Cold-laid anti-slip wear layer materials and their preparation methods

Abstract

This invention discloses a cold-laid anti-skid wear layer material and its preparation method, comprising the following raw materials in parts by weight: 9-11 parts modified emulsified asphalt, 65-75 parts steel slag aggregate, 6-9 parts synthetic micro powder, 4.5-7 parts modified material, and 0-6 parts water. By optimizing the raw material composition and proportions and selecting a suitable mixing process, this invention obtains a cold-laid anti-skid wear layer material with strong adhesion, good high-temperature stability, and significantly improved oil separation.

Description

Technical Field

[0001] This invention relates to the field of road paving materials technology, and in particular to a cold-laid anti-skid wear layer material and its preparation method. Background Technology

[0002] As service life increases, high-grade pavements such as highways, urban trunk roads, and airport roads frequently exhibit typical defects such as cracks, ruts, and decreased skid resistance. To extend service life and ensure operational quality, preventative maintenance materials with waterproof, skid-resistant, and self-healing functions are often used for the pavement surface. Early methods primarily used hot-mix asphalt pavements, which required high temperatures during production and construction, were inconvenient to use, and suffered from high energy consumption, high emissions, and high pollution. With increasing awareness of environmental protection, emulsified asphalt mixtures, which can be mixed, laid, and compacted at room temperature, have emerged. These overcome the shortcomings of hot-mix asphalt mixtures and are a low-energy, low-emission green material, but some drawbacks still remain. For example: (1) The cohesion of the mixture is poor and the adhesion to the original road surface needs to be improved, which makes it easy to produce particles and peeling. The service life is only about 2 to 3 years; (2) The resistance to rutting is poor. When it is used for road rutting filling in the hot season, rutting disease is likely to occur again; (3) The low temperature toughness is poor. The crack resistance performance is reduced in the cold season, and crack disease is likely to occur, affecting its durability; (4) The wear resistance and anti-skid properties are poor. Summary of the Invention

[0003] To address the above problems, this invention provides a cold-laid anti-slip wear layer material, and also provides a method for preparing the cold-laid anti-slip wear layer material, specifically adopting the following technical solution:

[0004] The cold-laid anti-slip wear layer material of the present invention comprises the following raw materials in parts by weight:

[0005] 9-11 parts modified emulsified asphalt, 65-75 parts steel slag aggregate, 6-9 parts synthetic micro powder, 4.5-7 parts modified material, and 0-6 parts water.

[0006] The sieve passing rates of the steel slag aggregate, by mass percentage, are as follows: 100% for 13.2mm sieve, 100% for 9.5mm sieve, 83-96% for 7.2mm sieve, 70-90% for 4.75mm sieve, 45-70% for 2.36mm sieve, 28-80% for 1.18mm sieve, 19-34% for 0.6mm sieve, 12-25% for 0.3mm sieve, 7-18% for 0.15mm sieve, and 6-12% for 0.075mm sieve.

[0007] The synthetic micro powder is composed of carbide slag, red mud, calcium silicate slag, and desulfurization ash in a mass ratio of 3:1:2:1, and the specific surface area of ​​each of the carbide slag, red mud, calcium silicate slag, and desulfurization ash is not less than 350 m². 2 / kg.

[0008] The modified materials include octyl epoxy stearate, tributyl acetylcitrate, and 2-octyl alcohol polyoxyethylene ether.

[0009] The preparation method of the cold-laid anti-slip wear layer material of the present invention includes the following steps:

[0010] The first step is to weigh out the carbide slag, red mud, calcium silicate slag, and desulfurization ash according to the proportions, mix them, soak them in a mixed solution of ethanol and acetone, ball mill them to the required specific surface area using a horizontal ball mill, dry them, and obtain synthetic micro powder for later use.

[0011] The second step is to weigh 1-2 parts of redispersible latex powder and 1-2 parts of styrene-butadiene rubber powder, and mix them thoroughly with 6-9 parts of the synthetic micro powder obtained in step one. Set aside for later use.

[0012] The third step is to dilute the silane coupling agent ethanol aqueous solution with water at a ratio of 1:100, soak the steel slag aggregate for 1 hour, and then dry it for later use.

[0013] Fourth step: Weigh 0.5-1 part of 2-octyl alcohol polyoxyethylene ether and add it to 9-11 parts of modified emulsified asphalt for later use;

[0014] Fifth step: Thoroughly mix 8-13 parts of the synthetic micro powder mixture prepared in step two, 65-75 parts of the steel slag aggregate prepared in step three, 1 part of octyl epoxy stearate, and 1 part of tri-n-butyl acetylacetate, and set aside.

[0015] Step 6: Mix 9.5-12 parts of the modified emulsified asphalt prepared in step 4, 75-90 parts of the mixed material prepared in step 5, and 0-6 parts of water thoroughly to obtain the cold-laid anti-skid wear layer material.

[0016] In the first step, ethanol and acetone are mixed in a 1:1 volume ratio.

[0017] The silane coupling agent ethanol aqueous solution is composed of water, ethanol, and silane coupling agent in a mass ratio of 1:4:2.

[0018] The principles for raw material selection and process route design in this invention are as follows:

[0019] 1) Steel slag aggregate has the characteristics of high wear resistance and high strength. Its comprehensive performance is higher than that of limestone, basalt and other stone materials. Using it as the skeleton structure material of cold-laid anti-skid wear layer can significantly improve the wear resistance of road wear layer.

[0020] 2) In order to meet the technical specifications and road performance of steel slag asphalt mixtures, the amount of asphalt used as a binder in the past preparation process was often slightly higher than that of other components in the mixture. However, steel slag has a porous structure and a large specific surface area, which has the characteristics of high water and oil absorption. Therefore, when the above mixture is paved into a road surface, asphalt will gradually seep out from the voids of the steel slag aggregate under the load of traffic, resulting in oil bleeding on the road surface and negatively affecting the road performance.

[0021] In the preparation process of this invention, steel slag aggregate is pre-wetted with an ethanol aqueous solution of silane coupling agent. One end of the active group of the silane coupling agent forms a hydrogen bond with the surface of the steel slag, and the other end is connected with the asphalt. This chemical bonding and physical adsorption enhances the adhesion between the asphalt and the steel slag interface and significantly reduces the degree of oil seepage on the road surface.

[0022] 3) The high and low temperature performance of asphalt mixtures determines their application durability. Traditional modified emulsified asphalt has insufficient low temperature crack resistance and high temperature stability, and its asphalt anti-aging durability is poor.

[0023] Based on this, the present invention introduces two types of plasticizers into the material composition, which have the characteristics of cold resistance, water resistance, light resistance, weather resistance and heat resistance, respectively. In the asphalt system, they can ensure the performance of asphalt binder under coupled environments such as temperature, humidity and load, and reduce asphalt aging problems caused by ultraviolet radiation, air oxidation and dynamic fatigue.

[0024] 4) The emulsified asphalt used in the cold-laid anti-skid wear layer is a slow-cracking and fast-setting type. During the preparation process, its wetting effect also determines the adhesion between the asphalt and the aggregate. This invention introduces 2-octyl alcohol polyoxyethylene ether, making full use of its high wetting and penetration characteristics, and uses it as a surfactant in the emulsified asphalt system to improve the wetting effect on the aggregate, thereby enhancing the adhesion.

[0025] 5) In traditional preventive maintenance technology for asphalt pavements, taking micro-surfacing as an example, the components usually include materials such as mineral powder and cement. This invention introduces several solid waste materials such as carbide slag, red mud, calcium silicate slag, and desulfurization ash. On the one hand, it can make full use of the water in emulsified asphalt to undergo a gelation hydration reaction, which has cement-like consolidation and gelling characteristics. At the same time, since the adhesion between emulsified asphalt and aggregate is related to the charge of the aggregate, traditional emulsified asphalt mixtures improve adhesion by adding lime-like mineral powder. This invention selects materials such as carbide slag, red mud, and desulfurization ash, which have the same effect, and utilizes their alkalinity and surface charge characteristics to improve the adhesion between asphalt and steel slag aggregate.

[0026] In summary, by optimizing the composition and ratio of raw materials and selecting a suitable mixing process, this invention has obtained a cold-laid anti-slip wear layer material with strong adhesion, good high-temperature stability, and significantly improved oil separation phenomenon. Detailed Implementation

[0027] The following detailed description is based on the embodiments of the present invention. These embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific preparation processes. However, the scope of protection of the present invention is not limited to the following embodiments.

[0028] Example 1:

[0029] The cold-laid anti-slip wear layer material of the present invention includes

[0030] The cold-laid anti-skid wear layer material in this embodiment is composed of 9 parts modified emulsified asphalt, 68 parts steel slag aggregate, 9 parts synthetic micro powder, 7 parts modified material, and 5 parts water, measured by mass.

[0031] The gradation of steel slag aggregate is as follows:

[0032]

[0033] The components and proportions of the synthetic micro powder are as follows: 3.9 parts calcium carbide slag, 1.3 parts red mud, 2.6 parts calcium silicate slag, and 1.3 parts desulfurization ash; the components and proportions of the modified material are as follows: 1 part octyl epoxy stearate, 1 part tri-n-butyl acetylacetic acid, and 0.5 parts sec-octyl alcohol polyoxyethylene ether; the silane coupling agent ethanol aqueous solution is composed of 1 part water, 4 parts ethanol, and 2 parts silane coupling agent, and is prepared in appropriate quantities;

[0034] The cold-laid anti-slip wear layer mixture was prepared using the above formula, and the preparation method is as follows:

[0035] The first step involves weighing 3.9 parts of calcium carbide slag, 1.3 parts of desulfurization ash, 1.3 parts of red mud, and 2.6 parts of calcium silicate slag. These are then mixed together and soaked in a mixed solution of ethanol and acetone (mixed in a 1:1 volume ratio). The mixture is then ball-milled using a horizontal ball mill until the specific surface area is not less than 350 m². 2 / kg, dried to obtain synthetic micro powder for later use;

[0036] The second step is to weigh out 1 part of redispersible latex powder and 2 parts of styrene-butadiene rubber powder by weight, and mix them thoroughly with 9 parts of the synthetic micro powder obtained in step one. Set aside for later use.

[0037] The third step is to dilute the silane coupling agent ethanol aqueous solution with water at a ratio of 1:100, soak the steel slag aggregate for 1 hour, and then dry it for later use. The above silane coupling agent ethanol aqueous solution is composed of water, ethanol, and silane coupling agent in a mass ratio of 1:4:2.

[0038] Fourth step: Weigh 0.5 parts of 2-octyl alcohol polyoxyethylene ether and add it to 9 parts of modified emulsified asphalt, mix well and set aside.

[0039] Fifth step: Thoroughly mix 12 parts of the synthetic micro powder mixture prepared in step two, 68 parts of the steel slag aggregate prepared in step three, 1 part of octyl epoxy stearate, and 1 part of tributyl acetyl citrate, and set aside.

[0040] Step 6: Mix 9.5 parts of the modified emulsified asphalt prepared in step 4, 82 parts of the mixed material prepared in step 5, and 5 parts of water thoroughly to obtain the cold-laid anti-skid wear layer material.

[0041] Example 2:

[0042] The cold-laid anti-slip wear layer material of the present invention includes

[0043] The cold-laid anti-skid wear layer material in this embodiment is composed of 10 parts modified emulsified asphalt, 70 parts steel slag aggregate, 9 parts synthetic micro powder, 6 parts modified material, and 5 parts water, measured by mass.

[0044] The gradation of steel slag aggregate is as follows:

[0045]

[0046] The components and proportions of the synthetic micro powder are as follows: 3.9 parts calcium carbide slag, 1.3 parts red mud, 2.6 parts calcium silicate slag, and 1.3 parts desulfurization ash; the components and proportions of the modified material are as follows: 1 part octyl epoxy stearate, 1 part tri-n-butyl acetylacetic acid, and 1 part 2-octyl alcohol polyoxyethylene ether; the silane coupling agent ethanol aqueous solution is composed of 1 part water, 4 parts ethanol, and 2 parts silane coupling agent, and is prepared in appropriate quantities.

[0047] The cold-laid anti-slip wear layer mixture was prepared using the above formula, and the preparation method is as follows:

[0048] The first step involves weighing 3.9 parts of calcium carbide slag, 1.3 parts of desulfurization ash, 1.3 parts of red mud, and 2.6 parts of calcium silicate slag. These are then mixed together and soaked in a mixed solution of ethanol and acetone (mixed in a 1:1 volume ratio). The mixture is then ball-milled using a horizontal ball mill until the specific surface area is not less than 350 m². 2 / kg, dried to obtain synthetic micro powder for later use;

[0049] The second step is to weigh out 2 parts of redispersible latex powder and 2 parts of styrene-butadiene rubber powder by weight, and mix them thoroughly with 9 parts of the synthetic micro powder obtained in the first step.

[0050] The third step is to dilute the silane coupling agent ethanol aqueous solution with water at a ratio of 1:100, soak the steel slag aggregate for 1 hour, and then dry it for later use. The above silane coupling agent ethanol aqueous solution is composed of water, ethanol, and silane coupling agent in a mass ratio of 1:4:2.

[0051] Fourth step: Weigh 1 part of 2-octyl alcohol polyoxyethylene ether and add it to 10 parts of modified emulsified asphalt, mix well and set aside.

[0052] Fifth step: Thoroughly mix 13 parts of the synthetic micro powder mixture prepared in step two, 70 parts of the steel slag aggregate prepared in step three, 1 part of octyl epoxy stearate, and 1 part of tributyl acetyl citrate, and set aside.

[0053] Step 6: Mix 11 parts of the modified emulsified asphalt prepared in step 4, 85 parts of the mixed material prepared in step 5, and 5 parts of water thoroughly to obtain the cold-laid anti-skid wear layer material.

[0054] Comparative Example 1:

[0055] The cold-laid anti-skid wear layer material in this embodiment is composed of 10 parts modified emulsified asphalt, 76 parts steel slag aggregate, 9 parts cement, and 5 parts water, measured by mass.

[0056] The gradation of steel slag aggregate is as follows:

[0057]

[0058] The cold-laid anti-slip wear layer mixture was prepared using the above formula, and the preparation method is as follows:

[0059] The cold-laid anti-skid wear layer material is made by thoroughly mixing modified emulsified asphalt, steel slag aggregate, cement, and water.

[0060] Comparative Example 2:

[0061] The cold-laid anti-slip wear layer material in this embodiment is composed of 10 parts modified emulsified asphalt, 70 parts steel slag aggregate, 9 parts cement, 6 parts modified material, and 5 parts water.

[0062] The gradation of steel slag aggregate is as follows:

[0063]

[0064] The modified material components and proportions are as follows: 1 part octyl epoxy stearate, 1 part tri-n-butyl acetylcitrate, and 1 part 2-octyl alcohol polyoxyethylene ether; the silane coupling agent ethanol aqueous solution is composed of 1 part water, 4 parts ethanol, and 2 parts silane coupling agent, and is prepared in several batches.

[0065] The cold-laid anti-slip wear layer mixture was prepared using the above formula, and the preparation method is as follows:

[0066] First, weigh 2 parts of redispersible latex powder, 2 parts of styrene-butadiene rubber powder and 9 parts of cement, mix them thoroughly and evenly, and set aside.

[0067] The second step is to weigh out 1 part of octyl alcohol polyoxyethylene ether by weight, add it to 10 parts of modified emulsified asphalt, mix well, and set aside.

[0068] The third step is to dilute the prepared silane coupling agent ethanol aqueous solution with water at a ratio of 1:100, soak the steel slag aggregate for 1 hour, and then dry it for later use. The above silane coupling agent ethanol aqueous solution is composed of water, ethanol, and silane coupling agent in a mass ratio of 1:4:2.

[0069] Fourth step: Take 13 parts of the mixture prepared in step one, 70 parts of the steel slag aggregate prepared in step three, 1 part of octyl epoxy stearate, and 1 part of tributyl acetyl citrate, mix them thoroughly and evenly, and set aside.

[0070] The fifth step involves thoroughly mixing 11 parts of the modified emulsified asphalt prepared in step two, 85 parts of the mixed material prepared in step four, and 5 parts of water to obtain the cold-laid anti-skid wear layer material.

[0071] Test results:

[0072] Test results of the mixture:

[0073]

[0074] Test results of modified emulsified asphalt:

[0075]

[0076] The experimental data from the above embodiments and comparative examples show that the wear layer material prepared using the material formulation and preparation process of the present invention has significantly improved adhesion and high-temperature stability, resulting in a significant performance improvement.

[0077] It should be noted that in the description of this invention, terms such as "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating orientation or positional relationships are based on the indicated orientation or positional relationships and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

Claims

1. A cold-laid anti-slip wear layer material, characterized in that: The raw materials include the following parts by weight: 9-11 parts modified emulsified asphalt, 65-75 parts steel slag aggregate, 6-9 parts synthetic micro powder, 4.5-7 parts modifier, and 0-6 parts water; The sieve passing rate of the steel slag aggregate, expressed as a percentage by mass, is: The percentages for different sieve sizes are as follows: 13.2mm sieve, 9.5mm sieve, 7.2mm sieve, 4.75mm sieve, 2.36mm sieve, 1.18mm sieve, 0.6mm sieve, 0.3mm sieve, 0.15mm sieve, and 0.075mm sieve. The synthetic micro powder is composed of carbide slag, red mud, calcium silicate slag, and desulfurization ash in a mass ratio of 3:1:2:1, and the specific surface area of ​​each of the carbide slag, red mud, calcium silicate slag, and desulfurization ash is not less than 350 m². 2 / kg; The modified materials include octyl epoxy stearate, tributyl acetylcitrate, and 2-octyl alcohol polyoxyethylene ether.

2. The method for preparing the cold-laid anti-slip wear layer material according to claim 1, characterized in that: Includes the following steps: The first step is to weigh out the carbide slag, red mud, calcium silicate slag, and desulfurization ash according to the proportions, mix them, soak them in a mixed solution of ethanol and acetone, ball mill them to the required specific surface area using a horizontal ball mill, dry them, and obtain synthetic micro powder for later use. The second step is to weigh 1-2 parts of redispersible latex powder and 1-2 parts of styrene-butadiene rubber powder, and mix them thoroughly with 6-9 parts of the synthetic micro powder obtained in step one. Set aside for later use. The third step is to dilute the silane coupling agent ethanol aqueous solution with water at a ratio of 1:100, soak the steel slag aggregate for 1 hour, and then dry it for later use. Fourth step: Weigh 0.5-1 part of 2-octyl alcohol polyoxyethylene ether and add it to 9-11 parts of modified emulsified asphalt for later use; Fifth step: Thoroughly mix 8-13 parts of the synthetic micro powder mixture prepared in step two, 65-75 parts of the steel slag aggregate prepared in step three, 1 part of octyl epoxy stearate, and 1 part of tri-n-butyl acetylacetate, and set aside. Step 6: Mix 9.5-12 parts of the modified emulsified asphalt prepared in step 4, 75-90 parts of the mixed material prepared in step 5, and 0-6 parts of water thoroughly to obtain the cold-laid anti-skid wear layer material.

3. The method for preparing the cold-laid anti-slip wear layer material according to claim 2, characterized in that: In the first step, ethanol and acetone are mixed in a 1:1 volume ratio.

4. The method for preparing the cold-laid anti-slip wear layer material according to claim 2, characterized in that: The silane coupling agent ethanol aqueous solution is composed of water, ethanol, and silane coupling agent in a mass ratio of 1:4:2.

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