Self-ice-melting asphalt mixture ultrathin sealing layer material and preparation method thereof

Abstract

The invention relates to the technical field of ultrathin layer mixtures, in particular to a self-ice-melting asphalt mixture ultrathin seal coat material and a preparation method thereof. The anti-skid asphalt comprises the following raw materials in parts by weight: 8-14 parts of cationic high-viscosity modified emulsified asphalt, 66-84 parts of anti-skid aggregate, 5-8 parts of an anti-freezing agent, 0.5-5 parts of stone chips, 0.5-3 parts of cement and 2-8 parts of water. Raw materials of the cationic high-viscosity modified emulsified asphalt comprise a modifier, a tackifier, a cationic emulsifier and a stabilizer, the modifier is a linear low-molecular-weight SBS modifier, and the tackifier is an organic tackifier. The ultra-low-temperature long-acting self-ice-melting asphalt mixture ultra-thin sealing layer material provided by the invention can solve the problem that asphalt cement in micro-surfacing, ultra-thin fog sealing layers and other materials is influenced by salinized substances and is difficult to demulsify and solidify, meanwhile, the mixing amount of an ice and snow melting material is greatly increased, the ice and snow melting effect and the service life at the ultra-low temperature are ensured, and the service life of the material is prolonged. Good comprehensive performance is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-thin layer mixtures, and particularly to an anti-icing asphalt mixture ultra-thin sealant material and a preparation method thereof. Background Art

[0002] With the increasing number of extremely cold weather, the traffic capacity of the road network is increasingly affected by icing and freezing rain in ultra-low temperature environments. Road surface icing in winter leads to a decline in the anti-skid performance of the road surface and paralysis of transportation, affecting driving safety. Icing and freezing rain cannot be predicted in time, and it is not easy to identify the icing sections under ultra-low temperature environmental conditions, and they cannot be cleared in time, which is extremely harmful. Moreover, the efficiency of mechanically removing hidden ice is low and it is easy to cause damage to the road surface. The use of self-icing technology has the advantages of high efficiency, low cost, and no damage to the road surface. At present, the research on the application of anti-icing asphalt mixtures is mainly focused on the self-icing technology of asphalt pavements in winter. It is mainly applicable to relatively thick asphalt concrete with a thickness of more than 4 cm, and is mainly used for newly built pavements, not for the maintenance projects of existing pavements, and the related costs are relatively high. Therefore, at home and abroad, the development is towards thin-layer types such as micro-surfacing and ultra-thin fog seal. However, since the effective substances of commonly used snow and ice melting materials mainly include several types such as chlorides and organic salts, all of which are alkaline materials, they have a relatively large impact on the demulsification speed and bonding performance of emulsified asphalt, resulting in poor ice melting effects of existing self-icing thin-layer technologies, and also affecting the interfacial bonding state between materials such as micro-surfacing and ultra-thin fog seal and the old road surface, thus causing diseases such as peeling. Developing a durable self-icing asphalt mixture ultra-thin sealant material for maintenance projects can solve the compatibility problem between the snow and ice melting material and emulsified asphalt, effectively increase the dosage of the snow and ice melting material, ensure the ice melting effect at a relatively low temperature (-18°C), and at the same time enhance the adhesion between the asphalt binder and the aggregate under alkaline conditions, improve the anti-shear performance of the asphalt mixture, and can be used for the maintenance projects of highway black spots in previous winters or sections with high incidence of road surface icing and freezing rain.

[0003] Since the current main ice-melting and snow-melting materials include several types such as chlorides and organic salts, all of which are alkaline materials, their ions will affect the formation and stability of emulsified asphalt. Therefore, generally a relatively small amount of fine-grained granular salts or powdered salts are used, and the ice-melting and ice-inhibiting effects are often not ideal. Moreover, the strength of the fine-grained particles is low and they are easy to break, affecting durability and the anti-skid performance of the road surface. At the same time, the ultra-thin seal coat maintenance material is different from ordinary asphalt mixtures. The evaluation and preparation methods of self-ice-melting asphalt mixtures cannot be directly used to determine the quantitative design of the compatibility of ultra-thin seal coats. Therefore, it is necessary to develop an ultra-low temperature asphalt mixture ultra-thin seal coat material and its preparation method for the anti-icing needs in winter under extreme climates. Invention CN113150690A is composed of a slow-release anti-icing material, emulsified asphalt, water-based epoxy resin, curing agent and penetrant; Invention CN116376517A prepares an anti-icing slow-release material by using powdered vermiculite and an anti-icing material, and incorporates polyvinyl alcohol fibers to enhance the anti-icing effect by the bridging action of the fibers. These two inventions mainly form an insoluble three-dimensional network by using water-based epoxy resin to fill the gaps and repair the bonding effect of asphalt binder, mainly as a crack-sealing technology, only for treating tiny cracks on the road surface, which are different from the materials, technical characteristics and application scenarios of the long-term self-ice-melting asphalt mixture ultra-thin seal coat to be provided. Invention CN114031343A is an environmentally friendly slow-release anti-icing micro-surfacing material and its preparation method, focusing on environmentally friendly ice-melting and snow-melting materials. The main substance of the ice-melting agent is potassium formate, with a content of 8% - 10%. A relatively high content of potassium formate will lead to a high cost and poor economy, not suitable for large-scale application. Moreover, potassium formate has a strong moisture absorption capacity and is easy to agglomerate, and it is easy to form a water film on the road surface during driving, reducing the anti-skid coefficient. Invention CN109534734B uses a slow-cracking and quick-setting styrene-butadiene rubber (SBR) polymer-modified emulsified asphalt, and the emulsifier is an amine cationic emulsifier. At the same time, by optimizing the stirring speed and time in the preparation process, the cohesion and strength of the anti-icing material are controlled. However, the dosage of the snow-melting agent in this invention is only 0.5% - 4.2%, only suitable for ice and snow environments with an ambient temperature higher than -10°C; and from the test results of the invention examples, when the content of the snow-melting agent exceeds 3%, the compatibility grade value has dropped to grade B. Therefore, this invention does not have the possibility of directly increasing the dosage of the snow-melting agent and does not belong to the long-term self-ice-melting technology under ultra-low temperature conditions. At present, it is urgent to develop a new type of ultra-low temperature long-term self-ice-melting asphalt mixture ultra-thin seal coat material and its preparation method. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an ultra-low temperature long-term self-ice-melting asphalt mixture ultra-thin seal coat material and its preparation method. The present invention can solve the problems that the asphalt binder in materials such as micro-surfacing and ultra-thin fog seal coat is affected by salts and is difficult to demulsify and cure, and at the same time greatly increase the dosage of ice-melting and snow-melting materials, ensuring the ice-melting and snow-melting effects and service life at ultra-low temperatures.

[0005] In the first aspect, the (ultra-low temperature long-lasting) self-thawing ice asphalt mixture ultra-thin sealant material provided by the present invention comprises raw materials in the following parts by weight: 8-14 parts of cationic high-viscosity modified emulsified asphalt, 66-84 parts of anti-skid aggregate, 5-8 parts of anti-icing agent, 0.5-5 parts of stone chips, 0.5-3 parts of cement, and 2-8 parts of water; the raw materials of the cationic high-viscosity modified emulsified asphalt include a modifier, a tackifier, a cationic emulsifier, and a stabilizer, the modifier is a linear low-molecular-weight SBS modifier, and the tackifier is an organic tackifier. In the present invention, according to the anti-icing requirements in winter under extreme climates (ultra-low temperature of -18°C), by optimizing conditions such as raw materials of asphalt binder, modifier, tackifier, emulsifier, stabilizer, etc. and optimizing the formula, a high-compatibility design of high-viscosity modified emulsified asphalt and snow-melting materials is achieved, and the compatibility problem between asphalt binder and snow-melting materials is solved, greatly increasing the dosage range of snow-melting materials, developing an ultra-low temperature long-lasting self-thawing ice asphalt mixture ultra-thin sealant material, and the anti-icing effect at -18°C can meet the requirements, effectively extending the service life. The additives such as the adopted stabilizer have the functions of stable dispersion and overlapping network structure, comprehensively improving the performance of high-viscosity asphalt. The cationic high-viscosity modified emulsified asphalt adopted in the present invention can effectively improve the adhesion performance between emulsified asphalt and each aggregate in the formula system, enhance the adhesion between asphalt binder and stone materials under alkaline conditions, and further improve the shear resistance of asphalt mixture, avoiding diseases caused by poor adhesion between maintenance materials and old road surfaces, and at the same time improving comprehensive performances such as the anti-skid performance of the road surface.

[0006] Preferably, the cationic high-viscosity modified emulsified asphalt is prepared from the raw materials of high-viscosity modified asphalt and soap solution. The raw materials of the high-viscosity modified asphalt include matrix asphalt, aromatic hydrocarbon, tackifier, modifier, and stabilizer. Preferably, the mass ratio of the matrix asphalt, aromatic hydrocarbon, tackifier, modifier, and stabilizer is 55-65:1-3:0.5-1.5:2.5-6:1-3; the raw materials of the soap solution include a cationic emulsifier, water, and hydrochloric acid. Preferably, the mass ratio of the cationic emulsifier, water, and hydrochloric acid is 2-2.5:30-38:1-3. In the present invention, by optimizing the raw materials and dosage of the high-viscosity modified emulsified asphalt, its comprehensive effect is significantly better than that of the polymer modified emulsified asphalt adopted in the existing invention, achieving better compatibility between the high-viscosity modified emulsified asphalt and the snow-melting agent and increasing the dosage of the snow-melting materials, being able to better meet the anti-icing requirements at -18°C, effectively extending the service life, and being beneficial to improving the adhesion to aggregates, and enhancing the shear resistance and anti-skid performance of asphalt mixture.

[0007] Further preferably, the cationic high-viscosity modified emulsified asphalt comprises raw materials with the following mass contents: matrix asphalt 55% - 65%, modifier 2.5% - 6%, aromatic hydrocarbon 1% - 3%, tackifier 0.5% - 1.5%, stabilizer 1% - 3%, cationic emulsifier 1.2% - 2.5%, water 30% - 38%, hydrochloric acid 1% - 3%; preferably, matrix asphalt 56% - 62%, linear low-molecular-weight SBS modifier 3.5% - 5%, aromatic hydrocarbon 1% - 3%, tackifier 1% - 1.5%, stabilizer 2% - 3%, cationic emulsifier 1.2% - 2%, water 32% - 37%, hydrochloric acid 1% - 3%; most preferably, matrix asphalt 57 - 58%, linear low-molecular-weight SBS modifier 3.5 - 4%, aromatic hydrocarbon 1%, tackifier 1%, stabilizer 2%, cationic emulsifier 1.5%, water 32%, hydrochloric acid 1%.

[0008] Preferably, the number-average molecular weight of the modifier is 50,000 - 80,000, preferably 50,000 - 60,000.

[0009] Preferably, the stabilizer is selected from one or more of rubber powder, sulfur and carbon black; in the present invention, using the above rubber powder as the stabilizer can better play the role of stable dispersion and lap network structure, and effectively prevent the precipitation of asphalt particles, comprehensively improving the performance of high-viscosity asphalt.

[0010] Further preferably, the stabilizer is rubber powder and sulfur with a mass ratio of 1 - 2:0 - 2, more preferably rubber powder and sulfur with a mass ratio of 1:1.

[0011] Preferably, the matrix asphalt is 70# matrix asphalt and / or 90# matrix asphalt, preferably 70# matrix asphalt.

[0012] Preferably, the aromatic hydrocarbon is rubber oil, preferably refined from crude oil or lubricating oil, with a high content of light components, and serves as a compatibilizer.

[0013] Preferably, the tackifier is hydroxyethyl cellulose and / or polyacrylamide. In the present invention, using the above-mentioned hydroxycellulose ether type of tackifier can better cooperate with other components, and can more effectively improve the viscosity of the binder and the shear resistance of the mixture under a certain dosage.

[0014] Preferably, the cationic emulsifier is an amine-based cationic emulsifier, preferably quaternary ammonium salts and / or amides.

[0015] Preferably, the hydrochloric acid is 30% - 40% industrial hydrochloric acid.

[0016] In the present invention, the cationic high-viscosity modified emulsified asphalt with preferred raw materials and proportions can greatly increase the dosage and compatibility of the ice-melting and snow-melting materials, and better meet the usage requirements at ultra-low temperatures. Moreover, the high-viscosity modified emulsified asphalt used in the present invention has a high viscosity, and the formed asphalt mixture has better performance and better bearing capacity, avoiding diseases such as shedding and loosening.

[0017] Further preferably, the dynamic viscosity of the high-viscosity modified asphalt at 60 °C is not less than 30,000 Pa·s, preferably not less than 60,000 Pa·s.

[0018] Further preferably, the pH value of the soap solution is 2-6, preferably 3-4.

[0019] Further preferably, the anti-icing agent comprises a porous powder material adsorbed with a saturated amount of salt compounds. The salt compounds are selected from NaCl and / or CaCl2, preferably NaCl, and the porous powder material is volcanic rock powder.

[0020] In the present invention, the anti-icing agent used is a porous powder material made by grinding a volcanic rock, and a composite solid material with specific salt compounds embedded in its pores. This anti-icing agent can better match with the cationic high-viscosity modified emulsified asphalt, increase the dosage of the ice-melting and snow-melting materials, and further improve the comprehensive performance of the mixture through the interaction of each component of the formula and condition optimization.

[0021] Preferably, the anti-skid aggregate is basalt and / or diabase; the particle size of the stone chips is 3-5 mm; in the present invention, when the above anti-skid aggregate is used in the mixture and the stone chips are increased, the surface texture depth of the road can be increased, the anti-skid performance of the road surface can be improved, and the anti-wear performance can be further improved.

[0022] Preferably, the gradation is MS-1 standard gradation, MS-2 standard gradation or MS-3 standard gradation, preferably MS-3 standard gradation.

[0023] Preferably, the cement is ordinary Portland cement with a 28-day compressive strength of 32.5-52.5 MPa, preferably ordinary Portland 425 cement.

[0024] Preferably, the ultra-low temperature long-lasting self-melting ice asphalt mixture ultra-thin seal coating material uses the following raw materials by mass content: 8%-14% cationic high-viscosity modified emulsified asphalt, 66%-84% anti-skid aggregate, 5%-8% anti-icing agent, 0.5%-5% stone chips, 0.5%-3% cement, 2%-8% water.

[0025] Preferably, 10%-14% cationic high-viscosity modified emulsified asphalt, 70%-80% anti-skid aggregate, 5.5%-7% anti-icing agent, 2%-4% stone chips, 0.5%-3% cement, 2%-8% water.

[0026] Further preferably, it is composed of 11% - 12% cationic high-viscosity modified emulsified asphalt, 74% - 77% anti-skid aggregate, 5.5% - 6% anti-icing agent, 2% - 4% stone chips, 0.5% - 3% cement, and 3% - 4% water. The comprehensive performance is better under the preferred formula.

[0027] In the second aspect, the present invention provides a method for preparing the above-mentioned ultra-low temperature long-lasting self-melting ice asphalt mixture ultra-thin seal coat material, including: mixing cationic high-viscosity modified emulsified asphalt, anti-skid aggregate, anti-icing agent, stone chips, cement and water.

[0028] Preferably, it includes: adopting the cold mixing and cold paving technology, controlling the rolling time according to the demulsification speed of the emulsified asphalt, and using a rubber-tyred roller to roll out the moisture, with the tonnage requirement being medium and small.

[0029] Further preferably, it includes the following steps: 1) Prepare cationic high-viscosity modified emulsified asphalt.

[0030] 2) Mix the anti-skid aggregate, stone chips, cement, anti-icing agent and water, and stir at a stirring rate of 50 - 60 rpm for 10 - 30 s to obtain an intermediate mixture.

[0031] 3) Mix the cationic high-viscosity modified emulsified asphalt with the intermediate mixture, and stir at a stirring rate of 65 - 90 rpm, preferably 78 - 82 rpm, for 20 - 35 s, preferably 30 s.

[0032] Preferably, the paving temperature is not lower than 10°C, and the compaction pressure is 0.11 - 0.15 MPa.

[0033] Preferably, the preparation of the cationic high-viscosity modified emulsified asphalt includes: 1) Prepare high-viscosity modified asphalt: Mix matrix asphalt, aromatic hydrocarbon and tackifier at high temperature and stir, and then sequentially add modifier and stabilizer under stirring conditions to obtain high-viscosity modified asphalt.

[0034] 2) Prepare soap solution: Mix water, hydrochloric acid and cationic emulsifier, and then adjust the pH value to obtain soap solution.

[0035] 3) High-temperature shear grinding: Mix the soap solution with high-viscosity modified asphalt and conduct high-temperature shear grinding.

[0036] Further preferably, the preparation of the cationic high-viscosity modified emulsified asphalt includes: 1) Preparation of highly viscous modified asphalt: Heat the base asphalt to 160 - 170 °C, then add aromatic hydrocarbons and tackifiers and stir for 30 - 45 min. After heating to 180 - 190 °C, add the modifier and stir for 1.5 ± 0.5 h, then perform high-speed shearing at 8000 ± 1000 r / min for 50 - 70 min, add the stabilizer and stir for 30 - 45 min to obtain the highly viscous modified asphalt.

[0037] 2) Preparation of soap solution: Heat water to 50 - 60 °C, add hydrochloric acid and cationic emulsifier under stirring conditions, and then adjust the pH value to 4 - 5 with hydrochloric acid to obtain the soap solution.

[0038] 3) High-temperature shearing and grinding: Mix the soap solution with the highly viscous modified asphalt, perform colloid mill high-temperature shearing and grinding at 160 - 170 °C for 1 - 3 min, and then quickly cool it to 40 ± 5 °C in a cold water bath.

[0039] The beneficial effects of the present invention are at least as follows: In the ultra-low temperature long-lasting self-melting ice asphalt mixture ultra-thin seal coating material of the present invention, the dosage of the snow melting agent is high, which is twice that of the existing anticoagulant ice maintenance materials, and can meet the ice melting and snow melting requirements at relatively low temperatures (-18 °C); the dynamic viscosity of the asphalt binder at 60 °C is not less than 30000 Pa·s, with strong anti-shear performance and interlayer bonding performance. Adding stone chips increases the surface texture depth of the road surface, resulting in better anti-skid performance, effectively improving the service life and safety performance of the pre-maintenance material, and having good economic benefits. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is a schematic diagram after paving the ultra-low temperature long-lasting self-melting ice asphalt mixture ultra-thin seal coating material (right lane) and ordinary cold-laid asphalt mixture (left lane) provided in Embodiment 1 of the present invention.

[0042] Figure 2 It is a schematic diagram after three months of driving for the ultra-low temperature long-lasting self-melting ice asphalt mixture ultra-thin seal coating material (right lane) and ordinary cold-laid asphalt mixture (left lane) provided in Embodiment 1 of the present invention. Detailed Embodiments

[0043] To make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions in the present invention will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0044] In the present invention, the endpoints and any values in the disclosed ranges are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in the present invention.

[0045] For those not specifying specific technologies or conditions in the embodiments of the present invention, they are carried out according to the technologies or conditions described in the literature in the field or according to the product specifications. For those devices, instruments, reagents, etc. not specifying the manufacturer, they are all conventional products that can be obtained through regular channels. The experimental reagents and raw materials involved are all commercially available products, and the reagents are all analytical pure products.

[0046] Example 1 This example provides a super-low-temperature long-lasting self-melting ice asphalt mixture ultra-thin seal coat material, and the raw material composition is as follows: 12% cationic high-viscosity modified emulsified asphalt, 74.5% anti-skid aggregate, 5.5% anti-icing agent, 3% stone chips, 1.5% cement, 3.5% water. The raw material composition of the cationic high-viscosity modified emulsified asphalt is 58% matrix asphalt, 3.5% linear low-molecular-weight SBS modifier, 1% aromatic hydrocarbon, 1% tackifier, 2% stabilizer, 1.5% emulsifier, 32% water, and 1% hydrochloric acid. The number-average molecular weight of the linear low-molecular-weight SBS modifier is 60,000. The aromatic hydrocarbon is KQ-24 from Shandong Changtai Petrochemical Technology Co., Ltd., the tackifier is hydroxyethyl cellulose, and the emulsifier uses quaternary ammonium salt cationic emulsifier. The matrix asphalt is 70# matrix asphalt. The stabilizer is rubber powder:sulfur with a mass ratio of 1:1. The hydrochloric acid is 36% industrial hydrochloric acid. The anti-icing agent contains volcanic rock powder with an adsorption saturation amount of NaCl. The anti-skid aggregate is basalt. The maximum particle size of the stone chips is 5 mm. The gradation is MS-3 standard gradation. The cement is ordinary Portland 425 cement.

[0047] This example also provides a preparation method for the above super-low-temperature long-lasting self-melting ice asphalt mixture ultra-thin seal coat material, and the steps are as follows: 1) Preparation of cationic high-viscosity modified emulsified asphalt: Preparation of highly viscous modified asphalt: Heat the base asphalt to 165 °C, then add aromatic hydrocarbons and tackifiers and stir for 35 ± 0.5 min. Raise the temperature to 185 °C, add the modifier and stir for 1.5 ± 0.1 h, then perform high-speed shearing at 8000 r / min for 60 ± 0.5 min. Add the stabilizer and stir for 35 ± 0.5 min to obtain highly viscous modified asphalt (60 °C dynamic viscosity ≥ 60000 Pa·s).

[0048] Preparation of soap solution: Heat water to 55 °C, and sequentially add hydrochloric acid and emulsifier under stirring conditions, then adjust the pH value to 4.5 ± 0.2 with hydrochloric acid to obtain the soap solution.

[0049] High-temperature shearing and grinding: Mix the soap solution with the highly viscous modified asphalt, perform high-temperature shearing and grinding with a colloid mill at 170 °C for 2 ± 0.5 min, and then quickly cool it to 40 °C in a cold water bath.

[0050] 2) Add the uniformly mixed anti-skid aggregate, stone chips, cement and anti-icing agent to water, and stir at a stirring rate of 60 rpm for 20 s to mix evenly to obtain an intermediate mixture.

[0051] 3) Add the cationic highly viscous modified emulsified asphalt to the intermediate mixture, and stir at a stirring rate of 80 rpm for 30 s to mix evenly to obtain the anti-icing micro-surfacing material.

[0052] Comparative Example 1 This comparative example provides an anti-icing micro-surfacing material, which is prepared by the following method: 1) Weigh the following raw materials by weight percentage: 9.5% of SBR polymer modified emulsified asphalt, 75.7% of aggregate, 9.5% of water, 4% of anti-icing agent and 1.3% of cement. Among them, the anti-icing agent has an effective component of NaCl (≥80%) and CaCl2.

[0053] 2) Add the uniformly mixed aggregate, cement and anti-icing agent to water, and stir at a stirring rate of 60 rpm for 20 s to mix evenly to obtain an intermediate mixture.

[0054] 3) Add the cationic highly viscous modified emulsified asphalt to the intermediate mixture, and stir at a stirring rate of 80 rpm for 25 s to mix evenly to obtain the anti-icing micro-surfacing material.

[0055] Comparative Example 2 This comparative example provides an anti-icing micro-surfacing material, 6% of SBR polymer modified emulsified asphalt, 82% of aggregate, 2% of water, 8% of anti-icing agent, 0.5% of stabilizer (polyvinyl alcohol PVA 17-88 saturated solution) and 1.5% of cement. Among them, the effective component of the anti-icing agent is formate potassium.

[0056] Comparative Example 3 The method of Example 1 is adopted, with the difference being that no stone chips are added.

[0057] Comparative Example 4 This comparative example provides a super-low-temperature long-acting self-melting ice asphalt mixture ultra-thin seal coat material. The method of Example 1 is adopted, with the differences being that the amount of the anti-icing agent is changed from 5.5% to 3%, the amount of the cationic anti-skid aggregate is changed from 74.5% to 76.5%, and the amount of water is changed from 3.5% to 3%.

[0058] Example 2 This example provides a super-low-temperature long-acting self-melting ice asphalt mixture ultra-thin seal coat material, and the raw material composition is as follows: 12% cationic high-viscosity modified emulsified asphalt, 74.5% anti-skid aggregate, 5.5% anti-icing agent, 3% stone chips, 1.5% cement, 3.5% water. The raw material composition of the cationic high-viscosity modified emulsified asphalt is 58% matrix asphalt, 3.5% linear low-molecular-weight SBS modifier, 1% aromatic hydrocarbon, 1% tackifier, 2% stabilizer, 1.5% emulsifier, 32% water, and 1% hydrochloric acid. The number-average molecular weight of the linear low-molecular-weight SBS modifier is 60000. The aromatic hydrocarbon is KQ-24 of Shandong Changtai Petrochemical Technology Co., Ltd., the tackifier is hydroxyethyl cellulose, and the emulsifier adopts a quaternary ammonium salt cationic emulsifier. The matrix asphalt is 70# matrix asphalt. The stabilizer is rubber powder: sulfur with a mass ratio of 1:1. The hydrochloric acid is 36% industrial hydrochloric acid. The anti-icing agent contains volcanic rock powder with an adsorbed saturated amount of NaCl. The anti-skid aggregate is basalt. The maximum particle size of the stone chips is 5 mm. The gradation is the MS-3 standard gradation. The cement is ordinary Portland 425 cement.

[0059] This example also provides a preparation method of the above super-low-temperature long-acting self-melting ice asphalt mixture ultra-thin seal coat material, and the steps are as follows: 1) Preparation of cationic high-viscosity modified emulsified asphalt: Preparation of high-viscosity modified asphalt: Heat the matrix asphalt to 165 °C, then add the aromatic hydrocarbon and the tackifier and stir for 35 ± 0.5 min, raise the temperature to 185 °C, add the modifier and stir for 1.5 ± 0.1 h, then perform high-speed shearing at 8000 r / min for 60 ± 0.5 min, add the stabilizer and stir for 35 ± 0.5 min to obtain high-viscosity modified asphalt (the dynamic viscosity at 60 °C ≥ 60000 Pa·s).

[0060] Configuration of soap solution: Heat the water to 55 °C, sequentially add hydrochloric acid and the emulsifier under stirring conditions, and then adjust the pH value to 4.5 ± 0.2 with hydrochloric acid to obtain the soap solution.

[0061] High-temperature shearing and grinding: Mix the soap solution with the high-viscosity modified asphalt, perform colloid mill high-temperature shearing and grinding at 170 °C for 2 ± 0.5 min, and then quickly cool it to 40 °C in a cold water bath.

[0062] 2) Add the uniformly mixed anti-skid aggregate, stone chips, cement, and anti-icing agent to water, and stir at a stirring rate of 55 rpm for 20 s to obtain a uniformly mixed intermediate mixture.

[0063] 3) Add the cationic high-viscosity modified emulsified asphalt to the intermediate mixture, and stir at a stirring rate of 65 rpm for 25 s to obtain the anti-icing micro-surfacing material.

[0064] Example 3 This example provides an ultra-low temperature long-lasting self-melting ice asphalt mixture ultra-thin sealant material, and the raw material composition is as follows: 12% cationic high-viscosity modified emulsified asphalt, 74.5% anti-skid aggregate, 5.5% anti-icing agent, 3% stone chips, 1.5% cement, 3.5% water. The raw material composition of the cationic high-viscosity modified emulsified asphalt is 58% matrix asphalt, 3.5% linear low molecular weight SBS modifier, 1% aromatic hydrocarbon, 1% tackifier, 2% stabilizer, 1.5% emulsifier, 32% water, and 1% hydrochloric acid. The number average molecular weight of the linear low molecular weight SBS modifier is 60,000. The aromatic hydrocarbon is KQ-24 from Shandong Changtai Petrochemical Technology Co., Ltd., the tackifier is hydroxyethyl cellulose, and the emulsifier uses a quaternary ammonium salt cationic emulsifier. The matrix asphalt is 70# matrix asphalt. The stabilizer is rubber powder: sulfur with a mass ratio of 1:1. The hydrochloric acid is 36% industrial hydrochloric acid. The anti-icing agent contains volcanic rock powder with an adsorbed saturation amount of NaCl. The anti-skid aggregate is basalt. The maximum particle size of the stone chips is 5 mm. The gradation is the MS-3 standard gradation. The cement is ordinary Portland 425 cement.

[0065] This example also provides a preparation method for the above ultra-low temperature long-lasting self-melting ice asphalt mixture ultra-thin sealant material, and the steps are as follows: 1) Preparation of cationic high-viscosity modified emulsified asphalt: Prepare high-viscosity modified asphalt: Heat the matrix asphalt to 165 °C, then add the aromatic hydrocarbon and tackifier and stir for 35 ± 0.5 min, raise the temperature to 185 °C, add the modifier and stir for 1.5 ± 0.1 h, then perform high-speed shearing at 8000 r / min for 60 ± 0.5 min, add the stabilizer and stir for 35 ± 0.5 min to obtain high-viscosity modified asphalt (60 °C dynamic viscosity ≥ 60,000 Pa·s).

[0066] Prepare the soap solution: Heat the water to 55 °C, add hydrochloric acid and emulsifier in sequence under stirring conditions, and then adjust the pH value to 4.5 ± 0.2 with hydrochloric acid to obtain the soap solution.

[0067] High-temperature shearing and grinding: Mix the soap solution with the high-viscosity modified asphalt, perform colloid mill high-temperature shearing and grinding at 170 °C for 2 ± 0.5 min, and then quickly cool down to 40 °C in a cold water bath.

[0068] 2) Add the uniformly mixed anti-skid aggregate, stone chips, cement, and anti-icing agent to water, and stir at a stirring rate of 60 rpm for 20 s to obtain a uniformly mixed intermediate mixture.

[0069] 3) Add the cationic high-viscosity modified emulsified asphalt to the intermediate mixture, and stir at a stirring rate of 90 rpm for 30 s to obtain the anti-icing micro-surfacing material.

[0070] Example 4 This example provides a super-low-temperature long-lasting self-thawing ice asphalt mixture ultra-thin seal coat material. Using the same method as in Example 1, the difference is that the dosage of the thickening agent in the cationic high-viscosity modified emulsified asphalt raw material in step 1) is changed to 0.5%, the dosage of the SBS modifier is changed to 2.5%, the dosage of the matrix asphalt is changed to 59.5%, and the dynamic viscosity of the high-viscosity modified asphalt at 60 °C is 35000 Pa·s.

[0071] Example 5 This example provides a super-low-temperature long-lasting self-thawing ice asphalt mixture ultra-thin seal coat material. Using the same method as in Example 1, the difference is that the raw material composition of the super-low-temperature long-lasting self-thawing ice asphalt mixture ultra-thin seal coat material is 12% cationic high-viscosity modified emulsified asphalt, 72.5% anti-skid aggregate, 7% anti-icing agent, 3% stone chips, 1.5% cement, and 4% water.

[0072] Example 6 This example provides a super-low-temperature long-lasting self-thawing ice asphalt mixture ultra-thin seal coat material. Using the same method as in Example 1, the difference is that the raw material composition of the super-low-temperature long-lasting self-thawing ice asphalt mixture ultra-thin seal coat material is 10% cationic high-viscosity modified emulsified asphalt, 77.5% anti-skid aggregate, 5.5% anti-icing agent, 3% stone chips, 1.5% cement, and 2.5% water.

[0073] Test the mixable time, cohesion, wet wheel abrasion, width change rate of the rutting deformation test, compatibility grade value, texture depth, and freezing point of the self-thawing ice asphalt mixture ultra-thin seal coat materials of the test examples and comparative examples. The test results are shown in Table 1.

[0074] Table 1 Performance of different self-thawing ice asphalt mixture ultra-thin seal coat materials

[0075] The super-low-temperature long-lasting self-thawing ice asphalt mixture ultra-thin seal coat material provided by the present invention can improve the slurry viscosity and mixable time, and optimize the texture depth and texture of the micro-surfacing. After the mixture is paved and formed, observe the mixture. There are a small amount of salt crystals on the surface of the anti-icing mixture, which disappear immediately after driving. The performance indicators of the mixture are not much different from those without addition, and the anti-icing performance indicators meet the environmental requirements at -18 °C.

[0076] The present invention also tested the anti-shear effect of the self-melting ice asphalt mixture ultra-thin surface material under long-term rolling. The self-melting ice asphalt mixture ultra-thin surface material of Example 1 was compared with the ordinary cold-laid asphalt mixture. The test results of the self-melting ice asphalt mixture ultra-thin surface material of Example 1 after paving and after three months of driving are shown in Figure 1 and Figure 2 respectively (the ordinary cold-laid asphalt mixture is on the left lane, and Example 1 is on the right lane). The self-melting ice asphalt mixture ultra-thin surface material of the present invention has good anti-shear performance, and its performance remains consistent with that of the ordinary cold-laid asphalt mixture after three months of driving load, which well avoids the influence of adding a large amount of snowmelt agent on the performance of the mixture.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultra-thin seal coating material for self-melting ice asphalt mixture, characterized in that, It comprises the following raw materials in parts by weight: 8 - 14 parts of cationic high-viscosity modified emulsified asphalt, 66 - 84 parts of anti-skid aggregate, 5 - 8 parts of anti-icing agent, 0.5 - 5 parts of stone chips, 0.5 - 3 parts of cement, and 2 - 8 parts of water; the raw materials of the cationic high-viscosity modified emulsified asphalt include a modifier, a tackifier, a cationic emulsifier, and a stabilizer, the modifier is a linear low-molecular-weight SBS modifier, and the tackifier is an organic tackifier.

2. The self-melting ice asphalt mixture ultra-thin seal coat material according to claim 1, characterized in that The cationic high-viscosity modified emulsified asphalt is prepared from the raw materials of high-viscosity modified asphalt and soap solution. The raw materials of the high-viscosity modified asphalt include matrix asphalt, aromatic hydrocarbon, tackifier, modifier, and stabilizer. Preferably, the mass ratio of the matrix asphalt, aromatic hydrocarbon, tackifier, modifier, and stabilizer is 55 - 65:1 - 3:0.5 - 1.5:2.5 - 6:1 - 3; the raw materials of the soap solution include a cationic emulsifier, water, and hydrochloric acid. Preferably, the mass ratio of the cationic emulsifier, water, and hydrochloric acid is 2 - 2.5:30 - 38:1 - 3.

3. The self-thawing ice asphalt mixture ultra-thin seal coat material according to claim 2, characterized in that, The cationic high-viscosity modified emulsified asphalt comprises the following raw materials in mass content: 55% - 65% of matrix asphalt, 2.5% - 6% of modifier, 1% - 3% of aromatic hydrocarbon, 0.5% - 1.5% of tackifier, 1% - 3% of stabilizer, 1.2% - 2.5% of cationic emulsifier, 30% - 38% of water, and 1% - 3% of hydrochloric acid; Preferably, the number-average molecular weight of the modifier is 50,000 - 80,000; and / or, the stabilizer is selected from one or more of rubber powder, sulfur, and carbon black; and / or, the matrix asphalt is 70# matrix asphalt and / or 90# matrix asphalt; and / or, the aromatic hydrocarbon is rubber oil; and / or, the tackifier is hydroxyethyl cellulose and / or polyacrylamide; and / or, the cationic emulsifier is an amine-based cationic emulsifier, preferably quaternary ammonium salts and / or amides; and / or, the hydrochloric acid is 30% - 40% industrial hydrochloric acid.

4. The self-thawing ice asphalt mixture ultra-thin seal coat material according to claim 3, characterized in that, The 60°C dynamic viscosity of the high-viscosity modified asphalt is not less than 30,000 Pa·s; and / or, the pH value of the soap solution is 3 - 4.

5. The self-melting ice asphalt mixture ultra-thin sealant material according to any one of claims 1-4, characterized in that, The anti-icing agent comprises a porous powder material adsorbed with a saturated amount of salt compound. The salt compound is NaCl and / or CaCl2, and the porous powder material is volcanic rock powder.

6. The self-thawing ice asphalt mixture ultra-thin seal coat material according to any one of claims 1-5, characterized in that The anti-skid aggregate is basalt and / or diabase, and the particle size of the stone chips is 3 - 5 mm; and / or, the grading is MS-1 standard grading, MS-2 standard grading, or MS-3 standard grading, preferably MS-3 standard grading; and / or, the cement is ordinary Portland cement with a 28-day compressive strength of 32.5 - 52.5 MPa, preferably ordinary Portland 425 cement.

7. The self-thawing ice asphalt mixture ultra-thin seal coat material according to any one of claims 1-6, characterized in that, It uses the following raw materials in mass content: 8% - 14% of cationic high-viscosity modified emulsified asphalt, 66% - 84% of anti-skid aggregate, 5% - 8% of anti-icing agent, 0.5% - 5% of stone chips, 0.5% - 3% of cement, and 2% - 8% of water.

8. The preparation method of the self-deicing asphalt mixture ultra-thin seal coat material according to any one of claims 1-7, characterized in that, It includes: Mix the cationic high-viscosity modified emulsified asphalt, anti-skid aggregate, anti-icing agent, stone chips, cement, and water.

9. The preparation method according to claim 8, characterized in that, It includes: 1) Prepare the cationic high-viscosity modified emulsified asphalt; 2) Mix the anti-skid aggregate, stone chips, cement, anti-icing agent and water, and stir at a stirring rate of 50 - 60 rpm for 10 - 30 s to obtain an intermediate mixture. 3) Mix the cationic high-viscosity modified emulsified asphalt with the intermediate mixture, and stir at a stirring rate of 65 - 90 rpm, preferably 70 - 80 rpm, for 20 - 35 s, preferably 30 s. Preferably, it further includes paving and compaction. The paving temperature is preferably less than 10°C, and the compaction pressure is preferably 0.11 - 1.05 MPa.

10. The preparation method according to claim 8 or 9, characterized in that, The preparation of the cationic high-viscosity modified emulsified asphalt includes: 1) Prepare high-viscosity modified asphalt: Mix the base asphalt, aromatic hydrocarbon and tackifier at high temperature and stir, and then successively add the modifier and stabilizer under stirring conditions to obtain high-viscosity modified asphalt. 2) Prepare the soap solution: Mix water, hydrochloric acid and cationic emulsifier, and then adjust the pH value to obtain the soap solution. 3) High-temperature shearing and grinding: Mix the soap solution with the high-viscosity modified asphalt and perform high-temperature shearing and grinding. Preferably, the preparation of the cationic high-viscosity modified emulsified asphalt includes: 1) Prepare high-viscosity modified asphalt: Heat the base asphalt to 160 - 170°C, then add the aromatic hydrocarbon and tackifier and stir for 30 - 45 min, raise the temperature to 180 - 190°C, add the modifier and stir for 1.5 ± 0.5 h, then perform high-speed shearing at 8000 ± 1000 r / min for 50 - 70 min, add the stabilizer and stir for 30 - 45 min to obtain high-viscosity modified asphalt. 2) Prepare the soap solution: Heat water to 50 - 60°C, add hydrochloric acid and cationic emulsifier under stirring conditions, and then adjust the pH value to 4 - 5 with hydrochloric acid to obtain the soap solution. 3) High-temperature shearing and grinding: Mix the soap solution with the high-viscosity modified asphalt, perform colloid mill high-temperature shearing and grinding at 160 - 170°C for 1 - 3 min, and then quickly cool to 40 ± 5°C in a cold water bath.

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