CN111138123A - Prefabricated building block and production method thereof - Google Patents
Prefabricated building block and production method thereof Download PDFInfo
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- CN111138123A CN111138123A CN202010031140.0A CN202010031140A CN111138123A CN 111138123 A CN111138123 A CN 111138123A CN 202010031140 A CN202010031140 A CN 202010031140A CN 111138123 A CN111138123 A CN 111138123A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a prefabricated building block and a production method thereof, wherein the prefabricated building block is prepared from the following materials: 1-5 parts by weight of foamed asphalt; 1-10 parts by weight of asphalt reducing agent; 70-98 parts of waste asphalt mixture; 1-30 parts of new aggregate; 1-4 parts by weight of cement; 1 to 10 parts by weight of mineral powder. Compared with the prior art, the prefabricated building block provided by the invention adopts specific content components, better interaction is realized, the obtained prefabricated building block has good comprehensive road performance, and the prefabricated building block can be used as a sidewalk brick, a prefabricated block for engineering protection and the like; the production method provided by the invention can avoid the generation of asphalt smoke, has low energy consumption, realizes the mass utilization of the waste asphalt mixture, and develops a new technology and method for the utilization of the waste asphalt mixture.
Description
Technical Field
The invention relates to the technical field of road traffic building materials, in particular to a prefabricated building block and a production method thereof.
Background
At present, the highway construction in China has achieved huge achievements, and by the end of 2018, the total mileage of the highway in China reaches 485 kilometers, wherein the construction of the highway is developed rapidly, the total mileage reaches 14.3 kilometers, exceeds the United states, and is stably located in the world at the first place. The road surfaces of the highways mainly use asphalt road surfaces, the maintenance of the highways is the main work for maintaining the use of the highways along with the traffic of the highways, the service life of the highway road surfaces is 15 years, the service life of the common highways is 12 years, the overhaul mileage of the highways is nearly 1 kilometer each year, and the overhaul mileage of the common highways is 40.4 kilometers, so that a large amount of waste asphalt mixtures are generated each year, for example, Beijing, the waste asphalt mixtures generated each year reach 200 million tons, and the resources are wasted and the environment is polluted.
The application of the waste pavement materials is mainly as follows:
(1) and (4) carrying out field (plant) mixing heat regeneration. The field mixing hot regeneration technology is that the old asphalt concrete road surface is milled and transported to the asphalt mixture mixing field (plant), through crushing, sieving (if necessary), and according to the asphalt content, asphalt aging degree, aggregate gradation and other conditions in the old material, a certain amount of new aggregate, new asphalt, regenerant (if necessary) and the like are added for hot mixing, so that the mixture reaches each specified index, and the road surface is re-paved according to the construction process of the hot mixing asphalt mixture.
(2) Cold mixing and regeneration in field (factory). The cold-recycling technology for mixed asphalt road is a technology that old asphalt road is milled and transported to asphalt mixture mixing plant (factory), and then mixed with a certain amount of new aggregate, recycled binding material (emulsified asphalt, foamed asphalt, etc.) and recycling agent (if necessary) at normal temperature according to the indexes of asphalt content, asphalt aging degree, aggregate gradation, etc. in old material, so that the mixture reaches each specified index, and then re-paved according to the construction process of normal temperature asphalt concrete to form road base layer or lower surface layer.
However, in the prior art, the waste asphalt mixture is mainly applied to a pavement structure, so that the application range is small, and the utilization rate of the waste asphalt mixture is influenced.
Disclosure of Invention
In view of the above, the present invention aims to provide a precast block and a production method thereof, the production method provided by the present invention can avoid the generation of asphalt smoke, has low energy consumption, realizes the large-scale utilization of waste and old mixed materials, and the produced precast block has good comprehensive pavement performance and can be used as a pedestrian path brick, a precast block for engineering protection, etc.
The invention provides a prefabricated building block which is prepared from the following materials:
1-5 parts by weight of foamed asphalt;
1-10 parts by weight of asphalt reducing agent;
70-98 parts of waste asphalt mixture;
1-30 parts of new aggregate;
1-4 parts by weight of cement;
1 to 10 parts by weight of mineral powder.
Preferably, the foamed asphalt is formed by heating base asphalt to 130-190 ℃ and adding water; the expansion rate of the foamed asphalt is not less than 12 times, and the half-life period is not less than 10 seconds.
Preferably, the base asphalt is selected from one or more of No. 70 asphalt, No. 90 asphalt and SBS modified asphalt.
Preferably, the amount of the water is 0.3-4% of the mass of the base asphalt.
Preferably, the asphalt reducing agent is selected from one or more of an RA-1 type asphalt reducing agent, an RA-25 type asphalt reducing agent, an RA-75 type asphalt reducing agent, an RA-250 type asphalt reducing agent, and an RA-500 type asphalt reducing agent.
Preferably, the cement is selected from one or more of ordinary portland cement, slag portland cement, and pozzolanic portland cement.
Preferably, the mineral powder is fine powder with the granularity of below 0.075mm obtained by grinding hydrophobic stones.
The invention also provides a production method of the precast block in the technical scheme, which comprises the following steps:
a) mixing the asphalt reducing agent, the waste asphalt mixture, the new aggregate, the cement and the mineral powder for the first time, and then adding the foamed asphalt for the second time to obtain a foamed asphalt mixture;
b) and c) after the foamed asphalt mixture obtained in the step a) is molded, curing is carried out, and the prefabricated building block is obtained.
Preferably, the rotating speed of the first mixing in the step a) is 40r/min to 50r/min, and the time is 10s to 30 s; the rotation speed of the second mixing is 40 r/min-50 r/min, and the time is 30 s-50 s.
Preferably, the curing temperature in the step b) is 18-45 ℃ and the curing time is 5-10 d.
The invention provides a prefabricated building block and a production method thereof, wherein the prefabricated building block is prepared from the following materials: 1-5 parts by weight of foamed asphalt; 1-10 parts by weight of asphalt reducing agent; 70-98 parts of waste asphalt mixture; 1-30 parts of new aggregate; 1-4 parts by weight of cement; 1 to 10 parts by weight of mineral powder. Compared with the prior art, the prefabricated building block provided by the invention adopts specific content components, better interaction is realized, the obtained prefabricated building block has good comprehensive road performance, and the prefabricated building block can be used as a sidewalk brick, a prefabricated block for engineering protection and the like; the production method provided by the invention can avoid the generation of asphalt smoke, has low energy consumption, realizes the mass utilization of the waste asphalt mixture, and develops a new technology and method for the utilization of the waste asphalt mixture.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a prefabricated building block which is prepared from the following materials:
1-5 parts by weight of foamed asphalt;
1-10 parts by weight of asphalt reducing agent;
70-98 parts of waste asphalt mixture;
1-30 parts of new aggregate;
1-4 parts by weight of cement;
1 to 10 parts by weight of mineral powder.
In the invention, the precast block is made of materials of foamed asphalt, asphalt reducer, waste asphalt mixture, new aggregate, cement and mineral powder, preferably materials of foamed asphalt, asphalt reducer, waste asphalt mixture, new aggregate, cement and mineral powder.
In the present invention, the foamed asphalt is preferably formed by heating the base asphalt to 130 ℃ to 190 ℃ and then adding water. In the present invention, the base asphalt is preferably selected from one or more of No. 70 asphalt, No. 90 asphalt and SBS modified asphalt, and more preferably No. 70 asphalt or No. 90 asphalt. The source of the base asphalt in the present invention is not particularly limited, and commercially available products of the above-mentioned asphalt No. 70, asphalt No. 90 and SBS modified asphalt, which are well known to those skilled in the art, may be used.
In the present invention, the heating to 130 ℃ to 190 ℃ is a foaming temperature, and the foaming temperature is preferably 140 ℃ to 170 ℃, and more preferably 150 ℃ to 160 ℃.
In the present invention, the amount of water used is preferably 0.3% to 4%, more preferably 2.5% to 2.8% of the mass of the base asphalt.
In the present invention, the expanded asphalt preferably has an expansion ratio of not less than 12 times, more preferably 13 to 14 times, and a half-life of not less than 10 seconds, more preferably 15 seconds.
In the present invention, the precast block includes 1 to 5 parts by weight of foamed asphalt.
In the present invention, the asphalt reducing agent is preferably selected from one or more of the group consisting of an asphalt reducing agent of RA-1 type, an asphalt reducing agent of RA-25 type, an asphalt reducing agent of RA-75 type, an asphalt reducing agent of RA-250 type, and an asphalt reducing agent of RA-500 type. The source of the asphalt reducing agent is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the present invention, the asphalt reducing agent can improve the aged asphalt properties. In the present invention, the precast block includes 1 to 10 parts by weight of an asphalt reducing agent.
The source of the waste asphalt mixture is not particularly limited, and the waste pavement materials well known to those skilled in the art are adopted. In the invention, the prefabricated building block comprises 70-98 parts by weight of waste asphalt mixture, preferably 70-75 parts by weight.
The present invention is not particularly limited in kind and source of the novel aggregate, and commercially available products for use as aggregates, which are well known to those skilled in the art, may be used. In a preferred embodiment of the invention, the fresh aggregate is stone chips; in another preferred embodiment of the present invention, the new aggregate is 5: 19 and 5-10 mm of broken stone and stone chips. In the present invention, the precast block includes 1 to 30 parts by weight of a fresh aggregate, preferably 19 to 24 parts by weight.
In the present invention, the cement is preferably selected from one or more of ordinary portland cement, slag portland cement, and pozzolan portland cement, and more preferably ordinary portland cement. In the invention, the initial setting time of the cement is more than 3h, and the final setting time is preferably more than 6 h. The source of the cement is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the present invention, the precast block includes 1 to 4 parts by weight of cement, preferably 1.5 parts by weight.
In the invention, the mineral powder is preferably fine powder with the granularity of less than 0.075mm, which is obtained by grinding hydrophobic stone materials; the hydrophobic stones include, but are not limited to, limestone, magma, and the like; in a preferred embodiment of the invention, the hydrophobic stone is selected from limestone. In the present invention, the precast block includes 1 to 10 parts by weight of ore powder, preferably 4.5 parts by weight.
The prefabricated building block provided by the invention adopts specific content components, realizes better interaction, has good comprehensive road performance, and can be used as a pedestrian path brick, a prefabricated block for engineering protection and the like.
The invention also provides a production method of the precast block in the technical scheme, which comprises the following steps:
a) mixing the asphalt reducing agent, the waste asphalt mixture, the new aggregate, the cement and the mineral powder for the first time, and then adding the foamed asphalt for the second time to obtain a foamed asphalt mixture;
b) and c) after the foamed asphalt mixture obtained in the step a) is molded, curing is carried out, and the prefabricated building block is obtained.
Firstly, mixing an asphalt reducing agent, a waste asphalt mixture, new aggregates, cement and mineral powder for the first time, and then adding foamed asphalt for the second time to obtain a foamed asphalt mixture. In the invention, the asphalt reducing agent, the waste asphalt mixture, the new aggregate, the cement, the mineral powder and the foamed asphalt are the same as those in the technical scheme, and are not described again.
In the present invention, the first mixing and the second mixing are performed by a mixer known to those skilled in the art. In the present invention, the first mixing process preferably includes:
and pouring the waste asphalt mixture and the new aggregate into a mixer, adding cement, mineral powder and an asphalt reducing agent, and mixing to complete the first mixing process. In the invention, the rotating speed of the first mixing is preferably 40 r/min-50 r/min, and is realized by adopting a stirring paddle; the time for the first mixing is preferably 10s to 30s, more preferably 30 s.
In the invention, the second mixing mode is preferably a mode of mixing the sprayed foamed asphalt, and is realized by butting a mixer and a foaming device together. In the invention, the rotation speed of the second mixing is preferably 40 r/min-50 r/min, and is realized by adopting a stirring paddle; the time for the second mixing is preferably 30s to 50s, more preferably 30 s.
In the invention, the process of obtaining the foamed asphalt mixture adopts the mixing of the waste asphalt mixture and the foamed asphalt at normal temperature, and the whole process is carried out at normal temperature; the volume of the foamed asphalt adopted by the invention is increased by more than 12 times (the expansion rate is not less than 12 times), the viscosity of the foamed asphalt is obviously reduced, the foamed asphalt can be uniformly mixed at normal temperature, asphalt smoke generated in the production process is avoided, the energy consumption for manufacturing the asphalt mixture is reduced, meanwhile, the foamed asphalt and the asphalt in the waste asphalt mixture are wrapped on the surface of the mixture together under the action of an asphalt reducing agent to form an asphalt film, the asphalt mixture with better performance is formed after water is volatilized, compared with the conventional asphalt mixture, the compacting operation can be completed at normal temperature, and the prefabricated building block with good comprehensive road performance is obtained through health maintenance, so that the foamed asphalt is applied to pedestrian road bricks, prefabricated blocks for engineering protection and the like.
After the foamed asphalt mixture is obtained, the obtained foamed asphalt mixture is molded and then is cured to obtain the prefabricated building block. In the present invention, the forming process preferably includes:
pouring the obtained foamed asphalt mixture into a mold of a prefabricated building block, and molding by using a pressure molding machine; the purpose of the shaping is to obtain a shaped part. In a preferred embodiment of the invention, the forming is static pressure forming; in another preferred embodiment of the invention, the forming is by vibro-compaction.
In the present invention, the curing process is preferably carried out in a curing chamber well known to those skilled in the art; the curing temperature is preferably 18-45 ℃, and more preferably 40 ℃; the curing time is preferably 5d to 10d, and more preferably 7 d.
The production method provided by the invention can avoid the generation of asphalt smoke, has low energy consumption, realizes the mass utilization of the waste asphalt mixture, and develops a new technology and method for the utilization of the waste asphalt mixture.
The invention provides a prefabricated building block and a production method thereof, wherein the prefabricated building block is prepared from the following materials: 1-5 parts by weight of foamed asphalt; 1-10 parts by weight of asphalt reducing agent; 70-98 parts of waste asphalt mixture; 1-30 parts of new aggregate; 1-4 parts by weight of cement; 1 to 10 parts by weight of mineral powder. Compared with the prior art, the prefabricated building block provided by the invention adopts specific content components, better interaction is realized, the obtained prefabricated building block has good comprehensive road performance, and the prefabricated building block can be used as a sidewalk brick, a prefabricated block for engineering protection and the like; the production method provided by the invention can avoid the generation of asphalt smoke, has low energy consumption, realizes the mass utilization of the waste asphalt mixture, and develops a new technology and method for the utilization of the waste asphalt mixture.
To further illustrate the present invention, the following examples are provided for illustration. The cement used in the following examples of the present invention is ordinary portland cement, the asphalt reducing agent used is an RA-25 type asphalt reducing agent, and the used mineral powder is fine powder with a particle size of below 0.075mm, which is obtained by grinding limestone.
Example 1
The technical indexes of the raw materials are as follows:
the basic properties of Liaoning Cunning No. 90 asphalt are shown in Table 1.
TABLE 1 basic Properties of Liaoning Cuo No. 90 asphalt used in example 1 of the present invention
| Technical index | Panjin 90# asphalt | Technical requirements | Test method |
| Penetration (25 ℃ C.)/0.1mm | 85.2 | 80-100 | T 0604 |
| Softening point/. degree.C | 53 | >45 | T 0606 |
| Ductility (15 ℃) per cm | >100 | >100 | T 0605 |
Adding 3.1kg of Liaoning Cunning No. 90 asphalt into a foaming device, heating, adding water, and performing a foaming test to obtain foamed asphalt; the specific test conditions, parameters and results are summarized in Table 2.
TABLE 2 summary of specific test conditions, parameters and results for foamed bitumen of inventive example 1
By analyzing and calculating the data in table 2, the foamed asphalt adopted in the embodiment 1 of the invention under the conditions and parameters of the foaming temperature of 160 ℃ and the water consumption of 2.5 percent is specifically as follows: the swelling ratio was 14 times and the half-life was 15 s.
The gradation of the used waste asphalt mixture (taken from a certain highway maintenance engineering site), stone chips (new aggregate), mineral powder and cement is shown in table 3.
TABLE 3 gradation of old and useless asphalt mixture, new aggregate, ore powder and cement used in example 1 of the present invention
The production method comprises the following steps:
(1) firstly, butting a mixer and a foaming device together so as to directly spray foamed asphalt into a mixing pot; and then starting a mixer, pouring 75kg of waste asphalt mixture and 19kg of new aggregate into the mixer, adding 1.5kg of cement, 4.5kg of mineral powder and 1kg of asphalt reducing agent, mixing for 30s at the rotating speed of 50r/min, spraying foamed asphalt into a mixing pot, and mixing for 30s to obtain the foamed asphalt mixture.
(2) Pouring the foamed asphalt mixture obtained in the step (1) into a mold of a prefabricated building block, and performing vibration compaction molding by using a pressure molding machine, wherein the vibration compaction frequency is 30Hz, the static pressure is 108kPa, and the vibration compaction time is 180 s; and then laterally placing the formed part and the test mold in a curing room at 40 ℃ for curing to constant weight for 7d, and demolding to obtain the prefabricated building block.
The performance test of the precast block provided by the embodiment 1 of the invention is carried out, and the results are shown in tables 4-6.
Table 4 static modulus of restitution test results for precast blocks provided in example 1 of the present invention
Table 5 splitting strength test results of the precast block provided in example 1 of the present invention
Table 6 compression strength test results for precast blocks provided in example 1 of the present invention
Example 2
The technical indexes of the raw materials are as follows:
the basic properties of Liaoning Cunning No. 70 asphalt are shown in Table 7.
TABLE 7 basic Properties of Liaoning Cuo No. 70 asphalt used in example 2 of the present invention
| Technical index | Panjin 70# asphalt | Technical requirements | Test method |
| Penetration (25 deg.C)/0.1 mm | 71.0 | 60-80 | T 0604 |
| Softening point/. degree.C | 46 | >44 | T 0606 |
| Ductility (15 ℃) per cm | >100 | >100 | T 0605 |
Adding 4.3kg of Liaoning Cunning No. 70 asphalt into a foaming device, heating, adding water, and performing a foaming test to obtain foamed asphalt; the specific test conditions, parameters and results are summarized in Table 8.
TABLE 8 summary of specific test conditions, parameters and results for foamed bitumen in inventive example 2
By analyzing and calculating the data of table 8, the foamed asphalt adopted in the embodiment 2 of the invention under the conditions and parameters that the foaming temperature is 150 ℃ and the water consumption is 2.8 percent is specifically as follows: the swelling ratio was 13 times and the half-life was 15 s.
The used waste asphalt mixture (taken from a certain expressway maintenance engineering site in Jilin province) has the mass ratio of 5: the grading of 19 crushed stone and stone dust (new aggregate) of 5-10 mm, ore powder and cement is shown in table 9.
TABLE 9 gradation of old and useless asphalt mixture, new aggregate, ore powder and cement used in example 2 of the present invention
The production method comprises the following steps:
(1) firstly, butting a mixer and a foaming device together so as to directly spray foamed asphalt into a mixing pot; and then starting a mixer, pouring 70kg of waste asphalt mixture and 24kg of new aggregate into the mixer, adding 1.5kg of cement, 4.5kg of mineral powder and 8.6kg of asphalt reducing agent, mixing for 30s at the rotating speed of 50r/min, spraying foamed asphalt into a mixing pot, and mixing for 30s to obtain the foamed asphalt mixture.
(2) Pouring the foamed asphalt mixture obtained in the step (1) into a mold of a prefabricated building block, and carrying out static pressure forming by using a pressure forming machine, wherein the density of the static pressure mixture is determined by adopting a compaction test, and a static pressure forming test piece is formed according to the maximum dry density by considering 98% compactness; and then laterally placing the formed part and the test mold in a curing room at 40 ℃ for curing to constant weight for 7d, and demolding to obtain the prefabricated building block.
The performance test of the precast block provided by the embodiment 2 of the invention is carried out, and the results are shown in tables 10-12.
Table 10 static modulus of restitution test results for precast blocks provided in example 2 of the present invention
Table 11 splitting strength test results of precast blocks provided in embodiment 2 of the present invention
Table 12 compression strength test results for precast blocks provided in example 2 of the present invention
Experimental results show that the prefabricated building blocks provided by the embodiments 1-2 of the invention have good comprehensive road performance, and can be used as pedestrian path bricks, prefabricated blocks for engineering protection and the like; the production method provided by the invention can avoid the generation of asphalt smoke, has low energy consumption, realizes the mass utilization of the waste asphalt mixture, and develops a new technology and method for the utilization of the waste asphalt mixture.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A precast block is made from materials comprising the following components:
1-5 parts by weight of foamed asphalt;
1-10 parts by weight of asphalt reducing agent;
70-98 parts of waste asphalt mixture;
1-30 parts of new aggregate;
1-4 parts by weight of cement;
1 to 10 parts by weight of mineral powder.
2. The precast block according to claim 1, wherein the foamed asphalt is formed by heating base asphalt to 130-190 ℃ and adding water; the expansion rate of the foamed asphalt is not less than 12 times, and the half-life period is not less than 10 seconds.
3. The precast block according to claim 2, wherein the base asphalt is selected from one or more of No. 70 asphalt, No. 90 asphalt and SBS modified asphalt.
4. The precast block according to claim 2, wherein the amount of water is 0.3 to 4% by mass of the matrix asphalt.
5. The precast block according to claim 1, wherein the asphalt reducing agent is selected from one or more of a type RA-1 asphalt reducing agent, a type RA-25 asphalt reducing agent, a type RA-75 asphalt reducing agent, a type RA-250 asphalt reducing agent, and a type RA-500 asphalt reducing agent.
6. The precast block according to claim 1, wherein the cement is selected from one or more of ordinary portland cement, slag portland cement, and pozzolanic portland cement.
7. The precast block according to claim 1, wherein the ore powder is fine powder with a particle size of 0.075mm or less, which is obtained by grinding hydrophobic stone materials.
8. A method of producing a precast block according to any one of claims 1 to 7, comprising the steps of:
a) mixing the asphalt reducing agent, the waste asphalt mixture, the new aggregate, the cement and the mineral powder for the first time, and then adding the foamed asphalt for the second time to obtain a foamed asphalt mixture;
b) and c) after the foamed asphalt mixture obtained in the step a) is molded, curing is carried out, and the prefabricated building block is obtained.
9. The production method according to claim 8, wherein the rotation speed of the first mixing in step a) is 40r/min to 50r/min for 10s to 30 s; the rotation speed of the second mixing is 40 r/min-50 r/min, and the time is 30 s-50 s.
10. The production method according to claim 8, wherein the curing temperature in the step b) is 18-45 ℃ and the curing time is 5-10 d.
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