CN111320419A - Ultrathin rubber asphalt wearing layer for pavement - Google Patents
Ultrathin rubber asphalt wearing layer for pavement Download PDFInfo
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- CN111320419A CN111320419A CN202010130866.XA CN202010130866A CN111320419A CN 111320419 A CN111320419 A CN 111320419A CN 202010130866 A CN202010130866 A CN 202010130866A CN 111320419 A CN111320419 A CN 111320419A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
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Abstract
The invention discloses a pavement ultrathin rubber asphalt wearing layer, which comprises the following components: mineral mixture, rubber asphalt; the mineral mixture comprises coarse aggregate, fine aggregate and mineral powder; the coarse aggregate is basalt broken stone with the grain size of 4-7mm and 7-11 mm; the fine aggregate is limestone macadam with the particle size range of 0-4 mm; the mineral powder is limestone mineral powder; the novel rubber and plastic preparation process at 260 ℃ mainly takes physical effects, and the rubber powder is added to show good melt blending characteristics, increase the high-temperature stability of a wearing layer and enhance the aging capacity of pits; meanwhile, a large amount of waste tire rubber powder can be consumed in the construction of the rubber asphalt pavement, the resource utilization of the waste tire is realized, and the black pollution is reduced.
Description
Technical Field
The invention relates to the field of asphalt wearing layer materials, in particular to an ultrathin rubber asphalt wearing layer for a pavement.
Background
The highway maintenance refers to repairing and adjusting the problems of local damage, collapse and the like after combining the specific conditions of regional highway practice, and the highway maintenance is used as a main means for optimizing the highway environment and plays a boosting role in urban development; in combination with the basic situation of the current road maintenance in China, 70-80% of the areas in China need to rely on the road maintenance work to maintain the smoothness of the road and restrain the continuation of diseases, and the road maintenance device plays a significant role in boosting in regional construction; however, as the road construction practice work in China is in the transition stage, a plurality of problems still exist in the road maintenance practice at the moment. For example, the problems of inadequate highway maintenance technology, insufficient maintenance cost, unscientific maintenance management and the like are all the defects existing in the highway maintenance of the national provinces.
At present, the highway is protected by adopting a rubber asphalt wearing layer, but the quality of the rubber asphalt is difficult to ensure in the manufacturing and construction processes, so that the quality is uneven, and the normal traffic running of the highway is influenced due to the disease phenomenon easily generated in the later highway use.
Based on the problems, the invention provides the ultrathin rubber asphalt wearing layer, which is a pavement material capable of improving the anti-skid property of an asphalt pavement surface layer, enhancing the safety performance of a road and improving the driving comfort of the road through reasonable proportioning; the construction of the rubber asphalt pavement can consume a large amount of waste tire rubber powder, realize the resource utilization of the waste tire, reduce black pollution and reduce traffic noise.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an ultrathin rubber asphalt wearing layer, which is paved in a mode of additionally paving the ultrathin asphalt wearing layer when the road surface has the defects of insufficient anti-skid capacity and the like so as to improve the driving comfort, ensure the safety and reduce the driving noise.
The invention provides the following technical scheme:
the ultrathin rubber asphalt wearing layer for the pavement comprises the following components: mineral mixture, rubber asphalt; the mineral mixture comprises coarse aggregate, fine aggregate and mineral powder; the coarse aggregate is basalt broken stone with the grain size of 4-7mm and 7-11 mm; the fine aggregate is limestone macadam with the particle size range of 0-4 mm; the mineral powder is limestone mineral powder.
Preferably, the mass ratio of the mineral mixture to the rubber asphalt is 100: 6.5-8.5.
Preferably, the mass ratio of the mineral mixture to the rubber asphalt is 100: 7.4-7.6.
Preferably, the mass ratio of the 7-11mm coarse aggregate, the 4-7mm coarse aggregate, the 0-4mm fine aggregate and the mineral powder is 53-55: 21-23: 19-21: 3-5.
Preferably, the mass ratio of the 7-11mm coarse aggregate, the 4-7mm coarse aggregate, the 0-4mm fine aggregate and the mineral powder is 54: 22: 20: 4.
preferably, the rubber asphalt comprises base asphalt and rubber powder, and the mass ratio of the rubber powder to the base asphalt is 20-24: 100, respectively; the particle size range of the rubber powder is 30-40 meshes; the penetration degree of the rubber asphalt is 46, the softening point is 63.8 ℃, and the elastic recovery rate is 79.5%.
Preferably, the apparent density of the 7-11mm coarse aggregate is 3.045t/m3The crush value was 13.9%, the abrasion value was 17.2%, and the polish value was 52 BPN.
Preferably, the apparent density of the coarse aggregate of 4-7mm is 3.028t/m3The crush value was 13.9%, the abrasion value was 17.2%, and the polish value was 48 BPN.
Preferably, the fine aggregate sand with the diameter of 0-4mm has the equivalent weight of 63 percent and the apparent density of 2.712 t/m3And the water content is 0.6 percent.
Preferably, the apparent density of the ore powder is 2.731 t/m3Plasticity index of 3.7 and hydropathic index of 0.6.
Preferably, the rubber powder is waste tire rubber powder; the rubber powder of the waste tire is utilized and is supplemented with a small amount of other additives, the process of crushing and pressing is carried out, the novel rubber and plastic preparation process is mainly carried out under the condition of 260 ℃, the rubber powder is added to show good melt blending property, the elastic modulus of the rubber asphalt is further changed to be close to that of the rubber tire, and the reduction of the driving noise is facilitated; meanwhile, a large amount of waste tire rubber powder can be consumed in the construction of the rubber asphalt pavement, the resource utilization of the waste tire is realized, and the black pollution is reduced.
In the construction operation, the wearing layer is spread and is spread the oil-sticking layer and go on simultaneously, does not have the condition that the oil-sticking layer is destroyed and is polluted in the work progress on the one hand, and on the other hand bituminous mixture and oil-sticking layer can closely combine, and the oil-sticking layer can fully permeate into bituminous mixture's lower floor space under high temperature rolling pressure, mends and fills lower floor space, has further promoted its crack resistance and anti loose property.
Preferably, the wearing layer is prepared by mixing a mineral mixture and rubber asphalt, the particle size r1 of the rubber powder and the particle size r2 of the mineral mixture are reasonably proportioned to be more beneficial to embedding and extruding aggregates, the particle diameter ratio surface area S1 of the rubber powder and the specific surface area S2 of the mineral mixture satisfy the following relational expression:
S1=α·（r1r2/r1+r2）1/2；
S2=β·（r1r2/r1+r2）1/2
wherein α is the particle size coefficient with the value range of 0.56-4.72, and α is the particle size coefficient with the value range of 0.327-5.634.
The performance indexes of the coarse aggregate adopted in the invention are as follows:
the fine aggregate performance indexes adopted in the invention are as follows:
the fine aggregate performance indexes adopted in the invention are as follows:
the performance indexes of the rubber asphalt adopted in the invention are as follows:
compared with the prior art, the invention has the following beneficial effects:
(1) according to the ultrathin rubber asphalt wearing layer for the pavement, the waste tire rubber powder is utilized and is supplemented with a small amount of other auxiliary agents, the rubber powder is crushed and pressed, the physical effect is taken as the main part in the process of preparing a novel rubber plastic at the temperature of 260 ℃, the rubber powder is added to show good melting and blending characteristics, the high-temperature stability of the wearing layer is improved, and the pit aging capability is enhanced; meanwhile, a large amount of waste tire rubber powder can be consumed in the construction of the rubber asphalt pavement, the resource utilization of the waste tire is realized, and the black pollution is reduced.
(2) According to the ultrathin rubber asphalt wearing layer for the pavement, in the construction operation, the wearing layer is paved and the viscous oil layer is spread at the same time, so that the condition that the viscous layer is damaged and polluted in the construction process does not exist, the asphalt mixture and the viscous oil layer can be tightly combined, the viscous oil layer can be fully infiltrated into the lower-layer gap of the asphalt mixture under the high-temperature rolling pressure, the lower-layer gap is filled, and the crack resistance and the loosening resistance of the ultrathin rubber asphalt wearing layer are further improved.
(3) According to the ultrathin rubber asphalt wearing layer for the pavement, the wearing layer is prepared by mixing the mineral mixture and the rubber asphalt, and the particle size r1 of the rubber powder and the particle size r2 of the mineral mixture are reasonably proportioned, so that the embedding and extrusion among aggregates are facilitated, the crack resistance and large deformation capacity are further improved, and the stability is further improved.
(4) According to the ultrathin rubber asphalt wearing layer for the road surface, disclosed by the invention, the wearing layer is mixed with rubber asphalt, and the relation among r1, r1, S1 and S2 is limited, so that the wearing layer has a better void ratio, the road surface is communicated with the gaps, the wearing layer and a tire have similar elastic modulus, the driving comfort is further increased, and the noise is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a composite grade of an asphalt wearing course of the present invention.
Figure 2 is a graph of the asphalt wearing course layer composition of the present invention.
FIG. 3 is the results of a 6.5 oilstone-Marshall test for an asphalt wearing course layer of the present invention.
FIG. 4 is the results of a 7.0 oilstone-to-Marshall test for an asphalt wearing course layer of the present invention.
FIG. 5 is the results of a 7.5 oilstone-to-Marshall test for an asphalt wearing course layer of the present invention.
FIG. 6 is the results of a 8.0 oilstone to Marshall test for an asphalt wearing course layer of the present invention.
FIG. 7 is the results of the 8.5 oilstone-to-Marshall test for the asphalt wearing course of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
The ultrathin rubber asphalt wearing layer for the pavement comprises the following components: mineral mixture, rubber asphalt; the mineral mixture comprises coarse aggregate, fine aggregate and mineral powder; the coarse aggregate is basalt broken stone with the grain size of 4-7mm and 7-11 mm; the fine aggregate is limestone macadam with the particle size range of 0-4 mm; the mineral powder is limestone mineral powder.
The mass ratio of the mineral mixture to the rubber asphalt is 100: 6.5-8.5.
The mass ratio of the 7-11mm coarse aggregate, the 4-7mm coarse aggregate, the 0-4mm fine aggregate and the mineral powder is 53-55: 21-23: 19-21: 3-5.
The mass ratio of the 7-11mm coarse aggregate, the 4-7mm coarse aggregate, the 0-4mm fine aggregate and the mineral powder is 54: 22: 20: 4.
the rubber asphalt comprises base asphalt and rubber powder, wherein the mass ratio of the rubber powder to the base asphalt is 20-24: 100, respectively; the particle size range of the rubber powder is 30-40 meshes; the penetration degree of the rubber asphalt is 46, the softening point is 63.8 ℃, and the elastic recovery rate is 79.5%.
The apparent density of the 7-11mm coarse aggregate is 3.045t/m3The crush value was 13.9%, the abrasion value was 17.2%, and the polish value was 52 BPN.
The apparent density of the coarse aggregate of 4-7mm is 3.028t/m3The crush value was 13.9%, the abrasion value was 17.2%, and the polish value was 48 BPN.
The equivalent weight of the 0-4mm fine aggregate sand is 63 percent, and the apparent density is 2.712 t/m3And the water content is 0.6 percent.
The apparent density of the ore powder is 2.731 t/m3Plasticity index of 3.7 and hydropathic index of 0.6.
The rubber powder is waste tire rubber powder; the rubber powder of the waste tire is utilized and is supplemented with a small amount of other additives, the process of crushing and pressing is carried out, the novel rubber and plastic preparation process is mainly carried out under the condition of 260 ℃, the rubber powder is added to show good melt blending property, the elastic modulus of the rubber asphalt is further changed to be close to that of the rubber tire, and the reduction of the driving noise is facilitated; meanwhile, a large amount of waste tire rubber powder can be consumed in the construction of the rubber asphalt pavement, the resource utilization of the waste tire is realized, and the black pollution is reduced.
In the construction operation, the wearing layer is spread and is spread the oil-sticking layer and go on simultaneously, does not have the condition that the oil-sticking layer is destroyed and is polluted in the work progress on the one hand, and on the other hand bituminous mixture and oil-sticking layer can closely combine, and the oil-sticking layer can fully permeate into bituminous mixture's lower floor space under high temperature rolling pressure, mends and fills lower floor space, has further promoted its crack resistance and anti loose property.
Example two
On the basis of the first embodiment, the wearing layer is prepared by mixing a mineral mixture and rubber asphalt, the particle size r1 of rubber powder and the particle size r2 of the mineral mixture are reasonably proportioned to be more beneficial to embedding and extruding aggregates, and the particle diameter ratio surface area S1 of the rubber powder and the specific surface area S2 of the mineral mixture satisfy the following relational expressions:
S1=α·（r1r2/r1+r2）1/2；
S2=β·（r1r2/r1+r2）1/2
wherein α is the particle size coefficient with the value range of 0.56-4.72, and α is the particle size coefficient with the value range of 0.327-5.634.
The performance indexes of the coarse aggregate adopted in the scheme are as follows:
| particle size parameter | 4-7mm | 7-11mm |
| Apparent density | 3.028t/m3 | 3.045t/m3 |
| Appearance (mud content) | 0.7% | 0.4% |
| Content of needle- |
1% | 1% |
| Crush number | 13.9% | 13.9% |
| Polishing value | 488PN | 488PN |
| Abrasion value | 17.2% | 17.2% |
| Water content | 0.5% | 0.5% |
The fine aggregate performance indexes adopted in the scheme are as follows:
| particle size parameter | 0-4mm |
| Sieving | Compliance with grading |
| Sand equivalent | 63% |
| Water content | 0.6% |
| Apparent density | 2.712t/m3 |
| Content of particle diameter less than 0.075mm | 10.6% |
The fine aggregate performance indexes adopted in the scheme are as follows:
| appearance of the product | Without caking |
| Apparent density | 2.731 t/m3 |
| Index of plasticity | 3.7 |
| Coefficient of hydrophilicity | 0.6 |
The performance indexes of the rubber asphalt adopted in the scheme are as follows:
| penetration degree | 46 |
| Softening point | 63.8℃ |
| Degree of extension | 15.3cm |
| Viscosity of the oil | 2.6Pa.s |
| Elastic recovery | 79.55 |
EXAMPLE III
On the basis of the first embodiment and the second embodiment, as shown in fig. 1 and 2, the ultra-thin wearing layer in the technical scheme has a composite gradation and a composite curve thereof.
Example four
On the basis of the first, second and third examples, as shown in FIGS. 3-7, the residual Marshall stability of the rubber asphalt ultrathin wearing layer is tested by the Marshall stability test method of the T0709-2000 asphalt mixture; measuring Marshall flow of the wearing layer at 60 ℃, measuring Marshall stability, respectively calculating Marshall modulus of the test piece according to the values of the Marshall flow and the Marshall stability, and determining the optimal oilstone ratio as follows:
OAC1=(8.0+7.0+7.5+7.5)/4=7.5；
OAC2=(7.0+8.0)/2=7.5；
OAC=(OAC1+OAC2)/2=7.5。
the ultrathin rubber asphalt wearing layer for the pavement is obtained by the design, the waste tire rubber powder is utilized and is supplemented with a small amount of other auxiliary agents, the grinding and pressing are carried out, the physical effect is taken as the main process for preparing the novel rubber and plastic under the condition of 260 ℃, the rubber powder is added to show good melt blending property, the high-temperature stability of the wearing layer is improved, and the pit aging capability is enhanced; meanwhile, a large amount of waste tire rubber powder can be consumed in the construction of the rubber asphalt pavement, so that the resource utilization of the waste tire is realized, and the black pollution is reduced; in the construction operation, the wearing layer is paved and the viscous oil layer is sprayed at the same time, so that the situation that the viscous oil layer is damaged and polluted in the construction process does not exist, the asphalt mixture and the viscous oil layer can be tightly combined, the viscous oil layer can fully permeate into the lower-layer gap of the asphalt mixture under the high-temperature rolling pressure, the lower-layer gap is filled, and the crack resistance and the loosening resistance of the asphalt mixture are further improved; the wearing layer is prepared by mixing a mineral mixture and rubber asphalt, and the particle size r1 of the rubber powder and the particle size r2 of the mineral mixture are reasonably proportioned, so that the embedding and extrusion among aggregates are facilitated, the crack resistance and large deformation capacity are further improved, and the stability is further improved; through the wearing layer that rubber asphalt mixes, make wearing layer have better void fraction, the road surface space intercommunication makes it and tire have similar elastic modulus, further increases the travelling comfort and the noise reduction of driving.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The ultrathin rubber asphalt wearing layer for the pavement is characterized by comprising the following components: mineral mixture, rubber asphalt; the mineral mixture comprises coarse aggregate, fine aggregate and mineral powder; the coarse aggregate is basalt broken stone with the grain size of 4-7mm and 7-11 mm; the fine aggregate is limestone macadam with the particle size range of 0-4 mm; the mineral powder is limestone mineral powder.
2. The ultrathin rubber asphalt wearing layer for the pavement as claimed in claim 1, wherein the mass ratio of the mineral mixture to the rubber asphalt is 100: 6.5-8.5.
3. The ultrathin rubber asphalt wearing layer for the pavement as claimed in claim 1 or 2, wherein the mass ratio of the mineral mixture to the rubber asphalt is 100: 7.4-7.6.
4. The ultrathin rubber asphalt wearing course for road surfaces as claimed in any one of claims 1 to 3, wherein the mass ratio of 7-11mm coarse aggregate, 4-7 coarse aggregate, 0-4 fine aggregate and mineral powder is 53-55: 21-23: 19-21: 3-5.
5. The ultrathin rubber asphalt wearing course for pavement as claimed in claims 1-4, wherein the mass ratio of 7-11mm coarse aggregate, 4-7 coarse aggregate, 0-4 fine aggregate and mineral powder is 54: 22: 20: 4.
6. the ultrathin rubber asphalt wearing layer for the pavement as claimed in claim 1, wherein the rubber asphalt comprises base asphalt and rubber powder, and the mass ratio of the rubber powder to the base asphalt is 20-24: 100, respectively; the particle size range of the rubber powder is 30-40 meshes; the penetration degree of the rubber asphalt is 46, the softening point is 63.8 ℃, and the elastic recovery rate is 79.5%.
7. The ultrathin rubber asphalt wearing course for pavement as claimed in claim 1, wherein the apparent density of 7-11mm coarse aggregate is 3.045t/m3The crush value was 13.9%, the abrasion value was 17.2%, and the polish value was 52 BPN.
8. The ultrathin rubber asphalt wearing course for road surfaces as claimed in claim 1, wherein the apparent density of the coarse aggregate of 4-7mm is 3.028t/m3The crush value was 13.9%, the abrasion value was 17.2%, and the polish value was 48 BPN.
9. The ultrathin rubber asphalt wearing course for road surfaces as claimed in claim 1, wherein said 0-4mm fine aggregate sand equivalent is 63%, and apparent density is 2.712 t/m3And the water content is 0.6 percent.
10. The ultrathin rubber asphalt wearing course for pavement as claimed in claim 1, wherein the apparent density of said ore powder is 2.731 t/m3Plasticity index of 3.7 and hydropathic index of 0.6.
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| CN113321448A (en) * | 2021-06-25 | 2021-08-31 | 福建巨岸建设工程有限公司 | Environment-friendly economical ultrathin pavement high-performance mixture |
| CN113800818A (en) * | 2021-09-03 | 2021-12-17 | 山东高速股份有限公司 | Asphalt anti-skid wearing layer mixture and application thereof |
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| CN113321448A (en) * | 2021-06-25 | 2021-08-31 | 福建巨岸建设工程有限公司 | Environment-friendly economical ultrathin pavement high-performance mixture |
| CN113800818A (en) * | 2021-09-03 | 2021-12-17 | 山东高速股份有限公司 | Asphalt anti-skid wearing layer mixture and application thereof |
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Application publication date: 20200623 |
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