CN112592106A - Design method for mix proportion of sand grain type iron tailing asphalt mixture - Google Patents
Design method for mix proportion of sand grain type iron tailing asphalt mixture Download PDFInfo
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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
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- C04B26/26—Bituminous materials, e.g. tar, pitch
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- 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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
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- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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Abstract
The invention discloses a design method of a sand grain type iron tailing asphalt mixture mixing proportion. Which comprises the following steps: determining limit sieve pores of the main aggregate and the filling aggregate according to a Bailey method; according to different proportions of coarse and fine aggregates, respectively carrying out rotary compaction on a rotary compactor through a compaction barrel by adopting a rotary compaction step-by-step filling method; selecting three proportions with the largest compaction density as primary grading; selecting the proportion of coarse aggregate and fine aggregate in the three primary grading ranges, carrying out rotary compaction to form each grading test piece, measuring parameters such as main framework clearance rate of each group of test pieces, taking the porosity VV and the mineral aggregate clearance rate VMA as control factors, obtaining the grading with the best volume index as a design grading, carrying out leakage analysis tests and standard flying tests under the design grading, determining the proper asphalt using range, selecting the maximum value, the minimum value and the median using amount from the asphalt using range to prepare rotary compaction test pieces respectively, and determining the optimal asphalt using amount according to the target porosity.
Description
Technical Field
The invention relates to a design method of a sand grain type iron tailing asphalt mixture mixing proportion, and belongs to the technical field of road material engineering.
Background
The iron tailings are the rest of raw iron ore after crushing, screening, grinding, grading, gravity separation, flotation or cyanidation and other separation processes, and useful metals such as iron and the like are separated out, and besides a small amount of metals, the main minerals of the iron tailings are gangue minerals. The exploitation of iron tailing resources generates huge amount of resource garbage-iron tailing sand, and the tailing sand occupies land, pollutes environment and even endangers lives and properties of people. Meanwhile, the investment of traffic infrastructure is increased day by day, the sandstone material is in short supply, the environment protection situation is severe day by day, and the search for reasonable substitute materials is not slow. If the tailing sand can be applied in highway engineering in a large scale, the land can be coiled, the pollution is reduced, the material cost can be reduced, the burden of natural resources is lightened, economic benefits and social benefits can be created, and the sustainable development of the society is promoted.
At present, roads in China are in the rush hour of construction and maintenance, a large number of roads enter the peak hour of maintenance, the number of ultrathin finish projects of the roads, particularly high-grade roads, each year is very large, and a large amount of asphalt sand is also needed for leveling and waterproof layers when bridge deck pavement is carried out. Therefore, the development of research and popularization and application of the iron tailing ultrathin asphalt surface layer has important significance for highway maintenance and new construction thereof. The ultrathin asphalt surface course has the main functions of improving and recovering the skid resistance and the flatness of the old asphalt pavement, and can also be used as the lower layer of the bridge deck pavement to play the roles of leveling, waterproofing and fatigue resistance, and the pavement thickness is generally 2-3 cm. The current major research on ultra-thin asphalt topcoats focuses on the two major categories of AC-5 and SMA-5. The SMA-5 as a compact skeleton structure improves the high-temperature performance compared with an AC-5 suspension compact structure, and has higher water damage resistance, ageing resistance and crack resistance. At present, iron tailing sand is applied to an ultrathin asphalt surface layer by combining the excellent characteristics of the SMA asphalt mixture, so that a novel sand grain type iron tailing asphalt mixture is formed. The iron tailing sand has fine particles, the content of particles with the particle size of more than 1.18mm is extremely low, and the content of particles with the particle size of less than 0.075mm is high. The sand grain type iron tailing asphalt mixture is an asphalt mixture prepared by taking aggregate with the nominal maximum grain diameter of 4.75mm as coarse aggregate and iron tailing sand as fine aggregate without using mineral powder and adding a proper amount of slaked lime and lignin fiber into the coarse aggregate, so that the sand grain type iron tailing asphalt mixture also belongs to discontinuous gradation asphalt mixture and is marked as ITSP-5. The sand grain type iron tailing asphalt mixture has smaller skeleton grain size, and the pavement performance is determined by the structure of the mineral aggregate grading. The asphalt mixture is divided into a dense-suspension structure, a framework-void structure and a framework-dense structure according to the structural composition, and only the suspension-dense structure and the framework-dense structure exist in terms of the sand-type iron tailing asphalt mixture. At present, the grading composition of sand grain type asphalt mixture is less researched in China, and the current specification does not relate to grading sand grain type asphalt mixture grading design coarse and fine aggregate dividing sieve pores and grading range.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a design method of the mixing proportion of a sand grain type iron tailing asphalt mixture, which can simultaneously achieve the optimal mixture framework and the optimal compact state, meet the pavement performance requirement, successfully apply iron tailing sand to the asphalt mixture, save sand stone materials and solve the problem of recycling the existing iron tailings.
The invention is realized by the following technical scheme: a design method of sand grain type iron tailing asphalt mixture mix proportion takes aggregate with nominal maximum grain diameter of 4.75mm as coarse aggregate, iron tailing sand as fine aggregate, and slaked lime and lignin fiber are added into the aggregate to be mixed into asphalt mixture, which is characterized in that: the method comprises the following steps:
(1) determining limit sieve pores of the main aggregate and the filling aggregate according to a Bailey method;
(2) according to different proportions of coarse and fine aggregates, respectively carrying out rotary compaction on a rotary compactor through a compaction barrel by adopting a rotary compaction step-by-step filling method, recording the height after compaction, and determining the compaction density;
(3) selecting three proportions with the largest compacted density as primary selection gradation, measuring the bulk density of the coarse aggregate, measuring the bulk density of the main aggregate in a tamping state, and calculating the void ratio of the main framework;
(4) selecting the proportion of coarse aggregate and fine aggregate in the three primary grading ranges, determining the dosage of lime and asphalt according to the known water stability experience, forming an asphalt mixture test piece by using a rotary compaction method, determining the rotary compaction times according to the traffic load grade, and recording the rotary compaction times as N1；
(5) Rotating, compacting and molding the test pieces in each gradation according to the method in the step 4, and manufacturing 2-4 test pieces in each gradation; measuring the gross volume relative density and the theoretical maximum relative density of the molded test piece, and calculating the void ratio VV, the mineral aggregate clearance ratio VMA and the asphalt saturation VFA;
(6) calculating the target void ratio VV and the number N of times of rotary compaction of each graded mixture1Void ratio VV of1The difference Δ Va;
(7) adjusting the asphalt dosage according to the delta Va, and calculating the asphalt dosage P when the target void ratio is reachedb1，Pb1＝Pb-0.4(ΔVa) Wherein P isbThe amount of bitumen selected for the test;
(8) estimating VMA when the target void ratio VV is estimated according to delta Va and the actually measured VMA1According to the estimated void ratio VV and VMA1，Selecting the grade with the best volume index as the design grade, VMADesign of＝0.1(ΔVa)+VMA；
(9) Determining the optimal asphalt dosage PB1: at design level, according to Pb1，Pb1And +/-0.5 of leakage analysis test and standard flying test, calculating the maximum value and the minimum value of the asphalt dosage, determining a proper asphalt dosage range according to a relation curve between the asphalt dosage and the results of the leakage analysis test and the flying test, selecting the maximum value, the minimum value and the median dosage from the asphalt dosage range to prepare rotary compaction test pieces respectively, measuring volume indexes of each group of test pieces, drawing by taking the asphalt dosage as a horizontal coordinate and each volume index as a vertical coordinate to establish a relation curve between the asphalt dosage and each test data, and determining the optimal asphalt dosage according to a target void ratio.
Further, in step 2, the coarse and fine aggregate is prepared according to the following method: firstly, determining the use amount of coarse aggregate as 100 percent and the use amount of iron tailing sand as 0 percent, then gradually doping the iron tailing sand into the coarse aggregate by taking the step length of the iron tailing sand accounting for 10 percent of the total mass of the mixture, rotating the iron tailing sand on a rotary compactor 100 times after each doping, and determining the compaction density rho as M/V, wherein the M value is fixed to 3000g, and V is the volume calculated according to the compaction height.
Further, in the step 4, when the asphalt mixture test piece is formed by using a rotary compaction method, the asphalt mixture is stirred and then aged for a short time, and the test piece is placed for 2 hours +/-5 minutes at the forming temperature +/-5 ℃.
Further, the nominal particle size of the aggregate as the coarse aggregate is 3 to 5 mm.
The invention has the beneficial effects that: the sand grain type iron tailing asphalt mixture can apply iron tailing sand to the asphalt mixture, so that the iron tailing is comprehensively recycled, and the shortage pressure of natural resources is effectively relieved. According to the sand grain type iron tailing asphalt mixture, the sand grain type asphalt mixture with the skeleton-dense structure is small in void ratio, good in waterproof performance and reasonable in mineral aggregate void ratio, the skeleton and the dense state of the mixture can be optimal at the same time, and the road performance requirements are met; the upper and lower limits of grading fluctuation are determined by screening fluctuation ranges of all grades of materials, so that a reasonable variation range is provided for specific production under the condition of meeting the road performance requirement, and the popularization and the application are facilitated. The invention provides a rotary compaction step-by-step filling method, which can ensure that the main framework reaches the embedding and extruding state and simultaneously reaches the maximum compaction state, and ensures the stability of the mixture framework, thereby ensuring the road performance and the durability of the asphalt mixture. In addition, the cost of the iron tailing sand is lower than that of fine aggregate, the iron tailing mixing amount in the sand type iron tailing asphalt mixture is larger, the cost of raw materials can be effectively reduced, and the economic benefit is obvious.
Drawings
FIG. 1 is a flow chart of the operation of the method of the present invention;
FIG. 2 is a grading diagram in accordance with an embodiment of the invention;
FIG. 3 is a graph of test results of a leak test in an embodiment of the present invention;
FIG. 4 is a graph showing the results of a fly-away test in an embodiment of the present invention;
FIG. 5 is a plot of void fraction versus pitch content for an embodiment of the present invention;
FIG. 6 is a graph of mineral aggregate void fraction versus asphalt content in an embodiment of the present invention;
FIG. 7 is a graph of pitch saturation versus pitch content for an embodiment of the present invention;
Detailed Description
The following will describe in detail a design method of a sand-type iron tailing asphalt mixture mix proportion according to the present invention by way of non-limiting examples and with reference to the accompanying drawings.
FIG. 1 is a flow chart of the operation of the method of the present invention.
The sand grain type iron tailing asphalt mixture is prepared by taking aggregate with the nominal maximum grain diameter of 4.75mm as coarse aggregate, taking iron tailing sand as fine aggregate and adding slaked lime and lignin fiber into the iron tailing sand without using mineral powder, wherein the addition amount of the lignin fiber is 0.3 percent of the total mass of the mixture, and the addition amount of the lime accounts for 2 percent of the total mass of the asphalt mixture. It is preferable in the present invention that the coarse aggregate has a particle size of 3 to 5 mm. Which comprises the following steps:
(1) and determining the limit sieve holes of the main aggregate and the filling aggregate according to a Bailey method.
(2) According to different proportions of coarse and fine aggregates, a rotary compaction step-by-step filling method is adopted, rotary compaction is respectively carried out on a rotary compactor through a compaction barrel, the height after compaction is recorded, and the compaction density is measured.
(3) Selecting three proportions with the largest compaction density as primary selection gradation, measuring the bulk density of the coarse aggregate, measuring the bulk density of the main aggregate in a tamping state, and calculating the void ratio of the main framework. For such mixes, the fine aggregate contains substantially no particles above 1.18mm, so the coarse aggregate is used as the primary aggregate.
(4) The proportion of coarse aggregate and fine aggregate is selected in the three primary grading ranges, the dosage of added lime and asphalt is determined according to known water stability experience, and an asphalt mixture test piece is formed by a rotary compaction method (after the asphalt mixture is mixed, short-term aging is carried out, the test piece is placed for 2h +/-5 min at the forming temperature of +/-5 ℃, and short-term aging is carried out on the performance test of the test piece according to the same method). The number of times of rotary compaction is determined according to the traffic load grade and is recorded as N1。
(5) Rotating, compacting and molding the test pieces in each gradation according to the method in the step 4, and manufacturing 2-4 test pieces in each gradation; measuring the gross volume relative density and the theoretical maximum relative density of the molded test piece, and calculating the void ratio VV, the mineral aggregate clearance ratio VMA and the asphalt saturation VFA;
(6) calculating the target void ratio VV and the rolling times N of each graded mixture1Void ratio VV of1The difference Δ Va;
(7) adjusting the asphalt dosage according to the delta Va, and calculating the asphalt dosage P when the target void ratio is reachedb1，Pb1＝Pb-0.4(Δ Va), wherein PbThe amount of bitumen selected for the test;
(8) estimating VMA when the target void ratio VV is estimated according to delta Va and the actually measured VMA1According to the estimated void ratio VV and VMA1，Selecting the grade with the best volume index as the design grade, VMADesign of＝0.1(ΔVa)+VMA；
(9) Determining the optimal asphalt dosage PB1: at design level, according to Pb1，Pb1And +/-0.5 of leakage analysis test and standard flying test, calculating the maximum value and the minimum value of the asphalt dosage, determining a proper asphalt dosage range according to a relation curve between the asphalt dosage and the results of the leakage analysis test and the flying test, selecting the maximum value, the minimum value and the median dosage from the asphalt dosage range to prepare rotary compaction test pieces respectively, measuring volume indexes of each group of test pieces, drawing by taking the asphalt dosage as a horizontal coordinate and each volume index as a vertical coordinate to establish a relation curve between the asphalt dosage and each test data, and determining the optimal asphalt dosage according to a target void ratio.
The following concrete description takes ITSP-5 sand type iron tailing sand asphalt mixture as an example, and the concrete operation steps are as follows:
(1) according to the beret method, the limiting mesh size of the main aggregate and the filler aggregate is determined to be 1.18 in terms of 0.22 times the nominal maximum particle size. FIG. 2 is an ITSP-5 grading curve of an iron tailings sand asphalt mixture.
(2) And (3) performing rotary compaction on the coarse aggregate and the iron tailing sand according to different proportions to fill step by step, recording the height after compaction, and determining the compaction density. The method comprises the following specific steps: putting coarse aggregates with certain mass and different proportions and iron tailings into a compaction barrel, rotating the compaction barrel on a rotary compactor 100 times each time, and recording the height of the compacted coarse aggregates and the height of the compacted iron tailings. The method comprises the steps of firstly measuring the usage amount of coarse aggregates to be 100%, the usage amount of iron tailings to be 0%, then taking 10% of the iron tailings in the total mass of the mixture as a step length (the usage amount of the coarse aggregates is correspondingly reduced by 10%), gradually doping the iron tailings into the coarse aggregates, rotating the iron tailings on a rotary compactor 100 times after each doping, and measuring the compaction density rho as M/V, wherein the M value is fixed to be 3000g, and V is the volume calculated according to the compaction height.
The measured compacted densities are shown in table 1:
table 1:
(3) determining three proportions with the maximum compaction density as a primary grading, wherein according to the data in the table 1, the three proportions with the maximum compaction density are 70: 30. 60: 40. 50: 50. this primary gradation is controlled as a gradation upper and lower limit. In consideration of improving the water stability, 2 percent by mass of lime is added to the determined gradation to replace iron tailings, and 0.3 percent of lignin fiber is added. The determined gradation is shown in table 2:
table 2:
| name of mineral aggregate | Grading 1 | Grading 2 | Grading 3 |
| Coarse aggregate 3-5mm | 70 | 60 | 50 |
| Iron tailings sand | 28 | 38 | 48 |
| Lime | 2 | 2 | 2 |
(4) And (5) manufacturing a rotary compaction test piece.
And forming the asphalt mixture test piece by using a rotary compaction method, wherein 2-4 test pieces are prepared for each gradation. The gross volume relative density and the theoretical maximum relative density of the molded test piece are measured, and parameters such as the void ratio VV, the mineral aggregate clearance ratio VMA, the asphalt saturation degree VFA and the like are calculated and are shown in Table 3.
The porosity VV and mineral aggregate clearance VMA of the sand grain type iron tailing asphalt mixture are used as target control factors to obtain the sand ratio of coarse aggregate and iron tailing with each index meeting the requirements, wherein the porosity VV of the sand grain type iron tailing asphalt mixture ranges from 2.0% to 4.0%, and the mineral aggregate clearance VMA ranges from 17.0% to 18.0%.
Table 3:
| grading | Grading 1 | Grading 2 | Grading 3 |
| Selected amount of asphalt to be tested | 6.8 | 6.8 | 6.8 |
| Bulk relative density of test piece | 2.516 | 2.512 | 2.510 |
| Void fraction of% | 1.9 | 2.3 | 2.7 |
| Mineral material void fraction% | 16.9 | 17.5 | 18.1 |
| Asphalt saturation VFA | 88.8 | 86.8 | 85.1 |
Setting a target void ratio of 3.0%, and calculating the void ratio VV of 3 gradations when the target void ratio VV and the number of times of rotary compaction are 100 times according to the calculation result1The difference Δ Va; adjusting the asphalt dosage according to the delta Va, and calculating the asphalt dosage P when the target void ratio is reachedb1＝Pb-0.4(Δ Va), calculating VMA at target void fractionIn the design of the device, the device is designed,VMAin the design of the device, the device is designed,＝0.1(ΔVa)+VMAmeasured in fact. The calculation results are shown in table 5.
Table 4:
| grading | Grading 1 | Grading 2 | Grading 3 |
| Selected amount of asphalt to be tested | 6.8 | 6.8 | 6.8 |
| Measured porosity of% | 1.9 | 2.3 | 2.7 |
| Target void fraction | 3.0 | 3.0 | 3.0 |
| Asphalt dosage at target void fraction | 6.36 | 6.52 | 6.68 |
| Measured mineral material void fraction% | 16.9 | 17.5 | 18.1 |
| Mineral aggregate void fraction at target void fraction | 17.0 | 17.6 | 18.1 |
| Asphalt saturation at target void fraction VFA | 82.4 | 83.0 | 83.5 |
Combining the above volume calculation results, the preferred grading 2 is the design grading, Pb1＝6.52％。
(5) And determining the optimal asphalt dosage.
At design level, according to Pb1，Pb1And +/-0.5, performing leakage test and standard flying test, and calculating the maximum value and the minimum value of the asphalt using amount. The results of the leak test and the standard fly-off test are shown in FIGS. 3 and 4.
Determining the asphalt dosage range to be 6.3-6.7 according to a leakage analysis test and a flying test, preparing a group of rotary compaction test pieces by using three different asphalt dosages of 6.3,6.5 and 6.7 respectively, measuring the volume index of each group of test pieces, and establishing a relation curve between the asphalt dosage and each test data according to the measurement result as shown in figures 5-7. The optimum amount of asphalt was determined to be 6.6% with the target void ratio set to 3.0%.
(6) And (3) performing a forming rotary compaction test under the condition of the optimal asphalt dosage, performing a 60 ℃ hamburger rutting test, analyzing the high-temperature stability and the water stability of the hamburger rutting test, controlling the porosity of a test piece to be 7.0 +/-1.0%, and analyzing the pavement performance of the hamburger rutting test. And forming a rut sample according to the Marshall sample standard density, carrying out a water seepage test to test the water seepage coefficient, cutting the rut sample into a trabecular sample, carrying out a low-temperature bending test, and testing the low-temperature crack resistance of the trabecular sample. The test results are shown in table 5.
Table 5:
as can be seen from Table 5, the mix proportion obtained by the design method of the mix proportion can meet the pavement performance requirement.
Other parts in this embodiment are the prior art, and are not described herein again.
Claims (4)
1. A design method of sand grain type iron tailing asphalt mixture mix proportion takes aggregate with nominal maximum grain diameter of 4.75mm as coarse aggregate, iron tailing sand as fine aggregate, and slaked lime and lignin fiber are added into the aggregate to be mixed into asphalt mixture, which is characterized in that: the method comprises the following steps:
(1) determining limit sieve pores of the main aggregate and the filling aggregate according to a Bailey method;
(2) according to different proportions of coarse and fine aggregates, respectively carrying out rotary compaction on a rotary compactor through a compaction barrel by adopting a rotary compaction step-by-step filling method, recording the height after compaction, and determining the compaction density;
(3) selecting three proportions with the largest compacted density as primary selection gradation, measuring the bulk density of the coarse aggregate, measuring the bulk density of the main aggregate in a tamping state, and calculating the void ratio of the main framework;
(4) selecting the proportion of coarse aggregate and fine aggregate in the three primary grading ranges, determining the dosage of lime and asphalt according to the known water stability experience, forming an asphalt mixture test piece by using a rotary compaction method, determining the rotary compaction times according to the traffic load grade, and recording the rotary compaction times as N1；
(5) Rotating, compacting and molding the test pieces in each gradation according to the method in the step 4, and manufacturing 2-4 test pieces in each gradation; measuring the gross volume relative density and the theoretical maximum relative density of the molded test piece, and calculating the void ratio VV, the mineral aggregate clearance ratio VMA and the asphalt saturation VFA;
(6) calculating the target void ratio VV and the number N of times of rotary compaction of each graded mixture1Void ratio VV of1The difference Δ Va;
(7) adjusting the asphalt dosage according to the delta Va, and calculating the asphalt dosage P when the target void ratio is reachedb1，Pb1＝Pb-0.4(Δ Va), wherein PbFor selected asphalts for testingAn amount;
(8) estimating VMA when the target void ratio VV is estimated according to delta Va and the actually measured VMA1According to the estimated void ratio VV and VMA1，Selecting the grade with the best volume index as the design grade, VMADesign of＝0.1(ΔVa)+VMA；
(9) Determining the optimal asphalt dosage PB1: at design level, according to Pb1，Pb1And +/-0.5 of leakage analysis test and standard flying test, calculating the maximum value and the minimum value of the asphalt dosage, determining a proper asphalt dosage range according to a relation curve between the asphalt dosage and the results of the leakage analysis test and the flying test, selecting the maximum value, the minimum value and the median dosage from the asphalt dosage range to prepare rotary compaction test pieces respectively, measuring volume indexes of each group of test pieces, drawing by taking the asphalt dosage as a horizontal coordinate and each volume index as a vertical coordinate to establish a relation curve between the asphalt dosage and each test data, and determining the optimal asphalt dosage according to a target void ratio.
2. The sand-type iron tailing asphalt mixture mix proportion design method according to claim 1, which is characterized in that: in the step 2, the preparation proportion of the coarse and fine aggregates is prepared according to the following method: firstly, determining the use amount of coarse aggregate as 100 percent and the use amount of iron tailing sand as 0 percent, then gradually doping the iron tailing sand into the coarse aggregate by taking the step length of the iron tailing sand accounting for 10 percent of the total mass of the mixture, rotating the iron tailing sand on a rotary compactor 100 times after each doping, and determining the compaction density rho as M/V, wherein the M value is fixed to 3000g, and V is the volume calculated according to the compaction height.
3. The sand-type iron tailing asphalt mixture mix proportion design method according to claim 1, which is characterized in that: in the step 4, when the asphalt mixture test piece is formed by using a rotary compaction method, the asphalt mixture is stirred and then aged for a short time, and the test piece is placed for 2 hours +/-5 minutes at the forming temperature +/-5 ℃.
4. The sand-type iron tailing asphalt mixture mix proportion design method according to claim 1, which is characterized in that: the nominal particle size of the aggregate as coarse aggregate is 3-5 mm.
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Cited By (4)
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| CN113776984A (en) * | 2021-07-05 | 2021-12-10 | 山西省交通科技研发有限公司 | Method for evaluating grain size combination compact state of coarse aggregate |
| CN115017573A (en) * | 2022-05-16 | 2022-09-06 | 东南大学 | SMA (shape memory alloy) grading design method for airport pavement |
| CN115078089A (en) * | 2022-06-09 | 2022-09-20 | 长沙理工大学 | Porous asphalt mixture grading method with improved mechanical properties |
| CN115368045A (en) * | 2022-03-15 | 2022-11-22 | 长安大学 | Large-particle-size LSAM-50 asphalt mixture gradation design method |
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| CN115078089B (en) * | 2022-06-09 | 2023-07-07 | 长沙理工大学 | Porous asphalt mixture grading method with improved mechanical properties |
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