CN113480238A

CN113480238A - Anti-freezing asphalt mixture and preparation method thereof

Info

Publication number: CN113480238A
Application number: CN202110815912.4A
Authority: CN
Inventors: 庞亚婷
Original assignee: Taiyuan Rongtai Road Building Material Co ltd
Current assignee: Taiyuan Rongtai Road Building Material Co ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2021-10-08

Abstract

The application relates to the field of road materials, and particularly discloses an anti-freezing asphalt mixture and a preparation method thereof. An anti-freezing asphalt mixture is prepared from the following raw materials in parts by weight: 280 parts of 170-280 parts of aggregate, 40-70 parts of mineral powder, 150 parts of asphalt and 30-60 parts of anti-freezing agent; the anti-freezing agent is prepared from the following raw materials in parts by weight: 10-26 parts of organic salt, 5-15 parts of volcanic rock particles, 25-75 parts of slow release agent and 1-5 parts of coating agent. The preparation method comprises the following steps: and uniformly mixing the aggregate, the mineral powder and the anti-freezing agent, adding the mixture into molten asphalt, and uniformly mixing to obtain the anti-freezing asphalt mixture. The application discloses anti-freezing asphalt mixture, it has the effectual advantage of anti-freezing.

Description

Anti-freezing asphalt mixture and preparation method thereof

Technical Field

The application relates to the field of road materials, in particular to an anti-freezing asphalt mixture and a preparation method thereof.

Background

The asphalt mixture is a composite material, mainly composed of asphalt, coarse aggregate, fine aggregate and mineral powder, and paving a road surface with the asphalt mixture is a common road surface form in China.

In the early winter or the winter of the afterwinter, the temperature is changed alternately, the snowfall on the surface of the road surface is gradually melted under the action of the load of the vehicle, thin ice is easily formed under the action of the negative temperature, and the skid resistance of the road surface is rapidly reduced. The ice and snow cause the adhesion coefficient of the tires of the vehicle to be greatly reduced, and the operation stability and the safety of the vehicle are seriously influenced. Therefore, the road surface needs to be subjected to anti-freezing treatment.

At present, two main methods for removing ice on roads are provided, firstly, after snow on the roads is frozen, the ice on the roads is removed by methods of mechanical clearing, snow melting agent spreading and the like, but the methods have the defects of low efficiency, high cost, environmental pollution and the like; the other is that an anti-icing agent is added into the pavement material to reduce the freezing point of the pavement material so as to inhibit the pavement from icing, so that the later-stage deicing cost can be greatly reduced, and the anti-icing agent is more and more widely applied.

The anti-freezing agent is mostly the anti-freezing agent of salt type, and under the vehicle load, the salinity in the admixture releases from the capillary space of mixture, reduces the freezing point of ice, plays anti-freezing effect, but discovers in the use, and the anti-freezing effect of current anti-freezing agent is not especially ideal.

Disclosure of Invention

In order to reduce the damage to the environment, the application provides an anti-freezing asphalt mixture and a preparation method thereof.

In a first aspect, the application provides an anti-freezing asphalt mixture, which adopts the following technical scheme:

an anti-freezing asphalt mixture is prepared from the following raw materials in parts by weight: 280 parts of 170-280 parts of aggregate, 40-70 parts of mineral powder, 150 parts of asphalt and 30-60 parts of anti-freezing agent;

the anti-freezing agent is prepared from the following raw materials in parts by weight: 10-26 parts of organic salt, 5-15 parts of volcanic rock particles, 25-75 parts of slow release agent and 1-5 parts of coating agent.

By adopting the technical scheme, most of the salt-storage anti-freezing agents are mainly inorganic salts such as sodium chloride, calcium chloride and potassium chloride, and the reason that the anti-freezing effect is poor is that on one hand, under the action of road vehicle load and dynamic water pressure, a salt can quickly flow out along with water, so that the waste of the salt is caused, the content of the salt playing the anti-freezing effect is reduced, and the anti-freezing effect is weakened; on the other hand, these inorganic salts contain chloride ions, which may cause environmental pollution, corrode reinforcing steel materials, etc., and in order to reduce the environmental pollution, the amount of the inorganic salts is reduced, thereby reducing the anti-freezing effect.

In this application, organic salt adsorbs in the volcanic rock granule, and the retarder cladding is outside the volcanic rock granule, and the coating agent wraps the volcanic rock granule again, and the retarder cooperates with the coating agent and forms one deck hydrophobic film and isolated protection film on the surface of volcanic rock granule, reduces the absorption of volcanic rock granule to moisture, reduces the release rate of salinization thing in the volcanic rock granule, reduces the invalid release of salinization thing, improves anti-freezing effect. In addition, the organic salt is used for preparing the anti-freezing agent, and the organic salt does not contain components such as chloride ions which pollute the environment, so that the addition amount of a salt compound can be increased to a certain extent, the anti-freezing effect is ensured, the environmental protection is facilitated, and the damage of the use of the anti-freezing agent to the environment is reduced.

Preferably, the feed additive is prepared from the following raw materials in parts by weight: 190-260 parts of aggregate, 45-60 parts of mineral powder, 170-230 parts of asphalt and 35-50 parts of anti-freezing agent;

the anti-freezing agent is prepared from the following raw materials in parts by weight: 12-20 parts of organic salt, 6-10 parts of volcanic rock particles, 30-50 parts of slow release agent and 2-4 parts of coating agent.

By adopting the technical scheme, the proportion of each raw material in the asphalt mixture and the proportion of the raw materials in the anti-freezing agent are further optimized, and the anti-freezing effect of the asphalt mixture is improved.

Preferably, the particle size of the volcanic rock particles is 1-3 mm.

By adopting the technical scheme, the anti-freezing agent is added into the asphalt mixture as a raw material, the particle size of volcanic rock particles is limited, the particles are added as fine aggregate, the density of the asphalt mixture can be improved, the porosity is reduced, and the road performances such as cracking resistance and the like of the asphalt mixture are improved.

Preferably, the volcanic rock particles are modified volcanic rock particles, and the modification method comprises the following steps: the volcanic rock particles are calcined at the temperature of 750-850 ℃ and then cooled to room temperature.

By adopting the technical scheme, the volcanic particles are calcined, so that the accumulated desorption diameter of the volcanic particles is obviously increased, the surface area of the volcanic particles is also obviously increased, the modified volcanic has higher conductivity, the adsorption capacity on organic salt is enhanced, the content of the organic salt in the asphalt mixture is improved, and the anti-freezing performance is improved.

Preferably, the organic salt is sodium formate.

By adopting the technical scheme, the sodium formate is matched with the volcanic rock particles, the slow release agent and the coating agent, so that the anti-freezing effect is better.

Preferably, the sustained-release agent is prepared by mixing the following components in a weight ratio of 1: (4-7) sodium dodecylbenzenesulfonate and span 80.

By adopting the technical scheme, the sodium dodecyl benzene sulfonate is an anionic surfactant, the span 80 is a nonionic surfactant, and the sodium dodecyl benzene sulfonate and the nonionic surfactant are matched to form a hydrophobic film on the surface of volcanic rock particles, so that the hydrophobic effect is better, and the slow release property of the organic salt is improved.

Preferably, the composite material also comprises 10-18 parts by weight of carbon fibers.

By adopting the technical scheme, the carbon fibers are distributed in the asphalt mixture in a disorderly direction to form a three-dimensional network structure, aggregate, asphalt, anti-freezing agent particles and the like are pulled, and the improvement of pavement performances such as cracking resistance of the asphalt mixture is facilitated.

Preferably, the preparation method of the anti-freezing agent comprises the following steps:

1) mixing volcanic rock particles with an organic salt saturated solution, and then drying to prepare a salinized substance carrier;

2) mixing the salinization carrier obtained in the step 1) with a sustained-release agent solution, and then drying to obtain a substance A;

3) and mixing the substance A with a coating agent, and drying to obtain the anti-freezing agent.

By adopting the technical scheme, the volcanic rock particles adsorb the organic salt, so that the organic salt is filled in the volcanic rock particles, then the sustained-release agent forms a hydrophobic film on the volcanic rock particles, and the coating agent forms a protective film outside the hydrophobic film, so that the anti-freezing agent particles are prepared, and the sustained-release property of the organic salt is improved.

In a second aspect, the application provides a preparation method of an anti-freezing asphalt mixture, which adopts the following technical scheme:

the preparation method of the anti-freezing asphalt mixture comprises the following steps:

s1, uniformly mixing the raw materials except asphalt in parts by weight to obtain a mixture A;

s2, weighing the asphalt according to the parts by weight, heating to 145-180 ℃, continuously stirring, adding the mixture A into the asphalt, and uniformly mixing to obtain the asphalt mixture.

By adopting the technical scheme, the raw materials except the asphalt are mixed firstly, so that the anti-icing agent particles and the aggregate are fully mixed, and the uniformity of the dispersion of the anti-icing agent in the asphalt mixture is improved.

In summary, the present application has the following beneficial effects:

1. as the volcanic rock particles adsorb the organic salt, and then a hydrophobic film and a protective film isolating film are formed outside the volcanic rock particles, the slow release property of the organic salt is improved, so that the anti-freezing property of the asphalt mixture is improved, after the prepared asphalt mixture is subjected to rutting test at the dynamic stability for 2000 times and is washed by flowing water for 72 hours, the freezing point of the prepared asphalt mixture is (-27.3) DEG C to (-24.4) DEG C, the ice melting rate of the asphalt mixture is 27.44-31.92%, and the anti-freezing property of the asphalt mixture is excellent.

2. According to the application, the calcined and modified volcanic rock particles are preferably adopted, so that the adsorption effect of the volcanic rock particles on organic salt particles is improved, the freezing point of the prepared asphalt mixture is (-27.3) DEG C to (-26.5) DEG C after the dynamic stability rut test is carried out for 2000 times and flowing water is flushed for 72 hours, the ice melting rate is 29.96-30.92%, and the anti-freezing performance of the asphalt mixture is further improved.

Detailed Description

The present application will be described in further detail with reference to examples.

Preparation examples of starting materials and intermediates

Raw materials

The aggregate comprises coarse aggregate which is broken stone and has the particle size of 10-15 mm; the particle size of the artificial sand is 2.5-5 mm;

the mineral powder is secondary mineral powder;

the asphalt is petroleum asphalt;

the organic salt can be sodium formate, potassium formate, sodium acetate, and is available from Shandong Fengtai chemical technology Co., Ltd;

sodium dodecyl benzene sulfonate, available from chemical ltd, qianji, denna;

span 80, available from north Heibei Runshou Biotech limited;

the coating agent is hexadecanol, purchased from Nanjing Yunbo chemical Co., Ltd;

commercially available anti-icing agents are available from the firm of south-of-the-jeans, inc.

Preparation example

Preparation example 1

The preparation method of the modified volcanic rock particles comprises the following steps:

calcining the volcanic rock particles at 750 ℃, and then cooling to room temperature to obtain the modified volcanic rock particles, wherein the particle size of the volcanic rock is 1-3 cm.

Preparation examples 2 to 5

The calcination temperatures different from those in preparation 1 were 800 deg.C, 850 deg.C, 700 deg.C, and 900 deg.C, respectively.

Preparation example 6

The preparation method of the anti-freezing agent comprises the following steps:

1) weighing 10kg of sodium formate, dissolving in water to prepare a saturated sodium formate aqueous solution, weighing 15kg of volcanic rock particles, mixing with the saturated sodium formate aqueous solution, stirring for 5 hours at 25 ℃, and then drying in vacuum to constant weight at 100 ℃ to obtain a salt carrier, wherein the particle size of the volcanic rock is 1-3 cm;

2) dissolving 5kg of sodium dodecyl benzene sulfonate and 20kg of span 80 in ethanol, stirring for 0.5h at 65 ℃ to prepare a slow release agent solution, mixing the hydrochloride carrier obtained in the step 1) with the slow release agent solution, stirring for 5h, and then drying in vacuum at 100 ℃ to constant weight to obtain a substance A;

3) weighing 5kg of hexadecanol, dissolving in benzene, preparing a coating agent solution, mixing the substance A obtained in the step 2) with the coating agent solution, and then drying in vacuum at 100 ℃ to constant weight to obtain the anti-freezing ice agent.

Preparation examples 7 to 10

Different from the preparation example 6, the mixture ratio of the raw materials is different, and the details are shown in the table 1.

TABLE 1 PREPARATION EXAMPLES 6-10 raw material compounding ratio Table (kg)

	Sodium formate	Volcanic rock particles	Sodium dodecyl benzene sulfonate	Span 80	Cetyl alcohol
						Preparation example 6	10	15	5	20	5
Preparation example 7	12	10	6	24	4
						Preparation example 8	16	8	8	32	3
Preparation example 9	20	6	10	40	2
						Preparation example 10	26	5	15	60	1

Preparation example 11

Unlike preparation example 8, the particle size of volcanic rock was 5-8 cm.

Preparation examples 12 to 13

In contrast to preparation example 8, sodium formate was replaced with potassium formate and sodium acetate, respectively, in equal amounts.

Preparation examples 14 to 18

In contrast to preparation 8, the modified volcanic rock particles from preparations 1-5 were each replaced with the same amount of the volcanic rock particles.

Preparation examples 19 to 23

Different from the preparation example 16, the mixture ratio of the sodium dodecyl benzene sulfonate and the span 80 is different, and the details are shown in the table 2.

TABLE 2 sustained-release agent compounding ratio (kg) in preparation example 16 and preparation examples 19 to 23

	Preparation example 16	Preparation example 19	Preparation example 20	Preparation example 21	Preparation example 22	Preparation example 23
							Sodium dodecyl benzene sulfonate	8	5	6.5	35	0	40
Span 80	32	35	33.5	5	40	0

Preparation example 24

1) weighing 10kg of sodium formate, dissolving in water to prepare a saturated sodium formate aqueous solution, weighing 15kg of volcanic rock particles, mixing with the saturated sodium formate aqueous solution, stirring for 5 hours at 25 ℃, and then drying in vacuum to constant weight at 100 ℃ to prepare a salinized substance carrier;

2) dissolving 5kg of sodium dodecyl benzene sulfonate and 20kg of span 80 in ethanol, stirring for 0.5h at 65 ℃ to prepare a slow release agent solution, mixing the hydrochloride carrier obtained in the step 1) with the slow release agent solution, stirring for 5h, and then drying in vacuum at 100 ℃ to constant weight to obtain the anti-freezing ice agent.

Preparation example 25

1) weighing 10kg of sodium formate, 5kg of sodium dodecyl benzene sulfonate and 20kg of span 80, mixing, and granulating;

2) drying the particles obtained in the step 1) at 100 ℃ in vacuum to constant weight to obtain a substance A;

Examples

Example 1

An anti-freezing asphalt mixture, which is prepared by the following steps:

s1, uniformly mixing the raw materials except the asphalt in parts by weight to obtain a mixture A, wherein the anticoagulant comes from preparation example 6;

s2, weighing the asphalt according to the parts by weight, heating to 145 ℃, continuously stirring, adding the mixture A into the asphalt, and uniformly mixing to obtain an asphalt mixture.

Examples 2 to 9

The difference from the example 1 is the raw material ratio, which is detailed in table 3.

TABLE 3 raw material proportioning Table (kg) for examples 1-9

	Aggregate material	Mineral powder	Asphalt	Anti-freezing agent
					Example 1	170	70	150	60
Example 2	190	60	170	60
					Example 3	225	52	200	60
Example 4	260	45	230	60
					Example 5	280	40	250	60
Example 6	225	52	200	50
					Example 7	225	52	200	42
Example 8	225	52	200	35
					Example 9	225	52	200	30

Examples 10 to 11

Unlike example 7, the heating temperature of the asphalt in S2 was 165 ℃ and 180 ℃.

Examples 12 to 28

In contrast to example 7, anticoagulants were obtained from preparative examples 7-23, respectively.

Examples 29 to 31

Unlike example 25, the raw materials further included 10kg, 14kg, and 18kg of carbon fibers, respectively.

Comparative example

Comparative example 1

The anti-icing agent in this application was replaced with a commercially available anti-icing agent.

Comparative example 1

In contrast to example 3, the sodium formate was replaced by an equal amount of sodium chloride.

Comparative example 2

In contrast to example 3, the anti-freezing agent was obtained from preparative example 24.

Comparative example 3

In contrast to example 3, the anti-freezing agent was obtained from preparation example 25.

Performance test

Detection method/test method

1) The crack resistance of the asphalt mixture is tested by a low-temperature bending trabecula test method, firstly, a 5 cm-thick asphalt mixture test block is formed by a wheel rolling method, the asphalt mixture test block is cut into a prism trabecula test piece with the size of 250 cmx 30 cmx 35cm and the span of 200mm, the trabecula test piece is loaded, and the bending strain of the trabecula in damage is measured.

2) Testing the anti-freezing performance of the asphalt mixture:

firstly, after the asphalt mixture is made into a test piece, a dynamic stability rut test is adopted for 2000 times, and the road surface is used for simulating the action of vehicle load; then the test piece is flushed for 72h with flowing water with the flow rate of 100m³The pressure is 3bar, so as to simulate the pressure of the road surface driven water; and then draining the moisture on the surface of the test piece, and drying for 24 hours at the temperature of 60 ℃ to prepare a test block.

And testing the freezing temperature of the surface of the anti-icing asphalt mixture by a steady-state cooling method, spraying water on the surface of the test block, placing the asphalt mixture block in a low-temperature environment, and measuring the temperature of the surface of the asphalt mixture block when the surface is frozen.

The ice melting performance of the anti-icing asphalt mixture is tested through an ice melting test, ice blocks with certain mass are placed on a test block, the ice melting test is carried out in an environment of-5 ℃, and the ice melting rate of 2 hours, namely the ice block mass loss rate, is used as an evaluation index, namely the ice melting rate.

The results of the performance measurements are shown in Table 4.

TABLE 4 Performance test results

	Freezing temperature (. degree.C.)	Ice melting rate (100%)	Bending strain (mu epsilon)
				Example 1	-24.6	27.68	3035.5
Example 2	-25.0	28.16	3058.3
				Example 3	-25.3	28.52	3097.9
Example 4	-24.8	27.92	3031.9
				Example 5	-24.4	27.44	3032.1
Example 6	-25.2	28.40	3084.7
				Example 7	-25.5	28.76	3124.3
Example 8	-25.3	28.52	3097.9
				Example 9	-25.0	28.16	3058.3
Example 10	-25.1	28.28	3071.5
				Example 11	-24.9	28.04	3045.1
Example 12	-26.1	29.48	3203.5
				Example 13	-26.3	29.72	3229.9
Example 14	-25.9	29.24	3177.1
				Example 15	-25.7	29.00	3150.7
Example 16	-26.0	29.36	3090.3
				Example 17	-25.9	29.24	3177.1
Example 18	-26.1	29.48	3203.5
				Example 19	-26.9	30.44	3309.1
Example 20	-26.6	30.08	3269.5
				Example 21	-27.3	30.92	3361.9
Example 22	-26.7	30.20	3282.7
				Example 23	-26.5	29.96	3256.3
Example 24	-27.1	30.68	3335.5
				Example 25	-27.6	31.28	3401.5
Example 26	-26.3	29.72	3229.9
				Example 27	-25.4	28.64	3111.1
Example 28	-25.7	29.00	3150.7
				Example 29	-27.7	31.40	3614.7
Example 30	-27.8	31.52	3627.9
				Example 31	-27.6	31.28	3601.5
Comparative example 1	-18.5	23.85	3007.5
				Comparative example 2	-21.5	25.64	3050.5
Comparative example 3	-17.5	25.30	3010.3
				Comparative example 4	-19.2	24.80	3005.8

By combining the examples 1 to 31 with the comparative example 1 and combining the table 4, it can be seen that the icing temperature of the asphalt mixtures prepared in the examples 1 to 31 is lower than that of the comparative example 1, the ice melting rate of the asphalt mixtures prepared in the examples 1 to 31 is higher than that of the comparative example 1, and the anti-icing and ice-melting long-term effects of the asphalt mixtures prepared in the examples 1 to 31 are better; the bending tensile strain of the asphalt mixtures prepared in examples 1 to 31 is higher than that of comparative examples 1 to 3, which shows that the asphalt mixtures prepared in examples 1 to 31 have better low-temperature bending performance. And the commercial anti-icing agent contains chloride ions, so that a great damage effect is generated on the environment.

By combining examples 1-5 and table 4, it can be seen that the raw material ratio in example 3 is better by controlling the parameter of the anti-freezing agent to be unchanged and changing the ratio of other raw materials in the asphalt mixture.

By combining the examples 3, 17-18 and the comparative examples 2-4, and by combining the table 4, it can be seen that the anti-icing and de-icing durability and the low-temperature bending performance of the asphalt mixtures prepared in the examples 3 and 17-18 are better than those of the comparative examples 2-4, which indicates that the anti-icing effect of the anti-icing agent prepared by combining the organic salt with the volcanic rock particles, the slow release agent and the coating agent is better for the asphalt mixtures, probably because the organic salt is adsorbed in the volcanic rock particles, the slow release agent is coated outside the volcanic rock particles, and the coating agent is further used for coating the volcanic rock particles, so that the release of the organic salt in the mixing process can be reduced, and the anti-icing effect of the asphalt mixtures can be ensured.

By combining the examples 3 and 6-9 and combining the table 4, it can be seen that the anti-icing and ice-melting effects and the low-temperature bending performance of the prepared asphalt mixture are better by controlling the mixture ratio of other raw materials in the asphalt mixture to be unchanged, changing the mixing amount of the anti-icing agent and changing the performance of the asphalt mixture and the mixture ratio of the anti-icing agent to other raw materials in the example 7.

When the asphalt mixture of example 13 is better in anti-icing performance, it can be seen from the combination of example 7 and examples 12 to 15, and table 4, that the raw material ratio for preparing the anti-icing agent of preparation example 8 is better.

It can be seen by combining examples 13 and 16 and table 4 that the anti-freezing performance of the asphalt mixture in example 13 is better, and the low-temperature bending performance of the asphalt mixture in example 13 is obviously better than that in example 16, which is probably because the anti-freezing agent is used as fine aggregate in the asphalt mixture, the void ratio of the asphalt mixture can be reduced, so that the asphalt mixture is more compact, and the anti-freezing performance and the low-temperature bending performance of the asphalt mixture can be improved.

Combining example 13 with examples 17-18, and combining table 4, it can be seen that the anti-freezing performance of the asphalt mixture in example 13 is better, which indicates that the anti-freezing agent prepared by combining sodium formate with volcanic rock particles, sustained release agent and coating agent has better anti-freezing effect on the asphalt mixture.

Combining example 13 with examples 19-23, and combining table 4, it can be seen that the anti-freezing performance of the asphalt mixture in examples 19-23 is better than that of example 13, wherein the anti-freezing performance of the asphalt mixture in example 21 is better, which indicates that the modified volcanic rock particles can improve the anti-freezing performance of the anti-freezing agent, and the modification method of the volcanic rock particles in preparation example 3 is better; this is probably because the specific surface area of the volcanic rock particles is increased by calcining the volcanic rock particles, and the adsorption effect of the volcanic rock particles on organic salts is improved, thereby improving the anti-freezing property thereof.

In combination with examples 21 and 24-28, and in combination with table 4, it can be seen that the ratio of sodium dodecylbenzenesulfonate to span 80 has an effect on the anti-freezing performance of the asphalt mixture, wherein the anti-freezing performance of the asphalt mixture in example 25 is better, which may be due to the coordination of the nonionic surfactant and the anionic surfactant, and the slow-release effect on the organic salt is improved.

Combining example 25 with examples 29-31 and combining table 4, it can be seen that the anti-freezing performance of the asphalt mixture in examples 29-31 is equivalent to that of example 25, but the low-temperature bending performance of the asphalt mixture in examples 29-31 is significantly improved, probably because the carbon fibers reinforce the bonding strength between the raw materials in the asphalt mixture, and the anti-cracking performance of the asphalt concrete is improved.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The anti-freezing asphalt mixture is characterized by being prepared from the following raw materials in parts by weight: 280 parts of 170-280 parts of aggregate, 40-70 parts of mineral powder, 150 parts of asphalt and 30-60 parts of anti-freezing agent;

2. The anti-freezing asphalt mixture according to claim 1, characterized in that: the composition is prepared from the following raw materials in parts by weight: 190-260 parts of aggregate, 45-60 parts of mineral powder, 170-230 parts of asphalt and 35-50 parts of anti-freezing agent;

3. The anti-freezing asphalt mixture according to claim 1, characterized in that: the particle size of the volcanic rock particles is 1-3 mm.

4. The anti-freezing asphalt mixture according to claim 3, characterized in that: the volcanic rock particles are modified volcanic rock particles, and the modification method comprises the following steps: the volcanic rock particles are calcined at the temperature of 750-850 ℃ and then cooled to room temperature.

5. The anti-freezing asphalt mixture according to claim 1, characterized in that: the organic salt is sodium formate.

6. The anti-freezing asphalt mixture according to claim 1, characterized in that: the sustained release agent is prepared from the following components in a weight ratio of 1: (4-7) sodium dodecylbenzenesulfonate and span 80.

7. The anti-freezing asphalt mixture according to claim 1, characterized in that: it also comprises 10-18 parts of carbon fiber by weight.

8. The anti-freezing asphalt mixture according to claim 1, characterized in that: the preparation method of the anti-freezing agent comprises the following steps:

9. The method for preparing an anti-freezing asphalt mixture as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps: