阅读说明：本技术 一种防水高强度玄武岩纤维沥青混合料及其制备方法 (Waterproof high-strength basalt fiber asphalt mixture and preparation method thereof ) 是由 胡剑安 于 2020-08-05 设计创作，主要内容包括：本发明涉及沥青改性材料技术领域,公开了一种防水高强度玄武岩纤维沥青混合料及其制备方法。防水高强度玄武岩纤维沥青混合料包括按重量份计的下述组分：SBS改性沥青4-5份,改性玄武岩纤维0.3-0.5份,集料90-93份,矿粉1-3份；先将SBS改性沥青置于烘加热至熔融；然后将集料和矿粉分别加热烘干至恒重；再将集料和改性玄武岩纤维进行拌合,加入熔融态SBS改性沥青继续拌合,加入矿粉拌合,即得。本发明制备得到的混合料中SBS改性沥青与集料之间、SBS改性沥青与玄武岩纤维之间具有较强的粘结性能,避免雨水对混合料侵蚀造成集料和玄武岩纤维与SBS改性沥青之间出剥离现象,提高提高沥青混合料的防水性能,进而延长沥青混合料的使用寿命。(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.)

1. The waterproof high-strength basalt fiber asphalt mixture is characterized by comprising 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.

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;

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.

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:

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.

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 ℃.

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.