High temperature resistant road asphalt and preparation method thereof

Abstract

The application relates to the technical field of asphalt, in particular to a high-temperature-resistant road asphalt and a preparation method thereof; the high-temperature-resistant road asphalt is prepared from the following raw materials in parts by weight: base asphalt 80-100 parts, a first extractive 8-10 parts, a second extractive 5-7 parts, a plasticizer 2-5 parts and a stabilizer 1-3 parts; in the application, the waste old firebrick extractive contains various high-temperature-resistant metal oxides and salts, such as magnesium oxide, calcium oxide and the like; the substances have high melting points; when the substances are added into the asphalt, the metal oxides and the salts can form stable high-temperature-resistant structures under high-temperature environments, play a role of skeleton support, limit the thermal motion of asphalt molecules, thereby improving the softening point of the asphalt and enhancing the anti-deformation capacity of the asphalt under high temperatures; in addition, the substances can also chemically react with acidic components in the asphalt to generate more stable compounds, and further improve the high-temperature stability of the asphalt.

Description

Technical Field

[0001] This invention relates to the field of asphalt technology, specifically to a high-temperature resistant road asphalt and its preparation method. Background Technology

[0002] High-grade roads in my country are characterized by heavy loads and high traffic frequency. Compared with ordinary gravel roads, asphalt roads have many advantages, such as improving driving stability and comfort, increasing vehicle speed, reducing fuel consumption, and significantly reducing transportation costs.

[0003] However, in existing technologies, commercially available road asphalt has a high degree of similarity in composition. Although it can be used in most road traffic scenarios, different geographical locations have different unique geographical environments and climatic conditions, resulting in special areas with consistently high temperatures. Common road asphalt has limited high-temperature resistance, and higher temperatures can cause the asphalt to soften and flow, thus affecting its performance in high-temperature areas. Based on this, the present invention provides a high-temperature resistant road asphalt and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a high-temperature resistant road asphalt and its preparation method. The high-temperature resistant road asphalt prepared by this invention has good high-temperature resistance and effectively improves the performance of high-temperature resistant road asphalt in high-temperature areas.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant road asphalt, composed of the following raw materials in parts by weight: 80-100 parts of base asphalt, 8-10 parts of first extract, 5-7 parts of second extract, 2-5 parts of plasticizer, and 1-3 parts of stabilizer.

[0006] Preferably, the base asphalt can be selected from at least one of petroleum asphalt, coal tar pitch and natural asphalt.

[0007] Preferably, the first extract is made from waste refractory bricks. The pretreatment method for the waste refractory bricks includes the following steps: the waste refractory bricks are fed into a crusher, crushed and passed through a 50-mesh sieve to obtain crushed material, which is then fed into a ball mill with a rotation speed of 300-500 r / min and a filling rate of (30-35)%. The material is continuously ground for 2-3 hours and passed through a 300-mesh sieve to obtain brick powder.

[0008] Preferably, the further processing method of the brick powder includes the following steps:

[0009] Step 1: Transfer the brick powder to an enamel-lined reactor, add hydrochloric acid solution, start the enamel-lined reactor, and gradually increase the temperature to (60-80)℃ at 200-300r / min, continue the treatment for 2-4h to obtain a mixed solution;

[0010] Step 2: The mixture obtained in Step 1 is transported to a plate and frame filter press. The filtration pressure is set at 0.4-0.6 MPa. The mixture is then pressed and the residue is removed to obtain the filtrate.

[0011] Step 3: Transfer the filtrate obtained in Step 2 to the reaction tank, add acid-base adjuster dropwise under stirring at 150-200 r / min to adjust the pH value to 8-10, let it stand for 3-5 h to obtain the precipitate;

[0012] Step 4: Transfer the precipitate obtained in Step 3 to a centrifuge and process it at 3000-4000 r / min for 10-15 min to obtain the precipitate. Wash it with deionized water to remove impurities, and then place it in a drying oven at 80-100℃ for 4-6 h to obtain the first extract, which is ready for use.

[0013] Preferably, in step 1, the mass ratio of brick powder to hydrochloric acid solution is 1:(5-8).

[0014] Preferably, the method for preparing the second extract includes the following steps:

[0015] Step 1: Select waste rice husks as raw materials, place them in a washing machine, set the speed to 50-100 r / min, and continue washing for 20-30 minutes. Repeat the washing 3-5 times, then transfer them to a drum dryer, set the temperature to 100-120℃, and continue drying for 1-2 hours to obtain dry rice husks.

[0016] Step 2: Add the dried rice husks to the pyrolysis furnace, heat to 400-500℃, heating rate (5-10)℃ / min, and pyrolyze at a constant temperature for 1-2 hours to obtain biochar;

[0017] Step 3: Add the biochar to a hammer mill, crush and grind it, and pass it through a 180-200 mesh sieve to obtain charcoal powder;

[0018] Step 4: Transfer the carbon powder to the reaction vessel, add hydrogen peroxide solution, set the stirring speed to 300-400 r / min, heat to 50-70℃, and keep it at that temperature for 1-2 hours to obtain the oxidizing liquid;

[0019] Step 5: Transfer the oxidation solution to a vacuum filter, set the vacuum degree to 0.06-0.08MPa, remove the liquid and transfer it to a washing tank. Under stirring conditions of 100-150r / min, wash repeatedly with deionized water 4-6 times to obtain the washed material.

[0020] Step 6: Place the washed material into a vacuum drying oven, set the vacuum degree to 0.01-0.03MPa, the temperature to 60-80℃, and the drying time to 3-5 hours to obtain the second extract, which is ready for use.

[0021] Preferably, in step four, the mass ratio of carbon powder to hydrogen peroxide solution is 1:(3-5).

[0022] Preferably, the plasticizer may be selected from at least one of dioctyl phthalate, epoxidized soybean oil, and tributyl citrate.

[0023] Preferably, the stabilizer may be selected from at least one of organotin compounds, calcium stearate, and dibasic lead phosphite.

[0024] Preferably, the high-temperature resistant road asphalt is prepared using the following method:

[0025] S1: Weigh the base asphalt as needed and heat it to 140℃. The base asphalt will become fluid. Use a mixing device with a speed of 400-600r / min to continuously mix the base asphalt.

[0026] S2: Weigh out the first extract, second extract, plasticizer and stabilizer as needed, and stir continuously at 200-300 r / min for 30-45 min to obtain a mixture;

[0027] S3: Add the mixture obtained in S2 to the base asphalt in S1, heat to 200-230℃, adjust the speed to 1200-1500r / min, and continue stirring for 2-3 hours;

[0028] S4: Use a high-speed shear emulsifier to shear the raw material in S3 for 25-30 minutes at a shear rate of 3500-4000 r / min. Then, set the speed to 700-900 r / min for mixing. Keep the temperature at 180℃ during mixing for 40-50 minutes. After mixing, the high-temperature resistant road asphalt is obtained.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. This invention uses waste refractory bricks to prepare a first extract. The waste refractory brick extract contains a variety of high-temperature resistant metal oxides and salts, such as magnesium oxide and calcium oxide. These substances have high melting points. When added to asphalt, under high-temperature conditions, these metal oxides and salts can form a stable high-temperature resistant structure, which acts as a skeleton support, restricts the thermal motion of asphalt molecules, thereby increasing the softening point of asphalt and enhancing its resistance to deformation at high temperatures. In addition, they can also react chemically with acidic components in asphalt to generate more stable compounds, further improving the high-temperature stability of asphalt.

[0031] 2. This invention prepares a second extract from waste rice husks. The main components of the rice husk extract are biochar and functional groups such as carboxyl and hydroxyl groups on its surface. Biochar has good thermal stability and is mainly composed of carbon elements. It can maintain a relatively stable structure at high temperatures. When the rice husk extract is added to asphalt, the biochar can be uniformly dispersed in the asphalt system to form a network-like structure, which enhances the cohesion of the asphalt and prevents the flow of asphalt molecules at high temperatures, thereby improving the high-temperature resistance of the asphalt. At the same time, the functional groups such as carboxyl and hydroxyl groups on the surface can form hydrogen bonds with asphalt molecules, increasing the intermolecular forces and making the asphalt more difficult to soften and deform at high temperatures.

[0032] 3. In this invention, the mixing of the first and second extracts produces a synergistic effect. On the one hand, metal ions can undergo ion exchange with the functional groups on the surface of biochar to form a more stable structure. For example, Ca²⁺ can react with carboxyl groups to form carboxylate complexes. The formation of such complexes further enhances the stability of the asphalt system. On the other hand, functional groups can undergo acid-base neutralization reactions with metal oxides and salts. For example, carboxyl groups react with calcium oxide to generate the corresponding carboxylate and water, thereby forming chemical bonds between the two extracts and binding them more tightly together to improve the high-temperature resistance of asphalt. In addition, the composite structure formed by the combination of the two can more effectively restrict the thermal motion of asphalt molecules, improve the softening point and high-temperature stability of asphalt, and reduce the risk of road damage such as rutting and swelling at high temperatures. Attached Figure Description

[0033] Figure 1 The invention proposes a flowchart for the preparation of the first extract of a high-temperature resistant road asphalt and its preparation method;

[0034] Figure 2 The invention proposes a flowchart for the preparation of a second extract of a high-temperature resistant road asphalt and its preparation method;

[0035] Figure 3 This invention proposes a high-temperature resistant road asphalt and its preparation method, including a flowchart of the high-temperature resistant road asphalt preparation process. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Example 1

[0038] This embodiment provides a high-temperature resistant road asphalt, which is composed of the following raw materials in parts by weight: 80 parts base asphalt, 8 parts first extract, 5 parts second extract, 2 parts plasticizer, and 1 part stabilizer.

[0039] Petroleum asphalt is selected as the base asphalt.

[0040] The first extract uses waste refractory bricks as raw material. The pretreatment method for waste refractory bricks includes the following steps: the waste refractory bricks are put into a crusher, crushed and passed through a 50-mesh sieve to obtain crushed material, which is then put into a ball mill with a rotation speed of 300 r / min and a filling rate of 30%. The material is continuously ground for 2 hours and then passed through a 300-mesh sieve to obtain brick powder.

[0041] The further processing method for brick powder includes the following steps:

[0042] Step 1: Transfer the brick powder to an enamel-lined reactor, add hydrochloric acid solution, start the enamel-lined reactor, gradually increase the temperature to 60℃ at 200r / min, and continue the treatment for 2h to obtain a mixed solution;

[0043] Step 2: The mixture obtained in Step 1 is transported to a plate and frame filter press, the filtration pressure is set at 0.4 MPa, and the mixture is filtered and the residue is removed to obtain the filtrate;

[0044] Step 3: Transfer the filtrate obtained in Step 2 to the reaction tank, add acid-base adjuster dropwise at 150 r / min to adjust the pH value to 8, let it stand for 3 h to obtain the precipitate;

[0045] Step 4: Transfer the precipitate obtained in Step 3 to a centrifuge and process it at 3000 r / min for 10 min to obtain the precipitate. Wash it with deionized water to remove impurities, and then place it in a drying oven at 80℃ for 4 h to obtain the first extract, which is ready for use.

[0046] In step 1, the mass ratio of brick powder to hydrochloric acid solution is 1:5.

[0047] The method for preparing the second extract includes the following steps:

[0048] Step 1: Select waste rice husks as raw materials, place them in a washing machine, set the speed to 50 r / min, and continue washing for 20 minutes. Repeat the washing 3 times, then transfer them to a drum dryer, set the temperature to 100℃, and continue drying for 1 hour to obtain dry rice husks.

[0049] Step 2: Add the dried rice husks to the pyrolysis furnace, heat to 400℃, heating rate 5℃ / min, and pyrolyze at a constant temperature for 1 hour to obtain biochar;

[0050] Step 3: Add the biochar to a hammer mill, crush and grind it, and pass it through a 180-mesh sieve to obtain charcoal powder;

[0051] Step 4: Transfer the carbon powder to the reaction vessel, add hydrogen peroxide solution, set the stirring speed to 300 r / min, heat to 50℃, and keep it at that temperature for 1 hour to obtain the oxidizing liquid;

[0052] Step 5: Transfer the oxidation solution to a vacuum filter, set the vacuum degree to 0.06MPa, remove the liquid, transfer it to a washing tank, and wash it repeatedly with deionized water 4 times under stirring at 100r / min to obtain the washed material;

[0053] Step 6: Place the washed material into a vacuum drying oven, set the vacuum degree to 0.01MPa, the temperature to 60℃, and the drying time to 3 hours to obtain the second extract, which is ready for use.

[0054] In step four, the mass ratio of carbon powder to hydrogen peroxide solution is 1:3.

[0055] The plasticizer selected is dioctyl phthalate.

[0056] Among them, organotin compounds are selected as stabilizers.

[0057] High-temperature resistant road asphalt is prepared using the following method:

[0058] S1: Weigh the base asphalt as needed and heat it to 140℃. The base asphalt will become fluid. Use a mixing device with a speed of 400r / min to continuously mix the base asphalt.

[0059] S2: Weigh out the first extract, second extract, plasticizer and stabilizer as needed, and stir continuously at 200 r / min for 30 min to obtain a mixture;

[0060] S3: Add the mixture obtained in S2 to the base asphalt in S1, heat to 200℃, adjust the speed to 1200r / min, and stir continuously for 2 hours;

[0061] S4: Use a high-speed shear emulsifier to shear the raw material in S3 for 25 minutes at a shear rate of 3500 r / min. Then, set the speed to 700 r / min for stirring. Keep the temperature at 180℃ for 40 minutes during the stirring process. After stirring, the high-temperature resistant road asphalt is obtained. Example 2

[0062] The high-temperature resistant road asphalt and its preparation method in this embodiment are basically the same as those in Example 1, except that the specific proportions of the raw materials and the preparation methods are different. The specific proportions of the raw materials and the preparation methods for the high-temperature resistant road asphalt in this embodiment are as follows:

[0063] A high-temperature resistant road asphalt is composed of the following raw materials in parts by weight: 90 parts base asphalt, 9 parts first extract, 6 parts second extract, 4 parts plasticizer, and 2 parts stabilizer.

[0064] Coal tar pitch is selected as the base asphalt.

[0065] The first extract uses waste refractory bricks as raw material. The pretreatment method for waste refractory bricks includes the following steps: the waste refractory bricks are put into a crusher, crushed and passed through a 50-mesh sieve to obtain crushed material, which is then put into a ball mill with a rotation speed of 400 r / min and a filling rate of 32%. The material is continuously ground for 2.5 hours and passed through a 300-mesh sieve to obtain brick powder.

[0066] The further processing method for brick powder includes the following steps:

[0067] Step 1: Transfer the brick powder to an enamel-lined reactor, add hydrochloric acid solution, start the enamel-lined reactor, gradually increase the temperature to 70℃ at 250r / min, and continue the treatment for 3h to obtain a mixed solution;

[0068] Step 2: The mixture obtained in Step 1 is transported to a plate and frame filter press, the filtration pressure is set at 0.5 MPa, and the mixture is filtered and the residue is removed to obtain the filtrate;

[0069] Step 3: Transfer the filtrate obtained in Step 2 to the reaction tank, add acid-base adjuster dropwise under stirring at 180 r / min to adjust the pH value to 9, let it stand for 4 h to obtain the precipitate;

[0070] Step 4: Transfer the precipitate obtained in Step 3 to a centrifuge and process it at 3500 r / min for 13 min to obtain the precipitate. Wash it with deionized water to remove impurities, and then place it in a drying oven at 90℃ for 5 h to obtain the first extract, which is ready for use.

[0071] In step 1, the mass ratio of brick powder to hydrochloric acid solution is 1:6.

[0072] The method for preparing the second extract includes the following steps:

[0073] Step 1: Select waste rice husks as raw materials, place them in a washing machine, set the speed to 80 r / min, and wash continuously for 25 minutes. Repeat the washing 4 times, then transfer them to a drum dryer, set the temperature to 110℃, and dry continuously for 1.5 hours to obtain dry rice husks.

[0074] Step 2: Add the dried rice husks to the pyrolysis furnace, heat to 450℃ at a heating rate of 8℃ / min, and pyrolyze at a constant temperature for 1.5h to obtain biochar;

[0075] Step 3: Add biochar to a hammer mill, crush, grind and pass through a 190-mesh sieve to obtain charcoal powder;

[0076] Step 4: Transfer the carbon powder to the reaction vessel, add hydrogen peroxide solution, set the stirring speed to 350 r / min, heat to 60℃, and keep it at that temperature for 1.5 h to obtain the oxidizing liquid;

[0077] Step 5: Transfer the oxidation solution to a vacuum filter, set the vacuum degree to 0.07MPa, remove the liquid, transfer it to a washing tank, and wash it repeatedly with deionized water 5 times under stirring at 120r / min to obtain the washed material;

[0078] Step 6: Place the washed material into a vacuum drying oven, set the vacuum degree to 0.02MPa, the temperature to 70℃, and the drying time to 4 hours to obtain the second extract, which is ready for use.

[0079] In step four, the mass ratio of carbon powder to hydrogen peroxide solution is 1:4.

[0080] Among them, epoxidized soybean oil was selected as the plasticizer.

[0081] Calcium stearate was chosen as the stabilizer.

[0082] High-temperature resistant road asphalt is prepared using the following method:

[0083] S1: Weigh the base asphalt as needed and heat it to 140℃. The base asphalt will become fluid. Use a mixing device with a speed of 500r / min to continuously mix the base asphalt.

[0084] S2: Weigh out the first extract, second extract, plasticizer and stabilizer as needed, and stir continuously at 250 r / min for 40 min to obtain a mixture;

[0085] S3: Add the mixture obtained in S2 to the base asphalt in S1, heat to 220℃, adjust the speed to 1300r / min, and continue stirring for 2.5h;

[0086] S4: The raw material in S3 is sheared for 28 minutes using a high-speed shear emulsifier at a shear rate of 3800 r / min. Then, it is stirred at a speed of 900 r / min. During the stirring process, the temperature is kept at 180℃ for 45 minutes. After stirring, the high-temperature resistant road asphalt is obtained. Example 3

[0087] The high-temperature resistant road asphalt and its preparation method in this embodiment are basically the same as those in Example 1, except that the specific proportions of the raw materials and the preparation methods are different. The specific proportions of the raw materials and the preparation methods for the high-temperature resistant road asphalt in this embodiment are as follows:

[0088] A high-temperature resistant road asphalt is composed of the following raw materials in parts by weight: 100 parts base asphalt, 10 parts first extract, 7 parts second extract, 5 parts plasticizer, and 3 parts stabilizer.

[0089] Natural asphalt is selected as the base asphalt.

[0090] The first extract uses waste refractory bricks as raw material. The pretreatment method for waste refractory bricks includes the following steps: the waste refractory bricks are put into a crusher, crushed and passed through a 50-mesh sieve to obtain crushed material, which is then put into a ball mill with a rotation speed of 500 r / min and a filling rate of 35%. The material is continuously ground for 3 hours and then passed through a 300-mesh sieve to obtain brick powder.

[0091] The further processing method for brick powder includes the following steps:

[0092] Step 1: Transfer the brick powder to an enamel-lined reactor, add hydrochloric acid solution, start the enamel-lined reactor, gradually increase the temperature to 80℃ at 300r / min, and continue the treatment for 4 hours to obtain a mixed solution;

[0093] Step 2: The mixture obtained in Step 1 is transported to a plate and frame filter press, the filtration pressure is set at 0.6 MPa, and the mixture is filtered and the residue is removed to obtain the filtrate;

[0094] Step 3: Transfer the filtrate obtained in Step 2 to the reaction tank, add acid-base adjuster dropwise at 200 r / min to adjust the pH value to 10, let it stand for 5 h to obtain the precipitate;

[0095] Step 4: Transfer the precipitate obtained in Step 3 to a centrifuge and process it at 4000 r / min for 15 min to obtain the precipitate. Wash it with deionized water to remove impurities, and then place it in a drying oven at 100℃ for 6 h to obtain the first extract, which is ready for use.

[0096] In step 1, the mass ratio of brick powder to hydrochloric acid solution is 1:8.

[0097] The method for preparing the second extract includes the following steps:

[0098] Step 1: Select waste rice husks as raw materials, place them in a washing machine, set the speed to 100 r / min, and wash continuously for 30 minutes. Repeat the washing 5 times, then transfer them to a drum dryer, set the temperature to 120℃, and dry continuously for 2 hours to obtain dry rice husks.

[0099] Step 2: Add the dried rice husks to the pyrolysis furnace, heat to 500℃ at a rate of 10℃ / min, and pyrolyze at a constant temperature for 2 hours to obtain biochar.

[0100] Step 3: Add the biochar to a hammer mill, crush and grind it, and pass it through a 200-mesh sieve to obtain charcoal powder;

[0101] Step 4: Transfer the carbon powder to the reaction vessel, add hydrogen peroxide solution, set the stirring speed to 400 r / min, heat to 70℃, and keep it at that temperature for 2 hours to obtain the oxidizing liquid;

[0102] Step 5: Transfer the oxidation solution to a vacuum filter, set the vacuum degree to 0.08MPa, remove the liquid, transfer it to a washing tank, and wash it repeatedly with deionized water 6 times under stirring at 150r / min to obtain the washed material;

[0103] Step 6: Place the washed material into a vacuum drying oven, set the vacuum degree to 0.03MPa, the temperature to 80℃, and the drying time to 5h to obtain the second extract, which is ready for use.

[0104] In step four, the mass ratio of carbon powder to hydrogen peroxide solution is 1:5.

[0105] Among them, tributyl citrate was selected as the plasticizer.

[0106] The stabilizer chosen is dibasic lead phosphite.

[0107] High-temperature resistant road asphalt is prepared using the following method:

[0108] S1: Weigh the base asphalt as needed and heat it to 140℃. The base asphalt will become fluid. Use a mixing device with a speed of 600r / min to continuously mix the base asphalt.

[0109] S2: Weigh out the first extract, second extract, plasticizer and stabilizer as needed, and stir continuously at 300 r / min for 45 min to obtain a mixture;

[0110] S3: Add the mixture obtained in S2 to the base asphalt in S1, heat to 230℃, adjust the speed to 1500r / min, and continue stirring for 3 hours;

[0111] S4: Use a high-speed shear emulsifier to shear the raw material in S3 for 30 minutes at a shear rate of 4000 r / min. Then, set the speed to 900 r / min for stirring. Keep the temperature at 180℃ for 50 minutes during the stirring process. After stirring, the high-temperature resistant road asphalt is obtained.

[0112] Comparative Example 1: The difference between this comparative example and Example 1 is that:

[0113] This comparative example does not contain the first extract.

[0114] Comparative Example 2: The difference between this comparative example and Example 1 is that:

[0115] This comparative example does not contain the second extract.

[0116] Comparative Example 3 differs from Example 1 in that:

[0117] This comparative example does not include the first and second extracts.

[0118] Comparative Example 4: The difference between this comparative example and Example 1 is that:

[0119] This comparative example does not contain plasticizers or stabilizers.

[0120] To more clearly illustrate the preparation method provided by the present invention, the above embodiments are described in detail. The test methods for various indicators of the high-temperature resistant road asphalt prepared in the embodiments and comparative examples are as follows:

[0121] Softening point: The high-temperature resistant road asphalt prepared in the examples and comparative examples was tested for softening point in accordance with the relevant provisions of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJE20).

[0122] Penetration: The high-temperature resistant road asphalt prepared in the examples and comparative examples was tested for penetration at 25°C in accordance with the relevant provisions of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJE20).

[0123] High temperature resistance: After drying, the high temperature resistant road asphalt prepared in the examples and comparative examples was placed in a high temperature environment of 80°C for 24 hours, and it was observed whether deformation occurred.

[0124] The obtained test data is recorded in the table below:

[0125]

[0126] By comparing the experimental data of the base asphalt, the examples, and the comparative examples in the table above, it can be clearly found that the high-temperature resistant road asphalt prepared in Examples 1-3 has a higher softening point, a lower penetration at 25°C, and no deformation after 24 hours in a high-temperature environment at 80°C. This indicates that adding the first extract and the second extract to the base asphalt can enhance the high-temperature resistance, viscosity, and softening point of the high-temperature resistant road asphalt.

[0127] A comparison of the experimental data of Examples 1-3 and Comparative Examples 1-4 with the base asphalt shows that the combination of the first extract and the second extract can enhance the high-temperature resistance of road asphalt.

[0128] A comparison of the experimental data from Examples 1-3 and Comparative Example 4 with the base asphalt reveals that the absence of plasticizers and stabilizers during the preparation of high-temperature resistant asphalt has a relatively low impact on the high-temperature resistance, viscosity, and softening point of the asphalt. This indicates that the high-temperature resistance, viscosity, and softening point of the prepared high-temperature resistant asphalt are mainly affected by the first extract and the second extract.

[0129] By comparing and analyzing the relevant data in the table, it can be seen that the high-temperature resistant road asphalt prepared by this invention not only has good high-temperature resistance, but also has a broader market prospect and is more suitable for promotion.

[0130] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0131] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-temperature resistant road asphalt, characterized in that: It is composed of the following raw materials in parts by weight: 80-100 parts base asphalt, 8-10 parts first extract, 5-7 parts second extract, 2-5 parts plasticizer, and 1-3 parts stabilizer; The first extract uses waste refractory bricks as raw materials. The pretreatment method of the waste refractory bricks includes the following steps: the waste refractory bricks are put into a crusher, crushed and passed through a 50-mesh sieve to obtain crushed material, which is then put into a ball mill with a rotation speed of 300-500 r / min and a filling rate of (30-35)%. The material is continuously ground for 2-3 hours and passed through a 300-mesh sieve to obtain brick powder. The further processing method for the brick powder includes the following steps: Step 1: Transfer the brick powder to an enamel-lined reactor, add hydrochloric acid solution, start the enamel-lined reactor, and gradually increase the temperature to (60-80)℃ at 200-300r / min, continue the treatment for 2-4h to obtain a mixed solution; Step 2: The mixture obtained in Step 1 is transported to a plate and frame filter press. The filtration pressure is set at 0.4-0.6 MPa. The mixture is then pressed and the residue is removed to obtain the filtrate. Step 3: Transfer the filtrate obtained in Step 2 to the reaction tank, add acid-base adjuster dropwise under stirring at 150-200 r / min to adjust the pH value to 8-10, let it stand for 3-5 h to obtain the precipitate; Step 4: Transfer the precipitate obtained in Step 3 to a centrifuge and process it at 3000-4000 r / min for 10-15 min to obtain the precipitate. Wash it with deionized water to remove impurities, and then place it in a drying oven at 80-100℃ for 4-6 h to obtain the first extract, which is ready for use. The method for preparing the second extract includes the following steps: Step 1: Select waste rice husks as raw materials, place them in a washing machine, set the speed to 50-100 r / min, and continue washing for 20-30 minutes. Repeat the washing 3-5 times, then transfer them to a drum dryer, set the temperature to 100-120℃, and continue drying for 1-2 hours to obtain dry rice husks. Step 2: Add the dried rice husks to the pyrolysis furnace, heat to 400-500℃, heating rate (5-10)℃ / min, and pyrolyze at a constant temperature for 1-2 hours to obtain biochar; Step 3: Add the biochar to a hammer mill, crush and grind it, and pass it through a 180-200 mesh sieve to obtain charcoal powder; Step 4: Transfer the carbon powder to the reaction vessel, add hydrogen peroxide solution, set the stirring speed to 300-400 r / min, heat to 50-70℃, and keep it at that temperature for 1-2 hours to obtain the oxidizing liquid; Step 5: Transfer the oxidation solution to a vacuum filter, set the vacuum degree to 0.06-0.08MPa, remove the liquid and transfer it to a washing tank. Under stirring conditions of 100-150r / min, wash repeatedly with deionized water 4-6 times to obtain the washed material. Step 6: Place the washed material into a vacuum drying oven, set the vacuum degree to 0.01-0.03MPa, the temperature to 60-80℃, and the drying time to 3-5 hours to obtain the second extract, which is ready for use.

2. The high-temperature resistant road asphalt according to claim 1, characterized in that, The base asphalt may be selected from at least one of petroleum asphalt, coal tar pitch and natural asphalt.

3. The high-temperature resistant road asphalt according to claim 1, characterized in that, In step 1, the mass ratio of brick powder to hydrochloric acid solution is 1:(5-8).

4. The high-temperature resistant road asphalt according to claim 1, characterized in that, In step four, the mass ratio of carbon powder to hydrogen peroxide solution is 1:(3-5).

5. The high-temperature resistant road asphalt according to claim 1, characterized in that, The plasticizer may be selected from at least one of dioctyl phthalate, epoxidized soybean oil, and tributyl citrate.

6. The high-temperature resistant road asphalt according to claim 1, characterized in that, The stabilizer may be selected from at least one of organotin compounds, calcium stearate, and dibasic lead phosphite.

7. The high-temperature resistant road asphalt according to any one of claims 1-6, characterized in that, Prepared using the following method: S1: Weigh the base asphalt as needed and heat it to 140℃. The base asphalt will become fluid. Use a mixing device with a speed of 400-600r / min to continuously mix the base asphalt. S2: Weigh out the first extract, second extract, plasticizer and stabilizer as needed, and stir continuously at 200-300 r / min for 30-45 min to obtain a mixture; S3: Add the mixture obtained in S2 to the base asphalt in S1, heat to 200-230℃, adjust the speed to 1200-1500r / min, and continue stirring for 2-3 hours; S4: Use a high-speed shear emulsifier to shear the raw material in S3 for 25-30 minutes at a shear rate of 3500-4000 r / min. Then, set the speed to 700-900 r / min for mixing. Keep the temperature at 180℃ during mixing for 40-50 minutes. After mixing, the high-temperature resistant road asphalt is obtained.

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