-mixed asphalt mixture provided by the invention has excellent water stability and residual stability MS0The content of the amino acid is more than 94 percent and is far larger than that of matrix asphalt, and the retention stability of 0.3 percent of Asp-SK70# warm-mixed asphalt mixture is lower than that of SK70# matrix asphalt mixture;
(2) residual stability MS0The change rule of firstly increasing and then reducing is presented along with the increase of the rock asphalt mixing amount, but the change amplitude is not very large, and the peak value is reached when the addition amount of Qingchuan (QC) rock asphalt is 20% and the addition amount of Buton (Buton) rock asphalt is 30%, and the residual stability of the warm-mixed asphalt mixture is close to that of the SBS asphalt mixture, so that the warm-mixed asphalt mixture provided by the invention has better water damage resistance;
(3) the above results can indicate that the asphalt added with the asphalt warm-mix agent can improve the water damage resistance of the mixture, and also indicate that the correlation between the residual stability and the water damage resistance of the mixture is not very strong, and because the residual stability of the mixtures with various mixing amounts has little variation, other methods are further needed to compare the water stability of the mixtures with various mixing amounts.
7.4 Freeze-thaw cleavage test
Marshall test pieces were divided into two groups: the first group of test pieces are directly tested for the splitting strength R after being kept in water at the temperature of 25 ℃ for 2 hours1(ii) a The second group of test pieces are firstly kept warm for 2 hours in a water bath at 25 ℃, then are placed in a refrigerator at-18 ℃ to be frozen for 16 hours, then are placed in a water bath at 60 ℃ to be kept warm for 24 hours, finally are placed in a water bath at 25 ℃ to be kept warm for 2 hours, and then the splitting strength R of the test pieces is measured2. Calculating the ratio of freezing-thawing splitting strength TSR ═ R2/R1X 100%. The results of the freeze-thaw split test are shown in Table 7.
TABLE 7 Freeze-thaw cleavage test results
And (4) supplementary notes: in the table, "soft asphalt" indicates soft asphalt obtained by adding 3% of asphalt warm-mixing agent to SK70# base asphalt; "QC" refers to Qingchuan rock bitumen, "Buton" refers to Buton rock bitumen; "soft asphalt + 10% QC" means a pre-mixed reinforced environment-friendly asphalt mixture obtained by adding 10% of Qingchuan rock asphalt after the ore material is pre-mixed by the soft asphalt and then performing re-mixing reinforcement; the rest of the expressions are the same.
As can be seen from table 7:
(1) the water stability of the warm-mix asphalt mixture provided by the invention is superior to that of SK70# HMA and 0.3% Asp-SK70# warm-mix asphalt mixture. The freezing-thawing cleavage residual strength ratio TSR value of the warm-mix asphalt mixture of 0.3 percent Asp-SK70# added with the warm-mix agent is smaller than that of the SK70# matrix asphalt mixture, and the TSR values and the cleavage tensile strength R after freezing-thawing of two pre-mixed enhanced environment-friendly mixtures of Qingchuan (QC) rock asphalt and Buton (Buton) rock asphalt added with Qingchuan (QC) rock asphalt2Are all significantly larger than SK70# HMA, and the TSR value and R value are increased along with the increase of the asphalt mixing amount of Qingchuan and Buton rocks2The values all show a rising change trend;
(2) the analysis shows that the TSR values of the warm-mixed asphalt mixture provided by the invention are all larger than HMA due to two common reasons, firstly, the raw material of the warm-mixed asphalt agent contains the anti-stripping agent, and the water stability of the mixture can be improved after the warm-mixed asphalt agent is added; secondly, because the rock asphalt has high wettability and obvious resistance to free oxidation radicals, the adhesiveness and the anti-stripping property of the asphalt and the mixture can be obviously improved, and the water stability of the mixture is improved.
(3) Splitting strength value R of mixture after freeze thawing2The mixing amount of the Qingchuan rock asphalt and the Buton rock asphalt is increased continuously, and when the mixing amount of the Qingchuan rock asphalt is 20 percent or 25 percent, R is2The values are already comparable to those of SBS mixtures, which shows that rock asphalt can improve the split tensile strength of the mixture.
7.5 fatigue resistance test
The fatigue performance of the SAFC premixed reinforced environment-friendly mixture is evaluated by adopting a four-point bending fatigue test.
The test protocol is as follows:
loading a mode: strain control, fixing strain 200 mu epsilon;
loading a waveform: a sine wave;
loading frequency: 10 Hz;
standard test piece size: 385mm × 65mm × 50 mm;
test temperature: keeping the temperature of the test piece in a 15 ℃ temperature control box for not less than 5 hours at 15 ℃;
test termination conditions: the modulus of the test piece is reduced to 50% of the initial stiffness modulus of the test piece or the test piece is cracked.
The results show that: the warm-mixed asphalt mixture provided by the invention has better fatigue performance, the addition of the rock asphalt improves the stiffness of the mixture, and the fatigue performance of the mixture is closely related to the stiffness of the mixture, so the fatigue performance is macroscopically represented by the increase of the fatigue action times.
From the results of the foregoing tests of high temperature performance, low temperature performance, water stability, anti-splitting performance, and anti-fatigue performance, it can be inferred that, for the asphalt mixture of the present invention, the optimum blending amount is about 30% when using the bunton rock asphalt, and about 20% when using the Qingchuan rock asphalt, and the optimum blending amount is recommended to fluctuate within a range of ± 2%, respectively corresponding to 28% to 32%, 18% to 22%, and further 29% to 31%, and 19% to 21%.
All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. The citation referred to herein is incorporated by reference in its entirety for all purposes unless otherwise in conflict with the present disclosure's objectives and/or technical solutions. Where a citation is referred to herein, the definition of a reference in the document, including features, terms, nouns, phrases, etc., that is relevant, is also incorporated by reference. In the present invention, when the citation is referred to, the cited examples and preferred embodiments of the related art features are also incorporated by reference into the present application, but the present invention is not limited to the embodiments. It should be understood that where the citation conflicts with the description herein, the application will control or be adapted in accordance with the description herein.
The technical features of the embodiments and examples described above can be combined in any suitable manner, and for the sake of brevity, all possible combinations of the technical features of the embodiments and examples described above are not described, but should be considered within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above examples are only illustrative of several embodiments of the present invention, and should not be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Furthermore, it should be understood that various changes or modifications can be made by those skilled in the art after reading the above teachings of the present invention, and equivalents obtained thereby also fall within the scope of the present invention. It should also be understood that the technical solutions provided by the present invention, which are obtained by logical analysis, reasoning or limited experiments, are within the scope of the present invention as set forth in the appended claims. Therefore, the scope of the patent of the present invention is subject to the appended claims, and the description and drawings can be used to interpret the contents of the claims.
Claims (10)
1. The asphalt warm-mixing agent is characterized by comprising the following components in parts by weight:
2. the warm asphalt-mix agent as claimed in claim 1, wherein the warm asphalt-mix agent has a viscosity of 225 mpa-s or less at 135 ℃; preferably 210mpa · s or less.
3. The warm mix asphalt mixture according to claim 2, wherein the warm mix asphalt mixture comprises 10 parts by weight of octadecanoic acid, 3 parts by weight of polyacrylic acid, 75 parts by weight of alkylphenol ethoxylate, and 8 parts by weight of XT-1 type asphalt anti-stripping agent; alternatively, the first and second liquid crystal display panels may be,
comprises 10 weight parts of octadecanoic acid, 4 weight parts of polyacrylic acid, 80 weight parts of alkylphenol polyoxyethylene and 12 weight parts of XT-1 type asphalt anti-stripping agent; alternatively, the first and second electrodes may be,
comprises 16 weight parts of octadecanoic acid, 2 weight parts of polyacrylic acid, 70 weight parts of alkylphenol polyoxyethylene and 16 weight parts of XT-1 type asphalt anti-stripping agent; alternatively, the first and second electrodes may be,
comprises 16 weight parts of octadecanoic acid, 5 weight parts of polyacrylic acid, 85 weight parts of alkylphenol polyoxyethylene and 4 weight parts of XT-1 type asphalt anti-stripping agent; alternatively, the first and second electrodes may be,
comprises 16 weight portions of octadecanoic acid, 3 weight portions of polyacrylic acid, 75 weight portions of alkylphenol polyoxyethylene and 12 weight portions of XT-1 type asphalt anti-stripping agent.
4. The warm-mix asphalt mixture is characterized by comprising matrix asphalt, an asphalt warm-mix agent, aggregate and mineral powder; the warm asphalt-mixing agent is the warm asphalt-mixing agent according to any one of claims 1 to 3, and the weight percentage of the warm asphalt-mixing agent to the matrix asphalt is 2% to 4%.
5. The warm-mix asphalt mixture according to claim 4, further comprising rock asphalt; and/or the presence of a catalyst in the reaction mixture,
the aggregate is AC-13 grade matching type; and/or the presence of a catalyst in the reaction mixture,
the content of the aggregate is 4-6% of oilstone ratio, wherein the oilstone ratio refers to the percentage of the total weight of the matrix asphalt and the asphalt warm-mixing agent relative to the weight of the aggregate.
6. The warm-mix asphalt mixture according to claim 4, wherein the warm-mix asphalt mixture comprises base asphalt, asphalt warm-mix agent, aggregate, mineral powder and rock asphalt; wherein the content of the first and second substances,
the rock asphalt is Buton rock asphalt, and the mixing amount of the rock asphalt is 30-40 percent, preferably 30 percent of the total weight of the matrix asphalt, the asphalt warm-mixing agent and the aggregate; alternatively, the first and second electrodes may be,
the rock asphalt is Qingchuan rock asphalt, and the mixing amount of the rock asphalt is 15-20 percent, preferably 15 percent of the total weight of the matrix asphalt, the asphalt warm-mixing agent and the aggregate.
7. The warm-mix asphalt mixture according to any one of claims 4 to 6, wherein the base asphalt is SK70# base asphalt.
8. The preparation method of the warm-mixed asphalt mixture is characterized by comprising the following preparation steps:
adding an asphalt warm-mixing agent into the matrix asphalt, and stirring at 130-140 ℃ to prepare soft asphalt;
adding the soft asphalt into aggregate at 145-155 ℃ for premixing to prepare premixed material;
adding mineral powder and optionally rock asphalt into the system, and remixing at 135-145 ℃ to prepare the warm-mixed asphalt mixture;
the raw material formula of the warm-mix asphalt mixture is selected from any one of claims 4 to 7.
9. The method for preparing a warm-mix asphalt mixture according to claim 8, comprising the steps of:
adding the asphalt warm-mixing agent into the matrix asphalt, and stirring for 25-35 minutes at the temperature of 130-140 ℃ and the stirring speed of 1000-1100 rpm to prepare the soft asphalt;
heating the aggregate to 145-155 ℃, and stirring for more than 85 seconds;
adding the soft asphalt into the aggregate at 145-155 ℃, and pre-mixing for 55-65 seconds at 145-155 ℃ at a stirring speed of 50-60 rpm to prepare a pre-mixed material;
adding the mineral powder into the system, remixing for 45-55 seconds at 135-145 ℃ at a stirring speed of 50-60 rpm, adding the rock asphalt, remixing for 55-65 seconds at 135-145 ℃ at a stirring speed of 50-60 rpm, and preparing a remixed material;
compacting and molding the remixed material at 125-135 ℃ to obtain the warm-mixed asphalt mixture.
10. The warm-mix asphalt mixture as claimed in any one of claims 1 to 3, or the warm-mix asphalt mixture as claimed in any one of claims 4 to 7, or the warm-mix asphalt mixture prepared by the preparation method as claimed in any one of claims 8 to 9, for road paving.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104556781A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Non-ionic asphalt warm mixing agent and preparation method thereof |
| CN107057385A (en) * | 2017-05-16 | 2017-08-18 | 长安大学 | A kind of asphalt viscosity reduction agent and preparation method thereof and application |
| CN107500611A (en) * | 2017-09-08 | 2017-12-22 | 长安大学 | A kind of waste and old grease premixing enhancing asphalt and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104556781A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Non-ionic asphalt warm mixing agent and preparation method thereof |
| CN107057385A (en) * | 2017-05-16 | 2017-08-18 | 长安大学 | A kind of asphalt viscosity reduction agent and preparation method thereof and application |
| CN107500611A (en) * | 2017-09-08 | 2017-12-22 | 长安大学 | A kind of waste and old grease premixing enhancing asphalt and preparation method thereof |
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