High-strength asphalt concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and provides high-strength asphalt concrete and a preparation method thereof. The high-strength asphalt concrete is prepared from the following raw material components in parts by weight: 5 to 10 parts of asphalt, 75 to 85 parts of gravel, 15 to 20 parts of sand, 14 to 20 parts of mineral powder and 6 to 10 parts of filler, the filling material comprises zirconium oxide fibers and polyethylene glycol terephthalate fibers. According to the technical scheme, the problem of poor compressive strength of the high-strength asphalt concrete in related technologies is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, and in particular to a high-strength asphalt concrete and a preparation method thereof. Background Art

[0002] In the construction of modern transportation infrastructure, asphalt concrete is a key material for road paving, and its performance directly affects the service life and driving safety of the road. Although traditional asphalt concrete has met the needs under conventional traffic conditions to a certain extent, with the continuous growth of traffic volume and the increasing number of heavy vehicles, more stringent requirements are placed on the compressive strength of pavement materials.

[0003] The existing ordinary asphalt concrete has insufficient compressive strength when facing heavy traffic, which can lead to phenomena such as rutting and cracks. The formation of rutting will not only reduce the flatness of the road surface and affect driving comfort, but may also cause safety hazards; cracks will further accelerate the damage to the road surface, shorten the road maintenance cycle, and increase maintenance costs. On some busy freight channels, due to long-term repeated rolling by heavy trucks, the road surface has obvious rutting and cracks in a short period of time, seriously affecting the normal use of the road. In addition, in some special engineering fields, such as airport runways, port terminals, etc., the compressive strength requirements of pavement materials are more prominent. Airport runways need to withstand the huge impact force of aircraft takeoff and landing, and port terminals have to deal with the frequent heavy loading and unloading equipment. Existing asphalt concrete is difficult to meet these high-intensity usage requirements.

[0004] In summary, the development of an asphalt concrete with high compressive strength is of vital importance to the concrete field. It is not only beneficial to extend the service life of roads, but also reduces maintenance costs, improves driving safety, and expands the application scenarios of asphalt concrete. Summary of the invention

[0005] The present invention provides a high-strength asphalt concrete and a preparation method thereof, which solves the problem of poor compressive strength of the high-strength asphalt concrete in the related art.

[0006] The technical solution of the present invention is as follows: The present invention provides a high-strength asphalt concrete, the raw materials of which include the following components in parts by weight: 5-10 parts of asphalt, 75-85 parts of crushed stone, 15-20 parts of sand, 14-20 parts of mineral powder, and 6-10 parts of filler; The filler includes zirconium oxide fiber and polyethylene terephthalate fiber.

[0007] As a further technical solution, the crushed stone is dolomite with a porosity of 43%.

[0008] As a further technical solution, the sand is river sand with a fineness modulus of 2.2.

[0009] As a further technical solution, the mineral powder is S95 grade mineral powder.

[0010] As a further technical solution, the mass ratio of zirconium oxide fiber to polyethylene terephthalate fiber is 5~7:1.

[0011] In the present invention, the compressive strength of the high-strength asphalt concrete is further improved by adjusting the mass ratio of the zirconium oxide fiber to the polyethylene terephthalate fiber to 5-7:1.

[0012] As a further technical solution, the zirconia fiber is a composite zirconia fiber.

[0013] As a further technical solution, the raw materials of the composite zirconia fiber include zirconia fiber and benzhydrylamine.

[0014] In the present invention, composite zirconia fibers are used instead of zirconia fibers, thereby improving the waterproofness of high-strength asphalt concrete.

[0015] As a further technical solution, the preparation method of the composite zirconia fiber comprises the following steps: Zirconia fiber and benzhydrylamine are added into ethanol, stirred and concentrated to obtain composite zirconia fiber.

[0016] As a further technical solution, the mass ratio of the zirconium oxide fiber to dibenzhydrylamine is 20-25:1.

[0017] In the present invention, the water resistance of high-strength asphalt concrete is further improved by adjusting the mass ratio of zirconium oxide fiber to dibenzhydrylamine to 20-25:1.

[0018] As a further technical solution, the mass volume ratio of the zirconium oxide fiber to ethanol is 1 g:2~3 mL.

[0019] As a further technical solution, the stirring speed is 65-75 rpm, the stirring time is 2.5-3.5 h, and the stirring temperature is 40-50° C.

[0020] The present invention also proposes a method for preparing the high-strength asphalt concrete, comprising the following steps: S1, first mixing zirconium oxide fiber and polyethylene terephthalate fiber until uniform to obtain a filler; S2, mixing the crushed stone, sand, mineral powder and the filler material until they are uniform, to obtain dry material; S3, heat-treating the asphalt, and mixing it with the dry material for the third time until it is uniform, so as to obtain high-strength asphalt concrete.

[0021] As a further technical solution, the heat treatment is heating to 150-170°C; During the third mixing, the temperature is 160-175°C.

[0022] The working principle and beneficial effects of the present invention are: In the present invention, asphalt binds the remaining components together to form an overall structure of asphalt concrete, crushed stone serves as a skeleton material to form a supporting structure in the asphalt concrete, and sand and mineral powder are filled in the gaps of the crushed stone to reduce the porosity of the asphalt concrete. Zirconia fiber and polyethylene terephthalate fiber are added as fillers in the present invention to fill the tiny gaps in the asphalt concrete, and the high interface strength between the two fibers and the asphalt helps to better transfer and disperse stress, and the zirconia fiber and the polyethylene terephthalate fiber produce a synergistic effect to improve the compressive strength of the asphalt concrete. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the following embodiments and comparative examples, asphalt was purchased from Nanchang Hongdun Waterproof Materials Co., Ltd. with the item number JHD-231, zirconium oxide fiber was purchased from Lingshou Linda Mineral Products Processing Plant with the item number 52811, polyethylene terephthalate fiber model was FR530 NC, with a dibenzhydrylamine content of 99wt%, nylon fiber model was A3HG5, lignin fiber was purchased from Hebei Chaoyan New Materials Technology Co., Ltd. with the item number 4894-8, and titanium oxide fiber was purchased from Shandong Sitaili Metal Materials Co., Ltd. with the item number WM01002019508431.

[0025] Example 1 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 10 parts of asphalt, 85 parts of crushed stone, 20 parts of sand, 20 parts of mineral powder, and 10 parts of filler; The filler includes zirconium oxide fiber and polyethylene terephthalate fiber in a mass ratio of 10:1; The preparation method of high-strength asphalt concrete comprises the following steps: S1, mixing zirconium oxide fiber and polyethylene terephthalate fiber until uniform to obtain a filler; S2, mixing crushed stone, sand, mineral powder and filler until uniform to obtain dry material; S3. Heat the asphalt to 170°C and mix it with dry materials at 175°C until uniform to obtain high-strength asphalt concrete.

[0026] Example 2 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 5 parts of asphalt, 75 parts of crushed stone, 15 parts of sand, 14 parts of mineral powder, and 6 parts of filler; The filler includes zirconium oxide fiber and polyethylene terephthalate fiber in a mass ratio of 2:1; The preparation method of high-strength asphalt concrete comprises the following steps: S1, mixing zirconium oxide fiber and polyethylene terephthalate fiber until uniform to obtain a filler; S2, mixing crushed stone, sand, mineral powder and filler until uniform to obtain dry material; S3. Heat the asphalt to 150°C and mix it with dry materials at 160°C until uniform to obtain high-strength asphalt concrete.

[0027] Example 3 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 8 parts of asphalt, 80 parts of crushed stone, 18 parts of sand, 18 parts of mineral powder, and 8 parts of filler; The filler includes zirconium oxide fiber and polyethylene terephthalate fiber in a mass ratio of 8:1; The preparation method of high-strength asphalt concrete comprises the following steps: S1, mixing zirconium oxide fiber and polyethylene terephthalate fiber until uniform to obtain a filler; S2, first mixing the crushed stone, sand, mineral powder and filler until uniform to obtain dry material; S3. Heat the asphalt to 160°C and mix it with dry materials at 170°C until uniform to obtain high-strength asphalt concrete.

[0028] Example 4 The only difference between this embodiment and embodiment 3 is that the filler in this embodiment includes zirconium oxide fibers and polyethylene terephthalate fibers in a mass ratio of 4:1.

[0029] Example 5 The only difference between this embodiment and embodiment 3 is that the filler in this embodiment includes zirconium oxide fibers and polyethylene terephthalate fibers in a mass ratio of 5:1.

[0030] Example 6 The only difference between this embodiment and embodiment 3 is that the filler in this embodiment includes zirconium oxide fibers and polyethylene terephthalate fibers in a mass ratio of 7:1.

[0031] Example 7 The only difference between this embodiment and embodiment 6 is that the zirconia fiber in this embodiment is replaced by composite zirconia fiber; The raw materials of the composite zirconia fiber include zirconia fiber and dibenzhydrylamine in a mass ratio of 30:1; The preparation method of composite zirconia fiber comprises the following steps: Adding zirconium oxide fiber and dibenzhydrylamine into ethanol, stirring at 50° C., and concentrating to obtain composite zirconium oxide fiber; The mass volume ratio of zirconia fiber to ethanol was 1 g:3 mL; The stirring speed was 75 rpm and the stirring time was 2.5 h.

[0032] Example 8 The only difference between this embodiment and embodiment 7 is that the raw materials of the composite zirconia fiber of this embodiment include zirconia fiber and dibenzhydrylamine in a mass ratio of 15:1.

[0033] Example 9 The only difference between this embodiment and embodiment 7 is that the raw materials of the composite zirconia fiber of this embodiment include zirconia fiber and dibenzhydrylamine in a mass ratio of 20:1.

[0034] Example 10 The only difference between this embodiment and embodiment 7 is that the raw materials of the composite zirconia fiber of this embodiment include zirconia fiber and dibenzhydrylamine in a mass ratio of 25:1.

[0035] Embodiment 11 The only difference between this embodiment and embodiment 6 is that the zirconia fiber in this embodiment is replaced by composite zirconia fiber; The raw materials of the composite zirconia fiber include zirconia fiber and dibenzhydrylamine in a mass ratio of 30:1; The preparation method of composite zirconia fiber comprises the following steps: Adding zirconium oxide fiber and benzhydrylamine into ethanol, stirring at 40° C., and concentrating to obtain composite zirconium oxide fiber; The mass volume ratio of zirconia fiber to ethanol was 1 g:2 mL; The stirring speed was 65 rpm and the stirring time was 3.5 h.

[0036] Comparative Example 1 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 8 parts of asphalt, 80 parts of crushed stone, 18 parts of sand, 18 parts of mineral powder, and 8 parts of filler; The filler is zirconia fiber; The preparation method of high-strength asphalt concrete comprises the following steps: S1. Mix crushed stone, sand, mineral powder and zirconium oxide fiber until uniform to obtain dry material; S2. Heat the asphalt to 160°C and mix it with dry materials at 170°C until uniform to obtain high-strength asphalt concrete.

[0037] Comparative Example 2 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 8 parts of asphalt, 80 parts of crushed stone, 18 parts of sand, 18 parts of mineral powder, and 8 parts of filler; The filling material is polyethylene terephthalate fiber; The preparation method of high-strength asphalt concrete comprises the following steps: S1, mixing crushed stone, sand, mineral powder and polyethylene terephthalate fiber until uniform to obtain dry material; S2. Heat the asphalt to 160°C and mix it with dry materials at 170°C until uniform to obtain high-strength asphalt concrete.

[0038] Comparative Example 3 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 8 parts of asphalt, 80 parts of crushed stone, 18 parts of sand, and 18 parts of mineral powder; The preparation method of high-strength asphalt concrete comprises the following steps: S1. Mix crushed stone, sand and mineral powder until uniform to obtain dry material; S2. Heat the asphalt to 160°C and mix it with dry materials at 170°C until uniform to obtain high-strength asphalt concrete.

[0039] Comparative Example 4 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 8 parts of asphalt, 80 parts of crushed stone, 18 parts of sand, 18 parts of mineral powder, and 8 parts of filler; The filler includes zirconia fiber and nylon fiber in a mass ratio of 8:1; The preparation method of high-strength asphalt concrete comprises the following steps: S1. Mixing zirconium oxide fiber and nylon fiber until uniform to obtain a filler; S2, mixing crushed stone, sand, mineral powder and filler until uniform to obtain dry material; S3. Heat the asphalt to 160°C and mix it with dry materials at 170°C until uniform to obtain high-strength asphalt concrete.

[0040] Comparative Example 5 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 8 parts of asphalt, 80 parts of crushed stone, 18 parts of sand, 18 parts of mineral powder, and 8 parts of filler; The filler includes zirconium oxide fiber and lignin fiber in a mass ratio of 8:1; The preparation method of high-strength asphalt concrete comprises the following steps: S1, mixing zirconium oxide fiber and lignin fiber until uniform to obtain a filler; S2, mixing crushed stone, sand, mineral powder and filler until uniform to obtain dry material; S3. Heat the asphalt to 160°C and mix it with dry materials at 170°C until uniform to obtain high-strength asphalt concrete.

[0041] Comparative Example 6 A high-strength asphalt concrete, the raw materials include the following components in parts by weight: 8 parts of asphalt, 80 parts of crushed stone, 18 parts of sand, 18 parts of mineral powder, and 8 parts of filler; The filler includes titanium oxide fiber and polyethylene terephthalate fiber in a mass ratio of 8:1; The preparation method of high-strength asphalt concrete comprises the following steps: S1, mixing titanium oxide fiber and lignin fiber until uniform to obtain a filler; S2, mixing crushed stone, sand, mineral powder and filler until uniform to obtain dry material; S3. Heat the asphalt to 160°C and mix it with dry materials at 170°C until uniform to obtain high-strength asphalt concrete.

[0042] Experimental Example 1 The high-strength asphalt concretes prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were tested for compressive strength according to ASTM D 1074-2002 "Test Method for Compressive Strength of Asphalt Mixtures". The test results are shown in Table 1.

[0043]

[0044] Comparing Examples 3 to 6 with the comparative example, it is shown that the zirconium oxide fiber and the polyethylene terephthalate fiber are used together as fillers in the present invention, and the zirconium oxide fiber and the polyethylene terephthalate fiber act synergistically to improve the compressive strength of the high-strength asphalt concrete.

[0045] Experimental Example 2 The water absorption rate of the high-strength asphalt concrete prepared in Examples 6 to 11 was tested according to the method specified in JTG E20-2011 "Test Procedure for Asphalt and Asphalt Mixtures for Highway Engineering". The test results are shown in Table 2.

[0046]

[0047] Comparing Examples 7 to 11 with Example 6, it is shown that the use of composite zirconia fibers made of zirconia fibers and dibenzhydrylamine instead of zirconia fibers in the present invention improves the waterproofness of high-strength asphalt concrete.

[0048] Experimental Example 3 The high-strength asphalt concrete prepared in Examples 6 and 7 was tested for rutting dynamic stability according to the test method in JTG E20-2011 "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The test results are shown in Table 3.

[0049]

[0050] Comparing Example 7 with Example 6, it is shown that the composite zirconia fiber made of zirconia fiber and dibenzhydrylamine is used instead of zirconia fiber in the present invention to improve the rutting dynamic stability of high-strength asphalt concrete.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength asphalt concrete, characterized in that: The raw materials include the following components by weight: 5-10 parts of asphalt, 75-85 parts of crushed stone, 15-20 parts of sand, 14-20 parts of mineral powder, and 6-10 parts of filler; The filler includes zirconium oxide fiber and polyethylene terephthalate fiber.

2. The high-strength asphalt concrete according to claim 1, characterized in that: The mass ratio of zirconia fiber to polyethylene terephthalate fiber is 5~7:

1.

3. The high-strength asphalt concrete according to claim 1, characterized in that: The zirconia fiber is a composite zirconia fiber.

4. The high-strength asphalt concrete according to claim 3, characterized in that: The raw materials of the composite zirconia fiber include zirconia fiber and benzhydrylamine.

5. The high-strength asphalt concrete according to claim 4, characterized in that: The preparation method of the composite zirconia fiber comprises the following steps: Zirconia fiber and benzhydrylamine are added into ethanol, stirred and concentrated to obtain composite zirconia fiber.

6. The high-strength asphalt concrete according to claim 5, characterized in that: The mass ratio of the zirconium oxide fiber to dibenzhydrylamine is 20-25:

1.

7. The high-strength asphalt concrete according to claim 5, characterized in that: The mass volume ratio of the zirconium oxide fiber to ethanol is 1 g:2-3 mL.

8. The high-strength asphalt concrete according to claim 5, characterized in that: The stirring speed is 65-75 rpm, the stirring time is 2.5-3.5 h, and the stirring temperature is 40-50° C.

9. The method for preparing high-strength asphalt concrete according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, first mixing zirconium oxide fiber and polyethylene terephthalate fiber until uniform to obtain a filler; S2, mixing the crushed stone, sand, mineral powder and the filler material until they are uniform, to obtain dry material; S3, heat-treating the asphalt, and mixing it with the dry material for the third time until it is uniform, so as to obtain high-strength asphalt concrete.

10. The method for preparing high-strength asphalt concrete according to claim 9, characterized in that: The heat treatment is heating to 150-170°C; During the third mixing, the temperature is 160-175°C.

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