CN112279558A - Small-particle-size dense-grade ultra-thin wearing layer and preparation method thereof - Google Patents

Small-particle-size dense-grade ultra-thin wearing layer and preparation method thereof Download PDF

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Publication number
CN112279558A
CN112279558A CN202011290772.5A CN202011290772A CN112279558A CN 112279558 A CN112279558 A CN 112279558A CN 202011290772 A CN202011290772 A CN 202011290772A CN 112279558 A CN112279558 A CN 112279558A
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parts
wearing layer
small
thin wearing
aggregate
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Inventor
陈宇亮
吴开
刘至飞
谢海秋
曾辉
彭孝南
李婷玉
张迅
任毅
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Hunan Communications Research Institute Co ltd
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Hunan Communications Research Institute Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02Macromolecular compounds
    • C04B26/26Bituminous materials, e.g. tar, pitch
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075Uses not provided for elsewhere in C04B2111/00 for road construction

Abstract

The invention relates to a small-particle-size dense-grade ultra-thin wearing layer and a preparation method thereof, wherein the ultra-thin wearing layer is prepared from the following components in parts by mass: 100 parts of mineral aggregate, 5.5-7.0 parts of SBS modified asphalt, 0.5-6.0 parts of reinforcing agent and 0.1-0.5 part of lignin fiber for asphalt pavement, wherein the mineral aggregate comprises 70-90 parts of coarse aggregate with the specification of 2.36-4.75 mm, 5-15 parts of fine aggregate with the specification of 0-2.36mm and 5-15 parts of filler, the nominal maximum grain diameter of the small-grain-diameter dense-grade ultra-thin wearing layer which is formed by paving is 4.75mm, and the thickness of the paving layer is 10-20 mm. The small-particle-size dense-grade ultra-thin wearing layer can be used for both the additional paving overlay of the original road surface and the single-lane milling and re-paving of the original road surface, and the paved ultra-thin wearing layer has good water-sealing, anti-sliding and noise-reducing effects. The invention has low cost and simple construction, and is suitable for large-scale popularization and application.

Description

Small-particle-size dense-grade ultra-thin wearing layer and preparation method thereof
Technical Field
The invention relates to the field of road engineering materials, in particular to a small-particle-size dense-grade ultra-thin wearing layer and a preparation method thereof.
Background
After the asphalt pavement is in service for a certain period, some surface functional diseases such as looseness, cracks, rapid attenuation of anti-skid performance and the like are inevitably generated, so that the service performance and the service life of the pavement are influenced. The maintenance aiming at the problems that the asphalt pavement has good structural strength and the surface has functional diseases is one of the hot spots for researching the preventive maintenance technology of the asphalt pavement.
At present, maintenance measures for road surface diseases mainly comprise technologies such as fog sealing, micro-surfacing, hot in-place recycling, milling and re-paving, Novachip ultrathin wearing layers and the like. In these techniques, the fog seal may reduce the skid resistance of the road surface to some extent; the micro-surfacing can improve the anti-skid performance of the pavement, but is influenced by factors such as traffic, climate and the like, and the application of the micro-surfacing in partial areas does not achieve the expected effect; the hot in-place recycling and milling and re-paving can also improve the skid resistance of the road surface to a certain extent, but have the problems of more complex construction process, higher construction cost, quicker decay of the skid resistance and the like. The Novachip ultrathin wearing layer is widely applied to expressways as a typical maintenance technology, but the Novachip ultrathin wearing layer has high requirements on raw materials, cannot be used for milling and re-paving a single lane and has high construction cost.
The ultrathin wearing layer is formed by spreading asphalt mixture with the thickness of 10-25 mm on a newly-built or old asphalt pavement, the surface anti-sliding wearing layer is formed, the overlay structure has excellent performances of skid resistance, noise reduction, water mist reduction, rutting resistance, abrasion resistance and the like, and the overlay structure is widely popularized and applied as a common maintenance measure, but diseases such as pits, scattering and the like are easy to occur in the application of the ultrathin wearing layer technology, and the service life of the ultrathin overlay is seriously influenced.
Therefore, it is necessary to develop a high-performance, extremely thin overlay asphalt mixture for preventive maintenance of asphalt pavement, which can reduce the thickness of the overlay and reduce the construction cost.
Chinese patent CN201710675813.4 authorizes a small-particle-size open-graded asphalt mixture for ultra-thin overlay, the open-graded asphalt mixture has large gap, the mixture is easy to age, the durability is relatively poor, special asphalt needs to be adopted, the manufacturing cost is high, in addition, the open-graded asphalt mixture can only be used for paving the whole section of the original road surface or milling and re-paving the whole section, but not be used for milling and re-paving the single lane.
Chinese patent CN201610121647.9 authorizes an ultrathin asphalt mixture prepared from aggregate, mineral powder, Indonesian Buton rock asphalt, matrix asphalt and polyester fiber, the thickness of the ultrathin asphalt mixture can be 20-25 mm, and the cost needs 60-70 yuan/m2The ultra-thin wearing layer is relatively thick in thickness and relatively high in cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a small-particle-size dense-grade ultra-thin wearing layer and a preparation method thereof, the ultra-thin wearing layer material has good water-sealing, anti-sliding and noise-reducing effects, can be used for paving overlay surface of the original road surface and can also be used for single-lane milling and re-paving of the original road surface, so as to solve the defects in the technical background.
The technical problem solved by the invention is realized by adopting the following technical scheme:
a small-particle-size dense-grade ultra-thin wearing layer comprises the following raw materials in parts by mass:
100 parts of mineral aggregate, 5.5-7.0 parts of SBS modified asphalt, 0.5-6.0 parts of reinforcing agent and 0.1-0.5 part of lignin fiber for asphalt pavement;
the mineral aggregate comprises 70-90 parts of coarse aggregate with the specification of 2.36-4.75 mm, 5-15 parts of fine aggregate with the specification of 0-2.36mm and 5-15 parts of filler, wherein the sum of the parts by mass of the coarse aggregate, the fine aggregate and the filler is 100 parts.
By way of further limitation, the synthetic grading ranges of the coarse aggregate, the fine aggregate and the filler in the mineral aggregate are as follows:
the sieve plate with the thickness of the sieve plate is characterized by comprising a 9.5mm sieve hole passing rate of 100%, a 4.75mm sieve hole passing rate of 90% -100%, a 2.36mm sieve hole passing rate of 18% -36%, a 1.18mm sieve hole passing rate of 16% -26%, a 0.6mm sieve hole passing rate of 14% -24%, a 0.3mm sieve hole passing rate of 12% -20%, a 0.15mm sieve hole passing rate of 10% -18% and a 0.075mm sieve hole passing rate of 8% -16%.
By way of further limitation, the coarse aggregate is basalt or diabase.
By way of further limitation, the fine aggregate is limestone machine-made sand or stone chips, the 2.36mm passing rate is more than 90%, the 0.075mm sieve mesh passing rate is less than 10%, and the sand equivalent is not less than 65%.
As a further limitation, the filler is limestone mineral powder.
The reinforcing agent is one or a mixture of more than two of polyamide resin, urea resin and terpene resin.
A preparation method of a small-particle-size close-graded ultra-thin wearing layer comprises the steps of mixing and discharging an asphalt mixture at 170-190 ℃, paving at no less than 160 ℃, controlling the thickness of a compacted layer to be 10-20 mm, controlling the porosity to be 4-6% and controlling the saturation degree of asphalt to be 65-75%, and thus obtaining the small-particle-size close-graded ultra-thin wearing layer.
The kentucky scattering loss of the small-particle-size dense-grade extremely-thin wearing layer is less than or equal to 10%, the dynamic stability is more than or equal to 5000 times/mm, the freeze-thaw cleavage residual strength ratio is more than or equal to 80%, the pendulum friction coefficient BPN20 is more than or equal to 60, the construction depth is more than or equal to 0.55mm, the water permeability coefficient is less than or equal to 80mL/min, and compared with a common asphalt pavement, the noise reduction effect is 4-10 dB.
The invention has the advantages and beneficial effects that:
1. the small-particle-size dense-grading ultrathin wearing layer materials are all common road materials, have certain economic cost advantage compared with other types of thin-layer cover surfaces, and are suitable for large-scale popularization and application.
2. The stone material with the particle size of 2.36-4.75 mm in the small-particle size asphalt mixture for the ultrathin overlay surface accounts for 70-90 parts, so that the problem of surplus stone material with the particle size of 2.36-4.75 mm in a gravel yard can be solved.
3. The asphalt mixture and the viscous layer oil of the ultrathin wearing layer can be paved by a special all-in-one machine, and can also be asynchronously constructed by a conventional asphalt spreading vehicle and an asphalt mixture paving machine, and the constructed ultrathin wearing layer has excellent road performance such as water resistance, skid resistance, wear resistance, noise reduction and the like.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1:
weighing 100 parts of mineral aggregate (80 parts of coarse aggregate with the particle size of 2.36-4.75 mm, 10 parts of fine aggregate with the particle size of 0-2.36mm and 10 parts of mineral powder), 6.2 parts of SBS modified asphalt, 3.0 parts of terpene resin and 0.3 part of lignin fiber for asphalt pavement.
The used basalt coarse aggregates with the thickness of 2.36-4.75 mm and limestone machine-made sand with the thickness of 0-2.36mm are produced by Anfuxin Lei building materials Co., Ltd; the used mineral powder is produced by a Xianheng Zhengguang stone processing factory in a lotus pond area of the plant continent city; the SBS modified asphalt is produced by Hunan Yibang road material Co., Ltd; the terpene resin is produced by Guangxi Sanfeng group forestry resin factory; the flocculent lignin fiber is produced by Jinshenping building materials Co.
The aggregate used and the filler used were of the synthetic composition given in table 3.
TABLE 3 mineral aggregate compositional grading Range
Mesh size (mm) 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075
Percent passage (%) 100 93.2 24.1 22.2 18.6 15.4 13.2 11.5
The main performance test results of the small-particle size densely-mixed asphalt mixture for the extremely thin wearing layer and the paved and rolled pavement are shown in table 4:
wherein: the method for testing the voidage, the mineral aggregate voidage, the asphalt saturation, the freeze-thaw split residual strength ratio, the loss of the Kentaburg scattering test mixture, the loss of the Schrenburg asphalt leakage test binder and the dynamic stability refers to road engineering asphalt and asphalt mixture test protocol (JTGE 20-2011);
the water permeability coefficient, the pendulum friction coefficient and the construction depth are tested according to the road foundation and pavement site test regulation (JTG 3450 and 2019);
the road noise testing method refers to a road noise testing method (DB 32/T3581-2019) to respectively test the noise of the original road and the road with the extremely thin wearing layer, and the noise reduction effect of the road with the extremely thin wearing layer is calculated according to the difference value of the original road and the road with the extremely thin wearing layer.
TABLE 4 mineral aggregate compositional grading Range
Example 2
Weighing 100 parts of mineral aggregate (75 parts of coarse aggregate with the particle size of 2.36-4.75 mm, 12 parts of fine aggregate with the particle size of 0-2.36mm and 13 parts of mineral powder), 6.4 parts of SBS modified asphalt, 3.5 parts of polyamide resin and 0.4 part of lignin fiber for asphalt pavement. The used basalt coarse aggregates with the diameter of 2.36-4.75 mm are produced in a Changhui green rock gravel field in the county of Chinese chestnut in Pingxi; 0-2.36mm limestone machine-made sand is produced by the carinling division company of enterprise management and consultation Limited liability company of Hunan Hui break; the used mineral powder is produced by a Xianheng Zhengguang stone processing factory in a lotus pond area of the plant continent city; the SBS modified asphalt is produced by Fushan Gaofu petroleum fuel asphalt, Limited liability company; the polyamide resin used was 101L NC010 manufactured by dupont, usa; the flocculent lignin fiber is produced by limited science and technology of Ouluhua fiber in Yancheng.
The aggregate used and the filler used were of the synthetic composition given in table 5.
TABLE 5 mineral aggregate compositional grading Range
Mesh size (mm) 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075
Percent passage (%) 100 95.2 28.5 24.1 20.6 18.2 15.7 13.2
The main performance test results of the small-particle size densely-mixed asphalt mixture for the extremely thin wearing layer and the paved and rolled pavement are shown in table 6:
wherein: the test methods of void ratio, mineral aggregate void ratio, asphalt saturation, freeze-thaw split residual strength ratio, Kentaburg scattering test mixture loss, Schrenburg asphalt leakage test binder loss and dynamic stability refer to road engineering asphalt and asphalt mixture test protocol (JTG E20-2011);
the water permeability coefficient, the pendulum friction coefficient and the construction depth are tested according to the road foundation and pavement site test regulation (JTG 3450 and 2019);
the road noise testing method refers to a road noise testing method (DB 32/T3581-2019) to respectively test the noise of the original road and the road with the extremely thin wearing layer, and the noise reduction effect of the road with the extremely thin wearing layer is calculated according to the difference value of the original road and the road with the extremely thin wearing layer.
TABLE 6 mineral aggregate compositional grading Range
Example 3
Weighing 100 parts of mineral aggregate (85 parts of 2.36-4.75 mm coarse aggregate, 6 parts of 0-2.36mm fine aggregate and 9 parts of mineral powder), 4.0 parts of urea-formaldehyde resin, 6.6 parts of SBS modified asphalt and 0.4 part of lignin fiber for asphalt pavement.
The used 2.36-4.75 mm diabase coarse aggregate is produced by Kaixin mining company Limited, Xinhuan county; 0-2.36mm limestone machine-made sand produced by Hengyang harmony building materials Co.Ltd; the used mineral powder is produced by a Jinshan cement factory; the urea-formaldehyde resin is produced by Shandonghao Shunhua chemical Co., Ltd; the SBS modified asphalt is produced by Hunan Yibang road material Co., Ltd; the flocculent lignin fiber is produced by Jiangsu ideal new globefish material company Limited.
The aggregate used and the filler used were of the synthetic composition given in table 7.
TABLE 7 mineral aggregate synthetic grading Range
Mesh size (mm) 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075
Percent passage (%) 100 90.5 19.2 16.8 14.3 12.8 10.5 10.0
The main performance test results of the small-particle size densely-mixed asphalt mixture for the extremely thin wearing layer and the paved and rolled pavement are shown in table 8:
wherein: the test methods of void ratio, mineral aggregate void ratio, asphalt saturation, freeze-thaw split residual strength ratio, Kentaburg scattering test mixture loss, Schrenburg asphalt leakage test binder loss and dynamic stability refer to road engineering asphalt and asphalt mixture test protocol (JTG E20-2011);
the water permeability coefficient, the pendulum friction coefficient and the construction depth are tested according to the road foundation and pavement site test regulation (JTG 3450 and 2019);
the road noise testing method refers to a road noise testing method (DB 32/T3581-2019) to respectively test the noise of the original road and the road with the extremely thin wearing layer, and the noise reduction effect of the road with the extremely thin wearing layer is calculated according to the difference value of the original road and the road with the extremely thin wearing layer.
TABLE 8 mineral aggregate compositional grading Range
In conclusion, the technical scheme of the invention integrates the characteristics of SMA and OGFC road surface structures, and develops a small-grain-size dense-grade ultra-thin wearing layer (the maximum nominal grain size is 4.75mm) by taking the advantages of the SMA and the OGFC in the aspect of anti-skid performance, so that the anti-skid performance of the original road surface is improved, and the driving safety is guaranteed; meanwhile, aiming at the fact that the wearing layer is thin (10 mm-20 mm), a reinforcing component is introduced, so that the scattering loss of Kentaburg of the prepared small-particle-size dense-grade ultra-thin wearing layer is less than or equal to 10%, the dynamic stability is more than or equal to 5000 times/mm, the freeze-thaw splitting residual strength ratio is more than or equal to 80%, the pendulum friction coefficient BPN20 is more than or equal to 60, the construction depth is more than or equal to 0.55mm, the water permeability coefficient is less than or equal to 80mL/min, compared with a common asphalt pavement, the noise reduction can be carried out by 4-10 dB, and the pavement performance of the.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (4)

1. A small-particle-size dense-graded ultra-thin wearing layer is characterized by comprising the following raw materials in parts by mass:
100 parts of mineral aggregate, 5.5-7.0 parts of SBS modified asphalt, 0.5-6.0 parts of reinforcing agent and 0.1-0.5 part of lignin fiber for asphalt pavement;
the mineral aggregate comprises 70-90 parts of 2.36-4.75 mm-sized coarse aggregate, 5-15 parts of 0-2.36 mm-sized fine aggregate and 5-15 parts of filler, wherein the sum of the parts by mass of the coarse aggregate, the fine aggregate and the filler is 100 parts;
the coarse aggregate is basalt or diabase;
the fine aggregate is limestone machine-made sand or stone chips, the passing rate of a 2.36mm sieve pore is more than 90 percent, the passing rate of a 0.075mm sieve pore is less than 10 percent, and the sand equivalent is not less than 65 percent;
the filler is limestone mineral powder.
2. The small particle size close-graded ultra-thin wearing layer as claimed in claim 1, wherein the coarse aggregate, the fine aggregate and the filler in the mineral aggregate are graded in the range of:
the sieve plate with the thickness of the sieve plate is characterized by comprising a 9.5mm sieve hole passing rate of 100%, a 4.75mm sieve hole passing rate of 90% -100%, a 2.36mm sieve hole passing rate of 18% -36%, a 1.18mm sieve hole passing rate of 16% -26%, a 0.6mm sieve hole passing rate of 14% -24%, a 0.3mm sieve hole passing rate of 12% -20%, a 0.15mm sieve hole passing rate of 10% -18% and a 0.075mm sieve hole passing rate of 8% -16%.
3. The small particle size close-graded extremely thin wearing layer as claimed in claim 1, wherein the reinforcing agent is one or a mixture of two or more of polyamide resin, urea resin and terpene resin.
4. A preparation method of a small-particle-size close-graded ultra-thin wearing layer is characterized in that the small-particle-size close-graded ultra-thin wearing layer is prepared from the raw materials of any one of the components in the claims 1-3, the materials are mixed to produce an asphalt mixture, the discharging temperature is 170-190 ℃, the paving temperature is not lower than 160 ℃, the thickness of the compacted layer is controlled to be 10-20 mm, the void ratio is 4-6%, and the saturation degree of asphalt is 65-75%, so that the small-particle-size close-graded ultra-thin wearing layer is obtained.
CN202011290772.5A 2020-11-17 2020-11-17 Small-particle-size dense-grade ultra-thin wearing layer and preparation method thereof Pending CN112279558A (en)

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