CN111377661B - Ultrathin asphalt mixture based on environment-friendly rubber powder and preparation method thereof - Google Patents
Ultrathin asphalt mixture based on environment-friendly rubber powder and preparation method thereof Download PDFInfo
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- CN111377661B CN111377661B CN202010207891.3A CN202010207891A CN111377661B CN 111377661 B CN111377661 B CN 111377661B CN 202010207891 A CN202010207891 A CN 202010207891A CN 111377661 B CN111377661 B CN 111377661B
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to an ultrathin asphalt mixture based on environment-friendly rubber powder and a preparation method thereof, wherein the ultrathin asphalt mixture comprises the following components in parts by weight: 80-95% of aggregate, 4-10% of mineral powder, 0.1-0.6% of fiber and 4-8% of environment-friendly rubber powder modified asphalt; wherein the grading type of the aggregate is improved AC-10, and the ratio of the environment-friendly rubber powder to the matrix asphalt in the environment-friendly rubber powder modified asphalt is 0.05-0.40. The environment-friendly rubber powder-based ultrathin asphalt mixture prepared by the invention has excellent comprehensive performance, greatly improved service performances such as rutting resistance, high temperature performance, water damage resistance, mechanical property, durability and the like, excellent low-temperature performance, strong self-cohesiveness, good water permeability resistance, higher cost performance, small harm to the health of construction operators and high environmental friendliness. The thickness of the prepared environment-friendly rubber powder ultrathin asphalt pavement can be 1.5-3.5cm, the construction cost is obviously reduced, the cost can be saved by more than 20%, the vehicle running noise is reduced, the cost performance is high, and the environment-friendly rubber powder ultrathin asphalt pavement has wide market application prospect.
Description
Technical Field
The invention relates to the field of road engineering materials, in particular to an ultrathin asphalt mixture based on environment-friendly rubber powder and a preparation method thereof.
Background
With the rapid development of highway construction in China, pavement road engineering maintenance projects are gradually increased, but maintenance funds are relatively in short supply, and new requirements are provided for asphalt pavement maintenance technologies. The preventive maintenance measures can treat early diseases of the pavement and increase the service durability of the pavement, and the maintenance method is an economic maintenance means. The ultra-thin overlay technology is a typical preventive maintenance measure, and compared with other preventive maintenance measures, the ultra-thin overlay technology has the advantages of good surface roughness, improved skid resistance, capability of being tightly combined with the original pavement, delay of the occurrence time of diseases, high construction speed, short development and traffic time, and outstanding performance economic advantages.
At present, in the field of ultrathin overlay, SBS modified asphalt, high-viscosity modified asphalt and the like are mostly adopted to prepare ultrathin asphalt mixtures in the prior art, but the cost (especially SBS modifier and high-viscosity modifier) is high, and the cost of the prepared ultrathin asphalt mixtures is also high. Moreover, due to the fact that SBS modified asphalt and high-viscosity modified asphalt are high in viscosity, the required mixing temperature is high under the condition of high mixing amount, stirring is continuously carried out by a stirring machine, energy is greatly consumed, and cost is increased.
The application technology of the waste rubber powder as a road material is mature, and the treatment process of the waste rubber powder is continuously developed and improved. At present, the environment-friendly rubber powder is an environment-friendly material with excellent performance, which is obtained by carrying out desulfurization and activation on waste rubber powder. Compared with the traditional waste rubber powder, the environment-friendly rubber powder has low sulfur content, high environment friendliness, high dissolving speed and good processability. Although the environment-friendly rubber powder is applied to the asphalt mixture at present, the problem to be solved is that how to apply the environment-friendly rubber powder to the ultrathin asphalt mixture because the ultrathin asphalt mixture has special requirements on asphalt so that the environment-friendly rubber powder modified asphalt meets the performance requirements of the ultrathin asphalt mixture.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an ultrathin asphalt mixture based on environment-friendly rubber powder and a preparation method thereof, wherein the ultrathin asphalt mixture has excellent pavement performance, the service performances of the mixture such as track resistance, high temperature performance, water damage resistance, mechanical property, durability and the like are greatly improved, the ultrathin asphalt mixture has excellent low-temperature performance, good water permeability resistance and excellent comprehensive performance, the cost of the asphalt mixture is obviously reduced, and the performance-price ratio is higher.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the ultrathin asphalt mixture based on the environment-friendly rubber powder is characterized by comprising the following components:
80-95% of aggregate, 4-10% of mineral powder, 0.1-0.6% of fiber and 4-8% of environment-friendly rubber powder modified asphalt.
The percentages are the mass percentages of the components relative to the total amount of the raw materials.
Preferably, the grading type of the aggregate is modified AC-10, and the specific grading composition of the modified AC-10 is as follows:
TABLE 1
Wherein the percentage is the mass percentage of the sieve pores passing through.
Preferably, the aggregate is conventional in the road engineering art, generally including coarse and fine aggregates. The coarse aggregate is broken stone with a nominal grain diameter of more than 2.36mm and a maximum nominal grain diameter of less than 9.5 mm. The fine aggregate is stone chips or sand with the particle size of less than 2.36 mm.
Preferably, the amount of the aggregate is preferably 81 to 92%.
Preferably, the mineral powder is conventional mineral powder in the field of road engineering, the mineral powder with the 0.075mm sieve pore passing rate of more than 80 percent, and is more preferably limestone powder, and the mineral powder plays a filling role in the ultrathin asphalt mixture.
Preferably, the amount of the mineral powder is 4-9%.
Preferably, the fibers are one or a mixture of more of polyester fibers, lignin fibers or basalt fibers, and the fibers play a role in adsorption, stabilization and multidirectional reinforcement in the ultrathin asphalt mixture, so that the flexibility of the mixture is improved, and the high-temperature and low-temperature performance of the mixture is enhanced.
Preferably, the amount of the fibers is preferably 0.2 to 0.6%.
Preferably, the ratio of the environment-friendly rubber powder to the matrix asphalt in the environment-friendly rubber powder modified asphalt is 0.05-0.40.
Preferably, the environment-friendly rubber powder modified asphalt is prepared by shearing, stirring and processing environment-friendly rubber powder and matrix asphalt at 165-190 ℃, wherein the ratio of the environment-friendly rubber powder to the matrix asphalt is 0.05-0.40, and the better ratio is 0.08-0.35.
Preferably, the environment-friendly rubber powder is rubber powder which is subjected to crushing, dehydration and desulfurization activation treatment. The sulfur content of the environment-friendly rubber powder is not more than 0.5%, the carbon black content is not less than 28%, the rubber hydrocarbon content is not less than 45%, and the tensile strength is not less than 4MPa. The sulfur is a main source of heated smell of the rubber powder and a main index of whether the rubber powder meets the environmental protection concept, the rubber hydrocarbon is a basic component of the natural rubber, the carbon black is an important factor influencing the performance of the rubber, and the tensile strength directly reflects the performance of the rubber. The invention restrains the sulfur content, the carbon black content, the rubber hydrocarbon content and the tensile strength in the environment-friendly rubber powder, and ensures that the performance of the environment-friendly rubber powder meets the requirements of the invention.
Preferably, the base asphalt is conventional base asphalt in the field of road engineering, and can be one or a mixture of 50# base asphalt, 70# base asphalt or 90# base asphalt meeting the technical requirements of JTG F40-2004 technical Specification for construction of road asphalt pavement of Ministry of transportation.
Preferably, the improved AC-10 grading is that a 7.2mm sieve pore is added between 4.75mm and 9.5mm sieve pores, so that the whole particle size distribution of the aggregate can be better controlled, the mixture can form an excellent grading structure, the environment-friendly rubber powder ultrathin asphalt mixture prepared by adopting the grading is reasonable in grading, and the excellent particle size distribution grading structure is easier to form.
Preferably, the preparation method of the ultrathin asphalt mixture based on the environment-friendly rubber powder is characterized by comprising the following steps of:
(1) Mixing the environment-friendly rubber powder and the matrix asphalt in proportion, and uniformly stirring and shearing to obtain a mixture A, namely environment-friendly rubber powder modified asphalt;
(2) Mixing the aggregate, the fibers and the mixture A in proportion, and uniformly stirring to obtain a mixture B;
(3) And (3) uniformly mixing the mineral powder and the mixture B to obtain the ultrathin asphalt mixture based on the environment-friendly rubber powder.
According to the invention, through the limitation of the parameters and the use amount of each raw material and the mutual coordination effect of the raw materials, the ultra-thin asphalt mixture road has excellent comprehensive performance, greatly improved service performances such as rutting resistance, high temperature performance, water damage resistance, mechanical property, durability and the like, excellent low temperature performance, strong self-cohesion, better anti-scattering performance, greatly improved water permeability coefficient and structural depth index, better road surface service performance and safer vehicle running. Compared with the traditional ultrathin asphalt mixture, the ultrathin asphalt mixture based on the environment-friendly rubber powder has higher cost performance, overcomes the defects of large smell, harm to human beings and environmental unfriendliness of the traditional rubber powder, and has small harm to the health of construction operators and high environmental friendliness.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by manufacturers, and are all conventional products available on the market. In the following examples and comparative examples, the aggregate, the mineral powder, the asphalt and the fiber all meet the requirements of JTG F40-2004 "technical Specification for construction of asphalt pavement for road engineering", standard of Ministry of transportation.
Example 1
1. Ultrathin asphalt mixture based on environment-friendly rubber powder
The ultrathin asphalt mixture based on the environment-friendly rubber powder comprises the following raw materials in parts by weight:
88.2 percent of aggregate, 6.5 percent of limestone mineral powder, 0.3 percent of basalt fiber and 5.0 percent of environment-friendly rubber powder modified asphalt.
The environment-friendly rubber powder modified asphalt is prepared by shearing, stirring and processing environment-friendly rubber powder and matrix asphalt at 180 ℃, wherein the ratio of the environment-friendly rubber powder to the matrix asphalt is 0.22:1. the base asphalt is Esso 70# base asphalt meeting the requirements of JTG F40-2004 technical Specification for construction of asphalt pavement for road engineering, the environment-friendly rubber powder is produced by Honghuo environmental protection science and technology limited in Jiangsu, the sulfur content is 0.35%, the carbon black content is 55%, the rubber hydrocarbon content is 46%, and the tensile strength is 6.1MPa.
Wherein, the aggregate, the limestone mineral powder and the basalt fiber all meet the technical requirements of JTG F40-2004 technical Specification for construction of asphalt pavement for highway engineering. The grading type of the aggregate is modified AC-10, and the specific grading composition is shown in Table 2.
2. Preparation method of ultrathin asphalt mixture based on environment-friendly rubber powder
The preparation method of the ultrathin asphalt mixture based on the environment-friendly rubber powder comprises the following steps:
(1) Mixing the environment-friendly rubber powder and the No. 70 matrix asphalt in proportion, and stirring and shearing uniformly to obtain a mixture A, namely environment-friendly rubber powder modified asphalt;
(2) Mixing the aggregate, the basalt fibers and the mixture A according to the proportion, and uniformly stirring to obtain a mixture B;
(3) And uniformly mixing the limestone mineral powder and the mixture B to obtain the ultrathin asphalt mixture based on the environment-friendly rubber powder.
The test pieces are molded according to the test methods of Marshall test, rutting test, kentucky scattering test, construction depth test, freezing-thawing splitting test and water seepage test in JTG E20-2011 road engineering asphalt and asphalt mixture test procedures, and the test results are shown in Table 3.
Example 2
The ultrathin asphalt mixture based on the environment-friendly rubber powder comprises the following raw materials in parts by weight:
87.8% of aggregate, 6.7% of limestone mineral powder, 0.3% of lignin fiber and 5.2% of environment-friendly rubber powder modified asphalt.
The environment-friendly rubber powder modified asphalt is prepared by shearing, stirring and processing environment-friendly rubber powder and matrix asphalt at 180 ℃, wherein the ratio of the environment-friendly rubber powder to the matrix asphalt is 0.27:1. the matrix asphalt is Shell No. 90 matrix asphalt meeting the requirements of JTG F40-2004 technical Specification for construction of asphalt pavements for road engineering, and the environment-friendly rubber powder is produced by Suzhou Runjie environmental-friendly new material, wherein the environment-friendly rubber powder is 0.41 percent of sulfur, 41 percent of carbon black, 39 percent of rubber hydrocarbon and 6.9MPa of tensile strength.
Wherein, the aggregate, the limestone mineral powder and the lignin fiber all meet the technical requirements of JTG F40-2004 technical Specification for construction of asphalt pavement for highway engineering. The grading type of the aggregate is modified AC-10, and the specific grading composition is shown in Table 2.
The raw materials and the components of the preparation method of the environment-friendly rubber powder-based ultrathin asphalt mixture are used as described above, and the steps are the same as those in example 1. The test pieces are molded according to the test methods of Marshall test, rutting test, kentucky scattering test, construction depth test, freezing-thawing splitting test and water seepage test in JTG E20-2011 road engineering asphalt and asphalt mixture test procedures, and the test results are shown in Table 3.
Comparative example 1
The comparative example is SBS modified asphalt ultrathin asphalt mixture, which comprises the following raw materials in parts by weight:
89.2% of aggregate, 5.5% of limestone mineral powder, 0.3% of basalt fiber and 5.0% of modified asphalt.
Wherein the modified asphalt is I-D SBS modified asphalt meeting the requirements of JTG F40-2004 technical Specification for construction of asphalt pavements in road engineering. The aggregate, the limestone mineral powder and the basalt fiber also meet the technical requirements of JTG F40-2004 technical Specification for construction of asphalt pavements for highway engineering. The specific grading composition of the above aggregates is shown in table 2.
The preparation method of the ultrathin asphalt mixture of the comparative example, the raw materials and the compositions were used as described above, and the procedure was the same as in example 1. The test pieces are molded according to the test methods of Marshall test, rutting test, kentucky scattering test, construction depth test, freezing-thawing splitting test and water seepage test in JTG E20-2011 road engineering asphalt and asphalt mixture test procedures, and the test results are shown in Table 3.
Comparative example 2
The ultrathin asphalt mixture of the comparative example comprises the following raw materials in parts by weight:
88.0 percent of aggregate, 7.5 percent of limestone mineral powder, 0.3 percent of basalt fiber and 4.2 percent of matrix asphalt.
The matrix asphalt is Esso 70# matrix asphalt meeting the requirements of JTG F40-2004 technical Specification for construction of asphalt pavements for highway engineering, wherein the aggregate, limestone mineral powder and lignin fiber all meet the technical requirements of JTG F40-2004 technical Specification for construction of asphalt pavements for highway engineering. The specific grading composition of the above aggregates is shown in table 2.
The preparation method of the ultrathin asphalt mixture of the comparative example, the raw materials and the compositions were used as described above, and the procedure was the same as in example 1. The test pieces are molded according to the test methods of Marshall test, rutting test, kentucky scattering test, construction depth test, freezing-thawing splitting test and water seepage test in JTG E20-2011 road engineering asphalt and asphalt mixture test procedures, and the test results are shown in Table 3.
Comparative example 3
The ultrathin asphalt mixture of the comparative example comprises the following raw materials in parts by weight:
85.4% of aggregate, 10.5% of limestone mineral powder, 0.3% of basalt fiber and 3.8% of environment-friendly rubber powder modified asphalt.
The environment-friendly rubber powder modified asphalt is prepared by shearing, stirring and processing environment-friendly rubber powder and matrix asphalt at 180 ℃, wherein the ratio of the environment-friendly rubber powder to the matrix asphalt is 0.22:1. the base asphalt is Esso 70# base asphalt meeting the requirements of JTG F40-2004 technical Specification for construction of asphalt pavement for road engineering, the environment-friendly rubber powder is produced by Honghuo environmental protection science and technology limited in Jiangsu, the sulfur content is 0.35%, the carbon black content is 55%, the rubber hydrocarbon content is 46%, and the tensile strength is 6.1MPa.
Wherein, the aggregate, the limestone mineral powder and the lignin fiber all meet the technical requirements of JTG F40-2004 technical Specification for construction of asphalt pavements in highway engineering. The specific grading composition of the above aggregates is shown in table 2.
The preparation method of the ultrathin asphalt mixture of the comparative example, the raw materials and the compositions were used as described above, and the procedure was the same as in example 1. The test pieces are molded according to the test methods of Marshall test, rutting test, kentucky scattering test, construction depth test, freezing-thawing splitting test and water seepage test in JTG E20-2011 road engineering asphalt and asphalt mixture test procedures, and the test results are shown in Table 3.
TABLE 2 grading compositions of the examples
TABLE 3 blend indices for the examples
The invention improves various performances of the ultrathin asphalt mixture through specific raw materials, specific dosage of the raw materials and mutual matching of the raw materials. As can be seen from Table 3, the Marshall stability of the examples is obviously improved compared with that of the comparative examples, which shows that the maximum load borne by the ultra-thin asphalt mixture based on the environment-friendly rubber powder is obviously improved, and the environment-friendly rubber powder ultra-thin asphalt mixture has better mechanical properties. The dynamic stability of the rutting test can reflect the high-temperature rutting resistance of the mixture, and the dynamic stability index of the embodiment is greatly improved compared with that of the comparative example, so that the ultrathin asphalt mixture has better rutting resistance. The residual Marshall stability and the freeze-thaw cleavage residual strength ratio are indexes reflecting the water loss resistance, and the residual Marshall stability and the freeze-thaw cleavage residual strength ratio of the embodiment are greatly improved, so that the ultra-thin asphalt mixture provided by the invention is proved to have more excellent water loss resistance. The kentucky fly-away test reflects the fly-away resistance of the asphalt mix. The scattering loss rate of the comparative example is greatly reduced, and the ultra-thin asphalt mixture provided by the invention is proved to have better scattering resistance. The technical indexes of the construction depth and the water permeability coefficient are greatly improved in the aspect of reflecting the apparent function of the mixture, and the water permeability coefficient of the embodiment is smaller, so that the ultrathin asphalt mixture has better apparent service performance. The ultrathin asphalt pavement prepared from the ultrathin asphalt mixture of the embodiment 1-2 can have the thickness of 1.5-2.5cm, excellent performance, low cost and high cost performance, and has wide market application value.
However, when no asphalt is introduced and the mixture ratio of each raw material is not within the specific range of the invention, the mixture of the comparative example has lower anti-rutting performance and water damage resistance, poorer structure depth and water seepage coefficient and poor comprehensive road performance.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. The ultrathin asphalt mixture based on the environment-friendly rubber powder is characterized by comprising the following components:
81-92% of aggregate, 4-10% of mineral powder, 0.1-0.6% of fiber and 4-8% of environment-friendly rubber powder modified asphalt; the mineral powder is limestone powder, the passing rate of a sieve pore with 0.075mm is more than 80%, and the using amount is 4-10%; the environment-friendly rubber powder modified asphalt is prepared by shearing, stirring and processing environment-friendly rubber powder and matrix asphalt, wherein the environment-friendly rubber powder is rubber powder which is subjected to crushing, dehydration treatment and desulfurization activation treatment; the sulfur content of the environment-friendly rubber powder is not more than 0.5%, the carbon black content is not less than 28%, the rubber hydrocarbon content is not less than 45%, and the tensile strength is not less than 4MPa;
the percentages are mass percentages of the components relative to the total amount of the raw materials; wherein the ratio of the environment-friendly rubber powder to the matrix asphalt in the environment-friendly rubber powder modified asphalt is 0.05-0.40; the base asphalt is one or a mixture of 50# base asphalt, 70# base asphalt or 90# base asphalt;
the specific grading composition of the aggregate is as follows:
wherein, the percentage is the mass percentage of the sieve pores passing through;
the preparation method of the ultrathin asphalt mixture based on the environment-friendly rubber powder comprises the following steps:
(1) Mixing the environment-friendly rubber powder and the matrix asphalt in proportion, and uniformly stirring and shearing to obtain a mixture A, namely environment-friendly rubber powder modified asphalt;
(2) Mixing the aggregate, the fibers and the mixture A in proportion, and uniformly stirring to obtain a mixture B;
(3) And uniformly mixing the mineral powder and the mixture B to obtain the ultrathin asphalt mixture based on the environment-friendly rubber powder.
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| CN111978744B (en) * | 2020-07-10 | 2022-08-16 | 苏州三创路面工程有限公司 | Design and preparation method of rubber powder modified high-viscosity asphalt drainage pavement mixture |
| CN112374806A (en) * | 2020-11-16 | 2021-02-19 | 中交建冀交高速公路投资发展有限公司 | Glass fiber rubber modified asphalt mixture and preparation method thereof |
| CN113372041A (en) * | 2021-07-13 | 2021-09-10 | 上海繁荣道路建设工程有限公司 | Asphalt mixture and preparation method thereof |
| CN114409309B (en) * | 2022-01-24 | 2022-11-01 | 中电建路桥集团有限公司 | Asphalt mixture suitable for low-temperature environment |
| CN114573273A (en) * | 2022-03-11 | 2022-06-03 | 中国路桥工程有限责任公司 | Anti-cracking asphalt mixture and processing method thereof |
| CN115710100B (en) * | 2022-12-10 | 2023-11-07 | 厦门市政沥青工程有限公司 | Micro-overlay asphalt mixture and preparation method thereof |
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| CN103709771B (en) * | 2013-12-27 | 2016-05-11 | 苏交科集团股份有限公司 | Stable type finished product warm mix rubber modified asphalt and preparation method thereof |
| CN104496285B (en) * | 2014-12-29 | 2016-10-26 | 北京市道路工程质量监督站 | A kind of rubber asphalt ultra-thin wearing layer compound and there is the rubber asphalt ultra-thin wearing layer of noise reduction antiskid |
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