CN114477857B - Bridge deck stress absorption layer material with high elastic recovery rate and preparation method thereof - Google Patents
Bridge deck stress absorption layer material with high elastic recovery rate and preparation method thereof 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
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- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract
The invention discloses a bridge deck stress absorption layer material with high elastic recovery rate and a preparation method thereof, the bridge deck stress absorption layer material is prepared by taking high-resilience modified asphalt and premixed macadam as raw materials, and the high-resilience modified asphalt is prepared according to the following processes: 1) Independent swelling process of rubber powder in matrix asphalt 2) independent swelling process of SIS in matrix asphalt; 3) Mixing and swelling for the second time. The high-resilience modified asphalt is applied to preparing the bridge deck stress absorbing layer mixture, so that the formation of bridge deck reflection cracks can be prevented. The invention realizes the construction of a high-elasticity modified component network, overcomes the technical problems of limited mixing amount of rubber powder and SIS and insufficient elasticity caused by large viscosity of the composite modified asphalt, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of bridge engineering materials, and particularly relates to a bridge deck stress absorption layer material with high elastic recovery rate and a preparation method thereof.
Background
Along with the soaring of national economy, the scale of road traffic networks in China is continuously enlarged, and the planning and construction of large bridges across rivers and seas and urban expressway overhead bridges are rapidly developed. The bridge deck pavement material has key effects of protecting bridge decks and driving abrasion and the like, and the service effect of the bridge deck pavement material is a key point of attention of bridge builders in the world.
However, with the increasing span of bridges in China in recent years, under the action of dynamic load of bridge deck traveling, the bridge deck pavement layer material is easy to generate larger reflection stress at stress concentration positions between layers or beam slab joints and the like, so that penetrating cracks are formed in the bridge deck pavement layer, water and other aggressive substances are caused to infiltrate downwards to harm the safety of the bridge structure, the abrasion layer is accelerated to be damaged, the bridge deck is more seriously damaged by pits and the like, and the traveling comfort of the bridge is influenced.
In recent years, to solve the cracking problem caused by crack reflection of the bridge deck pavement, engineering design and technicians generally add a layer of elastic stress absorption layer material between the pavement layers to achieve the purposes of absorbing stress and preventing the formation of reflection cracks. At present, the layer material is generally prepared by rubber asphalt, high-viscosity modified asphalt or composite modified asphalt with relatively good elasticity, however, because the whole flexibility of the large-span bridge is larger, and with the increasing of the bridge driving load and the traffic volume in recent years, the level of the reflection stress formed at the stress concentration position of the bridge deck is continuously improved, and the current bridge deck stress absorbing layer material has limited viscoelastic property of the used asphalt, so that the stress absorbing effect still has larger lifting space.
Disclosure of Invention
The invention aims to provide a bridge deck stress absorbing layer material with high elastic recovery rate and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: a bridge deck stress absorption layer material with high elastic recovery rate comprises raw materials of high-resilience modified asphalt and premixed macadam, wherein the high-resilience modified asphalt is prepared by independently swelling rubber powder and SIS in matrix asphalt respectively and then mixing for secondary swelling; wherein the mass ratio of the high-resilience modified asphalt to the pre-mixed crushed stone is 100 (620-1080).
Further, the preparation of the high-resilience modified asphalt comprises the following steps:
1) Independent swelling process of rubber powder in matrix asphalt
Heating the substrate asphalt to 160-170 ℃, preserving heat for 10-20 min, placing the substrate asphalt in a high-speed shearing machine, then sequentially adding the surface activated rubber powder, the tackifying component and the compatibilization component, and shearing the substrate asphalt at a high speed for 10-20 min; wherein the mass ratio of the matrix asphalt: surface-activated rubber powder: a tackifying component: the compatibilization component =100 (30-45): (4-6): 5-8); in the shearing process, the rotating speed is controlled to be 3000-6000 rad/min, and the temperature is controlled to be 180-190 ℃; standing the sheared mixture at 130-150 ℃ for 30-40 min to obtain the rubber powder independent swelling asphalt;
2) Independent swelling process of SIS in base asphalt
Heating the matrix asphalt to 160-170 ℃, preserving heat for 10-20 min, placing in a high-speed shearing machine, then sequentially adding SIS and dispersing components, and shearing at high speed for 20-30 min; wherein the mass ratio of the matrix asphalt: SIS: the dispersion components are (10-16) and (3-7) respectively; the rotating speed is controlled to be 5000-8000 rad/min and the temperature is controlled to be 180-190 ℃ in the shearing process; standing the sheared mixture at 140-160 ℃ for 30-40 min to obtain SIS independent swelling asphalt;
3) Hybrid two-shot swelling process
Heating the rubber powder independent swelling asphalt and the SIS independent swelling asphalt to 180-190 ℃ respectively, mixing, placing the mixture into a high-speed shearing machine, adding a crosslinking component, and shearing at a high speed for 20-30 min; wherein the mass ratio of the rubber powder to the independently swollen asphalt: SIS independent swelling asphalt: the cross-linking component =100, (100-140), (2-4); in the shearing process, the rotating speed is controlled to be 2000-4000 rad/min, and the temperature is controlled to be 180-190 ℃; and stirring the sheared mixture for 30-60 min at 140-160 ℃ to obtain the high-resilience modified asphalt.
Further, the base asphalt in the step 1) and the step 2) is re-cross-linked 70# asphalt or re-cross-linked 90# asphalt, and the base asphalt used in the step 1) and the step 2) is the same in type; in the step 1), the tackifying component is one or more of terpene resin, C9 petroleum resin or C5 petroleum resin which are mixed according to any proportion; the compatibilization component is one or a mixture of methyl methacrylate, octadecyl acrylate, tert-butyl acrylate or dimethylaminoethyl methacrylate according to any proportion.
Further, the preparation method of the surface activated rubber powder in the step 1) comprises the following steps: preheating rubber powder at 50-55 ℃ for 80-120 s, adding the surface activation component A, stirring for 10-30 min, raising the temperature to 70-75 ℃, adding the surface activation component B, and stirring for 5-10 min; wherein the mass ratio of the rubber powder: surface-activating component a: the surface activation component B =100, (5-20) and (2-6); and finally, reducing the temperature to room temperature, and continuously stirring for 30-60 min at the room temperature to obtain the surface activated rubber powder.
Further, the rubber powder is 80-mesh or 120-mesh bias tire vulcanized rubber powder; the surface activation component A is one or more of aromatic base rubber oil, aliphatic hydrocarbon solvent oil, furfural extract oil or low-sulfur light distillate oil which are mixed according to any proportion; the surface activating component B is a mixture of sodium dodecyl sulfate and acrylamide with the mass ratio of 100 (120-200).
Further, the SIS of step 2) is a styrene-polyisoprene-styrene block copolymer; the dispersion component is one of polyacrylamide and triethanolamine.
Further, the crosslinking component in the step 3) is a mixture of sulfur and di-o-tolylguanidine in a mass ratio of 100 (20-40).
Further, the preparation of the ready-mixed macadam comprises the following steps: heating the crushed stone aggregate to 190-210 ℃, placing the crushed stone aggregate in a stirrer, and crushing the crushed stone aggregate according to the mass ratio: and (3) adding the modified asphalt into the mixture, and stirring the mixture for 30 to 50 seconds to obtain the premixed macadam, wherein the modified asphalt is (0.4-0.8).
Further, the crushed stone aggregate is one of basalt or diabase, and the nominal grain size is 9.5-13.2 mm or 4.75-9.5 mm; the modified asphalt is SBS modified asphalt.
The invention also provides a preparation method of the bridge deck stress absorption layer material with high elastic recovery rate, which comprises the following steps:
cleaning a paving base surface before construction; heating the prepared high-resilience modified asphalt to 165-175 ℃, and spraying the high-resilience modified asphalt to a paved base surface, wherein the spraying amount is controlled to be 1.8-2.2 kg/m 2 (ii) a After the asphalt is spread, spreading the pre-mixed macadam on the asphalt by using spreading equipment, wherein the spreading amount is 14-19 kg/m 2 (ii) a After spreading, rolling the surface of the premixed macadam by adopting compaction equipment; and finally, cleaning the premixed macadam which is not bonded on the surface to obtain the bridge deck stress absorption layer material with high elastic recovery rate.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, two main modified components of SIS and rubber powder are separately sheared and swelled by different processes through a secondary independent swelling technology, so that the SIS and the rubber powder can be more stably fused with a light component in the matrix asphalt; on the basis, the surface of the rubber powder is subjected to surface grafting modification before the independent swelling stage of the rubber powder, so that the surface of the rubber powder is rich in C = C bonds and carboxyl active groups; by adding the dispersing component in the SIS swelling process, the molecular chain of the SIS with a macromolecular structure in the matrix asphalt is fully stretched to form a network; and finally, C = C double bonds of the SIS and the rubber particle surface are opened through the crosslinking effect of the S element in the mixing swelling process, and the rubber particle-SIS integral modified network structure is formed through crosslinking.
The invention avoids the problem that the mixing amount and swelling degree of SIS and rubber powder are limited due to overlarge viscosity in the modification process of the traditional composite modified asphalt, obtains the high-resilience modified asphalt with a complete modifier molecular network inside, obviously improves the elastic recovery rate and stiffness compared with the traditional various modified asphalt, and has more excellent stress absorption effect in a bridge deck stress absorption layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a bridge deck stress absorption layer material with high elastic recovery rate, which is prepared from raw materials of high-resilience modified asphalt and premixed macadam; the high-resilience modified asphalt is prepared by independently swelling rubber powder and SIS in matrix asphalt respectively and then mixing for secondary swelling. The preparation methods of the high-resilience modified asphalt, the pre-mixed crushed stone and the bridge deck stress absorbing layer material are shown in the following examples; in the following examples, unless otherwise specified, all reagents used were commercially available chemical reagents or industrial products.
Example 1
1) Independent swelling of rubber crumb in base asphalt
Stirring the rubber powder in a stirring pot at 50 ℃ for 80 seconds to fully preheat the rubber powder, then adding a surface activation component A, stirring for 30min, increasing the temperature to 70 ℃, adding a surface activation component B (mass ratio, rubber powder: surface activation component A: surface activation component B = 100.
Heating the matrix asphalt to 165 ℃, preserving heat for 15min, placing the matrix asphalt in a high-speed shearing machine, then sequentially adding a surface activated rubber powder, a tackifying component and a compatibilization component (mass ratio, matrix asphalt: surface activated rubber powder: tackifying component: compatibilization component =100: 6), high-speed shearing for 10min, wherein in the shearing process, the rotating speed is 4500rad/min, and the temperature is 185 ℃; and standing the sheared mixture at 130 ℃ for 30min to obtain the rubber powder independent swelling asphalt.
The rubber powder is 80-mesh bias tire vulcanized rubber powder; the surface activating component A is aromatic base rubber oil; the surface activating component B is a mixture of sodium dodecyl sulfate and acrylamide, and the mass ratio is as follows: sodium lauryl sulfate: acrylamide = 100; the matrix asphalt is heavy-traffic 90# asphalt; the tackifying component is a terpene resin; the compatibilization component is methyl methacrylate.
2) Independent swelling of SIS in matrix asphalt
Heating matrix asphalt to 165 ℃, preserving heat for 10min, placing in a high-speed shearing machine, then sequentially adding SIS and dispersion components (mass ratio, matrix asphalt: SIS: dispersion component = 100); and standing the sheared mixture at 150 ℃ for 30min to obtain the SIS independent swelling asphalt.
The matrix asphalt is heavy cross-linked 90# asphalt, and the SIS is a styrene-polyisoprene-styrene block copolymer; the dispersing component is polyacrylamide.
3) Mixed secondary swelling
Heating the rubber powder independent swelling asphalt and the SIS independent swelling asphalt to 180 ℃ respectively, mixing, placing in a high-speed shearing machine, adding a crosslinking component (mass ratio, rubber powder independent swelling asphalt: SIS independent swelling asphalt: crosslinking component = 120), and shearing at a high speed for 20min, wherein in the shearing process, the rotating speed is controlled to be 2500rad/min, and the temperature is controlled to be 190 ℃; and stirring the sheared mixture at a low speed for 45min at 160 ℃ to obtain the high-resilience modified asphalt.
The crosslinking component is a mixture of sulfur and di-o-tolylguanidine, and the mass ratio is as follows: sulfur: di-o-tolylguanidine = 100.
4) Preparation of premixed macadam
Heating the crushed stone aggregate to 200 ℃, placing the crushed stone aggregate in a stirrer, and mixing the crushed stone aggregate according to the mass ratio: modified asphalt =100, and the kneaded material was stirred for 30 seconds after adding the modified asphalt to obtain a ready-mixed crushed stone.
The crushed stone aggregate is basalt, and the nominal grain size is 9.5-13.2 mm; the modified asphalt is SBS modified asphalt.
5) Preparation of bridge deck stress absorption layer material with high elastic recovery rate
Taking cement concrete as a pavement base, cleaning the pavement base before construction to ensure that no obvious dust, stone chips and sundries exist, heating the prepared high-resilience modified asphalt to 175 ℃, spraying the high-resilience modified asphalt to the pavement base, and controlling the spraying amount to be 1.9kg/m 2 After the asphalt is spread, spreading the pre-mixed macadam on the asphalt by using spreading equipment with the spreading amount of 14kg/m 2 Finish spreadingAnd then, rolling the surface of the premixed macadam by adopting compaction equipment, and finally cleaning the premixed macadam which is not bonded on the surface to obtain the bridge deck stress absorption layer material with high elastic recovery rate.
The performance indexes of the high-resilience modified asphalt prepared in the embodiment are shown in table 1:
TABLE 1 example 1 Performance index of high resilience modified asphalt
| Test items | Unit of | Technical index |
| Softening point | ℃ | 95.0 |
| Ductility at 5 DEG C | cm | 40.6 |
| Elastic recovery at 25 DEG C | ％ | 99.5 |
| 5 ℃ elastic recovery | ％ | 91.5 |
| Time required for elastic recovery to 95% at 25 DEG C | s | 19 |
The performance criteria for the bridge deck stress absorbing layer material with high elastic recovery rate prepared in this example are shown in table 2:
TABLE 2 bridge deck stress absorbing layer material Performance index for high elastic recovery Rate made in example 1
| Simulating dynamic load | Incipient fracture | 1cm | 2cm | 3cm | Terminal fissure |
| 0.6 stress ratio/10 Hz | 38800 | 39500 | 43850 | 46920 | 52900 |
Example 2
1) Independent swelling of rubber crumb in base asphalt
Stirring the rubber powder in a stirring pot at 50 ℃ for 80s to fully preheat the rubber powder, then adding a surface activation component A, stirring for 10min, raising the temperature to 70 ℃, adding a surface activation component B (mass ratio, rubber powder: surface activation component A: surface activation component B =100: 3), stirring for 5min, finally, closing the stirring pot, reducing the temperature of the stirring pot to room temperature, and continuously stirring at room temperature for 30min to obtain the surface activation rubber powder.
Heating matrix asphalt to 160 ℃, preserving heat for 10min, placing the matrix asphalt in a high-speed shearing machine, then sequentially adding a surface activated rubber powder, a tackifying component and a compatibilization component (mass ratio, matrix asphalt: surface activated rubber powder: tackifying component: compatibilization component = 5), high-speed shearing for 15min, wherein in the shearing process, the rotating speed is controlled to be 3000rad/min, and the temperature is controlled to be 180 ℃; and standing the sheared mixture at 150 ℃ for 35min to obtain the rubber powder independent swelling asphalt.
The rubber powder is 80-mesh bias tire vulcanized rubber powder; the surface activating component A is low-sulfur light distillate oil; the surface activation component B is a mixture of sodium dodecyl sulfate and acrylamide, and the mass ratio is as follows: sodium lauryl sulfate: acrylamide = 100; the matrix asphalt is heavy cross-linked 70# asphalt; the tackifying component is a C9 petroleum resin; the compatibilization component is a mixture of tert-butyl acrylate and dimethylaminoethyl methacrylate according to a mass ratio of 1.
2) Independent swelling of SIS in base asphalt
Heating matrix asphalt to 160 ℃, preserving heat for 10min, placing in a high-speed shearing machine, then sequentially adding SIS and dispersing components (mass ratio, matrix asphalt: SIS: dispersing component =100 3), high-speed shearing for 30min, and controlling the rotation speed to 5000rad/min and the temperature to 180 ℃ in the shearing process; and standing the sheared mixture at 160 ℃ for 35min to obtain the SIS independent swelling asphalt.
The matrix asphalt is heavy-traffic 70# asphalt; the SIS is a styrene-polyisoprene-styrene block copolymer; the dispersing component is triethanolamine.
3) Mixed secondary swelling
Heating the rubber powder independent swelling asphalt and the SIS independent swelling asphalt to 180 ℃ respectively, mixing, placing in a high-speed shearing machine, adding a crosslinking component (mass ratio, rubber powder independent swelling asphalt: SIS independent swelling asphalt: crosslinking component =100: 2), and shearing at a high speed for 20min, wherein in the shearing process, the rotating speed is controlled to be 2000rad/min, and the temperature is controlled to be 180 ℃; and stirring the sheared mixture at 140 ℃ for 30min at a low speed to obtain the high-resilience modified asphalt.
The crosslinking component is a mixture of sulfur and di-o-tolylguanidine, and the mass ratio is as follows: sulfur: di-o-tolylguanidine = 100.
4) Preparation of premixed macadam
Heating the crushed stone aggregate to 190 ℃, placing the crushed stone aggregate in a stirrer, and crushing the crushed stone aggregate according to the mass ratio: modified asphalt =100, and the kneaded material was stirred for 30 seconds after adding the modified asphalt to obtain a ready-mixed crushed stone.
The crushed stone aggregate is basalt, and the nominal grain size is 4.75-9.5 mm; the modified asphalt is SBS modified asphalt.
5) Preparation of bridge deck stress absorption layer material with high elastic recovery rate
Taking cement concrete as a pavement base, cleaning the pavement base before construction to ensure that no obvious dust, stone chips and sundries exist, heating the prepared high-resilience modified asphalt to 175 ℃, spraying the high-resilience modified asphalt to the pavement base, and controlling the spraying amount to be 2.0kg/m 2 Immediately spreading the pre-mixed macadam on the asphalt by spreading equipment after the asphalt is spread, wherein the spreading amount is 16kg/m 2 After the spreading is finished, rolling the surface of the premixed macadam by adopting compaction equipment, and finally cleaning the premixed macadam which is not bonded on the surface to obtain the bridge deck stress absorption layer material with high elastic recovery rate.
The performance indexes of the high-resilience modified asphalt prepared by the embodiment are shown in Table 3:
TABLE 3 Performance index of high resilience modified asphalt prepared in example 2
| Test items | Unit of | Technical index |
| Softening point | ℃ | 92.7 |
| Ductility at 5 DEG C | cm | 41.2 |
| Elastic recovery at 25 DEG C | ％ | 99.6 |
| 5 ℃ elastic recovery | ％ | 88.5 |
| Time required for elastic recovery to 95% at 25 DEG C | s | 24 |
The performance criteria for the bridge deck stress absorbing layer material with high elastic recovery rate prepared in this example are shown in table 4:
TABLE 4 bridge deck stress absorbing layer material Performance index for high elastic recovery Rate made in example 2
| Simulating dynamic load | Initial crack | 1cm | 2cm | 3cm | Terminal fissure |
| 0.6 stress ratio/10 Hz | 31800 | 33500 | 34650 | 36920 | 43600 |
Example 3
1) Independent swelling of rubber crumb in base asphalt
Stirring the rubber powder in a stirring pot at 50 ℃ for 120s to fully preheat the rubber powder, then adding a surface activation component A, stirring for 10min, raising the temperature to 70 ℃, adding a surface activation component B (mass ratio, rubber powder: surface activation component A: surface activation component B =100: 6), stirring for 10min, finally, closing the stirring pot, reducing the temperature of the stirring pot to room temperature, and continuously stirring at room temperature for 60min to obtain the surface activation rubber powder.
Heating matrix asphalt to 170 ℃, keeping the temperature for 20min, placing the matrix asphalt in a high-speed shearing machine, then sequentially adding a surface activated rubber powder, a tackifying component and a compatibilization component (mass ratio, matrix asphalt: surface activated rubber powder: tackifying component: compatibilization component = 45: 7), and performing high-speed shearing for 20min, wherein in the shearing process, the rotating speed is controlled to be 6000rad/min, and the temperature is controlled to be 190 ℃; and standing the sheared mixture at 150 ℃ for 40min to obtain the rubber powder independent swelling asphalt.
The rubber powder is vulcanized rubber powder of 120-mesh bias tire; the surface activation component A is aliphatic hydrocarbon solvent oil and furfural extract oil according to the mass ratio of 1:1, mixing; the surface activation component B is a mixture of sodium dodecyl sulfate and acrylamide, and the mass ratio is as follows: sodium lauryl sulfate: acrylamide = 100; the matrix asphalt is heavy-traffic 90# asphalt; the tackifying component is a C9 petroleum resin; the compatibilization component is octadecyl acrylate.
2) Independent swelling of SIS in base asphalt
Heating matrix asphalt to 170 ℃, preserving heat for 20min, placing in a high-speed shearing machine, then sequentially adding SIS and dispersing components (mass ratio, matrix asphalt: SIS: dispersing component = 16; and standing the sheared mixture at 150 ℃ for 40min to obtain the SIS independent swelling asphalt.
The matrix asphalt is heavy-traffic 90# asphalt; the SIS is a styrene-polyisoprene-styrene block copolymer; the dispersing component is triethanolamine.
3) Mixed secondary swelling
Heating the rubber powder independent swelling asphalt and the SIS independent swelling asphalt to 190 ℃ respectively, mixing, placing in a high-speed shearing machine, adding a crosslinking component (mass ratio, rubber powder independent swelling asphalt: SIS independent swelling asphalt: crosslinking component =100: 4), shearing at high speed for 30min, controlling the rotating speed to be 4000rad/min, and controlling the temperature to be 190 ℃; and stirring the sheared mixture at 140 ℃ for 60min at a low speed to obtain the high-resilience modified asphalt.
The crosslinking component is a mixture of sulfur and di-o-tolylguanidine, and the mass ratio is as follows: sulfur: di-o-tolylguanidine = 100.
4) Preparation of ready-mixed crushed stone
Heating the crushed stone aggregate to 210 ℃, placing the crushed stone aggregate in a stirrer, and mixing the crushed stone aggregate according to the mass ratio: and (3) adding the modified asphalt =100, and stirring for 50s to obtain the premixed macadam.
The broken stone aggregate is diabase, and the nominal grain size is 4.75-9.5 mm; the modified asphalt is SBS modified asphalt.
5) Preparation of bridge deck stress absorption layer material with high elastic recovery rate
The cement concrete is taken as a pavement base, the pavement base is cleaned before construction,ensuring no obvious dust, stone chips and impurities, heating the prepared high-resilience modified asphalt to 175 ℃, and spraying the high-resilience modified asphalt to a paved base surface, wherein the spraying amount is controlled to be 2.2kg/m 2 After the asphalt is spread, spreading the pre-mixed broken stone on the asphalt by using spreading equipment with the spreading amount of 19kg/m 2 After the spreading is finished, rolling the surface of the premixed broken stones by adopting compaction equipment, and finally cleaning the premixed broken stones which are not bonded on the surface to obtain the bridge deck stress absorbing layer material with high elastic recovery rate.
The performance indexes of the high-resilience modified asphalt prepared in the embodiment are shown in table 5:
TABLE 5 Performance index of high resilience modified asphalt prepared in example 3
| Test items | Unit of | Technical index |
| Softening point | ℃ | 97.7 |
| Ductility at 5 DEG C | cm | 45.6 |
| Elastic recovery at 25 DEG C | ％ | 99.8 |
| 5 ℃ elastic recovery | ％ | 93.5 |
| Time required for elastic recovery to 95% at 25 DEG C | s | 16 |
The performance criteria for the bridge deck stress absorbing layer material with high elastic recovery rate prepared in this example are shown in Table 6:
TABLE 6 bridge deck stress absorbing layer material performance index with high elastic recovery rate obtained in example 3
| Simulating dynamic load | Initial crack | 1cm | 2cm | 3cm | Terminal fissure |
| 0.6 stress ratio/10 Hz | 43500 | 48700 | 51350 | 56520 | 62400 |
The above results show that: the elasticity recovery capability of the high-resilience modified asphalt prepared by adopting the secondary independent swelling technology is obviously improved, and the bridge deck stress absorption layer material prepared by adopting the asphalt can effectively prevent crack reflection, so that the asphalt has obvious technical advancement and innovation.
The technical solutions above illustrate the technical idea of the present invention, and the scope of the present invention should not be limited thereby, and any changes and modifications made to the above technical solutions according to the technical essence of the present invention are all within the scope of the technical solutions of the present invention.
Claims (5)
1. A bridge deck stress absorbing layer material with high elastic recovery rate is characterized in that raw materials of the bridge deck stress absorbing layer material consist of high-resilience modified asphalt and premixed macadam, wherein the high-resilience modified asphalt is prepared by respectively and independently swelling rubber powder and SIS in matrix asphalt and then mixing for secondary swelling; wherein the mass ratio of the high-resilience modified asphalt to the pre-mixed crushed stone is 100 (620 to 1080);
the preparation method of the high-resilience modified asphalt comprises the following steps:
1) Independent swelling process of rubber powder in matrix asphalt
Heating the substrate asphalt to 160-170 ℃, preserving heat for 10-20min, placing the substrate asphalt in a high-speed shearing machine, then sequentially adding the surface activated rubber powder, the tackifying component and the compatibilization component, and shearing at a high speed for 10-20min; wherein the mass ratio of the matrix asphalt: surface activation of rubber powder: a tackifying component: the compatibilization component is (30) - (45): 4) - (6): 5) - (8) of 100; in the shearing process, the rotating speed is controlled to be 3000 to 6000rad/min, and the temperature is controlled to be 180 to 190 ℃; standing the sheared mixture at 130-150 ℃ for 30-40min to obtain rubber powder independent swelling asphalt;
2) Independent swelling process of SIS in base asphalt
Heating the matrix asphalt to 160-170 ℃, preserving heat for 10-20min, placing the matrix asphalt in a high-speed shearing machine, then sequentially adding SIS and the dispersing component, and shearing at a high speed for 20-30min; wherein the mass ratio of the matrix asphalt: SIS: the dispersion components are (10) - (16) and (3) - (7) respectively; the SIS is a styrene-polyisoprene-styrene block copolymer; the dispersion component is one of polyacrylamide and triethanolamine; in the shearing process, the rotating speed is controlled to be 5000 to 8000rad/min, and the temperature is controlled to be 180 to 190 ℃; standing the sheared mixture at 140-160 ℃ for 30-40min to obtain SIS independent swelling asphalt;
3) Hybrid two-shot swelling process
Heating the rubber powder independent swelling asphalt and the SIS independent swelling asphalt to 180-190 ℃ respectively, mixing, placing in a high-speed shearing machine, adding the crosslinking component, and shearing at high speed for 20-30min; wherein the mass ratio of the rubber powder to the independently swollen asphalt: SIS independent swelling asphalt: the cross-linking component =100 (100) - (140) (2) - (4); the crosslinking component is a mixture of sulfur and di-o-tolylguanidine with a mass ratio of 100 (20-40); in the shearing process, the rotating speed is controlled to be 2000 to 4000rad/min, and the temperature is controlled to be 180 to 190 ℃; stirring the sheared mixture at 140-160 ℃ for 30-60min to obtain the high-resilience modified asphalt;
the preparation method of the surface activated rubber powder in the step 1) comprises the following steps: preheating rubber powder at 50 to 55 ℃ for 80 to 120s, then adding a surface activation component A, stirring for 10 to 30min, increasing the temperature to 70 to 75 ℃, adding a surface activation component B, and stirring for 5 to 10min; wherein the mass ratio of the rubber powder: surface-activating component a: the surface activation component B =100 (5 to 20) and (2 to 6); finally, reducing the temperature to room temperature, and continuously stirring for 30 to 60min at room temperature to obtain surface activated rubber powder; the rubber powder is 80-mesh or 120-mesh bias tire vulcanized rubber powder; the surface activation component A is one or more of aromatic base rubber oil, aliphatic hydrocarbon solvent oil, furfural extract oil or low-sulfur light distillate oil which are mixed according to any proportion; the surface activation component B is a mixture of sodium dodecyl sulfate and acrylamide with the mass ratio of 100 (120-200).
2. The bridge deck stress absorbing layer material with high elastic recovery rate of claim 1, wherein the base asphalt of step 1) and step 2) is re-cross-linked 70# asphalt or re-cross-linked 90# asphalt, and the base asphalt used in step 1) and step 2) is the same; in the step 1), the tackifying component is one or more of terpene resin, C9 petroleum resin or C5 petroleum resin which are mixed according to any proportion; the compatibilization component is one or a mixture of methyl methacrylate, octadecyl acrylate, tert-butyl acrylate or dimethylaminoethyl methacrylate according to any proportion.
3. A bridge deck stress absorbing layer material having a high rate of resilient recovery according to claim 1, wherein said ready-mixed gravel is prepared by the steps of: heating the broken stone aggregate to 190-210 ℃, placing the broken stone aggregate in a stirrer, and crushing the broken stone aggregate according to the mass ratio: SBS modified asphalt =100 (0.4-0.8), adding the modified asphalt, stirring for 30-50s, and obtaining the ready-mixed macadam.
4. The bridge deck stress absorption layer material with high elastic recovery rate according to claim 3, wherein the crushed stone aggregate is one of basalt or diabase, and the nominal grain diameter is 9.5-13.2mm or 4.75-9.5 mm.
5. The preparation method of the bridge deck stress absorption layer material with high elastic recovery rate according to any one of claims 1 to 4, which is characterized by comprising the following steps:
cleaning a paving base surface before construction; heating the prepared high-resilience modified asphalt to 165-175 ℃, and spraying the high-resilience modified asphalt to a pavement base, wherein the spraying amount is controlled to be 1.8-2.2kg/m 2 (ii) a After the asphalt is spread, spreading pre-mixed macadam on the asphalt by spreading equipment, wherein the spreading quantity is 14-19kg/m 2 (ii) a After spreading, rolling the surface of the ready-mixed gravel by adopting compaction equipment; finally, the premixed macadam which is not bonded on the surface is cleaned, and the bridge deck stress absorption layer material with high elastic recovery rate is obtained.
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