An asphalt concrete material and a method of making the same

Abstract

The application belongs to the technical field of asphalt concrete, and particularly relates to an asphalt concrete material and a preparation method thereof. The asphalt concrete material comprises asphalt, coarse aggregate, fine aggregate, modified basalt fiber, vinyl tributanone oxime-based silane and auxiliary agent. In the modification process of the modified liquid on the basalt fiber, the modified liquid realizes the covering and combination of organic silicon on the surface of the basalt fiber, enhances the wear resistance of the surface, enhances the hydrophobic property, and improves the dispersion stability. Then, the modified liquid is modified by using a modifier, the surface of the basalt fiber is modified by boric acid ester, the binding force between the surface of the particle and the asphalt is improved, good binding property is obtained, and the wear resistance of the road surface is further enhanced.

Description

Technical Field

[0001] This invention belongs to the field of asphalt concrete technology, specifically relating to an asphalt concrete material and its preparation method. Background Technology

[0002] Asphalt concrete, also known as asphalt concrete, is a mixture made by artificially selecting mineral materials with a certain gradation, such as crushed stone or crushed gravel, stone chips or sand, mineral powder, etc., and mixing them with a certain proportion of road asphalt materials under strict control conditions.

[0003] With the development of highway construction, traffic volume has increased rapidly, and the speed of transport per kilometer has also increased quickly. Therefore, under modern high-speed driving conditions, not only are higher requirements placed on the smoothness of the road surface, but also on its wear resistance. Wear resistance is a key performance characteristic of asphalt pavement; insufficient wear resistance poses a direct threat to driving safety. Under repeated vehicle loads, asphalt pavement is constantly worn down, the surface layer undergoes compaction deformation, and the exposed aggregate is gradually worn away by the wheels, thus reducing the pavement's skid resistance. How to improve the friction resistance of asphalt pavement to ensure the safety of high-speed vehicles is an unavoidable problem in the current development of asphalt concrete pavement. Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses an asphalt concrete material and its preparation method. By utilizing the properties of modified basalt fibers, the wear resistance of the asphalt concrete material is effectively improved. Furthermore, the asphalt concrete material of this invention can effectively extend the service life of asphalt pavements.

[0005] Specifically, the first aspect disclosed in this invention is to provide an asphalt concrete material, which comprises the following raw materials in parts by weight:

[0006] 15-20 parts asphalt, 30-45 parts coarse aggregate, 30-35 parts fine aggregate, 3-6 parts modified basalt fiber, 0.6-1.8 parts vinyltributylone oxime silane, and 1-1.3 parts additives.

[0007] In one embodiment, the coarse aggregate comprises gravel.

[0008] In one embodiment, the fine aggregate comprises fine sand.

[0009] In one embodiment, the modified basalt fiber is prepared by:

[0010] (1) Place the basalt fiber in the modified liquid, heat and reflux, spray dry, and collect the dried material;

[0011] (2) The dried material and the modifier were ball-milled to obtain modified basalt fiber.

[0012] In one embodiment, the modified liquid is prepared by mixing 30 parts by weight of toluene, 10 parts by weight of trimethylsilyl alcohol and 12 parts by weight of tetrabutyl titanate.

[0013] In one embodiment, the solid-liquid g / mL ratio of the basalt fiber to the modified liquid is 1:5.

[0014] In one embodiment, the modifier is a mixture of distearyloxyisopropylboronic acid ester and oleic acid diethanolamide borate ester in a mass ratio of 1:1 to 1.5.

[0015] In one embodiment, the mass ratio of the dried material to the modifier is 10:1.

[0016] In one embodiment, the auxiliary agent is polyethylene wax.

[0017] Specifically, a second aspect of this disclosure is to provide a preparation method for preparing asphalt concrete materials, comprising the following steps:

[0018] (1) Heat the asphalt to 160-165℃, add coarse aggregate and fine aggregate, mix, cool to 150-155℃, add modified basalt fiber, and stir;

[0019] (2) After mixing, the temperature is controlled at 150℃, vinyl tributanone oxime silane and additives are added and mixed evenly to obtain asphalt concrete material.

[0020] In this invention, the modification of basalt fibers using a modifying liquid achieves the coating and bonding of organosilicon to the surface of the basalt fibers, enhancing their wear resistance, hydrophobicity, and dispersion stability. Subsequently, modification is carried out using a modifier, specifically borate ester surface modification, which improves the bonding strength between the particle surface and asphalt, resulting in good bonding performance and further enhancing the wear resistance of the road surface.

[0021] The above and other features, aspects and advantages of this application will be more easily understood by referring to the following detailed description. Detailed Implementation Plan

[0022] Unless otherwise specified, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. In case of any discrepancy, the definitions in this specification shall prevail.

[0023] Unless otherwise stated, all percentages, portions, proportions, etc. are by weight.

[0024] The terms “comprising,” “including,” “having,” “containing,” or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but may also include elements not expressly listed or other elements inherent to such composition, process, method, article, or apparatus.

[0025] When quantities, parts by weight, or other numerical values ​​or parameters are given as ranges, preferred ranges, or a series of upper and lower preferred values, it should be understood that it specifically discloses all ranges formed by any pair of values ​​of any larger or preferred range limit and any smaller or preferred range limit, regardless of whether the ranges are disclosed separately. For example, when describing a range of "1 to 5", the described range should be understood to include ranges such as "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. Unless otherwise stated, where numerical ranges are described herein, the range is intended to include the range endpoints as well as all integers, fractions, decimals, etc., within that range.

[0026] Furthermore, the indefinite articles “a” and “an” preceding the elements or components of this disclosure are intended to indicate that there is no limitation on the number of times the said element or component appears (i.e., occurs). Therefore, “a” or “an” should be understood to include one or at least one, and unless the quantity is explicitly stated to be singular, the singular form of the said element or component also includes the plural case.

[0027] An asphalt concrete material comprising the following raw materials in parts by weight:

[0028] 15-20 parts asphalt, 30-45 parts coarse aggregate, 30-35 parts fine aggregate, 3-6 parts modified basalt fiber, 0.6-1.8 parts vinyltributylone oxime silane, and 1-1.3 parts additives.

[0029] Unexpectedly, this disclosure reveals that asphalt pavements paved with the asphalt concrete material of the present invention exhibit good wear resistance and a long service life.

[0030] There are no particular limitations on the coarse aggregate; it can be any of those conventionally used in the art. However, advantageously, the coarse aggregate includes gravel.

[0031] There are no particular limitations on the fine aggregate; it can be any of those conventionally used in the art. However, advantageously, the fine aggregate includes fine sand.

[0032] The present invention also provides a method for preparing modified basalt fibers as follows:

[0033] (1) Place the basalt fiber in the modified liquid, heat and reflux, spray dry, and collect the dried material;

[0034] (2) The dried material and the modifier were ball-milled to obtain modified basalt fiber.

[0035] Unexpectedly, this disclosure reveals that during the modification of basalt fibers using a modifying liquid, the modifying liquid achieves the coating and bonding of organosilicon onto the surface of the basalt fibers, enhancing their surface wear resistance, hydrophobicity, and dispersion stability. Subsequently, by using a modifier and surface modification with borate esters, the bonding strength between the particle surface and asphalt is improved, resulting in good bonding performance and further enhancing the wear resistance of the pavement.

[0036] In this invention, the modified liquid used is prepared by mixing 30 parts by weight of toluene, 10 parts by weight of trimethylsilanol, and 12 parts by weight of tetrabutyl titanate. The organosilicon formed by trimethylsilanol and tetrabutyl titanate is used to coat the surface of basalt fibers, enhancing their performance and improving their overall wear resistance.

[0037] Meanwhile, the solid-liquid g / mL ratio of the basalt fiber to the modified liquid is 1:5.

[0038] In this invention, the modifier used is a mixture of distearate and oleic acid diethanolamide borate in a mass ratio of 1:1 to 1.5. Unexpectedly, this disclosure reveals that the modifier of this invention can effectively improve the surface properties of particles and enhance the bonding strength between particles and asphalt.

[0039] There are no particular limitations on the auxiliary agent mentioned, and it can be any of those conventionally used in the art. However, advantageously, the auxiliary agent is polyethylene wax, which increases performance and improves the surface properties of concrete materials, as well as increasing wear resistance.

[0040] Meanwhile, the addition of vinyltributylone oxime silane in this invention can serve as a crosslinking agent and protect metals, preventing the loss or corrosion of metal substances added to the particles.

[0041] Specifically, a second aspect of this disclosure is to provide a preparation method for preparing asphalt concrete materials, comprising the following steps:

[0042] (1) Heat the asphalt to 160-165℃, add coarse aggregate and fine aggregate, mix, cool to 150-155℃, add modified basalt fiber, and stir;

[0043] (2) After mixing, the temperature is controlled at 150℃, vinyl tributanone oxime silane and additives are added and mixed evenly to obtain asphalt concrete material. Example

[0044] The preparation method of modified basalt fiber is as follows:

[0045] (1) Basalt fiber and modification liquid are mixed at a solid-liquid g / mL ratio of 1:5. The basalt fiber is placed in the modification liquid, heated and refluxed, naturally cooled to room temperature, spray dried, and the dried material is collected.

[0046] (2) The mass ratio of dried material to modifier is 10:1. The dried material and modifier are ball-milled at 900 r / min for 10 min to obtain modified basalt fiber.

[0047] Examples 2 through 4 all used the modified basalt fiber prepared in Example 1. Example

[0048] The coarse aggregate is gravel, commonly used in existing asphalt concrete materials, and the fine aggregate is fine sand, also commonly used in existing asphalt concrete materials. The additive is polyethylene wax.

[0049] An asphalt concrete material comprising the following raw materials in parts by weight:

[0050] 15 parts asphalt, 30 parts coarse aggregate, 30 parts fine aggregate, 3 parts modified basalt fiber, 0.6 parts vinyltributylone oxime silane, and 1 part additive. Example

[0051] The coarse aggregate is gravel, commonly used in existing asphalt concrete materials, and the fine aggregate is fine sand, also commonly used in existing asphalt concrete materials. The additive is polyethylene wax.

[0052] An asphalt concrete material comprising the following raw materials in parts by weight:

[0053] 17 parts asphalt, 33 parts coarse aggregate, 32 parts fine aggregate, 4 parts modified basalt fiber, 0.9 parts vinyltributylone oxime silane, and 1.1 parts additives. Example

[0054] The coarse aggregate is gravel, commonly used in existing asphalt concrete materials, and the fine aggregate is fine sand, also commonly used in existing asphalt concrete materials. The additive is polyethylene wax.

[0055] An asphalt concrete material comprising the following raw materials in parts by weight:

[0056] 18 parts asphalt, 39 parts coarse aggregate, 33 parts fine aggregate, 5 parts modified basalt fiber, 1.2 parts vinyltributylone oxime silane, and 1.2 parts additives. Example

[0057] The coarse aggregate is gravel, commonly used in existing asphalt concrete materials, and the fine aggregate is fine sand, also commonly used in existing asphalt concrete materials. The additive is polyethylene wax.

[0058] An asphalt concrete material comprising the following raw materials in parts by weight:

[0059] 20 parts asphalt, 45 parts coarse aggregate, 35 parts fine aggregate, 6 parts modified basalt fiber, 1.8 parts vinyltributylone oxime silane, and 1.3 parts additives.

[0060] Comparative Example 1

[0061] The coarse aggregate is gravel, commonly used in existing asphalt concrete materials; the fine aggregate is fine sand, also commonly used in existing asphalt concrete materials; and the basalt fiber is basalt fiber, commonly used in existing asphalt concrete materials. The auxiliary agent is polyethylene wax.

[0062] An asphalt concrete material comprising the following raw materials in parts by weight:

[0063] 17 parts asphalt, 33 parts coarse aggregate, 32 parts fine aggregate, 4 parts basalt fiber, 0.9 parts vinyltributylone oxime silane, and 1.1 parts additives.

[0064] Comparative Example 2

[0065] The coarse aggregate is gravel, commonly used in existing asphalt concrete materials, and the fine aggregate is fine sand, also commonly used in existing asphalt concrete materials. The additive is polyethylene wax.

[0066] An asphalt concrete material comprising the following raw materials in parts by weight:

[0067] 17 parts asphalt, 33 parts coarse aggregate, 32 parts fine aggregate, 4 parts modified basalt fiber, and 1.1 parts additives.

[0068] Comparative Example 3

[0069] The coarse aggregate is gravel, commonly used in existing asphalt concrete materials, and the fine aggregate is fine sand, also commonly used in existing asphalt concrete materials. The modified basalt fiber is modified only using a modifying liquid. The auxiliary agent is polyethylene wax.

[0070] An asphalt concrete material comprising the following raw materials in parts by weight:

[0071] 17 parts asphalt, 33 parts coarse aggregate, 32 parts fine aggregate, 4 parts modified basalt fiber, 0.9 parts vinyltributylone oxime silane, and 1.1 parts additives.

[0072] Comparative Example 4

[0073] The coarse aggregate is gravel, commonly used in existing asphalt concrete materials, and the fine aggregate is fine sand, also commonly used in existing asphalt concrete materials. The modified basalt fiber is modified only using a modifier. The auxiliary agent is polyethylene wax.

[0074] An asphalt concrete material comprising the following raw materials in parts by weight:

[0075] 17 parts asphalt, 33 parts coarse aggregate, 32 parts fine aggregate, 4 parts modified basalt fiber, 0.9 parts vinyltributylone oxime silane, and 1.1 parts additives.

[0076] The asphalt concrete materials from Examples 2-5 and Comparative Examples 1-4 were prepared according to the preparation method disclosed in this invention, and the following tests were performed:

[0077] It was tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011);

[0078] Wear resistance testing method: The friction coefficient of test samples 1-8 and control samples 1-3 was measured using a pendulum friction coefficient meter. Measurement points were taken for each sample, and the pendulum value was measured five times. The average of the five readings was taken as the pendulum value at each measurement point. The average of the five pendulum values ​​was then divided by 100 and rounded to two decimal places to obtain the friction coefficient of the road surface. The test results are as follows:

[0079] Fatigue life / cycle Dynamic stability / (cycles / mm) coefficient of friction Example 2 11265 6299 0.83 Example 3 12036 6438 0.95 Example 4 11569 6338 0.89 Example 5 11426 6318 0.86 Comparative Example 1 8469 5136 0.51 Comparative Example 2 10993 6023 0.73 Comparative Example 3 10265 5984 0.63 Comparative Example 4 10189 5867 0.60

[0080] The tests conducted by this invention show that the asphalt concrete material used in this invention has good wear resistance and a long service life.

[0081] Unless otherwise specified, the materials, methods, and examples described herein are exemplary and not limiting. While similar or equivalent methods and materials may be used in implementing or testing this disclosure, suitable methods and materials are also described herein.

Claims

1. An asphalt concrete material, characterized in that, The material comprises the following raw materials in parts by weight: 15-20 parts asphalt, 30-45 parts coarse aggregate, 30-35 parts fine aggregate, 3-6 parts modified basalt fiber, 0.6-1.8 parts vinyltributylone oxime silane, 1-1.3 parts additives; The method for preparing the modified basalt fiber is as follows: (1) Place the basalt fiber in the modified liquid, heat and reflux, spray dry, and collect the dried material; (2) The dried material and the modifier were ball-milled to obtain modified basalt fiber; The modified liquid is prepared by mixing 30 parts toluene, 10 parts trimethylsilanol, and 12 parts tetrabutyl titanate by weight. The modifier is prepared by mixing distearyloxyisopropylboronic acid ester and oleic acid diethanolamide borate ester in a mass ratio of 1:1 to 1.

5.

2. The asphalt concrete material according to claim 1, characterized in that, The coarse aggregate includes gravel.

3. The asphalt concrete material according to claim 1, characterized in that, The fine aggregate includes fine sand.

4. The asphalt concrete material according to claim 1, characterized in that, The solid-liquid g / mL ratio of the basalt fiber to the modified liquid is 1:

5.

5. The asphalt concrete material according to claim 1, characterized in that, The mass ratio of the dried material to the modifier is 10:

1.

6. The asphalt concrete material according to claim 1, characterized in that, The auxiliary agent is polyethylene wax.

7. A preparation method, characterized in that, The method for preparing the asphalt concrete material according to any one of claims 1 to 6 comprises the following steps: (1) Heat the asphalt to 160-165℃, add coarse aggregate and fine aggregate, mix, cool to 150-155℃, add modified basalt fiber, and stir; (2) After mixing, the temperature is controlled at 150℃, vinyl tributanone oxime silane and additives are added and mixed evenly to obtain asphalt concrete material.