CN114772964A - Preparation method of surface modified flocculent basalt fiber for improving adhesion property of asphalt - Google Patents

Preparation method of surface modified flocculent basalt fiber for improving adhesion property of asphalt Download PDF

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CN114772964A
CN114772964A CN202210398875.6A CN202210398875A CN114772964A CN 114772964 A CN114772964 A CN 114772964A CN 202210398875 A CN202210398875 A CN 202210398875A CN 114772964 A CN114772964 A CN 114772964A
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fiber
flocculent
asphalt
basalt
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刘建勋
郭凤宇
马铂程
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Southeast University
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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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/46—Rock wool ; Ceramic or silicate fibres
    • 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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Abstract

The invention discloses a preparation method of surface modified flocculent basalt fiber for improving the adhesion property of asphalt, which comprises the steps of dripping a silane coupling agent into distilled water and stirring for 1 hour; after the silane coupling agent is hydrolyzed, placing the dried flocculent basalt fibers without the wetting agent on the surface into the hydrolyzed silane coupling agent solution, uniformly stirring and wetting for no more than 30 minutes, and then taking out and filtering; drying the filtered flocculent basalt fiber at 105 ℃ to obtain a modified flocculent basalt fiber; the modified flocculent basalt fiber is mixed with the asphalt in a flowing state heated to 175 plus or minus 5 ℃ within the mixing amount range of 2 to 10 mass percent to prepare a uniform fiber asphalt mixture. The invention overcomes the defect of insufficient adhesive force between the asphalt and the existing basalt fiber admixture, increases the adhesive work and the pulling resistance between the fiber and the asphalt, and greatly improves the service life and the deformation resistance of the asphalt pavement.

Description

Preparation method of surface modified flocculent basalt fiber for improving adhesion property of asphalt
Technical Field
The invention relates to a preparation method of a fiber admixture of asphalt, in particular to a preparation method of surface modified flocculent basalt fiber for improving the adhesion property of the asphalt.
Background
Basalt fibers prepared by a traditional wire drawing method have smooth surfaces and chemical inertness on the fiber surfaces, for example, when the basalt fibers are used as reinforcements of resin-based composite materials, the basalt fibers are not well combined with resin, and when the basalt fibers are used as external fibers of asphalt pavements, the basalt fibers are not well adhered to asphalt, so that the prepared composite materials are difficult to fully exert the excellent mechanical properties of the basalt fibers.
In order to widen the application of the basalt fibers in the asphalt, flocculent basalt fibers are prepared by a fiber forming process of a centrifugal method or a blowing method, and the polarity of fiber cotton is reduced by treatment such as dispersion, shearing, granulation and the like. Compared with the fiber forming process by a fiber drawing bushing method, the flocculent fiber obtained by the method has three advantages: firstly, the diameter of the basalt fiber prepared by a high-speed centrifugal method or a blowing method is in a range of 1-9 μm, while the diameter of the continuous basalt fiber prepared by a drawing method is in a range of 13-21 μm, the finer the fiber, the larger the specific surface area of the fiber per unit weight is, and the fiber with smaller diameter is more ideal for thickening the composite material in actual use. Secondly, the production cost of the centrifugal method or the blowing method is much lower than that of the platinum-rhodium alloy bushing plate. Thirdly, the centrifugal or blown-blown fiber forming process has much higher production efficiency per unit yield and lower energy consumption than the wire drawing process, and despite the above advantages, the flocculent basalt fiber prepared by the centrifugal or blown-blown fiber forming process has a surface state that cannot be well combined with the asphalt, and the defect that the basalt fiber produced by the centrifugal or blown-blown method has insufficient adhesive force with the admixture of the basalt fiber is a defect.
In order to solve the defect of insufficient adhesive force between asphalt and the conventional basalt fiber admixture, an invention patent with application number of 201210539838.9 provides a composite material containing modified basalt fiber and a polymer and a preparation method thereof, and discloses a method for dissolving the modified basalt fiber by using a coupling agent solution, and then precipitating and drying to obtain the basalt fiber, but the components of the modifying agent used in the method are complex, wherein the coupling agent is an unnecessary component and can be replaced by other surfactants; in addition, the method does not carry out hydrolysis treatment on the silane coupling agent in advance, all the modifying agents and the fibers are directly stirred together at the same time, and the production method is rough. In addition, the invention patent with the application number of 202110417295.2 provides an asphalt mixture doped with flocculent basalt fibers, and discloses a method for mixing flocculent basalt and asphalt, but the basalt fibers adopted in the method are not modified, and the basalt fibers are finally used in asphalt mixtures such as asphalt, mineral powder, stone and the like, so that the finally prepared mixture is doped with more impurities.
Based on the defects of the prior art, the invention provides the preparation method of the surface modified flocculent basalt fiber for improving the adhesion property of the asphalt, the effect can be achieved only by using a single silane coupling agent and a single modifier, the fiber asphalt mixed mucilage is directly prepared without adding mineral powder and stone materials, the preparation method is low in cost, and the operation method is convenient and fast.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the method for preparing the surface modified flocculent basalt fiber for improving the adhesion property of the asphalt, aiming at the defects of the prior art, the method increases the adhesion function between the fiber and the asphalt, obviously improves the pulling resistance of the prepared fiber asphalt mixture, and greatly improves the service life and the deformation resistance of the asphalt pavement.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of surface modified flocculent basalt fiber for improving the adhesion performance of asphalt comprises the following steps:
step 1, dropwise adding a silane coupling agent into distilled water and stirring for 1 hour, wherein the volume of the added silane coupling agent is 1% of that of the distilled water, and the silane coupling agent is A1100 or A1120 or A1130 silane coupling agent, or any two or three groups of A1100, A1120 and A1130 silane coupling agents;
step 2, after the silane coupling agent is hydrolyzed, placing the dried flocculent basalt fibers without the wetting agent on the surface into the hydrolyzed silane coupling agent solution, uniformly stirring and wetting the flocculent basalt fibers, taking out the flocculent basalt fibers and filtering the flocculent basalt fibers;
step 3, drying the filtered flocculent basalt fiber at 105 ℃ to obtain a modified flocculent basalt fiber;
step 4, mixing the modified flocculent basalt fibers with asphalt heated to 175 +/-5 ℃ in a flowing state to prepare a uniform fiber asphalt mixture, wherein the mass ratio of the modified flocculent basalt fibers in the fiber asphalt mixture is 2-10%;
and 5, carrying out a drawing force test on the fiber asphalt mixture, calculating the surface energy of the fibers and calculating the work of adhesion between the fibers and asphalt.
More preferably, the characteristic functional groups of the A1100 silane coupling agent, the A1120 silane coupling agent and the A1130 silane coupling agent are NH2(CH2)3-、NH2(CH2)2NH(CH2)3-、NH2(CH2CH2NH)2(CH2)3-。
Further preferably, the length L of the flocculent basalt fiber is less than or equal to 6mm, and the diameter D is as follows: d is more than or equal to 1 and less than or equal to 9 mu m; the flocculent basalt fiber is flocculent cotton fiber with the surface showing grey white color, grey green color or light yellow color.
Further preferably, the asphalt is base asphalt or SBS modified asphalt.
Further preferably, the time for stirring to homogeneity and wetting is less than 30 minutes.
Further preferably, the asphalt surface energy test method is a lying drop method, and the test liquid is two or more of water, ethylene glycol, formamide and glycerol.
Further preferably, the modified flocculent fiber surface energy test method is an osmosis method, and the test liquid is two or more of water, ethanol, glycol, acetone, formamide, dodecane and hexadecane.
Further preferably, the fiber surface energy in step 5 is calculated from the dispersion and polar components;
according to the theoretical basis of Fowkes solid surface energy addition, the interfacial tension between solid-liquid contact phases can be expressed as follows:
Figure BDA0003598775090000021
in the formula: gamma rayslDenotes the interfacial tension, γsWhich represents the total surface energy of the fiber,
Figure BDA0003598775090000022
which represents the dispersive component of the fiber,
Figure BDA0003598775090000023
representing the polar component of the fiber; gamma raylWhich is indicative of the surface tension of the test liquid,
Figure BDA0003598775090000024
is representative of the dispersive component of the test liquid,
Figure BDA0003598775090000025
representing the polar component of the test liquid;
and satisfies:
Figure BDA0003598775090000031
Figure BDA0003598775090000032
γs-γsl＝γlcosθ (4)
the following equations (1), (2), (3) and (4) are used:
Figure BDA0003598775090000033
measuring the surface tension gamma of the test liquidlMeasuring the dispersion component of the liquid
Figure BDA0003598775090000034
And testing the polar component of the liquid
Figure BDA0003598775090000035
Numerical value of the dispersion component of the fiber
Figure BDA0003598775090000036
And polar component of the fiber
Figure BDA0003598775090000037
Thereby deriving the surface energy of the fiber.
Further preferably, the work of adhesion between pitch and fiber in step 5 is:
Figure BDA0003598775090000038
after the surface energy of the fibers is calculated, the formula (6) can be substituted to calculate the adhesion work between the asphalt and the fibers.
The invention has the following beneficial effects:
1. the flocculent basalt fiber combined with the asphalt has unique size and shape structure characteristics on the basis of keeping the excellent comprehensive performance of the traditional bunched basalt fiber, so that the flocculent basalt fiber has more excellent mechanical property and thermal stability than wood fiber, and has more excellent oil absorption rate and dispersibility than the traditional bunched basalt fiber; and the flocculent fiber has low cost, the silane coupling agent is easy to obtain, the hydrolysis and fiber modification operation methods are simple and convenient, and the improvement effect is obvious.
2. The invention modifies the flocculent basalt fiber, mixes the modified flocculent basalt fiber with the asphalt in a flowing state to prepare a uniform fiber asphalt mixture, overcomes the defect of insufficient adhesive force between the asphalt and the existing basalt fiber admixture, increases the adhesive work between the fiber and the asphalt, obviously improves the pulling resistance of the fiber asphalt mixture, and greatly improves the service life and the deformation resistance of the asphalt pavement.
Drawings
Fig. 1 is a schematic view of flocculent basalt fibers of the present invention.
Fig. 2 is a schematic diagram of the penetration method for testing the surface energy of flocculent fibers according to the present invention.
FIG. 3-1 is a graph showing the contact angle with pitch for a test liquid of the present invention in the presence of water.
Fig. 3-2 is a graph showing the contact angle test with bitumen when the test liquid of the present invention is formamide.
Fig. 3-3 are contact angle measurements of the asphalt with the test liquid of the present invention being ethylene glycol.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1, the preparation method of the surface-modified flocculent basalt fiber for improving the adhesion property of the asphalt specifically comprises the following steps:
step 1, dropwise adding a silane coupling agent into distilled water and stirring for 1 hour, wherein the volume of the added silane coupling agent is 1% of that of the distilled water, and the silane coupling agent is A1100 or A1120 or A1130 silane coupling agent, or any two or three groups of A1100, A1120 and A1130 silane coupling agents.
The characteristic functional groups of the A1100 silane coupling agent, the A1120 silane coupling agent and the A1130 silane coupling agent are respectively NH2(CH2)3-、NH2(CH2)2NH(CH2)3-、NH2(CH2CH2NH)2(CH2)3The performance of the silane coupling agent containing amino groups is more stable and beneficial to increase through laboratory screeningThe performance of the strong fiber in the asphalt, therefore, the silane coupling agents selected by the invention are all amino silane coupling agents.
And 2, after the silane coupling agent is hydrolyzed, placing the dried flocculent basalt fibers without the wetting agent on the surface into the hydrolyzed silane coupling agent solution, uniformly stirring and wetting, taking out and filtering, wherein the stirring and wetting time is less than 30 minutes.
Because hydroxyl exists on the surface of the fiber, modification of a Silane Coupling Agent (SCA) becomes a preferred method for improving the interface adhesion between the fiber and an organic matter. The silane coupling agent is generally hydrolyzed in water or a water/alcohol mixture in advance, the hydroxyl group replaces the alkoxy group to form silanol and alcohol, and the silanol can form a stable covalent bond with the hydroxyl group on the fiber surface to connect the fiber surface chemical bond with the silane coupling agent. The surface of the flocculent basalt fiber can improve the surface roughness and the adhesion performance after being modified by the coupling agent, is beneficial to the bonding with the asphalt and is beneficial to improving the performance of the asphalt.
The length L of the flocculent basalt fiber adopted by the invention is less than or equal to 6mm, and the diameter D is as follows: d is more than or equal to 1 and less than or equal to 9 mu m; the flocculent basalt fiber is flocculent fiber with the surface showing grey white # FAF0E6 or grey green #32CD32 or light yellow # FFFFE 0.
And 3, drying the filtered flocculent basalt fiber at 105 ℃ to obtain the modified flocculent basalt fiber.
Step 4, mixing the modified flocculent basalt fibers with asphalt heated to 175 +/-5 ℃ in a flowing state to prepare a uniform fiber asphalt mixture; the asphalt is matrix asphalt or SBS modified asphalt, and the mass ratio of the modified flocculent basalt fiber in the fiber asphalt mixture is 2-10%.
And 5, carrying out a drawing force test on the fiber asphalt mixture, calculating the surface energy of the fibers and calculating the work of adhesion between the fibers and asphalt.
The drawing force test is obtained by testing a force measurement ductility instrument; the asphalt surface energy testing method is a drop-laying method, and the testing liquid is two or more of water, glycol, formamide and glycerol; the surface energy test method of the modified flocculent fibers is a penetration method, and the test liquid is two or more of water, ethanol, glycol, acetone, formamide, dodecane and hexadecane.
The free energy of the solid surface can be divided into a dispersion component and a polarity component, which respectively reflect the acting force between different molecular types between contact phases. The fiber surface energy is the difference between the energy of the fiber surface and the energy of the fiber interior, and is an important index for characterizing the wettability of the fiber surface. The overall idea of the surface energy theory is to test a surface contact angle between a sample to be tested and test liquid with specific known chromatic dispersion and polar components, determine the chromatic dispersion and the polar components of the surface energy of the fiber by using the OWRK theory, wherein the surface energy of the fiber is the sum of the chromatic dispersion component and the polar component of the fiber and can be calculated by the chromatic dispersion and the polar component, and the specific steps are as follows:
according to the theoretical basis of Fowkes solid surface energy addition, the interfacial tension between solid-liquid contact phases can be expressed as follows:
Figure BDA0003598775090000051
in the formula: gamma rayslDenotes the interfacial tension, γsWhich represents the total surface energy of the fiber,
Figure BDA0003598775090000052
which is indicative of the dispersive component of the fiber,
Figure BDA0003598775090000053
representing the polar component of the fiber; gamma raylWhich is indicative of the surface tension of the test liquid,
Figure BDA0003598775090000054
is representative of the dispersive component of the test liquid,
Figure BDA0003598775090000055
representing the polar component of the test liquid;
and also satisfies:
Figure BDA0003598775090000056
Figure BDA0003598775090000057
γs-γsl＝γlcosθ (4)
the formula (4) is the young's equation, and the young's equation can be obtained by applying the formulas (1), (2), (3) and (4):
Figure BDA0003598775090000058
determining the surface tension gamma of the test liquidlMeasuring the dispersion component of the liquid
Figure BDA0003598775090000059
And testing the polar component of the liquid
Figure BDA00035987750900000510
Numerical value of the dispersion component of the fiber
Figure BDA00035987750900000511
And polar component of the fiber
Figure BDA00035987750900000512
Thereby deriving the surface energy of the fiber.
The work of adhesion between pitch and fiber is:
Figure BDA00035987750900000513
after the surface energy of the fibers is calculated, the formula (6) can be substituted to calculate the adhesion work between the asphalt and the fibers.
The preparation method of the surface modified flocculent basalt fiber for improving the adhesion performance of the asphalt, which is obtained by the preparation method provided above, can enhance the pulling resistance and the adhesion function between the fiber and the asphalt while improving the service life and the deformation resistance of the asphalt pavement, and the following examples are provided for verifying the superiority of each performance index.
It should be noted that the SBS modified asphalt adopted in the invention is a product number produced by Nanjing national asphalt Limited company: NJGL-GX-D-2022-02-22-108, the product type is Jinling asphalt SBS modified (1-D) SBS modified asphalt, but the asphalt used in the invention is wide in type and is not limited to the above varieties.
Comparative example
Taking part of original unmodified flocculent basalt fibers, putting the original unmodified flocculent basalt fibers in a 105 ℃ oven for drying for 1h, taking out and putting the original unmodified flocculent basalt fibers in a dryer for standby.
The original flocculent basalt fibers and the wood fibers are respectively mixed with SBS modified asphalt heated to 175 +/-5 ℃ in a flowing state according to the mixing amount of 4% by mass to prepare a uniform fiber asphalt mixture.
The tensile force, the fiber surface energy and the adhesion work among the fiber asphalt of the mixture of the flocculent basalt fibers and the wood fibers and the asphalt are respectively tested.
The asphalt surface energy test method is a lying drop method, and the used test liquid is water, glycol and formamide.
The testing method of the surface energy of the flocculent basalt fibers and the wood fibers is a penetration method, the testing liquid used by the flocculent basalt fibers is ethanol, acetone and formamide, and the testing liquid used by the wood fibers is ethanol, acetone and dodecane.
The test results are given in the following table: RQ 0.9985
TABLE 1 original flocculent basalt fiber surface energy test results
Figure BDA0003598775090000061
RQ ═ 0.9918 Table 2 lignocellulosic surface energy test results
Figure BDA0003598775090000062
The adhesion performance data for each fiber reinforcement to asphalt is given in the following table:
TABLE 3 bonding Properties of the coupling agent-modified fibers with SBS-modified asphalt
Figure BDA0003598775090000063
Figure BDA0003598775090000071
Preferred embodiment 1
Slowly dripping 1% volume of A1100 silane coupling agent into distilled water with a fixed volume, stirring for 1h, after the solution is fully hydrolyzed, placing the dried flocculent basalt fiber without wetting agent on the surface into the hydrolyzed silane coupling agent solution, fully and uniformly stirring by a stirrer, wetting for no more than 30 minutes, taking out, filtering, and drying at 105 ℃ to obtain the modified flocculent fiber.
The modified fiber is mixed with SBS modified asphalt which is heated to 175 plus or minus 5 ℃ in a flowing state according to the mixing amount of 2 percent by mass to prepare a uniform fiber asphalt mixture.
The fiber-pitch mixtures were tested for pullout force, fiber surface energy, and work of adhesion between fiber pitches.
The asphalt surface energy test method is a lying drop method, and the used test liquid is water, glycol and formamide.
The fiber surface energy test method is a penetration method, and the used test liquid is ethanol, acetone or formamide.
The test results are given in the following table: RQ ═ 0.9982
TABLE 4A 1100 modified flocculent basalt fiber surface energy test results
Figure BDA0003598775090000072
TABLE 5 surface energy test results for SBS modified asphalt
Figure BDA0003598775090000073
Preferred embodiment 2
Slowly dripping an A1120 silane coupling agent with the volume fraction of 1 percent into distilled water with a fixed volume, stirring for 1 hour, after the solution is fully hydrolyzed, placing the dried flocculent basalt fiber without the wetting agent on the surface into the hydrolyzed silane coupling agent solution, fully and uniformly stirring by a stirrer, wetting for no more than 30 minutes, taking out, filtering, and drying at 105 ℃ to obtain the modified flocculent fiber.
The modified fiber is mixed with SBS modified asphalt heated to 175 plus or minus 5 ℃ in a flowing state by the mass ratio of 4% to prepare a uniform fiber asphalt mixture.
The fiber asphalt mixture was tested for pullout force, asphalt surface energy, and work of adhesion between fiber asphalt.
The asphalt surface energy test method is a lying drop method, and the used test liquid is water, glycol and formamide.
The surface energy test method of the modified flocculent fibers is a penetration method, and the used test liquid is ethanol, acetone or formamide.
The test results are given in the following table: RQ ═ 0.9969
Table 6 a1120 test results of surface energy of modified flocculent basalt fiber
Figure BDA0003598775090000081
Preferred embodiment 3
Slowly dripping A1100 with the volume fraction of 0.5 percent and A1130 silane coupling agent with the volume fraction of 0.5 percent into distilled water with a fixed volume, stirring for 1 hour, after the mixture is fully hydrolyzed, placing the dried flocculent basalt fiber without the wetting agent on the surface into the hydrolyzed silane coupling agent solution, fully and uniformly stirring by a stirrer, soaking for no more than 30 minutes, taking out, filtering, and drying at 105 ℃ to obtain the modified flocculent fiber.
The modified fiber is mixed with SBS modified asphalt heated to 175 plus or minus 5 ℃ in the mass ratio of 6% to prepare a uniform fiber asphalt mixture.
The fiber asphalt mixture was tested for pullout force, asphalt surface energy, and work of adhesion between fiber asphalts.
The asphalt surface energy test method is a lying drop method, and the used test liquid is water, glycol and formamide.
The surface energy test method of the modified flocculent fibers is a penetration method, and the used test liquid is ethanol, acetone and dodecane.
The test results are given in the following table: RQ 0.9949
TABLE 7 surface energy test results of the mixed modified flocculent basalt fibers of A1100 and A1130
Figure BDA0003598775090000082
Example 4
Slowly dripping A1100 with volume fraction of 0.33%, A1120 with volume fraction of 0.33% and A1130 silane coupling agent with volume fraction of 0.33% into distilled water with fixed volume, stirring for 1h, after fully hydrolyzing, placing the dried flocculent basalt fiber without wetting agent on the surface into the hydrolyzed silane coupling agent solution, fully and uniformly stirring by a stirrer and wetting for no more than 30 minutes, taking out and filtering, and drying at 105 ℃ to obtain the modified flocculent fiber.
The modified fiber is mixed with SBS modified asphalt heated to 175 plus or minus 5 ℃ in a flowing state by the mass ratio of 4% to prepare a uniform fiber asphalt mixture.
The fiber asphalt mixture was tested for pullout force, asphalt surface energy, and work of adhesion between fiber asphalts.
The asphalt surface energy test method is a lying drop method, and the used test liquid is water, glycol and formamide.
The surface energy test method of the modified flocculent fibers is a penetration method, and the used test liquid is ethanol, acetone and dodecane.
The test results are given in the following table: RQ ═ 0.9969
TABLE 8 surface energy test results for blended modified flocculent basalt fibers A1100, A1120 and A1130
Figure BDA0003598775090000091
The data are summarized, so that the maximum tensile force borne by the surface modified flocculent basalt fiber reinforced asphalt for improving the adhesion property of the asphalt can be improved by 15 to 25 percent compared with the original ecological fiber reinforced asphalt material and 45 to 70 percent compared with the wood fiber reinforced asphalt material, and the adhesion power between the fibers and the asphalt is improved by about 25 to 40 percent compared with the original ecological fiber reinforced asphalt material and is improved by 30 to 50 percent compared with the wood fiber reinforced asphalt material. The method for testing the surface energy of the fibers and the asphalt in the experiment has the advantages of high precision, good repeatability and reliable result.
In conclusion, the flocculent basalt fiber combined with the asphalt used in the invention has unique size and morphology structure characteristics on the basis of keeping the excellent comprehensive performance of the traditional bunched basalt fiber, so that the flocculent basalt fiber not only has more excellent mechanical property and thermal stability than wood fiber, but also has more excellent oil absorption rate and dispersibility than the traditional bunched basalt fiber; the cost of the flocculent fibers is low, the silane coupling agent is easy to obtain, the operation methods of hydrolysis and fiber modification are simple and convenient, and the improvement effect is obvious; meanwhile, the invention overcomes the defect of insufficient adhesive force between the asphalt and the existing basalt fiber admixture, increases the adhesive work between the fibers and the asphalt, obviously improves the drawing resistance of the finally prepared fiber asphalt mixture, and greatly improves the service life and the deformation resistance of the asphalt pavement.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.

Claims (9)

1. The preparation method of the surface modified flocculent basalt fiber for improving the adhesive property of the asphalt is characterized by comprising the following steps: the method specifically comprises the following steps:
step 1, dropwise adding a silane coupling agent into distilled water and stirring for 1 hour, wherein the volume of the added silane coupling agent is 1% of that of the distilled water, and the silane coupling agent is A1100 or A1120 or A1130 silane coupling agent, or any two or three groups of A1100, A1120 and A1130 silane coupling agents;
step 2, after the silane coupling agent is hydrolyzed, placing the dried flocculent basalt fibers without the wetting agent on the surface into the hydrolyzed silane coupling agent solution, uniformly stirring and wetting the flocculent basalt fibers, taking out the flocculent basalt fibers and filtering the flocculent basalt fibers;
step 3, drying the filtered flocculent basalt fiber at 105 ℃ to obtain a modified flocculent basalt fiber;
step 4, mixing the modified flocculent basalt fibers with asphalt heated to 175 +/-5 ℃ in a flowing state to prepare a uniform fiber asphalt mixture, wherein the mass ratio of the modified flocculent basalt fibers in the fiber asphalt mixture is 2-10%;
and 5, carrying out a drawing force test on the fiber asphalt mixture, calculating the surface energy of the fibers and calculating the work of adhesion between the fibers and asphalt.
2. The method for preparing the surface-modified flocculent basalt fiber for improving the adhesion property of the asphalt according to claim 1, wherein: the characteristic functional groups of the A1100 silane coupling agent, the A1120 silane coupling agent and the A1130 silane coupling agent are respectively NH2(CH2)3-、NH2(CH2)2NH(CH2)3-、NH2(CH2CH2NH)2(CH2)3-。
3. The method for preparing the surface-modified flocculent basalt fiber with improved adhesion property to asphalt according to claim 1, wherein: the length L of the flocculent basalt fiber is less than or equal to 6mm, and the diameter D is as follows: d is more than or equal to 1 and less than or equal to 9 mu m; the flocculent basalt fiber is flocculent fiber with the surface in grey white color, grey green color or light yellow.
4. The method for preparing the surface-modified flocculent basalt fiber for improving the adhesion property of the asphalt according to claim 1, wherein: the asphalt is base asphalt or SBS modified asphalt.
5. The method for preparing the surface-modified flocculent basalt fiber with improved adhesion property to asphalt according to claim 1, wherein: the time for stirring evenly and soaking is less than 30 minutes.
6. The method for preparing the surface-modified flocculent basalt fiber with improved adhesion property to asphalt according to claim 1, wherein: the asphalt surface energy testing method is a lying drop method, and the testing liquid is two or more of water, glycol, formamide and glycerol.
7. The method for preparing the surface-modified flocculent basalt fiber for improving the adhesion property of the asphalt according to claim 6, wherein: the fiber surface energy test method is a penetration method, and the test liquid is two or more of water, ethanol, glycol, acetone, formamide, dodecane and hexadecane.
8. The method for preparing the surface-modified flocculent basalt fiber with improved adhesion property to asphalt according to claim 7, wherein: calculating the fiber surface energy in the step 5 through chromatic dispersion and polar components;
according to the theoretical basis of Fowkes solid surface energy addition, the interfacial tension between solid-liquid contact phases can be expressed as follows:
Figure FDA0003598775080000011
in the formula: gamma rayslDenotes the interfacial tension, γsWhich represents the total surface energy of the fiber,
Figure FDA0003598775080000021
which represents the dispersive component of the fiber,
Figure FDA0003598775080000022
representing the polar component of the fiber; gamma raylWhich is indicative of the surface tension of the test liquid,
Figure FDA0003598775080000023
represents the dispersion component of the test liquid,
Figure FDA0003598775080000024
representing the polar component of the test liquid;
and satisfies:
Figure FDA0003598775080000025
Figure FDA0003598775080000026
γs-γsl＝γicosθ (4)
by using the formulas (1), (2), (3) and (4):
Figure FDA0003598775080000027
determining the surface tension gamma of the test liquidlMeasuring the dispersion component of the liquid
Figure FDA0003598775080000028
And testing the polar component of the liquid
Figure FDA0003598775080000029
Numerical value of the dispersion component of the fiber
Figure FDA00035987750800000210
And poles of fibresComponent of sex
Figure FDA00035987750800000211
Thereby deriving the surface energy of the fiber.
9. The method for preparing the surface-modified flocculent basalt fiber with improved adhesion property to asphalt according to claim 8, wherein: the work of adhesion between the pitch and the fibers in step 5 is:
Figure FDA00035987750800000212
after the surface energy of the fibers is calculated, the formula (6) can be substituted to calculate the adhesion work between the asphalt and the fibers.
CN202210398875.6A 2022-04-15 2022-04-15 Preparation method of surface modified flocculent basalt fiber for improving adhesion property of asphalt Pending CN114772964A (en)

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CN117263573A (en) * 2023-11-17 2023-12-22 河北磊得新型建材科技有限公司 Asphalt concrete and preparation method thereof

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CN113511841A (en) * 2021-04-19 2021-10-19 江苏绿材谷新材料科技发展有限公司 Asphalt mixture doped with flocculent basalt fibers

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