CN111233376B - Asphalt concrete formula suitable for high-altitude cold regions - Google Patents
Asphalt concrete formula suitable for high-altitude cold regions Download PDFInfo
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- CN111233376B CN111233376B CN202010170292.9A CN202010170292A CN111233376B CN 111233376 B CN111233376 B CN 111233376B CN 202010170292 A CN202010170292 A CN 202010170292A CN 111233376 B CN111233376 B CN 111233376B
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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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- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The application belongs to the technical field of asphalt mixtures, and particularly relates to an asphalt concrete formula suitable for high-altitude cold regions. Asphalt concrete is widely applied in pavement construction and forms various national standards for standard construction. However, in cold areas at high altitude such as Tibet, asphalt concrete pavements produced according to the previous operating specifications crack seriously, and the temperature shrinkage can not meet the requirements. The application provides an asphalt concrete formula suitable for high-altitude cold regions, which consists of aggregates, mineral powder and asphalt, and the application reduces the passing rate of fine aggregates by adjusting the gradation of the mineral materials in the asphalt concrete formula, and selects the lower limit of the gradation envelope curve required by the specification; meanwhile, the ratio of the using amount of the mineral powder to the using amount of the asphalt is reduced, the using amount of the mineral powder is reduced, the purpose of increasing the void ratio of the asphalt concrete pavement after construction is achieved, the temperature shrinkage performance of the asphalt concrete pavement is improved, the cracking rate of the asphalt concrete pavement is reduced, and the purpose of the application is achieved.
Description
Technical Field
The application relates to the technical field of asphalt mixtures, in particular to an asphalt concrete formula suitable for high-altitude cold regions.
Background
Asphalt concrete (Bituminous concrete) is commonly called as asphalt concrete, and is a mixture prepared by manually selecting mineral aggregates with a certain gradation composition, such as crushed stone or crushed gravel, stone chips or sand, mineral powder and the like, and mixing the mineral aggregates with a certain proportion of road asphalt material under strictly controlled conditions. Asphalt concrete is widely applied in pavement construction, and a considerable part of asphalt concrete technology is mature at present and is formulated as national standard or industry standard.
However, in cold areas at high altitude such as Tibet, according to the previous operating specifications, the asphalt concrete mixing ratio controlled by the porosity upper limit is adopted, and the using amount ratio of the mineral powder to the asphalt is 1.0-1.2, so that the pavement is seriously cracked, and the temperature shrinkage of the asphalt concrete pavement cannot meet the requirements.
Therefore, an improved asphalt concrete formula is urgently needed, which is suitable for the climate characteristics of high-altitude cold regions and provides good temperature shrinkage so as to reduce the cracking rate of asphalt concrete pavements.
Disclosure of Invention
The application provides an asphalt concrete formula suitable for high-altitude cold regions, and aims to solve the problem that the conventional asphalt concrete formula for paving a pavement in the high-altitude cold regions is high in cracking rate.
The technical scheme adopted by the application is as follows:
an asphalt concrete formula suitable for high-altitude cold regions comprises aggregate, mineral powder and asphalt, wherein:
the aggregate is divided into fine aggregate and coarse aggregate, the grain size of a boundary line of the fine aggregate and the coarse aggregate is set as a, if the grain size of the aggregate is less than or equal to a, the aggregate is the fine aggregate, if the grain size of the aggregate is more than a, the aggregate is the coarse aggregate, and the value range of a is as follows: a is more than or equal to 2.3mm and less than or equal to 2.4 mm;
setting the mass percentage of the fine aggregate in the aggregate as b, wherein the value range of b is as follows: b is more than or equal to 28 percent and less than or equal to 32 percent;
setting the oilstone ratio in the formula as c, wherein the value range of c is as follows: c is between 4.6 and 5.2 percent;
the dosage ratio of the mineral powder to the asphalt is 0.8-1.0.
Optionally, a is 2.36 mm.
Optionally, the b is 30%.
Optionally, the usage ratio of the mineral powder to the asphalt is 0.9.
Optionally, the asphalt is SBR modified asphalt.
Optionally, c is 5%.
The technical scheme of the application has the following beneficial effects:
the asphalt concrete formula suitable for the high-altitude cold regions consists of aggregates, mineral powder and asphalt, wherein the aggregates are divided into fine aggregates and coarse aggregates, the grain diameter of a boundary line between the fine aggregates and the coarse aggregates is set to be a, if the grain diameter of the aggregates is not more than a, the aggregates are fine aggregates, if the grain diameter of the aggregates is more than a, the aggregates are coarse aggregates, and the value range of a is as follows: a is more than or equal to 2.3mm and less than or equal to 2.4 mm; the mass percentage of the fine aggregate in the aggregate is b, and b is more than or equal to 28% and less than or equal to 32%; the dosage ratio of the mineral powder to the asphalt is 0.8-1.0. According to the method, the mineral aggregate gradation in the asphalt concrete formula is adjusted, so that the passing rate of fine aggregates is reduced, the lower limit of the standard required gradation envelope curve is selected, meanwhile, the ratio of the mineral powder to the asphalt is reduced, and the mineral powder is reduced, so that the purpose of increasing the void ratio of the asphalt concrete pavement after construction is achieved, the temperature shrinkage performance of the asphalt concrete pavement is improved, the cracking rate of the asphalt concrete pavement is reduced, and the purpose of the method is achieved.
Detailed Description
The embodiments will be described in detail below. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
The application provides a bituminous concrete formula suitable for high-altitude cold regions, which comprises aggregate, mineral powder and asphalt, wherein:
the aggregate is divided into fine aggregate and coarse aggregate, the grain size of a boundary line of the fine aggregate and the coarse aggregate is set as a, if the grain size of the aggregate is less than or equal to a, the aggregate is the fine aggregate, if the grain size of the aggregate is more than a, the aggregate is the coarse aggregate, and the value range of a is as follows: a is more than or equal to 2.3mm and less than or equal to 2.4 mm;
setting the mass percentage of the fine aggregate in the aggregate as b, wherein the value range of b is as follows: b is more than or equal to 28 percent and less than or equal to 32 percent;
setting the oilstone ratio in the formula as c, wherein the value range of c is as follows: c is between 4.6 and 5.2 percent;
the dosage ratio of the mineral powder to the asphalt is 0.8-1.0.
In this example, the definition of fine aggregate and coarse aggregate is not different from the standard definition in the industry, but is used as a specific description in this application, essentially to distinguish finer and coarser sized particles in the aggregate. And should not be construed as simply a specialized vocabulary within the industry. In this example, the grain size of the boundary between the fine aggregate and the coarse aggregate has a value range: a is more than or equal to 2.3mm and less than or equal to 2.4mm, thereby obtaining a wider protection range on the premise of meeting the aim of the invention. Within this range, the asphalt concrete produced according to the formulation of this example is capable of producing a relatively large void fraction, as detailed in the following table:
TABLE 1 Curve table of relationship between the ratio of the mineral powder to the asphalt and the void ratio
In actual pavement paving, the applicant performs test section coring on a conventional formula, and finds that the compaction degree of the asphalt concrete with the original proportion (the passing rate of screening the mineral aggregate mixture below 2.36mm is 38%, the using amount ratio of the mineral powder to the asphalt is 1.2, and the oilstone ratio is 5.3%) is higher, the average is 98.6%, the void ratio is 1.4%, the target value of the designed void ratio is not met, the temperature shrinkage of the asphalt concrete pavement is not facilitated, and cracks are easily generated. After the formula in the embodiment is adopted to pave an actual road surface, core taking at a test section is further completed, the void ratio can be kept to be about 5%, and the asphalt concrete is very suitable for high-altitude cold areas.
Optionally, a is 2.36 mm.
In the embodiment, because the standard value for generally distinguishing the fine aggregate from the coarse aggregate in the industry is 2.36mm, the selection of the industry standard value is beneficial to simplification in cost investment on the one hand, and various related devices and processes adopting the standard value for production can be directly applicable, so that the cost investment of re-research and development is avoided; on the other hand, confusion of workers is avoided, and data statistics is facilitated.
Optionally, the b is 30%.
In this example, it is considered that the excellent properties of the present formulation can be better exhibited when the value of b is around 30% by a plurality of experimental comparisons.
Optionally, the usage ratio of the mineral powder to the asphalt is 0.9.
In the embodiment, the use amount ratio of the mineral powder to the asphalt is 0.9, so that the void ratio of the asphalt concrete produced by the formula is further controlled to be 5% and very close to 5%, and the asphalt concrete produced by the formula has good temperature shrinkage performance, meets the paving requirements of high-altitude cold regions, and further reduces the cracking rate of paved pavements.
Optionally, the asphalt is SBR modified asphalt.
In this embodiment, Emulsion-polymerized styrene butadiene rubber (E-SBR), also known as polystyrene butadiene copolymer, is commonly referred to as styrene butadiene rubber. SBR modified asphalt is asphalt added with the modifier. The applicant carries out research comparison of the formulas of the ordinary road petroleum asphalt with the additive A-90 number and the ordinary road petroleum asphalt with the additive A-110 number and the modified asphalt with the additive SBR, and the specific research comparison process and conclusion are as follows:
according to the investigation from the day karst to the Xitong gate S208 province and from the national road 318 day karst to the Lasa airport section, the asphalt concrete construction is respectively carried out by adopting the A-90 ordinary road petroleum asphalt and the A-110 ordinary road petroleum asphalt, and the two ordinary road petroleum asphalts are both prepared by adopting the asphalt concrete produced by the original formula (the passing rate of the mineral aggregate mixture screened below 2.36mm is 38%, the using amount ratio of the mineral powder to the asphalt is 1.2, and the oil-stone ratio is 5.3%). Large-area asphalt concrete pavement cracking occurs within two years after asphalt concrete is paved, longitudinal and transverse cracks and reticular cracks occur in different degrees, wherein the total length from the day-click to the Xitong door S208 province is 83km, large-area damage occurs along the line, a longitudinal crack 12, a transverse crack 1700 and a reticular crack 9 are formed; and the national road 318 Japanese karst reaches the total length of 13km of the pizza machine field section, and the longitudinal cracks 4 and the transverse cracks 300 are left. The specific study parameters are shown in the following table: the petroleum asphalt for the No. A-90 ordinary road is an original formula 1, the petroleum asphalt for the No. A-110 ordinary road is an original formula 2, and data are derived from sampling results of time nodes of two years after pavement is paved.
TABLE 2 statistical tables of void fraction and crack for each formulation
Optionally, c is 5%.
In the embodiment, the asphalt-aggregate ratio of 5% is adopted, the void ratio of the asphalt concrete produced by the formula is further satisfied, and experiments prove that increasing the void ratio to 5% or nearly 5% is very beneficial to optimizing the temperature shrinkage of the asphalt concrete produced by the formula, so that the aim of reducing the cracking rate of the paved road surface is fulfilled.
The asphalt concrete formula suitable for the high-altitude cold regions consists of aggregates, mineral powder and asphalt, wherein the aggregates are divided into fine aggregates and coarse aggregates, the grain diameter of a boundary line between the fine aggregates and the coarse aggregates is set to be a, if the grain diameter of the aggregates is not more than a, the aggregates are fine aggregates, if the grain diameter of the aggregates is more than a, the aggregates are coarse aggregates, and the value range of a is as follows: a is more than or equal to 2.3mm and less than or equal to 2.4 mm; the mass percentage of the fine aggregate in the aggregate is b, and b is more than or equal to 28% and less than or equal to 32%; the dosage ratio of the mineral powder to the asphalt is 0.8-1.0. According to the method, the mineral aggregate gradation in the asphalt concrete formula is adjusted, so that the passing rate of fine aggregates is reduced, the lower limit of the standard required gradation envelope curve is selected, meanwhile, the ratio of the mineral powder to the asphalt is reduced, and the mineral powder is reduced, so that the purpose of increasing the void ratio of the asphalt concrete pavement after construction is achieved, the temperature shrinkage performance of the asphalt concrete pavement is improved, the cracking rate of the asphalt concrete pavement is reduced, and the purpose of the method is achieved.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (5)
1. The asphalt concrete formula suitable for high-altitude cold areas is characterized by comprising aggregates, mineral powder and asphalt, wherein:
the asphalt is SBR modified asphalt;
the aggregate is divided into fine aggregate and coarse aggregate, the grain size of a boundary line of the fine aggregate and the coarse aggregate is set as a, if the grain size of the aggregate is less than or equal to a, the aggregate is the fine aggregate, if the grain size of the aggregate is more than a, the aggregate is the coarse aggregate, and the value range of a is as follows: a is more than or equal to 2.3mm and less than or equal to 2.4 mm;
setting the mass percentage of the fine aggregate in the aggregate as b, wherein the value range of b is as follows: b is more than or equal to 28 percent and less than or equal to 32 percent;
setting the oilstone ratio in the formula as c, wherein the value range of c is as follows: c is between 4.6 and 5.2 percent;
the dosage ratio of the mineral powder to the asphalt is 0.8-1.0.
2. The asphalt concrete formulation suitable for high altitude cold regions according to claim 1, wherein a is 2.36 mm.
3. The asphalt concrete formulation suitable for high altitude cold regions according to claim 1, wherein b is 30%.
4. The asphalt concrete formulation suitable for high altitude cold regions according to claim 1, wherein the ratio of the amount of the ore powder to the amount of the asphalt is 0.9.
5. The asphalt concrete formulation suitable for high altitude cold regions according to claim 1, wherein c is 5%.
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