Hot-pressed asphalt waterproof binding material and application thereof

Abstract

The invention belongs to the technical field of waterproof binding materials, and provides a hot-pressed asphalt waterproof binding material and application thereof. The hot-pressed asphalt waterproof binding material comprises a waterproof binding material and a hot-pressed asphalt mixture, the hot-pressed asphalt mixture comprises modified asphalt, coarse aggregate, fine aggregate and mineral powder, the coarse aggregate is limestone and steel slag, and the fine aggregate is one or more of machine-made sand, basalt and diabase; the waterproof binding material comprises a rubber emulsion, acrylic resin, epoxy modified asphalt and repairing balls in a mass ratio of (3-5): (1-3): (8-12): (1-2). According to the invention, various raw materials of the hot-pressed asphalt mixture and various raw materials of the waterproof binding material are reasonably selected, and proportions and particle sizes of the various raw materials are controlled, so that properties such as dynamic stability, low-temperature bending failure strain, freeze-thaw splitting residual strength ratio, immersion Marshall residual stability, water stability and the like of a track test are remarkably improved; and the service life of the pavement is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof binders, and particularly relates to a hot-pressed asphalt waterproof binder material and its application. Background Art

[0002] The bridge deck pavement system successively includes a lower bearing layer bridge deck, a waterproof bonding layer, and an upper layer asphalt mixture pavement layer from top to bottom. The bridge deck pavement is an important part of the bridge structure. The quality of the pavement layer directly affects driving safety, comfort, durability, as well as economic and social benefits. Among them, the waterproof bonding layer has the function of connecting the upper and lower structural layers to form an integral structure, ensuring good stability between the cement concrete panel and the pavement layer, and having main functions such as adhesion, waterproofing, and stress absorption. In addition, it should also have good stability and durability, playing a crucial role in the safety of the entire bridge-tunnel structure and the road surface. There are many types of waterproof bonding materials, and the commonly used ones are waterborne epoxy emulsified asphalt-based waterproof bonding materials. Its advantages are that the adhesion and waterproofness are improved, but the disadvantages are high brittleness, weak impact resistance, insufficient durability, and high cost, which greatly limits the application of waterborne epoxy emulsified asphalt-based waterproof bonding materials.

[0003] The embedded layer of the hot-pressed asphalt mixture is dense and almost impermeable, having excellent water damage resistance and freeze-thaw resistance; the evenly sized pre-mixed asphalt gravel scattered on the surface has a large embedding depth and good anti-skid performance, which can significantly improve transportation safety.

[0004] Therefore, it is of great significance to provide a hot-pressed asphalt waterproof binder material with good road performance, while improving the low-temperature bending failure strain performance, freeze-thaw splitting residual strength ratio, water stability, and dynamic stability. Summary of the Invention

[0005] The purpose of the present invention is to provide a hot-pressed asphalt waterproof binder material and its application in view of the deficiencies of the prior art.

[0006] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0007] The present invention provides a hot-pressed asphalt waterproof binder material, which comprises a waterproof binder material and a hot-pressed asphalt mixture;

[0008] The hot-pressed asphalt mixture comprises modified asphalt, coarse aggregate, fine aggregate, and mineral powder; the coarse aggregate is limestone and steel slag, and the fine aggregate is one or several of machine-made sand, basalt, and diabase;

[0009] The waterproof bonding material comprises a rubber emulsion, an acrylic resin, an epoxy modified asphalt and repair balls; the mass ratio of the rubber emulsion, the acrylic resin, the epoxy modified asphalt and the repair balls is 3-5:1-3:8-12:1-2.

[0010] Preferably, the particle size of the coarse aggregate is 2.36-19 mm, wherein the mass ratio of the coarse aggregate with a particle size of 2.36-4.75 mm, the coarse aggregate with a particle size of 4.75-9.5 mm and the coarse aggregate with a particle size of 9.5-19 mm is 1-3:1-3:1-2.

[0011] Preferably, the particle size of the fine aggregate is ≤2.36 mm; the particle size of the mineral powder is ≤0.6 mm.

[0012] Preferably, the modified asphalt is composed of coal liquefaction residue and SBS modified asphalt, and the mass ratio of the coal liquefaction residue to the SBS modified asphalt is 40-50:50-60.

[0013] Preferably, the mass ratio of the coarse aggregate, the fine aggregate and the mineral powder is 45-55:43-52:2-4; the asphalt-aggregate ratio of the hot-pressed asphalt mixture is 4.8-5.5%.

[0014] Preferably, the rubber emulsion is one or more of natural rubber emulsion, styrene-butadiene latex, nitrile latex, ethylene-propylene latex and acrylic latex.

[0015] Preferably, the repair ball is a low molecular weight polystyrene shell and a dry alkyd resin filled in the shell, and the particle size of the polystyrene shell is 0.3-0.5 cm.

[0016] The present invention also provides an application of the hot-pressed asphalt waterproof bonding material in a road surface and a bridge deck.

[0017] The beneficial effects of the present invention include the following points:

[0018] 1) By controlling the particle sizes of the coarse aggregate, the fine aggregate and the mineral powder, the present invention improves the overall strength of the hot-pressed asphalt waterproof bonding material. The particles with different particle sizes are filled with each other, and the whole is relatively dense, so that the hot-pressed asphalt waterproof bonding material has good structural strength; the epoxy modified asphalt and the acrylic resin are crosslinked with each other after hot pressing, which can improve the road performance and strength of the mixture, and the dry alkyd resin filled in the repair ball can bond and repair the gaps, thereby improving the service life of the waterproof bonding material.

[0019] 2) By reasonably selecting the raw materials of the hot-pressed asphalt mixture and the raw materials of the waterproof bonding material, controlling the proportions and particle sizes of the raw materials, the invention significantly improves the dynamic stability in the rutting test, the low-temperature bending failure strain, the freeze-thaw splitting residual strength ratio, the immersion Marshall residual stability, the water stability and other properties, extends the service life of the road surface and the bridge deck, prolongs the maintenance cycle of the road surface and the bridge deck, and reduces the maintenance cost. Detailed implementation manners

[0020] The present invention provides a hot-pressed asphalt waterproof bonding material, and the hot-pressed asphalt waterproof bonding material comprises a waterproof bonding material and a hot-pressed asphalt mixture;

[0021] The hot-pressed asphalt mixture comprises a modified asphalt, coarse aggregates, fine aggregates and mineral powder; the coarse aggregates are limestone and steel slag, and the fine aggregates are one or more of manufactured sand, basalt and diabase;

[0022] The waterproof bonding material comprises a rubber emulsion, an acrylic resin, an epoxy-modified asphalt and repair balls; the mass ratio of the rubber emulsion, the acrylic resin, the epoxy-modified asphalt and the repair balls is 3-5: 1-3: 8-12: 1-2.

[0023] In the present invention, the mass ratio of the rubber emulsion, the acrylic resin, the epoxy-modified asphalt and the repair balls is preferably 3.5-4.5: 1.5-2.5: 9-11: 1.2-1.8, and further preferably 4-4.2: 1.8-2: 10-10.5: 1.5-1.6; the mass ratio of the limestone and the steel slag is preferably 2-4: 1, further preferably 2.5-3.5: 1, and more preferably 3: 1.

[0024] In the present invention, the acrylic resin is preferably an epoxy-modified acrylic resin.

[0025] In the present invention, the particle size of the coarse aggregates is preferably 2.36-19 mm, wherein the mass ratio of the coarse aggregates with a particle size of 2.36-4.75 mm (including 2.36 mm and 4.75 mm), the coarse aggregates with a particle size of 4.75-9.5 mm (excluding 4.75 mm, including 9.5 mm) and the coarse aggregates with a particle size of 9.5-19 mm (excluding 9.5 mm, including 19 mm) is preferably 1-3: 1-3: 1-2, and further preferably 2: 2: 1.5.

[0026] In the present invention, the particle size of the fine aggregates is preferably ≤2.36 mm, and further preferably 1.0-2.05 mm; the particle size of the mineral powder is preferably ≤0.6 mm, and further preferably 0.1-0.5 mm.

[0027] In the present invention, the modified asphalt is preferably composed of coal liquefaction residue and SBS modified asphalt, and the mass ratio of coal liquefaction residue to SBS modified asphalt is preferably 40-50:50-60, more preferably 42-48:52-58, and still more preferably 45-46:55-56.

[0028] In the present invention, the mass ratio of the coarse aggregate, fine aggregate and mineral powder is preferably 45-55:43-52:2-4, more preferably 47-53:46-50:2.5-3.5, and still more preferably 49-50:47-48:3; the asphalt-aggregate ratio (the percentage of coal liquefied asphalt in the total mass of the coarse aggregate, fine aggregate and mineral powder) of the hot-pressed asphalt mixture is preferably 4.8-5.5%, more preferably 5.0-5.2%.

[0029] In the present invention, the rubber emulsion is preferably one or more of natural rubber emulsion, styrene-butadiene latex, nitrile latex, ethylene-propylene latex and acrylic latex.

[0030] In the present invention, the repair ball is preferably a low molecular weight polystyrene shell and a dry alkyd resin filled in the shell. The particle size of the polystyrene shell is preferably 0.3-0.5 cm, more preferably 0.35-0.45 cm, and still more preferably 0.4 cm.

[0031] The present invention also provides the application of the hot-pressed asphalt waterproof bonding material in the road surface and bridge deck.

[0032] The technical solutions provided by the present invention will be described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0033] In the examples and comparative examples, the ash content of the coal liquefaction residue is 13.02%, the penetration (25°C, 100 g, 5 s (0.1 mm)) is 2, the softening point ≥ 160°C, the flash point is 330°C, and the density (25°C) is 1.211 g / cm 3 ;

[0034] The model of the epoxy-modified acrylic resin is HD-EA6020; the model of the epoxy-modified asphalt is AMP-PS; the molecular weight of the low molecular weight polystyrene is 200,000-250,000; the model of the alkyd resin is UR-7882.

[0035] Example 1

[0036] In this embodiment, the coarse aggregate is composed of limestone and steel slag with a mass ratio of 3:1. The particle size of the coarse aggregate is 2.36 - 19 mm. Among them, the mass ratio of the coarse aggregate with a particle size of 2.36 - 4.75 mm, the coarse aggregate with a particle size of 4.75 - 9.5 mm, and the coarse aggregate with a particle size of 9.5 - 19 mm is 2:2:1.5; the fine aggregate is manufactured sand, and the particle size of the fine aggregate is 1.0 - 2.36 mm. Among them, the mass ratio of the fine aggregate with a particle size of 1.0 - 2.05 mm and the fine aggregate with a particle size of 2.1 - 2.36 mm is 3:1; the particle size of the mineral powder is 0.1 - 0.5 mm. Among them, the mass ratio of the mineral powder with a particle size of 0.1 - 0.2 mm and the mineral powder with a particle size of 0.3 - 0.5 mm is 1:3; the modified asphalt is a mixture of coal liquefaction residue and SBS modified asphalt with a mass ratio of 45:55; the water absorption rate of the coarse aggregate is 0.92%, and the water content of the mineral powder is 0.45%.

[0037] The rubber emulsion is a mixture of natural rubber emulsion and ethylene-propylene rubber latex with a mass ratio of 1:1. The repair ball is a low molecular weight polystyrene shell and dry alkyd resin filled in the shell. The particle size of the polystyrene shell is 0.4 cm, and the mass ratio of the polystyrene shell to the dry alkyd resin is 5:1;

[0038] After uniformly stirring the coarse aggregate, fine aggregate and mineral powder, add the modified asphalt and stir at 50 °C for 60 min to obtain a hot-pressed asphalt mixture; the mass ratio of the coarse aggregate, fine aggregate and mineral powder is 50:48:3, and the asphalt-aggregate ratio of the hot-pressed asphalt mixture is 5.2%;

[0039] After stirring the rubber emulsion, epoxy-modified acrylic resin and epoxy-modified asphalt for 30 min, add the repair ball and stir for 30 min to obtain a waterproof bonding material; the mass ratio of the rubber emulsion, epoxy-modified acrylic resin, epoxy-modified asphalt and repair ball is 4:2:10:1.5.

[0040] Example 2

[0041] In this embodiment, the coarse aggregate is composed of limestone and steel slag with a mass ratio of 4:1. The particle size of the coarse aggregate is 2.36 - 19 mm. Among them, the mass ratio of the coarse aggregate with a particle size of 2.36 - 4.75 mm, the coarse aggregate with a particle size of 4.75 - 9.5 mm, and the coarse aggregate with a particle size of 9.5 - 19 mm is 1:3:2; the fine aggregate is basalt, and the particle size of the fine aggregate is 1.0 - 2.36 mm. Among them, the mass ratio of the fine aggregate with a particle size of 1.0 - 1.8 mm and the fine aggregate with a particle size of 2.0 - 2.36 mm is 3:1; the particle size of the mineral powder is 0.2 - 0.5 mm. Among them, the mass ratio of the mineral powder with a particle size of 0.2 - 0.3 mm and the mineral powder with a particle size of 0.4 - 0.5 mm is 2:5; the modified asphalt is a mixture of coal liquefaction residue and SBS modified asphalt with a mass ratio of 40:60; the water absorption rate of the coarse aggregate is 1.01%, and the water content of the mineral powder is 0.4%.

[0042] The rubber latex is styrene-butadiene rubber latex and acrylic rubber latex with a mass ratio of 1:1. The repair balls are composed of a low-molecular-weight polystyrene shell and dry alkyd resin filled inside the shell. The particle size of the polystyrene shell is 0.45 cm, and the mass ratio of the polystyrene shell to the dry alkyd resin is 4:1.

[0043] After uniformly stirring the coarse aggregate, fine aggregate and mineral powder, modified asphalt is added, and stirring is carried out at 50 °C for 60 min to obtain a hot-pressed asphalt mixture. The mass ratio of the coarse aggregate, fine aggregate and mineral powder is 47:50:2, and the asphalt-aggregate ratio of the hot-pressed asphalt mixture is 5.0%.

[0044] After stirring the rubber latex, epoxy-modified acrylic resin and epoxy-modified asphalt for 30 min, repair balls are added and stirred for 30 min to obtain a waterproof bonding material. The mass ratio of the rubber latex, epoxy-modified acrylic resin, epoxy-modified asphalt and repair balls is 4.5:2.5:11:1.8.

[0045] Example 3

[0046] In this example, the coarse aggregate is composed of limestone and steel slag with a mass ratio of 2.5:1. The particle size of the coarse aggregate is 2.36 - 19 mm. Among them, the mass ratio of the coarse aggregate with a particle size of 2.36 - 4.75 mm, the coarse aggregate with a particle size of 4.75 - 9.5 mm and the coarse aggregate with a particle size of 9.5 - 19 mm is 3:2:2. The fine aggregate is manufactured sand, and the particle size of the fine aggregate is 1.0 - 2.36 mm. Among them, the mass ratio of the fine aggregate with a particle size of 1.0 - 1.8 mm and the fine aggregate with a particle size of 2.0 - 2.36 mm is 2:3. The particle size of the mineral powder is 0.1 - 0.5 mm. Among them, the mass ratio of the mineral powder with a particle size of 0.1 - 0.2 mm to the mineral powder with a particle size of 0.3 - 0.5 mm is 1:4. The modified asphalt is a mixture of coal liquefaction residue and SBS modified asphalt with a mass ratio of 50:50. The water absorption rate of the coarse aggregate is 0.85%, and the water content of the mineral powder is 0.5%.

[0047] The rubber latex is styrene-butadiene rubber latex and nitrile-butadiene rubber latex with a mass ratio of 1:1. The repair balls are composed of a low-molecular-weight polystyrene shell and dry alkyd resin filled inside the shell. The particle size of the polystyrene shell is 0.35 cm, and the mass ratio of the polystyrene shell to the dry alkyd resin is 4:1.

[0048] After uniformly stirring the coarse aggregate, fine aggregate and mineral powder, modified asphalt is added, and stirring is carried out at 50 °C for 60 min to obtain a hot-pressed asphalt mixture. The mass ratio of the coarse aggregate, fine aggregate and mineral powder is 53:46:3, and the asphalt-aggregate ratio of the hot-pressed asphalt mixture is 5.3%.

[0049] After stirring the rubber latex, epoxy-modified acrylic resin, and epoxy-modified asphalt for 30 minutes, add the repair balls and stir for another 30 minutes to obtain a waterproof bonding material; the mass ratio of the rubber latex, epoxy-modified acrylic resin, epoxy-modified asphalt, and repair balls is 3.5:1.5:9:1.2.

[0050] Comparative Example 1

[0051] Omit the coal liquefaction residue, epoxy-modified acrylic resin, and rubber latex in Example 1. The asphalt-aggregate ratio of the hot-pressed asphalt mixture is 6.0%, and other conditions are the same as those in Example 1.

[0052] Comparative Example 2

[0053] Omit the repair balls and mineral powder in Example 1. The mass ratio of the coarse aggregate with a particle size of 2.36 - 4.75 mm, the coarse aggregate with a particle size of 4.75 - 9.5 mm, and the coarse aggregate with a particle size of 9.5 - 19 mm is 1:1:4. The mass ratio of the coarse aggregate, fine aggregate, and mineral powder is 60:30:1, and other conditions are the same as those in Example 1.

[0054] Hot-press the hot-pressed asphalt mixture and the waterproof bonding material in Example 1 successively at 70°C for 20 minutes and lay them on the road surface (using a conventional method in the art). The thickness of the hot-pressed asphalt mixture is 50 mm, and the thickness of the waterproof bonding material is 3 mm to obtain the hot-pressed asphalt waterproof bonding layer of Example 1; use the same process as above to lay the hot-pressed asphalt mixture and the waterproof bonding material of Example 2 and 3 and Comparative Examples 1 and 2, respectively, to obtain the hot-pressed asphalt waterproof bonding layers of Example 2 - 3 and Comparative Examples 1 - 2.

[0055] Test the road performance of the hot-pressed asphalt waterproof bonding layers of Examples 1 - 3 and Comparative Examples 1 - 2, and the results are shown in Table 1.

[0056] Table 1 Test results of the road performance of the hot-pressed asphalt waterproof bonding layers of the examples and comparative examples

[0057]

[0058]

[0059] It can be seen from the examples, comparative examples, and Table 1 that by reasonably selecting the raw materials of the hot-pressed asphalt mixture and the waterproof bonding material, controlling the ratio and particle size of each raw material, the invention significantly improves the rutting test dynamic stability, low-temperature bending failure strain, freeze-thaw splitting residual strength ratio, immersion Marshall residual stability, water stability and other properties of the hot-pressed asphalt waterproof bonding layer, extends the service life of the road surface and bridge deck, prolongs the maintenance cycle of the road surface and bridge deck, and reduces the maintenance cost.

[0060] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A hot-pressed asphalt waterproof bonding material, characterized in that: The hot-pressed asphalt waterproof bonding material comprises a waterproof bonding material and a hot-pressed asphalt mixture; The hot-pressed asphalt mixture comprises modified asphalt, coarse aggregate, fine aggregate and mineral powder; the coarse aggregate is limestone and steel slag, and the fine aggregate is one or more of machine-made sand, basalt and diabase; The waterproof bonding material comprises rubber latex, acrylic resin, epoxy modified asphalt and repair balls; the mass ratio of the rubber latex, acrylic resin, epoxy modified asphalt and repair balls is 3-5:1-3:8-12:1-2.

2. The hot-pressed asphalt waterproof adhesive material according to claim 1, characterized in that: The particle size of the coarse aggregate is 2.36-19 mm, wherein the mass ratio of the coarse aggregate with a particle size of 2.36-4.75 mm, the coarse aggregate with a particle size of 4.75-9.5 mm and the coarse aggregate with a particle size of 9.5-19 mm is 1-3:1-3:1-2.

3. The hot-pressed asphalt waterproof adhesive material according to claim 1 or 2, characterized in that: The particle size of the fine aggregate is ≤2.36mm; the particle size of the mineral powder is ≤0.6mm.

4. The hot-pressed asphalt waterproof adhesive material according to claim 3, characterized in that: The modified asphalt is composed of coal liquefaction residue and SBS modified asphalt, and the mass ratio of the coal liquefaction residue to the SBS modified asphalt is 40-50:50-60.

5. The hot-pressed asphalt waterproof adhesive material according to claim 4, characterized in that: The mass ratio of the coarse aggregate, the fine aggregate and the mineral powder is 45-55:43-52:2-4; the asphalt-stone ratio of the hot-pressed asphalt mixture is 4.8-5.5%.

6. The hot-pressed asphalt waterproof adhesive material according to claim 4 or 5, characterized in that: The rubber latex is one or more of natural rubber latex, styrene-butadiene latex, nitrile-butadiene latex, ethylene-propylene latex and acrylic latex.

7. The hot-pressed asphalt waterproof adhesive material according to claim 6, characterized in that: The repair ball is composed of a low molecular weight polystyrene shell and a dry alkyd resin filled in the shell, and the particle size of the polystyrene shell is 0.3-0.5 cm.

8. Use of the hot-pressed asphalt waterproof bonding material according to any one of claims 1 to 7 in road surfaces and bridge decks.

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