CN108560365B - Method for finely designing Buton rock asphalt mixture - Google Patents
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- CN108560365B CN108560365B CN201810219449.5A CN201810219449A CN108560365B CN 108560365 B CN108560365 B CN 108560365B CN 201810219449 A CN201810219449 A CN 201810219449A CN 108560365 B CN108560365 B CN 108560365B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1054—Preparing mixtures of which at least part of the solid ingredients has previously been deposited on the surface, excluding penetrating or surface dressing, e.g. in situ mixing, mixing involving lifting of spread or windrowed aggregate
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Abstract
The invention relates to a method for finely designing a Buton rock asphalt mixture, which comprises the following steps of (1) determining asphalt content, ash content and ash gradation of Buton rock asphalt; (2) designing to obtain an asphalt mixture without the Buton rock asphalt according to a Marshall design method; (3) determining the blending proportion of asphalt components in the rock asphalt according to a rock asphalt modified asphalt test; (4) according to the test results of (1) - (3), calculating and determining the proportion of ash in the asphalt mixture of the Buton rock in the gradation; (5) adjusting the proportion of the fine aggregate and the mineral powder in the gradation according to the result of the calculation and determination in the step (4); (6) and (5) according to the result of (5), determining the optimal oilstone ratio of the Buton rock asphalt mixture by adopting a Marshall design method according to the interval change of the crude oilstone ratio +/-0.3% of the common asphalt mixture. The invention has the characteristics of easy realization, simplicity, fineness, excellent performance of the mixture and the like, and can better play the role of the Buton rock asphalt in the asphalt mixture.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a method for finely designing a Buton rock asphalt mixture.
Background
The Buton rock asphalt is called an active agent in Indonesia, and has an asphalt content of about 20% to 30% and the balance limestone mineral. The results of indoor research and engineering application show that: the Buton rock asphalt can effectively improve the high-temperature performance, the water damage resistance and the fatigue performance of the asphalt mixture, prolongs the service life of a pavement, and has the advantages of simple construction process, strong operability and better popularization and application prospects.
At present, in the design process of the Buton rock asphalt mixture, most researches are carried out on taking the Buton rock asphalt as a modified additive, and the design method of the Buton rock asphalt mixture mainly comprises the following steps: the first method is that different amounts of Buton rock asphalt are added into a common asphalt mixture, and the optimal amount of the Buton rock asphalt is determined through a Marshall test; secondly, determining the optimal oilstone ratio of the Buton rock asphalt mixture by referring to a certain recommended mixing amount of the Buton rock asphalt; thirdly, directly regarding the Buton rock asphalt as a first-grade fine aggregate to participate in grading design, and determining the optimal oilstone ratio according to a Marshall design method; further, attempts have also been made in recent years to consider replacing the ash material in the buttstone asphalt with fine aggregate or ore powder. However, the characteristics of the Buton rock asphalt material are ignored in the above methods, not only the natural asphalt component in the Buton rock asphalt can have a certain influence on the cementing material in the asphalt mixture, but also the ash content in the Buton rock asphalt is as high as 70% -80%, which has a great influence on the grading and road performance of the asphalt mixture, so that the design method is difficult to exert the maximum effect of the Buton rock asphalt in the asphalt mixture.
Chinese patent CN102276187B discloses a two-stage design method of a Buton rock asphalt modified asphalt mixture, specifically, a BRA is not added in the first stage, and the optimal asphalt-stone ratio of a matrix asphalt mixture is obtained under the condition of a mixing temperature of 155-165 ℃; in the second stage, BRA is added on the basis of obtaining the optimal oilstone ratio of the matrix asphalt mixture in the first stage, and the optimal oilstone ratio of the BRA modified asphalt mixture is obtained under the condition of a mixing temperature of 165-175 ℃. The application provides a method for designing bunton rock bituminous mixture more meticulously, lies in with the difference of above-mentioned patent: firstly, when the optimal asphalt dosage, the optimal asphalt dosage of + 0.2%, + 0.4%, -0.2%, -0.4% (wherein the asphalt dosage is the sum of the asphalt in the matrix asphalt and the rock asphalt) of the matrix asphalt in the first stage are designed in a target mixing ratio in the second stage, the proportion of the matrix asphalt and the natural asphalt component of the Buton rock asphalt in the total asphalt dosage is not specified or explained in detail, and the influence of the natural asphalt component on the matrix asphalt is not considered, so that a method for determining the optimal rock asphalt mixing amount cannot be given; secondly, the meaning of the asphalt dosage is different, the asphalt dosage of the Buton rock asphalt mixture is defined as the sum of the matrix asphalt and the asphalt in the rock asphalt in the patent, and the asphalt dosage in the patent refers to the dosage of the matrix asphalt and does not contain the natural asphalt part in the Buton rock asphalt; thirdly, the ash content in the Buton rock asphalt is not basically mentioned in the patent, and the invention discloses an ash content grading design to replace part of fine aggregate and mineral powder. It is clear that the above patents have the drawback of not giving a method for determining the optimum amount of rock asphalt to be mixed nor taking into account the effect of ash composition, and therefore of not being able to design accurately a bunton rock asphalt mixture. In comparison, the method for designing the Buton rock asphalt mixture in a refined mode can simultaneously take the influences of the natural asphalt components and the ash content grading in the Buton rock asphalt into consideration, accurately calculate and determine the proportion of the ash content in the grading, accurately determine the reasonable mixing amount of the Buton rock asphalt, and can achieve the refinement and the simplification of the Buton rock asphalt mixture design.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a fine design method of the Buton rock asphalt mixture, which can not only consider the influence of natural asphalt components in the Buton rock asphalt, but also consider the influence of ash content grading, thereby realizing the fine and simple design of the Buton rock asphalt mixture.
The purpose of the invention can be realized by the following technical scheme:
a method for finely designing a Buton rock asphalt mixture comprises the following steps:
(1) determining the asphalt content, ash content and ash composition of the Buton rock asphalt;
(2) designing to obtain an asphalt mixture without the Buton rock asphalt according to a Marshall design method;
(3) determining the blending proportion of asphalt components in the rock asphalt according to a rock asphalt modified asphalt test;
(4) according to the test results of (1) - (3), calculating and determining the proportion of ash in the asphalt mixture of the Buton rock in the gradation;
(5) adjusting the proportion of the fine aggregate and the mineral powder in the gradation according to the result of the calculation and determination in the step (4);
(6) and (5) according to the result of (5), determining the optimal oilstone ratio of the Buton rock asphalt mixture by adopting a Marshall design method according to the interval change of the crude oilstone ratio +/-0.3% of the common asphalt mixture.
The pure asphalt and ash content in the Buton rock asphalt in the step (1) are obtained by adopting a trichloroethylene extraction test, and the ash content is determined by referring to a fine aggregate screening test method in Highway engineering aggregate test Specification (JTGE 42-2005).
The design of the common asphalt mixture in the step (2) is carried out by referring to a Marshall design method in technical Specification for construction of road asphalt pavements (JTG F40-2004).
And (3) adding the extracted and recovered asphalt component (RA) into 135 ℃ matrix asphalt according to a corresponding proportion, manually stirring for 5-10min, shearing at a high speed for 20min at about 170 ℃, and finally putting into a 170-180 ℃ oven for development for 30min to prepare the rock asphalt modified asphalt with different mixing amounts.
And (3) the rock asphalt modified asphalt test comprises a penetration test, a softening point test, a ductility test, a dynamic shear rheological test, a bending beam rheological test and a time-scanning test. Wherein, penetration test, softening point test, ductility test, dynamic shear rheological test and bending beam rheological test are respectively carried out according to the operation requirements in road engineering asphalt and asphalt mixture test regulations (JTG E20-2011), the time-scanning test is that a dynamic shear rheometer is used for circularly applying dynamic shear action on a circular modified asphalt sample with the diameter of 8mm and the thickness of 2mm until a test piece is sheared and damaged, parameters such as G, delta and the like of each loading cycle are obtained, the test temperature adopts 20 ℃, the loading frequency adopts 10Hz, the test adopts a sample aged for a short time, and the whole test adopts two loading modes: stress control and strain control.
And (4) determining the proportion of ash in the Buton rock asphalt mixture in the gradation, and calculating by adopting the following formula:
in the formula, mBRThe mass (g) of ash in the mineral aggregate; m isSThe mass (g) of the mineral aggregate; k is the natural asphalt content (%) in the Buton rock asphalt; y is the optimal oilstone ratio (%) of the asphalt mixture without the Buton rock asphalt.
The above ratio calculation formula is derived as follows:
the content of the natural asphalt in the Buton rock asphalt obtained in the step (1) is k, and the optimal oilstone ratio of the asphalt mixture without rock asphalt obtained in the step (2) is y, so that the asphalt mixture without rock asphalt has the optimal oilstone ratio of k
In the formula, k is the content (%) of natural asphalt in the Buton rock asphalt; y is the optimal oilstone ratio (%) of the asphalt mixture without the Buton rock asphalt; m isRARefers to the mass (g) of the bitumen component in the Buton rock bitumen; m isBRARefers to the mass (g) of ash material in the Buton rock bitumen; m isaRefers to the mass (g) of the base asphalt; m isSRefers to the mass (g) of the mineral aggregate.
When the Buton rock asphalt mixture is designed, the natural asphalt component blending proportion determined in the step (3) can be obtained
mRA＝w×ma(formula 3)
In the formula, w represents the blending ratio (based on the matrix asphalt) of the asphalt component in the rock asphalt.
The simultaneous phase division by equations 2 and 3 cancels the unknown number maThe obtainable formula 4 is as follows,
further, the ash mass m in the mixture can be seen from formula 1BRIs composed of
In order to bring ash into the grading design and replace part of fine aggregates and mineral powder, the grading design of the Buton rock asphalt mixture is facilitated, and the proportion of the ash in the grading is determined by calculation as follows:
and can be derived from equation 5
Substituting formula 7 for formula 6 to obtain the proportion calculation formula of ash in the asphalt mixture gradation of the Buton rock as follows:
in the formula, mBRThe mass (g) of ash in the mineral aggregate; m isSThe mass (g) of the mineral aggregate; k is the natural asphalt content (%) in the Buton rock asphalt; y is the optimal oilstone ratio (%) of the asphalt mixture without the Buton rock asphalt.
The synthesis grading of the step (5) meets the grading upper limit and grading lower limit requirements of the design grading type;
and (6) determining the optimal asphalt-stone ratio of the Buton rock asphalt mixture by adopting a Marshall design method in technical Specification for construction of road asphalt pavements (JTG F40-2004).
And (3) after the optimal oilstone ratio is determined, the result is also subjected to performance verification, the performance requirement of the region where the result is required to be met, and for example, a uniaxial injection test, a freeze-thaw split test and a low-temperature split test can be adopted to research the high-temperature performance, the water damage resistance and the low-temperature crack resistance of the Buton rock asphalt mixture.
Compared with the prior art, the method has the following advantages and beneficial effects:
1. the method comprises the steps of firstly, calculating and determining the grading proportion of ash in the Buton rock asphalt mixture according to the influence of natural asphalt components in the Buton rock asphalt on asphalt cement, then, considering the grading characteristic of the ash, taking the grading proportion into the grading design process to determine the mix proportion of various component materials, fully considering the component components of the Buton rock asphalt, simultaneously considering the influence of the natural asphalt components and the ash on the performance of the asphalt mixture, realizing the refinement of the Buton rock asphalt mixture design, and fully playing the role of the Buton rock asphalt in the asphalt mixture.
2. The method provides a proportion calculation formula of ash content in the Buton rock asphalt mixture in grading, is simple and practical, can calculate and determine the mixing amount of the Buton rock asphalt of different grading types aiming at different grading types and different oilstone ratios compared with a certain traditional specific mixing ratio, and realizes the fine design aiming at different grading types and different oilstone ratios.
3. According to the method, on the basis of determining the ash content ratio, the optimum oilstone ratio of the Buton rock asphalt mixture is determined through a Marshall test according to the up-down floating of the optimum oilstone ratio of the common asphalt mixture, and the design process of the Buton rock asphalt mixture is simplified.
4. The method has the characteristics of easiness in realization, simplicity, fineness, excellent performance of the mixture and the like, and can better play the role of the Buton rock asphalt in the asphalt mixture.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
This example takes the design of an AC-13 Buton rock bituminous mixture as an example. The design process mainly comprises the following steps:
(1) the method comprises the steps of sampling the Buton rock asphalt, and then carrying out an extraction test on the sample, wherein the asphalt content of the Buton rock asphalt is 24% through the test. The test results of the screening test on the components of the asphalt ash of the Buton rock obtained in the extraction test are shown in Table 1.
TABLE 1 results of mineral screening after extraction of Buton rock bitumen
| Mesh size/mm | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Through rate/%) | 100 | 96.3 | 92.5 | 83.1 | 75.2 | 60.1 | 50.6 |
(2) Aggregate and mineral powder are subjected to AC-13 common asphalt mixture grading design, and the synthetic grading meets the grading range requirement of road asphalt pavement construction technical specification JTG F40-2004. The asphalt is 70# matrix asphalt, and all performance indexes meet the requirements through determination. The Marshall test method is adopted to determine that the optimum oil-stone ratio of the common asphalt mixture without rock-doped asphalt is 4.9%.
(3) Determining that the blending proportion of the asphalt component in the rock asphalt is 15 percent of that of the matrix asphalt through a rock asphalt modified asphalt test;
(4) according to the test results of the steps (1) - (3) and the formula 8, the proportion of ash in the BRA mixture in the gradation is calculated to be about 2%.
(5) And (5) fine-tuning the ratio of the fine aggregates to the mineral powder according to the ash content ratio determined in the step (4), and finally determining the gradation ratio of the AC-13 Buton rock asphalt mixture as follows: 10-15: 5-10: 3-5: 0-3: mineral powder: ash 49: 17: 5: 26: 1: 2. the AC-13 Buton rock asphalt mixture gradation synthesis results are shown in Table 2.
TABLE 2 AC-13 Buton rock asphalt mixture design grading
(6) The marshall test pieces were molded in five oilstone ratios of 4.0, 4.3, 4.6, 4.9, and 5.2, four for each set. The results of the Marshall test are shown in Table 3.
TABLE 3 results of Marshall test on AC-13 Buton rock asphalt mixture
The optimum oilstone ratio of the Buton rock asphalt mixture is determined to be 4.7% by referring to a calculation method in technical Specification for road asphalt pavement construction (JTG F40-2004) in China, and the results are verified by a Marshall test again, and are shown in Table 4. Thus, it can be seen that: the optimum oilstone ratio of the Buton rock asphalt mixture No. 70 matrix asphalt determined by the Marshall design method was 4.7%.
TABLE 4 AC-13 Mather formation optimum oilstone ratio verification
(7) And (3) performing performance verification on the AC-13 Buton rock asphalt mixture design result, researching the high-temperature performance, the water damage resistance and the low-temperature crack resistance of the Buton rock asphalt mixture by adopting a single-shaft injection test, a freeze-thaw splitting test and a low-temperature splitting test, and comparing the performance with that of a common asphalt mixture. The test results are shown in table 5, and it can be seen that the addition of the Buton rock asphalt can improve the dynamic stability, TSR and low-temperature splitting tensile strength of the asphalt mixture to some extent.
TABLE 5 AC-13 Buton rock asphalt mixture Performance test results
| Index (I) | Buton rock asphalt mixture | Common No. 70 asphalt mixture |
| Dynamic stability/time mm-1 | 4478 | 3056 |
| TSR/％ | 86.6 | 75.3 |
| Low temperature split tensile strength/MPa | 2.461 | 2.411 |
Example 2
This example takes the design of an AC-20 Buton rock asphalt mixture as an example. The design process mainly comprises the following steps:
(1) the method comprises the steps of sampling the Buton rock asphalt, and then carrying out an extraction test on the sample, wherein the asphalt content of the Buton rock asphalt is 25% through the test. The test results of the screening test on the components of the asphalt ash of the Buton rock obtained in the extraction test are shown in Table 6.
TABLE 6 screening results of minerals after extraction of Buton rock bitumen
| Mesh size/mm | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Through rate/%) | 100 | 100 | 100 | 90.5 | 82.9 | 70.2 | 54.0 |
(2) Aggregate and mineral powder are subjected to AC-20 common asphalt mixture grading design, and the synthetic grading meets the grading range requirement of road asphalt pavement construction technical specification JTG F40-2004. The asphalt is 70# matrix asphalt, and all performance indexes meet the requirements through determination. The Marshall test method is adopted to determine that the optimum oil-stone ratio of the common asphalt mixture without rock-doped asphalt is 4.8%.
(3) Determining that the blending proportion of the asphalt component in the rock asphalt is 15 percent of that of the matrix asphalt through a rock asphalt modified asphalt test;
(4) according to the test results of the steps (1) - (3) and the formula 8, the proportion of ash in the BRA mixture in the gradation is calculated to be about 2%.
(5) And (5) fine-tuning the ratio of the fine aggregates to the mineral powder according to the ash content ratio determined in the step (4), and finally determining the gradation ratio of the AC-20 Buton rock asphalt mixture as follows: 15-22: 10-15: 5-10: 0-5: mineral powder: ash content 20: 28: 17: 29: 4: 2. the AC-20 Buton rock asphalt mixture gradation synthesis results are shown in Table 7.
TABLE 7 AC-20 Buton rock asphalt design grading
(6) Marshall test piece forming is carried out according to three oilstone ratios of 4.2%, 4.5% and 4.8%, and four specimens are formed in each group. The results of the Marshall test are shown in Table 8. Finally, the optimal matrix asphalt-oilstone ratio of the AC-20 Buton rock asphalt mixture is determined to be 4.5%.
TABLE 8 results of Marshall test on AC-13 Buton rock asphalt mixture
(7) And (3) performing performance verification on the AC-20 Buton rock asphalt mixture design result, researching the high-temperature performance, the water damage resistance and the low-temperature crack resistance of the Buton rock asphalt mixture by adopting a single-shaft injection test, a freeze-thaw splitting test and a low-temperature splitting test, and comparing the performance with that of a common asphalt mixture. The test results are shown in table 9, and it can be seen that the addition of the Buton rock asphalt can improve the dynamic stability, TSR and low-temperature splitting tensile strength of the asphalt mixture to some extent.
TABLE 9 AC-20 Buton rock asphalt mixture Performance test results
| Index (I) | Buton rock asphalt mixture | Common No. 70 asphalt mixture |
| Shear strength (Mpa) | 1.152 | 0.973 |
| TSR/％ | 91.4 | 84.8 |
| Low temperature split tensile strength/MPa | 4.20 | 3.62 |
Example 3
A method for finely designing a Buton rock asphalt mixture comprises the following steps:
(1) determining asphalt content, ash content and ash composition of the Buton rock asphalt, wherein pure asphalt and ash content are obtained by adopting a trichloroethylene extraction test, and the ash composition is determined by referring to a fine aggregate screening test method in Highway engineering aggregate test Specification (JTGE 42-2005);
(2) designing an asphalt mixture without the Buton rock asphalt by referring to a Marshall design method in technical Specification for construction of road asphalt pavements (JTG F40-2004);
(3) the blending proportion of the asphalt component in the rock asphalt is determined according to a rock asphalt modified asphalt test, specifically, the asphalt component (RA) obtained by extraction and recovery is added into 135 ℃ matrix asphalt according to a corresponding proportion and is manually stirred for 5-10min, then is sheared at a high speed for 20min at the temperature of about 170 ℃, and finally is put into an oven at the temperature of 170-180 ℃ to develop for 30min to prepare rock asphalt modified asphalt with different blending amounts, wherein the rock asphalt modified asphalt test comprises a penetration test, a softening point test, a ductility test, a dynamic shear rheological test, a bending beam rheological test and a time-scanning test. Wherein, penetration test, softening point test, ductility test, dynamic shear rheological test and bending beam rheological test are respectively carried out according to the operation requirements in road engineering asphalt and asphalt mixture test regulations (JTG E20-2011), the time-scanning test is that a dynamic shear rheometer is used for circularly applying dynamic shear action on a circular modified asphalt sample with the diameter of 8mm and the thickness of 2mm until a test piece is sheared and damaged, parameters such as G, delta and the like of each loading cycle are obtained, the test temperature adopts 20 ℃, the loading frequency adopts 10Hz, the test adopts a sample aged for a short time, and the whole test adopts two loading modes: stress control and strain control;
(4) according to the test results of (1) - (3), calculating and determining the proportion of ash in the asphalt mixture of the Buton rock in the gradation, and calculating by adopting the following formula:
in the formula, mBRThe mass (g) of ash in the mineral aggregate; m isSThe mass (g) of the mineral aggregate; k is the natural asphalt content (%) in the Buton rock asphalt; y is the optimal oilstone ratio (%) of the asphalt mixture without the Buton rock asphalt.
The above ratio calculation formula is derived as follows:
the content of the natural asphalt in the Buton rock asphalt obtained in the step (1) is k, and the optimal oilstone ratio of the asphalt mixture without rock asphalt obtained in the step (2) is y, so that the asphalt mixture without rock asphalt has the optimal oilstone ratio of k
In the formula, k is the content (%) of natural asphalt in the Buton rock asphalt; y is the optimal oilstone ratio (%) of the asphalt mixture without the Buton rock asphalt; m isRARefers to the mass (g) of the bitumen component in the Buton rock bitumen; m isBRARefers to the mass (g) of ash material in the Buton rock bitumen; m isaRefers to the mass (g) of the base asphalt; m isSRefers to the mass (g) of the mineral aggregate.
When the Buton rock asphalt mixture is designed, the natural asphalt component blending proportion determined in the step (3) can be obtained
mRA＝w×ma(formula 3)
In the formula, w represents the blending ratio (based on the matrix asphalt) of the asphalt component in the rock asphalt.
The simultaneous phase division by equations 2 and 3 cancels the unknown number maThe obtainable formula 4 is as follows,
further, the ash mass m in the mixture can be seen from formula 1BRIs composed of
In order to bring ash into the grading design and replace part of fine aggregates and mineral powder, the grading design of the Buton rock asphalt mixture is facilitated, and the proportion of the ash in the grading is determined by calculation as follows:
and can be derived from equation 5
Substituting formula 7 for formula 6 to obtain the proportion calculation formula of ash in the asphalt mixture gradation of the Buton rock as follows:
in the formula, mBRThe mass (g) of ash in the mineral aggregate; m isSThe mass (g) of the mineral aggregate; k is the natural asphalt content (%) in the Buton rock asphalt; y is the optimal oilstone ratio (%) of the asphalt mixture without the Buton rock asphalt;
(5) adjusting the proportion of the fine aggregate and the mineral powder in the gradation according to the result of the calculation and determination in the step (4);
(6) and (5) according to the result of (5), determining the optimal oilstone ratio of the Buton rock asphalt mixture by adopting a Marshall design method according to the interval change of the crude oilstone ratio +/-0.3% of the common asphalt mixture.
And (3) after the optimal oilstone ratio is determined, the result is also subjected to performance verification, the performance requirement of the region where the result is required to be met, and for example, a uniaxial injection test, a freeze-thaw split test and a low-temperature split test can be adopted to research the high-temperature performance, the water damage resistance and the low-temperature crack resistance of the Buton rock asphalt mixture.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (6)
1. A method for finely designing a Buton rock asphalt mixture is characterized by comprising the following steps:
(1) determining the asphalt content, ash content and ash composition of the Buton rock asphalt;
(2) designing to obtain an asphalt mixture without the Buton rock asphalt according to a Marshall design method;
(3) determining the blending proportion of asphalt components in the Buton rock asphalt according to a rock asphalt modified asphalt test;
(4) according to the test results of (1) - (3), calculating and determining the proportion of ash in the asphalt mixture of the Buton rock in the gradation;
(5) adjusting the proportion of the fine aggregate and the mineral powder in the gradation according to the result of the calculation and determination in the step (4);
(6) according to the result of (5), determining the optimal oilstone ratio of the Buton rock asphalt mixture by adopting a Marshall design method according to the interval change of the crude oilstone ratio of the common asphalt mixture +/-0.3%;
the rock asphalt modified asphalt test in the step (3) comprises a penetration test, a softening point test, a ductility test, a high-temperature dynamic shear rheological test, a bending beam rheological test and a time-scanning test,
and (4) determining the proportion of ash in the Buton rock asphalt mixture in the gradation, and calculating by adopting the following formula:
in the formula, mBRThe mass (g) of ash in the mineral aggregate; m isSThe mass (g) of the mineral aggregate; k is the natural asphalt content (%) in the Buton rock asphalt; y is the optimal oilstone ratio (%) of the asphalt mixture without the Buton rock asphalt; w represents the blending ratio (%) of the asphalt component in the Buton rock asphalt.
2. The method for refining and designing the Buton rock asphalt mixture as claimed in claim 1, wherein the pure asphalt and ash content of the Buton rock asphalt in the step (1) are obtained by a trichloroethylene extraction test, and the ash content is determined by referring to the fine aggregate screening test method in Highway engineering aggregate test Specification (JTGE 42-2005).
3. The method for refining and designing the Buton rock asphalt mixture as claimed in claim 1, wherein the ordinary asphalt mixture design in step (2) is performed by referring to Marshall design method in technical Specification for construction of road asphalt pavements (JTG F40-2004).
4. The method for refining the Buton rock asphalt mixture according to claim 1, wherein the natural asphalt content k in the Buton rock asphalt is calculated by adopting the following formula:
mRArefers to the mass (g) of the bitumen component in the Buton rock bitumen; m isBRARefers to the mass (g) of ash material in the buton rock bitumen,
marefers to the mass (g) of the base asphalt; m isSRefers to the mass (g) of the mineral aggregate.
5. The method for refining and designing the Buton rock asphalt mixture as claimed in claim 1, wherein the step (6) is carried out by using a Marshall design method in technical Specification for construction of road asphalt pavements (JTG F40-2004) to determine the optimum oilstone ratio of the Buton rock asphalt mixture.
6. The method for refining the Buton rock asphalt mixture according to claim 1, wherein the result is subjected to performance verification after the optimal oilstone ratio is determined.
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| CN201810219449.5A CN108560365B (en) | 2018-03-16 | 2018-03-16 | Method for finely designing Buton rock asphalt mixture |
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| CN106065558A (en) * | 2016-06-07 | 2016-11-02 | 同济大学 | Processing technology is mixed and stirred in a kind of BUTON rock asphalt modified asphalt mixture heating |
| CN107129196A (en) * | 2017-06-20 | 2017-09-05 | 广西桂海高速公路有限公司 | A kind of coarse grain formula stress absorption structure layer asphalt and its design method |
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| US20150291849A1 (en) * | 2014-04-10 | 2015-10-15 | Regents Of The University Of Minnesota | Compositions including asphalt component and graphite component |
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| CN106065558A (en) * | 2016-06-07 | 2016-11-02 | 同济大学 | Processing technology is mixed and stirred in a kind of BUTON rock asphalt modified asphalt mixture heating |
| CN107268388A (en) * | 2017-05-16 | 2017-10-20 | 同济大学 | The preparation method of BUTON rock asphalt modified asphalt mixture |
| CN107129196A (en) * | 2017-06-20 | 2017-09-05 | 广西桂海高速公路有限公司 | A kind of coarse grain formula stress absorption structure layer asphalt and its design method |
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