CN115073063A - Small-radius long-longitudinal-slope asphalt pavement material and construction process - Google Patents
Small-radius long-longitudinal-slope asphalt pavement material and construction process Download PDFInfo
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- CN115073063A CN115073063A CN202210727948.1A CN202210727948A CN115073063A CN 115073063 A CN115073063 A CN 115073063A CN 202210727948 A CN202210727948 A CN 202210727948A CN 115073063 A CN115073063 A CN 115073063A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 110
- 239000000463 material Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 55
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 51
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 42
- 239000011707 mineral Substances 0.000 claims abstract description 42
- 239000000203 mixture Substances 0.000 claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 229920005610 lignin Polymers 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000002344 surface layer Substances 0.000 claims abstract description 6
- 239000004575 stone Substances 0.000 claims description 26
- 238000005096 rolling process Methods 0.000 claims description 25
- 238000003892 spreading Methods 0.000 claims description 15
- 230000007480 spreading Effects 0.000 claims description 15
- 235000019738 Limestone Nutrition 0.000 claims description 13
- 239000006028 limestone Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 10
- 238000007580 dry-mixing Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 5
- 201000010099 disease Diseases 0.000 abstract description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 3
- 238000010008 shearing Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000011384 asphalt concrete Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4643—Silicates other than zircon
- C04B14/4656—Al-silicates, e.g. clay
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
- C04B18/26—Wood, e.g. sawdust, wood shavings
-
- 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
- E01C11/00—Details of pavings
- E01C11/16—Reinforcements
- E01C11/165—Reinforcements particularly for bituminous or rubber- or plastic-bound pavings
-
- 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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/22—Binder incorporated in hot state, e.g. heated bitumen
-
- 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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
- E01C7/262—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre with fibrous material, e.g. asbestos; with animal or vegetal admixtures, e.g. leather, cork
-
- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a small-radius long-longitudinal-slope asphalt pavement material and a construction process, wherein the asphalt pavement material comprises the following raw materials in parts by weight: 40-60 parts of SBS modified asphalt, 0-3 parts of basalt fiber, 0-3 parts of lignin fiber, 500-700 parts of coarse aggregate, 180-400 parts of fine aggregate and 10-100 parts of mineral powder; the asphalt mixture prepared by the invention can greatly improve the shearing resistance and fatigue life of the road surface, reduce the whole diseases of the road, prolong the service life of the road and meet the pavement of the surface layer of special road sections such as small-radius long longitudinal slopes and the like.
Description
Technical Field
The invention belongs to the field of road construction, and particularly relates to a small-radius long-longitudinal-slope asphalt pavement material and a construction process.
Background
As one of the main pavement forms of the 21 st century, the appearance of special road sections has placed special demands on various aspects of the performance of asphalt pavements. The small radius long longitudinal slope is a special road section, the transverse distribution and speed of the wheel tracks of the vehicles show respective characteristics on different curve radii and slopes, the defects mainly caused by cracks, transition, crowding and the like exist, and the centrifugal force generated when the vehicles brake and decelerate and turn when entering the curve has higher requirements on the shearing resistance of the road surface.
The doped fiber is one of effective means for improving the performance of the pavement material, and currently, the lignin fiber is doped into the SMA asphalt pavement in most areas of China, and the function of the doped fiber is to prevent asphalt from dripping. However, the better asphalt adsorption capacity of the lignin fiber is that the lignin fiber absorbs asphalt inside the fiber, and the asphalt oil film thickness is not increased, the pavement strength is not improved, and the asphalt consumption is increased, so that the road cost is increased. The basalt fiber is one of four major fibers which are mainly developed in China, has various excellent properties such as high strength, corrosion resistance and high temperature resistance, has good adaptability in asphalt pavements, and becomes one of the mainstream directions of domestic and foreign research. The combination of the two can effectively improve the high temperature, low temperature and fatigue resistance of the asphalt pavement, reduce the consumption of asphalt and reduce the cost.
The basalt fiber asphalt mixture is applied to special road sections such as small-radius long longitudinal slopes and the like, and the excellent road performance of the basalt fiber asphalt mixture can be effectively exerted, so that the improvement of the mixing ratio of the asphalt mixture and the construction process for the special road sections becomes very important.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the asphalt pavement material with the small radius and the long longitudinal slope and the construction process thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 40-60 parts of SBS modified asphalt, 0-3 parts of basalt fiber, 0-3 parts of lignin fiber, 500-700 parts of coarse aggregate, 180-400 parts of fine aggregate and 10-100 parts of mineral powder.
Further, the length of the basalt fiber is 5-16 mm, the diameter of the basalt fiber is 7-16 mu m, the breaking strength is 1800-2500 MPa, and the breaking elongation is 1-3%.
Further, the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone.
Further, the fine aggregate is 0.075-4.75 mm of graded basalt broken stone.
Further, the mineral powder is limestone powder.
The mixing method of the asphalt pavement material with the small radius and the long longitudinal slope specifically comprises the following steps: weighing materials according to the weight part ratio, heating asphalt, coarse aggregates, fine aggregates and mineral powder to 165-180 ℃, dry-mixing the aggregates with basalt fibers or lignin fibers for 60-120 s, adding asphalt to mix for 60-90 s, adding mineral powder to mix for 60-90 s, and obtaining the basalt fiber asphalt mixture.
The invention also provides a construction process of the asphalt pavement material with the small radius and the long longitudinal slope, which comprises the following steps:
(1) preparing a mixture: weighing the SBS modified asphalt, the coarse aggregate, the fine aggregate and the mineral powder in parts by weight; respectively heating the coarse aggregate and the fine aggregate to 165-180 ℃, then dry-mixing the coarse aggregate and the fine aggregate with basalt fibers for 60-120 s, adding asphalt and mixing for 60-90 s, adding mineral powder and mixing for 60-90 s to obtain a basalt fiber asphalt mixture;
(2) spreading the mixture: paving the lower surface layer and the waterproof layer of the pavement after the test is carried out, wherein the paving temperature is not less than 160 ℃, and the paving thickness is 4-8 cm;
(3) and (3) rolling the mixture: immediately rolling at a spreading speed of 20m/min after spreading, starting and stopping at a speed of 5m/min, rolling from the outer side to the central line by a road roller at an initial pressing temperature of not less than 150 ℃, overlapping 1/3-2/3 adjacent rolling belts, rolling for 3-4 times at a final pressing temperature of not less than 90 ℃ until the degree of compaction is more than 98% and no obvious wheel tracks exist.
Compared with the prior art, the invention has the following advantages:
the invention takes SBS modified asphalt, basalt fiber, lignin fiber, coarse aggregate, fine aggregate and mineral powder as raw materials, and prepares the asphalt pavement material with small radius and long longitudinal slope under proper proportioning condition; the pavement material is used for paving a small-radius long longitudinal slope section, can obviously reduce pavement diseases and prolong the service life of roads.
(1) The comprehensive performance is improved, and pavement diseases are reduced: the basalt fibers are mixed to combine the aggregate into a net structure to form a consistent mechanical connection whole, thereby effectively limiting the slippage and the falling off of the aggregate, improving the shear resistance, the rutting resistance and the fatigue resistance of the pavement and inhibiting the accelerated damage of vehicles on the pavement in a small-radius long longitudinal slope.
(2) The service life of the road is prolonged, and the maintenance cost is saved: compared with the common asphalt concrete, the early investment is increased for each ton of basalt fiber asphalt mixture, but the use performance of the asphalt pavement can be greatly improved by doping basalt fibers, the service life of the pavement is prolonged, and the later maintenance cost is greatly saved.
(3) The cost is reduced: the invention finds that the basalt fiber and the lignin fiber are combined for use, so that the effects of effectively improving the performances of high temperature, low temperature, fatigue resistance and the like of the asphalt pavement can be achieved under the conditions of reducing the consumption of asphalt and reducing the cost.
Detailed Description
The technical solution of the present invention is described in detail with reference to specific embodiments, but the scope of the present invention is not limited to the embodiments; the experimental methods described in the examples of the present invention are all conventional methods unless otherwise specified.
The invention relates to a small-radius long-longitudinal-slope asphalt pavement material which comprises the following raw materials in parts by weight: 40-60 parts of SBS modified asphalt, 0-3 parts of basalt fiber, 0-3 parts of lignin fiber, 500-700 parts of coarse aggregate, 180-400 parts of fine aggregate and 10-100 parts of mineral powder;
further, the length of the basalt fiber is 5-16 mm, the diameter of the basalt fiber is 7-16 microns, the breaking strength is 1800-2500 MPa, and the breaking elongation is 1-3%;
further, the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone;
further, the fine aggregate is 0.075-4.75 mm of graded basalt broken stone;
further, the mineral powder is limestone powder;
the construction process of the asphalt pavement material specifically comprises the following steps:
(1) preparing a mixture: weighing materials according to the weight part ratio, heating asphalt, coarse aggregates, fine aggregates and mineral powder to 165-180 ℃, dry-mixing the aggregates and basalt fibers for 60-120 s, adding asphalt and mixing for 60-90 s, adding mineral powder and mixing for 60-90 s to obtain a basalt fiber asphalt mixture;
(2) spreading the mixture: paving the lower surface layer and the waterproof layer of the pavement after the test is carried out, wherein the paving temperature is not less than 160 ℃, and the paving thickness is 4-8 cm;
(3) and (3) rolling the mixture: immediately rolling at a spreading speed of 20m/min after spreading, starting and stopping at a speed of 5m/min, rolling from the outer side to the central line by a road roller at an initial pressing temperature of not less than 150 ℃, overlapping 1/3-2/3 adjacent rolling belts, rolling for 3-4 times at a final pressing temperature of not less than 90 ℃ until the degree of compaction is more than 98% and no obvious wheel tracks exist.
Example 1
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 65 parts of SBS modified asphalt, 3 parts of lignin fiber, 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder.
Paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process specifically comprises the following steps:
(1) preparing a mixture: weighing materials according to the weight part ratio, heating asphalt, coarse aggregates, fine aggregates and mineral powder to 165-180 ℃, dry-mixing the aggregates and lignin fibers for 60-120 s, adding asphalt and mixing for 60-90 s, adding mineral powder and mixing for 60-90 s to obtain a basalt fiber asphalt mixture;
(2) spreading the mixture: paving the lower surface layer and the waterproof layer of the pavement after the test is carried out, wherein the paving temperature is not less than 160 ℃, and the paving thickness is 4-8 cm;
(3) and (3) rolling the mixture: immediately rolling at a spreading speed of 20m/min after spreading, starting and stopping at a speed of 5m/min, rolling from the outer side to the central line by a road roller at an initial pressing temperature of not less than 150 ℃, overlapping 1/3-2/3 adjacent rolling belts, rolling for 3-4 times at a final pressing temperature of not less than 90 ℃ until the degree of compaction is more than 98% and no obvious wheel tracks exist.
Example 2
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 59 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 3mm and the diameter of 7 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process specifically comprises the following steps:
(1) preparing a mixture: weighing materials according to the weight part ratio, heating asphalt, coarse aggregates, fine aggregates and mineral powder to 165-180 ℃, dry-mixing the aggregates with basalt fibers and lignin fibers for 60-120 s, adding asphalt and mixing for 60-90 s, adding mineral powder and mixing for 60-90 s to obtain a basalt fiber asphalt mixture;
(2) spreading the mixture: paving the lower surface layer and the waterproof layer of the pavement after the test is carried out, wherein the paving temperature is not less than 160 ℃, and the paving thickness is 4-8 cm;
(3) and (3) rolling the mixture: immediately rolling at a spreading speed of 20m/min after spreading, starting and stopping at a speed of 5m/min, rolling from the outer side to the central line by a road roller at an initial pressing temperature of not less than 150 ℃, overlapping 1/3-2/3 adjacent rolling belts, rolling for 3-4 times at a final pressing temperature of not less than 90 ℃ until the degree of compaction is more than 98% and no obvious wheel tracks exist.
Example 3
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 58 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 3mm and the diameter of 13 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process was the same as in example 2.
Example 4
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 57 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 3mm and the diameter of 25 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process was the same as in example 2.
Example 5
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 58 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 6mm and the diameter of 7 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process was the same as in example 2.
Example 6
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 57 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 6mm and the diameter of 13 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process was the same as in example 2.
Example 7
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 56 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 6mm and the diameter of 25 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process is the same as in example 2.
Example 8
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 57 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 9mm and the diameter of 7 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process was the same as in example 2.
Example 9
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 56 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 9mm and the diameter of 13 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process was the same as in example 2.
Example 10
A small-radius long-longitudinal-slope asphalt pavement material comprises the following raw materials in parts by weight: 55 parts of SBS modified asphalt, 1 part of lignin fiber, 3 parts of basalt fiber (with the length of 9mm and the diameter of 25 mu m), 600 parts of coarse aggregate, 250 parts of fine aggregate and 90 parts of mineral powder;
wherein the coarse aggregate is 4.75-16.0 mm of graded basalt broken stone; the fine aggregate is 0.075-4.75 mm of graded basalt broken stone; the mineral powder is limestone powder;
paving the pavement by applying the small-radius long-longitudinal-slope asphalt pavement material; the construction process was the same as in example 2.
The results of the relevant test parameters of the small radius long longitudinal slope asphalt pavement materials of the examples 1-10 are shown in the following table 1:
TABLE 1 asphalt pavement Material Performance test parameters
As can be seen from the data in Table 1, the performance test parameters of the asphalt pavement materials in the embodiments 1 to 10 of the invention can meet the specification requirements, and the asphalt pavement materials can be used as asphalt pavement materials with small radius and long longitudinal slope to pave the pavement; also, the performance of the asphalt pavement material in example 5 was the best.
Compared with the embodiment 1, the basalt fibers are added in the embodiments 2 to 10, and the amount of asphalt in the asphalt mixture after the basalt fibers are added is reduced; the dynamic stability, the fatigue life and the shear strength of the obtained asphalt mixture are obviously improved, and the variation of the stability of the soaking residue is small; the method proves that after the basalt fiber is doped, the addition amount of the asphalt can be obviously reduced, and the high-temperature performance, the fatigue resistance and the shear resistance of the obtained asphalt mixture are improved.
The properties of the asphalt pavement materials of comparative examples 2 to 10 show that the shorter the length of the basalt fiber, the finer the diameter of the basalt fiber, and the more asphalt is used; the length and the diameter of the basalt fiber have obvious influence on the performance of the asphalt mixture material; under the same length of the basalt fiber, the performance of the asphalt pavement material obtained by reducing the diameter of the basalt fiber is obviously improved; under the same basalt fiber diameter, the performance of the asphalt pavement material obtained by increasing the length of the basalt fiber is reduced; moreover, the basalt fiber diameter has a relatively obvious influence on the asphalt pavement material, and the basalt fiber length has a relatively insignificant influence on the asphalt pavement material;
the above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any simple changes or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.
Claims (7)
1. The small-radius long-longitudinal-slope asphalt pavement material is characterized by comprising the following raw materials in parts by weight: 40-60 parts of SBS modified asphalt, 0-3 parts of basalt fiber, 0-3 parts of lignin fiber, 500-700 parts of coarse aggregate, 180-400 parts of fine aggregate and 10-100 parts of mineral powder.
2. The asphalt pavement material with a small radius and a long longitudinal slope according to claim 1, characterized in that the basalt fiber has a length of 5 to 16mm, a diameter of 7 to 16 μm, a breaking strength of 1800 to 2500MPa, and an elongation at break of 1 to 3%.
3. The small-radius long-longitudinal-slope asphalt pavement material as claimed in claim 1, wherein the coarse aggregate is 4.75-16.0 mm of graded basalt crushed stone.
4. The small-radius long-longitudinal-slope asphalt pavement material as claimed in claim 1, wherein the fine aggregate is 0.075-4.75 mm of graded basalt crushed stone.
5. The bituminous pavement material with small radius and long longitudinal slope according to claim 1, characterized in that the mineral powder is limestone powder.
6. A mixing method of the asphalt pavement material with the small radius and the long longitudinal slope as claimed in claim 1, which is characterized in that: weighing materials according to the weight part ratio, heating asphalt, coarse aggregates, fine aggregates and mineral powder to 165-180 ℃, dry-mixing the aggregates with basalt fibers or lignin fibers for 60-120 s, adding asphalt to mix for 60-90 s, adding mineral powder to mix for 60-90 s, and obtaining the basalt fiber asphalt mixture.
7. The construction process of the asphalt pavement material with the small radius and the long longitudinal slope as claimed in claim 1, specifically comprising the following steps:
(1) preparing a mixture: weighing materials according to the weight part ratio, heating asphalt, coarse aggregates, fine aggregates and mineral powder to 165-180 ℃, dry-mixing the coarse aggregates and the fine aggregates with basalt fibers and/or lignin fibers for 60-120 s, adding asphalt and mixing for 60-90 s, adding mineral powder and mixing for 60-90 s to obtain a basalt fiber asphalt mixture;
(2) spreading the mixture: paving the lower surface layer and the waterproof layer of the pavement after the test is carried out, wherein the paving temperature is not less than 160 ℃, and the paving thickness is 4-8 cm;
(3) and (3) rolling the mixture: immediately rolling at a spreading speed of 20m/min after spreading, starting and stopping at a speed of 5m/min, rolling from the outer side to the central line by a road roller at an initial pressing temperature of not less than 150 ℃, overlapping 1/3-2/3 adjacent rolling belts, rolling for 3-4 times at a final pressing temperature of not less than 90 ℃ until the degree of compaction is more than 98% and no obvious wheel tracks exist.
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Cited By (1)
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| CN116283064A (en) * | 2022-11-28 | 2023-06-23 | 安徽省路桥工程集团有限责任公司 | Method for preparing asphalt mixture by adding porous basalt fine materials |
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| CN111718155A (en) * | 2020-06-11 | 2020-09-29 | 扬州大学 | Asphalt mixture doped with basalt fibers and lignin fibers |
| CN113045248A (en) * | 2021-03-09 | 2021-06-29 | 中路高科(北京)公路技术有限公司 | Functional composite asphalt mixture for long and large longitudinal slope and preparation method thereof |
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