CN113087429A - Interface modifier, and preparation method, application and use method thereof - Google Patents
Interface modifier, and preparation method, application and use method thereof Download PDFInfo
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- CN113087429A CN113087429A CN202110430882.5A CN202110430882A CN113087429A CN 113087429 A CN113087429 A CN 113087429A CN 202110430882 A CN202110430882 A CN 202110430882A CN 113087429 A CN113087429 A CN 113087429A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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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- Ceramic Engineering (AREA)
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Abstract
The invention provides an interface modifier, and a preparation method, application and a use method thereof. The interface modifier comprises the following raw materials in parts by weight: 4-20 parts of iron salt, 800-1200 parts of water and 0.5-1 part of acid. The interface modifier comprises ferric salt, and iron ions are introduced into a bonding interface of asphalt and the acidic aggregate after the acidic aggregate is treated by the interface modifier, so that the stable chemical bond force on the interface can be increased, the interface interaction of the asphalt and the acidic aggregate is improved, and the adhesion grade and the adhesion durability of the asphalt-acidic stone are improved.
Description
Technical Field
The invention relates to the technical field of asphalt pavement materials for road engineering, in particular to an interface modifier, and a preparation method, application and a use method thereof.
Background
Asphalt pavements are widely used in various highways. However, various diseases such as water damage, rutting, loosening and peeling of the road surface are increasingly prominent, wherein the water damage is the most dominant and most harmful damage type. In order to reduce water damage and ensure the adhesion between aggregate and asphalt, high-quality aggregate adopted by asphalt concrete is mainly alkaline aggregate or medium-alkaline stone, including basalt, diabase, limestone and the like, but the resources are limited and non-renewable, the rapid development of asphalt pavement and the large use of aggregate bring great pressure to the exploitation and supply of the aggregate, and also bring great inconvenience to some areas in short supply of the high-quality aggregate. Compared with neutral or alkaline stone, the acid stone has the characteristics of good wear resistance, higher strength and the like, but has low adhesion grade with asphalt, so that the water stability of the mixture is reduced, and the water stability cannot meet the relevant requirements in the specification, thereby greatly limiting the application of the acid stone in highway engineering. In recent years, the situation that the existing high-quality stone resources are completely consumed appears in every place, and the engineering construction is obviously influenced due to the condition that the environment-friendly factor is limited during the exploitation of new resources. Therefore, researches such as improving the adhesiveness of the acidic stone and the asphalt, enhancing the cohesive force and the strength of the asphalt mixture, promoting the application of the acidic aggregate in asphalt pavements and the like are increasingly paid attention by road workers at home and abroad.
How well the aggregate adheres to the asphalt is currently rated by adhesion tests, which are rated according to the road engineering asphalt and asphalt mix test protocol (JTG E20-2011) and the adhesion test of asphalt to coarse aggregate (T0616-1993); the grade of the adhesiveness between the alkaline aggregate and the asphalt can reach 4 or 5, the grade of the adhesiveness between the acidic aggregate such as gneiss and granite is only 1 to 2, and the technical specification of highway asphalt pavement construction (JTG _ F40-2004) requires that the adhesiveness between the aggregate and the asphalt at least reaches 4, so that the acidic aggregate can not reach the standard on the technical index, and the application of the acidic aggregate in the asphalt pavement is greatly restricted.
The addition of additives (e.g., lime, cement and chemical anti-stripping agents) to asphalt mixtures has become a common method, and although these methods have some improvement effects, they still have unsatisfactory engineering applications, such as the liquid anti-stripping agent being gradually dissolved during water immersion to cause the decrease of adhesion, and the long-term anti-aging performance of the polymer modified asphalt being gradually decreased. Therefore, there is a need to develop an interface modifier to improve the adhesion of the asphalt to the acidic aggregate interface. Various methods have long been developed for improving the adhesion of asphalt to aggregate based on environmental factors that improve the asphalt, improve the aggregate surface, and improve the interfacial action. In summary, they can be roughly classified into the following categories: (1) organic anti-stripping agents and modifiers are added into the asphalt, the asphalt is combined with the oleophylic groups, and the hydrophilic groups are combined with the aggregates, so that the adhesion of the asphalt and the aggregates is improved; (2) the surface of the aggregate is treated by lime water, or alkaline substances such as slaked lime, cement and the like are directly used for replacing part of mineral powder in the process of mixing the mixture, so that the acid-alkaline environment is improved, and the adhesion performance of the aggregate to asphalt is improved. Most of the anti-stripping agents on the market are amine compounds derived from higher fatty acids, and some of the anti-stripping agents are added with some solvents. The amine surfactant has the same function as the emulsifier, one end of the amine surfactant is hydrophilic amine, and the other end of the amine surfactant is lipophilic alkyl which is melted in the asphalt, so that the anti-stripping effect is achieved. Although the organic anti-stripping agent can effectively improve the anti-stripping performance and the water stability of the asphalt mixture in a short time, the improvement effect of the aging performance of the mixture is always questioned. A large number of practices prove that the stripping resistance of organic stripping-resistant agents is reduced rapidly after natural aging for a long time. Inorganic minerals such as lime and cement are also commonly used as an additive to increase the adhesion between asphalt and aggregate. It is considered that this method mainly utilizes the alkalinity of inorganic mineral and metal cation provided by it to enhance the adhesion of asphalt to aggregate, and the asphalt contains a small amount of carboxylic acid, so that the asphalt is acidic and easy to adhere to the surface of aggregate, but when it meets water, because water molecules are polar substances, it is easier to replace asphalt to combine with aggregate, so that the asphalt is peeled off from the surface of aggregate, thus causing pavement damage, and it cannot exert anti-stripping effect for a long time.
Based on the defects of the prior anti-stripping agent, modifier or replacement of part of mineral powder by alkaline substances such as slaked lime, cement and the like to improve the adhesion of the aggregate and the asphalt, the improvement is needed.
Disclosure of Invention
In view of the above, the present invention provides an interface modifier, and a preparation method, an application and a use method thereof, so as to solve or partially solve the technical problems in the prior art.
In a first aspect, the invention provides an interface modifier, which comprises the following raw materials in parts by weight: 4-20 parts of iron salt, 800-1200 parts of water and 0.5-1 part of acid.
On the basis of the above technical scheme, preferably, the iron salt comprises ferric trichloride, and the acid comprises hydrochloric acid.
In a second aspect, the present invention also provides a preparation method of the interface modifier, which comprises the following steps:
dissolving ferric salt in water, adding hydrochloric acid, and stirring uniformly to obtain the interface modifier.
In a third aspect, the invention also provides the application of the interface modifier in improving the adhesion of asphalt and acidic aggregate.
In a fourth aspect, the present invention further provides a method for using the interfacial modifier, comprising the following steps:
soaking the acidic aggregate in the interface modifier, taking out and drying;
mixing the dried acidic aggregate with asphalt.
On the basis of the technical scheme, preferably, the use method of the interface modifier comprises the steps of soaking the acidic aggregate in the modifier, taking out the acidic aggregate and drying the acidic aggregate, wherein the drying is natural airing or drying at 100-200 ℃.
On the basis of the technical scheme, preferably, the use method of the interface modifier comprises the step of soaking the acidic aggregate in the interface modifier for not less than 5 min.
Compared with the prior art, the interface modifier has the following beneficial effects:
(1) the interface modifier comprises ferric salt, wherein the acidic aggregate is treated by the interface modifier, and ferric ions are introduced into a bonding interface between asphalt and the acidic aggregate, so that the stable chemical bond force on the interface can be increased, the interface interaction between the asphalt and the acidic aggregate is improved, and the adhesion grade and the adhesion durability of asphalt-acidic stone are improved;
(2) the interface modifier is mixed with asphalt after treating the acidic aggregate, the adhesion grade of the acidic aggregate and the asphalt can be improved to the highest grade, and the adhesion grade between the acidic aggregate and the asphalt can be kept unchanged after being boiled for a long time, so that the interface modifier can form a stable chemical bond on the adhesion interface of the acidic aggregate and the asphalt, the chemical acting force is strong, the corresponding adhesion grade is improved greatly, and the acting time is long; after the interface modifier is used for treating the acidic aggregate, the residual stability and the freeze-thaw cleavage TSR value of the prepared acidic aggregate and asphalt mixture are improved, and the improvement of the adhesion grade of the acidic aggregate and asphalt is proved, so that the short-term water damage resistance of the acidic aggregate and asphalt mixture can be improved; after the interface modifier is used for treating the acidic aggregate, the residual stability and the freeze-thaw cleavage TSR value of the acidic aggregate and the asphalt mixture are greatly improved compared with those of the acidic aggregate and the asphalt mixture which are not treated after the short-term aging and the long-term aging treatment, which shows that the treatment mode improves the aging resistance of the adhesive property of the acidic aggregate and the asphalt mixture, thereby improving the long-term water damage resistance of the asphalt mixture; the results of Marshall tests and rutting tests prove that the modifier and the treatment method can also effectively improve the high-temperature stability of the acidic aggregate and the asphalt mixture.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the application provides an interface modifier, which comprises the following raw materials in parts by weight: 4-20 parts of iron salt, 800-1200 parts of water and 0.5-1 part of acid.
It is to be noted that the iron salt in the present application includes iron trichloride, iron nitrate, iron sulfate, iron phosphate, etc., and the acid includes hydrochloric acid, sulfuric acid, nitric acid, acetic acid, oxalic acid, etc.
In some embodiments, the iron salt is ferric chloride, the acid is hydrochloric acid, and the mass fraction of hydrochloric acid is 20% to 38%.
The principle of the interfacial modifier of the present application is: at a microscopic level, various forces exist at the asphalt-aggregate interface, but these forces play a much different role in the interfacial bonding system. In general the moleculesThe interaction between the two components is greatly contributed by the indirect force, but the physical adsorption caused by Van der Waals force and hydrogen bonds is reversible, and the medium corrosion resistance is poor; although the chemical bond energy is large, the chemical bond forces are insufficient to provide bonding in the asphalt mix due to the small number of chemical bonds at the interface due to the differences in the properties of the asphalt and aggregate materials. The physical and chemical properties of the asphalt and the aggregate are improved, the asphalt reacts on the surface of stone to form chemical bonds so as to form chemical adsorption, and the increase of the chemical bond force on the interface is an effective way for improving the interface effect of the asphalt and the aggregate. In order to increase the chemical bonding force, a substance or a treatment method is needed if a substance or a treatment method can contain a component which can chemically react with the stone surface, the asphalt or generate molecular chain entanglement in the interface modification of the asphalt and the aggregate, and the chemical bonding force on the interface is increased to improve the interaction of the interface and improve various pavement properties of the asphalt mixture. The electron arrangement of the iron element in the iron salt in the present application is 1s2 2s2 2p6 3s2 3p6 3d6 4s2Iron is a variable valence element, is usually divalent and trivalent, and is easy to show positive divalent after losing two 4s electrons to form divalent iron; and losing one more 3d electron becomes 3d5It is a half-full structure, and according to the Hongte rule, it can be known that said structure is relatively stable, and can form trivalent iron, and can also see Fe3+Valence layer electron arrangement of 3d5 4s0With a higher effective positive charge and at the same time Fe3+The ionic radius is also smaller, and the ionic liquid contains 5 d electrons, so that the ionic liquid has stronger positive electric field and empty d orbitals, and provides conditions for forming coordination bonds; in addition to carbon and hydrogen, the asphalt also contains small amounts of sulfur, nitrogen and oxygen, which are generally called heteroatoms, which are small in content and mainly concentrated in the most volatile colloidal and asphaltenic substances with the largest molecular weight, and the majority of the asphalt components are composed of compounds containing heteroatoms, which form polar functional groups in the asphalt. The coordination capacity of the functional groups to iron ions is higher than that of H2Large, carboxylate ion, pyridine in asphaltThe coordination ability of pyrrole, pyridine and other compounds and ferric ions is stronger, and all the compounds can form a complex on an interface to enhance the interface binding power of asphalt and aggregate; in a word, the iron salt is used as the additive in the application, and the treated metal iron ions are introduced to the bonding interface of the asphalt and the acidic aggregate after the treatment of the acidic aggregate, so that the stable chemical bond force on the interface can be increased, the interface interaction of the asphalt and the acidic aggregate is improved, and the adhesion grade and the adhesion durability of the asphalt-acidic stone are improved.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the interface modifier, which comprises the following steps:
dissolving ferric salt in water, adding hydrochloric acid, and stirring uniformly to obtain the interface modifier.
Based on the same inventive concept, the embodiment of the application also provides the application of the interface modifier in improving the adhesion between asphalt and acidic aggregate.
Based on the same inventive concept, the embodiment of the application also provides a using method of the interface modifier, which comprises the following steps:
s1, soaking the acidic aggregate in the interface modifier, taking out and drying;
and S2, mixing the dried acidic aggregate with asphalt.
It should be noted that the acidic aggregate in this application includes gneiss aggregate, granite aggregate, etc.
In some embodiments, the acidic aggregate is soaked in the modifier, and is taken out and dried, wherein the drying is natural airing or drying at 100-200 ℃.
In some embodiments, the acidic aggregate is placed in the interphase modifier for a soaking time of not less than 5 min.
The interface modifier comprises ferric salt, water and acid, is simple and easy to obtain, is easy to manufacture and treat aggregate, and has low cost; from the reaction principle, the interface modifier is used for treating the acidic aggregate and then mixing the acidic aggregate with the asphalt, the adhesion grade of the acidic aggregate and the asphalt can be improved to the highest grade, and the adhesion grade between the acidic aggregate and the asphalt can be kept unchanged after being boiled for a long time, so that the interface modifier can form a stable chemical bond on the adhesion interface of the acidic stone and the asphalt, the chemical acting force is strong, the corresponding adhesion grade is improved greatly, and the acting time is long; after the acidic aggregate is treated by the interface modifier, the residual stability and the freeze-thaw cleavage TSR value of the prepared acidic aggregate and asphalt mixture are improved, and the improvement of the adhesion grade of the acidic aggregate and asphalt is proved, so that the short-term water damage resistance of the acidic aggregate and asphalt mixture can be improved; after the acid aggregate is treated by the interface modifier, the residual stability and the freeze-thaw cleavage TSR value of the acid aggregate and the asphalt mixture are greatly improved compared with those of the acid aggregate and the asphalt mixture which are not treated after short-term aging and long-term aging treatment, which shows that the treatment mode improves the aging resistance of the adhesion property of the acid aggregate and the asphalt mixture, thereby improving the long-term water damage resistance of the asphalt mixture; the results of Marshall test and rutting test prove that the interface modifier and the processing method can also effectively improve the high-temperature stability of the acidic aggregate and the asphalt mixture.
The following further illustrates the method of using the interface modifier of the present application in specific examples and tests the adhesion rating of asphalt to aggregate when acidic aggregate is treated with the interface modifier of the present application and then mixed with asphalt.
The test method of the adhesion grade of the asphalt and the aggregate is as follows:
according to the requirements of the boiling method test procedure in the road engineering asphalt and asphalt mixture test procedure (JTG E20-2011) and the adhesion test of asphalt and coarse aggregate (T0616-1993):
selecting 5 regular aggregates with the particle size of 13.2mm to 19mm and the shape close to a cube, cleaning and drying for later use. The aggregate was tied up with a string in the middle and then immersed in preheated bitumen for 45 seconds. Then the mineral aggregate coated with the asphalt is hung on a test stand, so that the excess asphalt flows off, and the mineral aggregate is cooled for 15min at room temperature. Putting the aggregate particles into water, and soaking and boiling for 3 min. The aggregate was removed from the water and observed for the degree of exfoliation of the bituminous membrane above the mineral aggregate particles and rated for adhesion as per table 1. The rating is as follows:
TABLE 1 asphalt adhesion to aggregate rating
Example 1
The embodiment of the application provides an interface modifier, and the preparation method comprises the following steps: 4 parts by weight of FeCl3The powder was added to 1000 parts of water to dissolve it into FeCl3And adding 1 part of hydrochloric acid into the solution, and uniformly stirring to obtain the interface modifier, wherein the mass fraction of the hydrochloric acid is 25%.
The use method of the interface modifier comprises the following steps:
s1, cleaning the acidic aggregate gneiss, soaking the cleaned acidic aggregate gneiss in the interface modifier for 5min, and drying the immersed acidic aggregate gneiss in a drying box at 105 ℃ for 10 h;
and S2, mixing the dried acidic aggregate sheet gneiss with the asphalt to obtain a mixture.
Specifically, 3 road petroleum asphalts with certain differences in performance are adopted in the examples of the application, and the asphalt performance is shown in table 2.
TABLE 2 road Petroleum asphalt Properties
Respectively soaking acidic aggregate sheet gneiss by using the interface modifier in the example 1, drying, respectively mixing with asphalt 1, asphalt 2 and asphalt 3, and testing the adhesion grade of gneiss aggregate and asphalt according to a standard adhesion test; meanwhile, the acidic aggregate pieces, gneiss and asphalt, were directly mixed (i.e., without the interface modifier soaking treatment in example 1), and the adhesiveness rating of the gneiss aggregate and asphalt was tested according to the standard adhesiveness test, with the results shown in table 3 below.
TABLE 3 adhesion rating of different bitumens to the aggregates
In table 3, after treatment, the acidic aggregate sheet gneiss is soaked by the interface modifier in example 1 and then is dried and mixed with asphalt; untreated refers to mixing the acidic aggregate gneiss directly with the bitumen. From the above table 3, it can be seen that the adhesiveness grade of the acid aggregate sheet gneiss soaked by the interface modifier can reach 5 grade.
Further, directly mixing the acidic aggregate gneiss and the asphalt 1 to prepare an asphalt mixture 1; the acidic aggregate sheet gneiss is soaked in the interface modifier in the example 1 and then dried, and then is mixed with the asphalt 1 to prepare the asphalt mixture 2, and the performances of the asphalt mixture 1 and the asphalt mixture 2 are tested as shown in the following table 4. In table 4, the indexes are standard tests and tested according to technical specification for road asphalt pavement construction (JTG F40-2004).
TABLE 4 Properties of different asphalt mixes
As can be seen from table 4, in the present application, the mixture obtained by soaking the acidic aggregate gneiss in the interface modifier, drying the soaked material, and mixing the soaked material with the asphalt has improved indexes compared with the mixture obtained by directly mixing the gneiss aggregate and the asphalt; the residual stability and the standard freeze-thaw splitting test strength ratio which characterize the short-term water damage resistance of the asphalt mixture are greatly improved compared with the mixture obtained by directly mixing gneiss aggregates and asphalt; the strength ratio of freeze-thaw cycle to 3 times/5 times is increased to represent the water damage resistance of the material when the material is subjected to multiple water damage actions, and compared with a mixture obtained by directly mixing gneiss aggregate and asphalt, the water damage resistance is greatly improved; the freeze-thaw cycle strength ratio of the mixture representing the water damage resistance after short-term aging and long-term aging is also greatly improved compared with the mixture obtained by directly mixing the gneiss aggregate and the asphalt.
And the Marshall flow value, dynamic stability and the like show that the interface modifier can also effectively improve the high-temperature stability of the asphalt mixture.
Example 2
The embodiment of the application provides an interface modifier, and the preparation method comprises the following steps: 10 parts by weight of FeCl3The powder was added to 1000 parts of water to dissolve it into FeCl3And adding 1 part of hydrochloric acid into the solution, and uniformly stirring to obtain the interface modifier, wherein the mass fraction of the hydrochloric acid is 25%.
The use method of the interface modifier comprises the following steps:
s1, cleaning the acidic aggregate gneiss, soaking the cleaned acidic aggregate gneiss in the interface modifier for 5min, and drying the immersed acidic aggregate gneiss in a drying box at 105 ℃ for 10 h;
and S2, mixing the dried acidic aggregate sheet gneiss with the asphalt to obtain a mixture.
Specifically, in the examples of the present application, 70# road common petroleum asphalt was used, and the asphalt properties are shown in table 4.
TABLE 4-70# road Petroleum asphalt Properties
Soaking the acidic aggregate gneiss with the interface modifier in the embodiment 2, drying, and mixing with the 70# road common petroleum asphalt according to the method, and testing the adhesion grade of gneiss aggregate and asphalt; meanwhile, the acidic aggregate gneiss and the 70# road common petroleum asphalt are directly mixed (i.e. the interface modifier soaking treatment in the example 2 is not performed), and the adhesiveness grade of the gneiss aggregate and the asphalt is tested, wherein in the adhesiveness grade test, besides the immersion in water for 3min according to the standard adhesiveness test, the immersion in water is respectively prolonged for 5min, 10min, 15min, 20min and 30min, and the experimental results are shown in the following table 5.
TABLE 5 Effect of different immersion times in water on the adhesion rating between gneiss aggregates and bitumen
In table 5, untreated means that the acidic aggregate sheet gneiss is directly mixed with asphalt, and after treatment, the acidic aggregate sheet gneiss is soaked by using the interface modifier in the method of example 2, dried and then mixed with the asphalt; from the above table 5, it can be seen that the acidic aggregate sheet gneiss obtained by the method of the present invention has high adhesion grade with asphalt and strong boiling resistance after being soaked by the interface modifier of the present invention.
Example 3
The embodiment of the application provides an interface modifier, and the preparation method comprises the following steps: 20 parts by weight of FeCl3The powder was added to 1000 parts of water to dissolve it into FeCl3And adding 0.4 part of hydrochloric acid into the solution, and uniformly stirring to obtain the interface modifier, wherein the mass fraction of the hydrochloric acid is 25%.
The use method of the interface modifier comprises the following steps:
s1, cleaning the acidic aggregate gneiss, soaking the cleaned acidic aggregate gneiss in the interface modifier for 5min, and drying the immersed acidic aggregate gneiss in a drying box at 105 ℃ for 10 h;
and S2, mixing the dried acidic aggregate sheet gneiss with the asphalt to obtain a mixture.
The acid aggregate sheet gneiss is soaked in the interface modifier in the example 3, dried and then mixed with the common petroleum asphalt for the No. 70 road in the example 2, and the adhesion grade between the acid aggregate sheet gneiss and the common petroleum asphalt for the No. 70 road is tested according to a standard adhesion test, so that the adhesion grade is 5 grade.
Example 4
The embodiment of the application provides an interface modifier, and the preparation method comprises the following steps: 4 parts by weight of FeCl3The powder was added to 1000 parts of water to dissolve it into FeCl3And adding 0.5 part of hydrochloric acid into the solution, and uniformly stirring to obtain the interface modifier, wherein the mass fraction of the hydrochloric acid is 25%.
The use method of the interface modifier comprises the following steps:
s1, cleaning acidic aggregate granite, soaking in an interface modifier for 5min, and drying in a drying oven at 105 ℃ for 10 h;
and S2, mixing the dried acidic aggregate granite with asphalt to obtain a mixture.
Soaking the acidic aggregate granite in the interface modifier in the embodiment 4, drying, mixing with the 70# road common petroleum asphalt in the embodiment 2, and testing the adhesion grade between the acidic aggregate granite and the 70# road common petroleum asphalt according to a standard adhesion test, wherein the adhesion grade is 5 grade; and the test adhesion grade is grade 2 after directly mixing the acidic aggregate granite with the 70# road common petroleum asphalt.
Example 5
The embodiment of the application provides an interface modifier, and the preparation method comprises the following steps: 10 parts by weight of FeCl3The powder was added to 1000 parts of water to dissolve it into FeCl3And adding 0.5 part of hydrochloric acid into the solution, and uniformly stirring to obtain the interface modifier, wherein the mass fraction of the hydrochloric acid is 25%.
The use method of the interface modifier comprises the following steps:
s1, cleaning the acidic aggregate granite or the acidic aggregate gneiss, soaking the cleaned acidic aggregate granite or the acidic aggregate gneiss in the interface modifier for 5min, and drying the immersed acidic aggregate granite or the acidic aggregate gneiss in a drying oven at 185 ℃ for 4 h;
and S2, mixing the dried acidic aggregate granite or acidic aggregate gneiss with asphalt to obtain a mixture.
The acid aggregate granite or the acid aggregate gneiss are soaked in the interface modifier in the embodiment 5, dried and mixed with SBS modified asphalt (the asphalt is of a type I-D), and the adhesion grade between the acid aggregate granite or the acid aggregate gneiss and the SBS modified asphalt is tested according to a standard adhesion test; meanwhile, the acidic aggregate granite or the acidic aggregate gneiss are directly mixed with the SBS modified asphalt, and the adhesion grade between the acidic aggregate granite or the acidic aggregate gneiss and the SBS modified asphalt is tested according to a standard adhesion test, and the results are shown in the following table 6.
TABLE 6 adhesion rating of SBS modified asphalt to different aggregates
In table 6, untreated refers to directly mixing acidic aggregate gneiss or acidic aggregate granite with SBS modified asphalt; the treated acidic aggregate gneiss or acidic aggregate granite is soaked in the interface modifier in the embodiment 5, dried and mixed with SBS modified asphalt. As can be seen from table 6, the adhesion grade between the acidic aggregate granite or acidic aggregate granite and the SBS modified asphalt is greatly improved by soaking the acidic aggregate granite or acidic aggregate granite slab gneiss with the interface modifier.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The interface modifier is characterized by comprising the following raw materials in parts by weight: 4-20 parts of iron salt, 800-1200 parts of water and 0.5-1 part of acid.
2. The interphase modifier of claim 1, wherein the iron salt comprises ferric chloride and the acid comprises hydrochloric acid.
3. A method for preparing the interface modifier of claim 1 or 2, comprising the steps of:
dissolving ferric salt in water, adding hydrochloric acid, and stirring uniformly to obtain the interface modifier.
4. Use of an interphase modifier according to claim 1 or 2 for improving the adhesion of bitumen to acidic aggregates.
5. The use method of the interface modifier is characterized by comprising the following steps:
soaking acidic aggregate in the interface modifier according to claim 1 or 2, taking out and drying;
mixing the dried acidic aggregate with asphalt.
6. The use method of the interface modifier according to claim 5, wherein the acidic aggregate is soaked in the modifier, taken out and dried, wherein the drying is natural airing or drying at 100-200 ℃.
7. The method of using the interface modifier according to claim 5, wherein the acidic aggregate is soaked in the interface modifier for not less than 5 min.
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| CN1142484A (en) * | 1995-08-10 | 1997-02-12 | 交通部重庆公路科学研究所 | Petroleum asphalt anti-releasing agent |
| CN101560072A (en) * | 2009-06-02 | 2009-10-21 | 天津市市政工程研究院 | Treatment method for strengthening surface adhesiveness of granite or limestone aggregates |
| CN103030320A (en) * | 2012-09-26 | 2013-04-10 | 天津市市政工程研究院 | Anti-stripping agent for improving asphalt and stone adhesiveness and preparation method thereof |
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