CN111847988A

CN111847988A - Waterproof high-strength basalt fiber asphalt mixture and preparation method thereof

Info

Publication number: CN111847988A
Application number: CN202010779756.6A
Authority: CN
Inventors: 胡剑安
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2020-10-30

Abstract

The invention relates to the technical field of asphalt modified materials, and discloses a waterproof high-strength basalt fiber asphalt mixture and a preparation method thereof. The waterproof high-strength basalt fiber asphalt mixture comprises the following components in parts by weight: 4-5 parts of SBS modified asphalt, 0.3-0.5 part of modified basalt fiber, 90-93 parts of aggregate and 1-3 parts of mineral powder; firstly, heating SBS modified asphalt to be molten; then, respectively heating and drying the aggregate and the mineral powder to constant weight; and mixing the aggregate and the modified basalt fiber, adding the molten SBS modified asphalt, continuously mixing, adding the mineral powder, and mixing. The prepared mixture has stronger adhesive property between SBS modified asphalt and aggregates and between SBS modified asphalt and basalt fibers, avoids the phenomenon that the aggregates, the basalt fibers and the SBS modified asphalt are stripped due to erosion of rainwater to the mixture, improves the waterproof property of the asphalt mixture, and further prolongs the service life of the asphalt mixture.

Description

Waterproof high-strength basalt fiber asphalt mixture and preparation method thereof

Technical Field

The invention relates to the technical field of asphalt modified materials, in particular to a waterproof high-strength basalt fiber asphalt mixture and a preparation method thereof.

Background

With the continuous development of road construction in the world, asphalt is one of the most widely used road pavement materials in the world. As early as in the Babylon Nabola era, asphalt was used for road construction for the first time, but was not passed on until the 19 th century. The road construction of China is rapidly developed in the present year, and the road construction is already a major country of roads in the world, and the highway of China is famous in the world, and along with the rapid development of the country, the requirement on the road construction is continuously improved, and the requirement on the performance of asphalt is higher, so that more modified asphalt is used in the road construction. Bitumen is mainly produced from petroleum and residues after the fractionation of tar and is extracted and processed from natural deposits. The asphalt is composed of hydrocarbon and derivatives, the asphalt mainly comprises carbon atoms and hydrogen atoms, the content of the carbon atoms can reach about 90%, and the rest part is composed of two atoms: heteroatoms and metals. Heteroatoms include nitrogen, oxygen and sulfur; the metal atoms are vanadium, nickel and iron, these atoms being present in trace amounts, usually much less than 1%, and the hydrocarbons constitute the basic structure of the bitumen, the metal atoms providing evidence or characteristics of a source of bitumen oil. Heteroatoms cause the asphalt to develop many unique chemical and physical properties through interaction with molecules. The asphalt pavement has good flatness, an automobile runs stably and comfortably on the pavement, certain plasticity and viscoelasticity are realized, enough vehicle load can be borne, good relaxation performance is also realized, good adhesive force is realized between the asphalt pavement and the automobile tire, high damping and noise reduction effects are realized, and the asphalt pavement can be recycled. But the temperature sensitivity is poor due to the composition and the structure of the asphalt, so that the asphalt pavement is softened at high temperature and hardened at low temperature to crack.

Chinese patent publication No. CN108863172 discloses an open-graded basalt fiber asphalt mixture and a preparation method thereof, wherein the mixture comprises SBS modified asphalt, basalt fiber and mineral aggregate. The basalt fiber is utilized to improve the high-temperature stability, tensile strength and shearing capacity of the asphalt mixture; also, for example, chinese patent publication No. CN107759139 discloses a high fatigue resistance and crack resistance permeable asphalt mixture and a preparation method thereof, the mixture includes SBS modified asphalt, chopped basalt fiber, mineral aggregate, and HVA high binder, and the basalt fiber is used to improve the crack resistance of the mixture. In the patent documents, SBS modified asphalt and added basalt fiber are selected to improve the high and low temperature resistance and the cracking resistance of the asphalt mixture, so that the service life of the asphalt mixture is prolonged. However, the bonding strength between the organic material SBS modified asphalt and the inorganic material aggregate and basalt fiber is poor, the asphalt mixture is easily eroded by rainwater, and further peeling phenomena occur between the asphalt and the aggregate and between the asphalt and the basalt fiber, so that the durability of the pavement is reduced, and the service life of the asphalt mixture is influenced.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a waterproof high-strength basalt fiber asphalt mixture. The prepared mixture has stronger adhesive property between SBS modified asphalt and aggregates and between SBS modified asphalt and basalt fibers, avoids the phenomenon that the aggregates, the basalt fibers and the SBS modified asphalt are stripped due to erosion of rainwater to the mixture, improves the waterproof property of the asphalt mixture, and further prolongs the service life of the asphalt mixture.

The invention also provides a preparation method of the waterproof high-strength basalt fiber asphalt mixture.

In order to achieve the purpose, the invention adopts the following technical scheme: a waterproof high-strength basalt fiber asphalt mixture comprises the following components in parts by weight:

4-5 parts of SBS modified asphalt, 0.3-0.5 part of modified basalt fiber, 90-93 parts of aggregate and 1-3 parts of mineral powder.

Preferably, the aggregate is basalt; the aggregate comprises the following two groups according to particle size: the first group of aggregates is 6-12 mm; the second group of aggregates is 2-5 mm.

Preferably, the mass ratio of the first group of aggregates to the second group of aggregates is 1: 0.2-0.6.

Preferably, the mineral powder is limestone; the particle size of the limestone is less than or equal to 0.075 mm.

Preferably, the preparation method of the SBS modified asphalt comprises the following steps: heating the matrix asphalt to 140-.

Preferably, the preparation method of the modified basalt fiber comprises the following steps:

adding butyl titanate into absolute ethyl alcohol, and uniformly stirring to obtain a solution A for later use; adding glacial acetic acid and deionized water into absolute ethyl alcohol, and uniformly stirring to obtain a solution B for later use; adding dopamine hydrochloride into deionized water, stirring and dissolving, dropwise adding a Tirs-HCl buffer solution and a sodium hydroxide solution to adjust the pH value of a system to 8-9 to obtain a dopamine solution, adding basalt fibers into the dopamine solution, stirring and reacting for 2-5 hours, adding a solution B into a reaction solution after the reaction is finished, stirring and mixing uniformly to obtain a mixed solution, dropwise adding a hydrochloric acid solution to adjust the pH value to 2-3, heating in a water bath to 50-55 ℃, then dropwise adding a solution A into the mixed solution, stirring and reacting for 3-6 hours, standing for 10-15 hours after the reaction is finished, filtering and separating, and placing in an oven for drying treatment to obtain the modified basalt fibers.

Preferably, the mass concentration of the dopamine solution is 1.0-3.5%.

Preferably, the mass ratio of the basalt fibers to the butyl titanate is 1: 0.2-0.5.

The preparation method of the waterproof high-strength basalt fiber asphalt mixture comprises the following steps:

1) the SBS modified asphalt is placed in an oven and heated to be molten at the temperature of 160-170 ℃ to obtain molten SBS modified asphalt;

2) respectively adding the aggregate and the mineral powder into a drying oven, and heating and drying at the temperature of 170-175 ℃ to constant weight;

3) adding the aggregate and the modified basalt fiber into a preheated stirring device for stirring for 30-50s, adding molten SBS modified asphalt into the stirring device, continuously stirring for 1-3min, then adding mineral powder, and stirring for 80-90s to obtain the modified basalt fiber reinforced cement.

Preferably, the preheating temperature of the stirring device in the step 3) is 165-175 ℃.

The invention has the following technical effects:

1. according to the invention, sodium alginate is added in the preparation process of SBS modified asphalt, the sodium alginate is a natural polysaccharide extracted from brown algae plants, the preparation method is green and environment-friendly, and does not cause pollution to the environment, the sodium alginate is a high-viscosity polymer compound, and the sodium alginate is mixed into SBS modified asphalt to remarkably improve the viscosity of SBS modified asphalt, so that the adhesion property between SBS modified asphalt and aggregate or basalt fiber is favorably improved, the stripping phenomenon between SBS modified asphalt and aggregate or basalt fiber caused by water molecules permeating into the asphalt mixture is avoided, and the waterproof property of the asphalt mixture is improved;

2. according to the invention, the basalt fiber is added into the SBS modified asphalt to improve the strength and the anti-cracking performance of the asphalt mixture, and the reinforcing performance of the basalt fiber to the SBS modified asphalt is weakened because the bonding performance between the SBS modified asphalt and the basalt fiber is poor and the SBS modified asphalt and the basalt fiber are easily corroded by rainwater to cause the stripping phenomenon of the SBS modified asphalt and the basalt fiber. On the other hand, on the one hand, the viscosity of the SBS modified asphalt is improved by adding the high-viscosity sodium alginate in the preparation process of the SBS modified asphalt, so that the adhesive property between the SBS modified asphalt and the basalt fiber is improved; on the other hand, the basalt fiber is modified, n-butyl titanate is used as a precursor, nano titanium dioxide colloid is prepared through hydrolytic deposition, nano titanium dioxide colloid particles are deposited and combined on the surface of the basalt fiber, and the surface of the basalt fiber is enabled to present a granular protruding structure, so that the roughness of the surface of the basalt fiber is improved (for example, fig. 1 is a microscopic scanning electron microscope image of the modified basalt fiber, the surface of the modified basalt fiber can be observed to have a protruding structure, and the surface is relatively rough), and an anchoring effect is formed between SBS modified asphalt and the protruding structure on the surface of the basalt fiber, so that the bonding strength between the basalt fiber and SBS modified asphalt is enhanced. However, in the step of preparing and mixing the mixture, under the action of stirring disturbance of materials, the nano titanium dioxide colloid combined on the surface of the basalt fiber is easy to separate from the surface of the basalt fiber, so that the roughness of the surface of the basalt fiber is reduced. In addition, the autoxidation polymerization coating of the polydopamine organic layer on the surface of the basalt fiber can improve the compatibility of the basalt fiber in the asphalt, further improve the bonding strength between the SBS modified asphalt and the basalt fiber, and further improve the reinforcing effect of the basalt fiber on the SBS modified asphalt.

Drawings

FIG. 1 is a microscopic scanning electron microscope image of the modified basalt fiber of the present invention.

Detailed Description

The technical solution of the present invention is further illustrated by the following specific examples. In the present invention, unless otherwise specified, raw materials, equipment, and the like used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.

The matrix asphalt used in the specific embodiment is China petrochemical Jinling petrochemical No. 70, and the main technical parameter indexes are as follows:

sodium alginate used in the specific examples: 100 plus 200mPa.s, the water content is less than or equal to 15.0 percent, the water insoluble substance is less than or equal to 0.6 percent, the viscosity reduction rate is less than or equal to 20 percent, and the product is produced by Shaanxi Chengming Biotechnology Co.

The aggregates used in the specific examples are divided into two groups according to particle size, the first group of aggregates having a particle size of 6-12 mm; the second group of aggregate has the grain diameter of 2-5 mm; the granularity of the mineral powder is less than or equal to 0.075 mm.

Example 1

The waterproof high-strength basalt fiber asphalt mixture comprises the following components in parts by weight:

4.5 parts of SBS modified asphalt, 0.45 part of modified basalt fiber, 91 parts of basalt aggregate and 3 parts of limestone mineral powder; wherein the mass ratio of the first group of aggregates to the second group of aggregates is 1: 0.2.

The preparation method of the SBS modified asphalt comprises the following steps:

heating the matrix asphalt to 145 ℃, adding styrene-butadiene-styrene block copolymer and sodium alginate into the matrix asphalt, wherein the addition amount of the styrene-butadiene-styrene block copolymer is 3.5 wt% of the matrix asphalt, the addition amount of the sodium alginate is 1.0 wt% of the matrix asphalt, continuously heating to 175 ℃, uniformly stirring and mixing at 200r/min, then shearing at a high speed of 4000r/min for 60min, cooling to 155 ℃ after shearing is completed, and stirring and developing at a rotating speed of 600r/min for 1h to obtain the SBS modified asphalt.

The preparation method of the modified basalt fiber comprises the following steps:

adding butyl titanate into absolute ethyl alcohol according to the volume ratio of 1:20, and uniformly stirring to obtain a solution A for later use; adding glacial acetic acid and deionized water into absolute ethyl alcohol, and uniformly stirring, wherein the volume ratio of the glacial acetic acid to the deionized water to the absolute ethyl alcohol is 1:3:8, so as to obtain a solution B for later use; adding dopamine hydrochloride into deionized water, stirring and dissolving, dropwise adding Tirs-HCl buffer solution and sodium hydroxide solution to adjust the pH of the system to 9 to obtain dopamine solution with the mass concentration of 3.0%, adding basalt fibers into the dopamine solution according to the mass-volume ratio of 1g/50mL, stirring for reaction for 4h, adding the solution B into the reaction solution after the reaction is finished, wherein the volume ratio of the dopamine solution to the solution B is 1:2, stirring and mixing uniformly to obtain a mixed solution, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH value to 2, heating in a water bath to 55 ℃, and then dropwise adding the solution A into the mixed solution, wherein the mass ratio of the basalt fiber to the butyl titanate is 1:0.4, stirring for reaction for 5 hours, standing for 13 hours after the reaction is finished, filtering and separating, and drying in an oven at 80 ℃ for 2 hours to obtain the modified basalt fiber.

1) putting the SBS modified asphalt into an oven, heating the oven at 170 ℃ to be molten to obtain molten SBS modified asphalt;

2) respectively adding the aggregate and the mineral powder into an oven, and heating and drying at 170 ℃ until the weight is constant;

3) adding the aggregate and the modified basalt fiber into a stirring device preheated to 175 ℃ for stirring for 30s, adding the molten SBS modified asphalt into the stirring device, continuing stirring for 2min, then adding the mineral powder, and stirring for 85s to obtain the modified basalt fiber reinforced cement.

Example 2

4.5 parts of SBS modified asphalt, 0.4 part of modified basalt fiber, 92 parts of basalt aggregate and 1 part of limestone mineral powder; wherein the mass ratio of the first group of aggregates to the second group of aggregates is 1: 0.6.

heating the matrix asphalt to 140 ℃, adding styrene-butadiene-styrene block copolymer and sodium alginate into the matrix asphalt, wherein the addition amount of the styrene-butadiene-styrene block copolymer is 3.5 wt% of the matrix asphalt, the addition amount of the sodium alginate is 1.0 wt% of the matrix asphalt, continuously heating to 170 ℃, uniformly stirring and mixing at 400r/min, then shearing at a high speed of 5000r/min for 30min, cooling to 155 ℃ after shearing is completed, and stirring and developing at a speed of 500r/min for 3h to obtain the SBS modified asphalt.

adding butyl titanate into absolute ethyl alcohol according to the volume ratio of 1:20, and uniformly stirring to obtain a solution A for later use; adding glacial acetic acid and deionized water into absolute ethyl alcohol, and uniformly stirring, wherein the volume ratio of the glacial acetic acid to the deionized water to the absolute ethyl alcohol is 1:3:8, so as to obtain a solution B for later use; adding dopamine hydrochloride into deionized water, stirring and dissolving, dropwise adding Tirs-HCl buffer solution and sodium hydroxide solution to adjust the pH of the system to 8 to obtain dopamine solution with the mass concentration of 2.0%, adding basalt fibers into the dopamine solution according to the mass-volume ratio of 1g/50mL, stirring for reaction for 3h, adding the solution B into the reaction solution after the reaction is finished, wherein the volume ratio of the dopamine solution to the solution B is 1:2, stirring and mixing uniformly to obtain a mixed solution, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH value to 3, heating in a water bath to 50 ℃, and then dropwise adding the solution A into the mixed solution, wherein the mass ratio of the basalt fiber to the butyl titanate is 1:0.3, stirring and reacting for 4 hours, standing for 12 hours after the reaction is finished, filtering and separating, and drying in an oven at 80 ℃ for 2 hours to obtain the modified basalt fiber.

1) putting the SBS modified asphalt into an oven, heating the SBS modified asphalt in the oven at 160 ℃ until the SBS modified asphalt is molten to obtain molten SBS modified asphalt;

2) respectively adding the aggregate and the mineral powder into an oven, and heating and drying at 175 ℃ until the weight is constant;

3) adding the aggregate and the modified basalt fiber into a stirring device preheated to 165 ℃ for stirring for 50s, adding molten SBS modified asphalt into the stirring device, continuing stirring for 2min, then adding mineral powder, and stirring for 85s to obtain the modified basalt fiber reinforced cement.

Example 3

5 parts of SBS modified asphalt, 0.5 part of modified basalt fiber, 93 parts of basalt aggregate and 2 parts of limestone mineral powder; wherein the mass ratio of the first group of aggregates to the second group of aggregates is 1: 0.3.

heating the matrix asphalt to 143 ℃, adding styrene-butadiene-styrene block copolymer and sodium alginate into the matrix asphalt, wherein the addition amount of the styrene-butadiene-styrene block copolymer is 3.5 wt% of the matrix asphalt, the addition amount of the sodium alginate is 1.0 wt% of the matrix asphalt, continuously heating to 173 ℃, uniformly stirring and mixing at 300r/min, then shearing at a high speed of 4500r/min for 50min, cooling to 160 ℃ after shearing is completed, and stirring and developing at a speed of 550r/min for 2h to obtain the SBS modified asphalt.

adding butyl titanate into absolute ethyl alcohol according to the volume ratio of 1:20, and uniformly stirring to obtain a solution A for later use; adding glacial acetic acid and deionized water into absolute ethyl alcohol, and uniformly stirring, wherein the volume ratio of the glacial acetic acid to the deionized water to the absolute ethyl alcohol is 1:3:8, so as to obtain a solution B for later use; adding dopamine hydrochloride into deionized water, stirring and dissolving, dropwise adding Tirs-HCl buffer solution and sodium hydroxide solution to adjust the pH of the system to 8.5 to obtain dopamine solution with the mass concentration of 3.5%, adding basalt fibers into the dopamine solution according to the mass-volume ratio of 1g/50mL, stirring for reaction for 5h, adding the solution B into the reaction solution after the reaction is finished, wherein the volume ratio of the dopamine solution to the solution B is 1:2, stirring and mixing uniformly to obtain a mixed solution, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH value to 2.5, heating in a water bath to 53 ℃, and then dropwise adding the solution A into the mixed solution, wherein the mass ratio of the basalt fiber to the butyl titanate is 1:0.5, stirring and reacting for 6 hours, standing for 15 hours after the reaction is finished, filtering and separating, and drying in an oven at 80 ℃ for 2 hours to obtain the modified basalt fiber.

1) putting the SBS modified asphalt into an oven, heating the SBS modified asphalt in the oven at 165 ℃ until the SBS modified asphalt is molten to obtain molten SBS modified asphalt;

2) respectively adding the aggregate and the mineral powder into an oven, and heating and drying at 173 ℃ until the weight is constant;

3) adding the aggregate and the modified basalt fiber into a stirring device preheated to 170 ℃ for stirring for 40s, adding molten SBS modified asphalt into the stirring device, continuing stirring for 3min, then adding mineral powder, and stirring for 90s to obtain the modified basalt fiber reinforced cement.

Example 4

4 parts of SBS modified asphalt, 0.3 part of modified basalt fiber, 90 parts of basalt aggregate and 2 parts of limestone mineral powder; wherein the mass ratio of the first group of aggregates to the second group of aggregates is 1: 0.5.

heating the matrix asphalt to 143 ℃, adding styrene-butadiene-styrene block copolymer and sodium alginate into the matrix asphalt, wherein the addition amount of the styrene-butadiene-styrene block copolymer is 3.5 wt% of the matrix asphalt, the addition amount of the sodium alginate is 1.0 wt% of the matrix asphalt, continuously heating to 173 ℃, uniformly stirring and mixing at 300r/min, then shearing at a high speed of 4500r/min for 50min, cooling to 150 ℃ after shearing is completed, and stirring and developing at a rotation speed of 550r/min for 2h to obtain the SBS modified asphalt.

adding butyl titanate into absolute ethyl alcohol according to the volume ratio of 1:20, and uniformly stirring to obtain a solution A for later use; adding glacial acetic acid and deionized water into absolute ethyl alcohol, and uniformly stirring, wherein the volume ratio of the glacial acetic acid to the deionized water to the absolute ethyl alcohol is 1:3:8, so as to obtain a solution B for later use; adding dopamine hydrochloride into deionized water, stirring and dissolving, dropwise adding Tirs-HCl buffer solution and sodium hydroxide solution to adjust the pH of the system to 8.5 to obtain 1.0% dopamine solution, adding basalt fibers into the dopamine solution according to the mass-volume ratio of 1g/50mL, stirring for reaction for 2h, adding the solution B into the reaction solution after the reaction is finished, wherein the volume ratio of the dopamine solution to the solution B is 1:2, stirring and mixing uniformly to obtain a mixed solution, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH value to 2.5, heating in a water bath to 53 ℃, and then dropwise adding the solution A into the mixed solution, wherein the mass ratio of the basalt fiber to the butyl titanate is 1:0.2, stirring for reaction for 3 hours, standing for 10 hours after the reaction is finished, filtering and separating, and drying in an oven at 80 ℃ for 2 hours to obtain the modified basalt fiber.

3) adding the aggregate and the modified basalt fiber into a stirring device preheated to 170 ℃ for stirring for 40s, adding molten SBS modified asphalt into the stirring device, continuing stirring for 1min, then adding mineral powder, and stirring for 80s to obtain the modified basalt fiber reinforced cement.

Comparative example 1:

comparative example 1 differs from example 1 in that the preparation method of SBS modified asphalt comprises the steps of:

heating the matrix asphalt to 145 ℃, adding styrene-butadiene-styrene block copolymer into the matrix asphalt, wherein the addition amount of the styrene-butadiene-styrene block copolymer is 3.5 wt% of the matrix asphalt, continuously heating to 175 ℃, uniformly stirring and mixing at 200r/min, then shearing at a high speed of 4000r/min for 60min, cooling to 155 ℃ after shearing is finished, and stirring and developing at a rotating speed of 600r/min for 1h to obtain the SBS modified asphalt.

Comparative example 2:

comparative example 2 is different from example 1 in that basalt fiber is not subjected to modification treatment.

Comparative example 3:

comparative example 3 is different from example 1 in that dopamine hydrochloride is not added during the preparation of the modified basalt fiber.

1. And (3) testing the water resistance:

immersion marshall test: placing test pieces (the specification of the test pieces is that the diameter is 101.6 +/-0.25 mm, the height is 63.5 +/-0.25 mm) in a constant-temperature water tank with the temperature reached for heat preservation for 35min, keeping intervals among the test pieces, padding the bottom of the test pieces and keeping the distance from the bottom to be not less than 5cm, placing an upper pressure head and a lower pressure head of a Marshall tester in the water tank to reach the same temperature, taking the upper pressure head and the lower pressure head out of the water tank, wiping the inner surfaces of the upper pressure head and the lower pressure head clean, coating a small amount of butter on a guide rod of the lower pressure head in order to enable the upper pressure head and the lower pressure head to slide freely, taking the test pieces out, placing the test pieces on the lower pressure head, covering the upper pressure head, then installing the test pieces on a loading device, starting the loading device to. The residual stability of the test piece in the water immersion Marshall test is calculated according to the following formula:

MS₀＝MS₁(ii)/MS × 100%; wherein, MS₀Indicates the immersion residual stability,%; MS (Mass Spectrometry)₁Shows the stability, KN, of the test piece after being soaked in water for 48 hours; MS indicates the stability, KN, of the test piece.

The test results show that the residual stability of the asphalt mixtures of examples 1 to 4 reaches more than 93 percent, and the asphalt of the invention has excellent water damage resistance. In addition, the stability and the residual stability of the asphalt mixtures in the examples 1 to 4 are higher than those in the comparative example 1, which proves that the sodium alginate can improve the viscosity of the SBS modified asphalt, so that the bonding strength between the SBS modified asphalt and the aggregate is improved, the stripping of the aggregate and the SBS modified asphalt caused by the water molecules entering the asphalt mixtures is avoided, and the water resistance of the asphalt mixtures is improved.

2. Testing the interfacial adhesion of basalt fiber and asphalt cement:

adopting a fiber asphalt drawing tester to test the binding power of basalt fibers and asphalt cement, preparing the asphalt cement according to the mixture ratio, heating the asphalt cement material to 150 ℃ to be in a flowing state, then beginning to pour a sample, pouring half of the asphalt material into a test mold, slowly penetrating the basalt fibers used in the embodiment and the comparative example into gaps at two ends of the test mold, slightly placing the basalt fibers on the upper surface of the asphalt material to keep horizontal, applying fine tension at two ends to straighten the fibers, then slowly pouring the other half of the asphalt material from one end to the other end of the test mold to enable the sample to slightly exceed the sample, standing the sample, cooling to room temperature, scraping the asphalt material with a hot scraper to enable the surface to protrude, respectively embedding and externally arranging the basalt fibers, cutting off the fibers at the non-stretching end at the edge of the test sample, placing the test sample to be tested on a fixed pile to be fixed in a test environment bin, adjusting the position of the clamp through a control panel to enable the clamping end of the clamp to return to a zero position, and then enabling the basalt fiber at the free section at one end of the sample to pass through a small hole of a loading device and be connected with the clamp; covering an organic glass cover, switching on a power supply to start the testing machine, opening a temperature controller until the device is kept at a test temperature for 1h at a constant temperature, starting a drawing test, enabling a clamp connected with basalt fibers to move rightwards along with the drawing testing machine at a constant speed of 10mm/min, applying a tensile force to the basalt fibers until the basalt fibers are completely drawn out, stopping the test, reading a tensile force and a corresponding displacement data change value output by a data acquisition system, and recording the maximum load (N) of the basalt fibers. The larger the maximum load of the basalt fiber is, the better the binding property of the basalt fiber and the asphalt is proved.

As is apparent from comparison of examples 1 to 4 with examples 1 to 3, the basalt fibers prepared in examples 1 to 4 have higher maximum loads than those of comparative examples 1 to 3, demonstrating that the basalt fibers prepared in examples 1 to 4 have higher adhesive strength with asphalt; the bonding strength of the basalt fiber and the asphalt prepared in the embodiment is higher than that of the basalt fiber and the asphalt prepared in the comparative example 1, and the sodium alginate is proved to have the function of tackifying SBS modified asphalt, so that the bonding strength of the basalt fiber and the SBS modified asphalt is improved; the bonding strength of the basalt fiber and the asphalt prepared in the embodiment is higher than that of the basalt fiber and the asphalt prepared in the comparative example 2, and the bonding strength of the basalt fiber and the SBS modified asphalt can be obviously enhanced after the surfaces of the basalt fiber are treated by dopamine and nano titanium dioxide in the embodiment; the bonding strength of the basalt fiber and the asphalt prepared in the embodiment is higher than that of the basalt fiber and the asphalt prepared in the comparative example 3, and the fact that the bonding stability between the nano titanium dioxide and the basalt fiber can be enhanced through the dopamine layer oxidized and polymerized on the surface of the basalt fiber is proved, so that the bonding strength between the basalt fiber and the SBS modified asphalt is improved.

The foregoing is a detailed description of the invention with reference to specific embodiments thereof, which are not to be construed as limiting the invention to the specific embodiments thereof. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. The waterproof high-strength basalt fiber asphalt mixture is characterized by comprising the following components in parts by weight:

2. The waterproof high-strength basalt fiber asphalt mixture according to claim 1, wherein the aggregate is basalt; the aggregate comprises the following two groups according to particle size: the first group of aggregates is 6-12 mm; the second group of aggregates is 2-5 mm.

3. The waterproof high-strength basalt fiber asphalt mixture according to claim 2, wherein the mass ratio of the first group of aggregates to the second group of aggregates is 1: 0.2-0.6.

4. The waterproof high-strength basalt fiber bituminous mixture according to claim 1, wherein the mineral powder is limestone; the particle size of the limestone is less than or equal to 0.075 mm.

5. The waterproof high-strength basalt fiber asphalt mixture according to claim 1, wherein the preparation method of the SBS modified asphalt comprises the following steps: heating the matrix asphalt to 140-.

6. The waterproof high-strength basalt fiber asphalt mixture according to claim 1, wherein the preparation method of the modified basalt fiber comprises the following steps;

7. The waterproof high-strength basalt fiber asphalt mixture according to claim 6, wherein the mass concentration of the dopamine solution is 1.0-3.5%.

8. The waterproof high-strength basalt fiber asphalt mixture according to claim 6, wherein the mass ratio of the basalt fiber to the butyl titanate is 1: 0.2-0.5.

9. A method for preparing a waterproof high-strength basalt fiber asphalt mixture according to any one of claims 1 to 8, comprising the steps of:

10. The method for preparing the waterproof high-strength basalt fiber asphalt mixture according to claim 9, wherein the preheating temperature of the stirring device in the step 3) is 165-175 ℃.