CN213173184U

CN213173184U - BRA and SBS composite modification's double-deck bituminous paving maintenance structure

Info

Publication number: CN213173184U
Application number: CN202021043400.8U
Authority: CN
Inventors: 豆莹莹; 金光来
Original assignee: Jiangsu Zhongyi Road New Materials Co ltd
Current assignee: Jiangsu Zhongyi Road New Materials Co ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-05-11
Anticipated expiration: 2030-06-09

Abstract

The utility model provides a BRA and SBS composite modification's double-deck bituminous paving maintenance structure, which comprises a road surface, bituminous paving maintenance structure is laminated composite construction, has set gradually AC-20 bituminous mixture's middle surface layer system and SMA-13 bituminous mixture's last surface layer system on the road surface, all be provided with the adhesion coating between road surface, AC-20 bituminous mixture's middle surface layer system and SMA-13 bituminous mixture's the last surface layer system. The utility model discloses a bituminous mixture and the double-deck bituminous paving maintenance structure that excels in of composite modification preparation can effectively improve bituminous paving's high temperature anti rutting nature, low temperature crack resistance and durability, makes bituminous paving's road performance obtain holistic promotion from the aspect of material performance and structure, prolongs road surface life, provides new scheme and guide the thinking for bituminous paving's maintenance mode.

Description

BRA and SBS composite modification's double-deck bituminous paving maintenance structure

Technical Field

The utility model relates to a bituminous paving maintains the maintenance structure, especially relates to a BRA and SBS composite modification's double-deck bituminous paving maintains the structure.

Background

The asphalt pavement has the advantages of good mechanical property, high driving safety and comfort, convenient maintenance and repair and the like, and is the main structural form of the high-grade highway pavement in China. However, in the long-term service process of the asphalt pavement, due to the influence of repeated vehicle loads and external environmental factors, the pavement performance of the asphalt mixture is gradually weakened, and the pavement diseases such as rutting, cracking, pit and the like are generated, wherein the rutting diseases are one of main disease forms influencing the pavement flatness and the service performance, and if the accumulated deformation of rutting is too fast, the damage of the pavement is accelerated. Therefore, it is necessary to adopt an effective pavement maintenance mode to integrally improve the pavement performance from the pavement material performance and the pavement structure and prolong the service life.

Buton Rock Asphalt (BRA) is a high-ash Rock Asphalt with an ash content of up to 75%, and is often used as a petroleum Asphalt modifier because it coexists with the natural environment for a long time, is chemically stable, and is more compatible with road petroleum Asphalt than a high-molecular polymer modifier. Relevant researches show that after the asphalt mixture is doped with BRA for modification, the high-temperature stability, the low-temperature crack resistance, the water damage resistance and the durability of the asphalt mixture are obviously improved. But the combined structure form of the BRA and SBS composite modified asphalt mixture is relatively less applied to maintenance and repair of the asphalt pavement.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is overcome the defect that prior art exists, the utility model provides a BRA and SBS composite modification's double-deck bituminous paving maintenance structure wholly promotes the road surface performance from material performance and structural style, makes to have more the practicality.

In order to solve the technical problem, the utility model discloses a technical scheme is: a BRA and SBS composite modified double-layer asphalt pavement maintenance structure comprises a pavement, the asphalt pavement maintenance structure is a layered composite structure, a middle surface layer system of an AC-20 asphalt mixture and an upper surface layer system of an SMA-13 asphalt mixture are sequentially arranged on the pavement, and adhesive layers are arranged among the pavement, the middle surface layer system of the AC-20 asphalt mixture and the upper surface layer system of the SMA-13 asphalt mixture.

Further, the thickness of the AC-20 asphalt mixture is 6-8 cm, and the thickness of the SMA-13 asphalt mixture is 4-6 cm.

Furthermore, the adhesive layer is SBS modified high-viscosity emulsified asphalt, and the thickness of the adhesive layer is 0-0.1 cm.

Compared with the prior art, the beneficial effects of the utility model include:

the BRA and SBS composite modified asphalt mixture is adopted, so that mixing construction is easy, and construction cost is lower; compared with a wet process, the preparation method of the composite modified asphalt mixture by adopting the dry process has better modification effect of the composite mixture; the adopted high-viscosity emulsified asphalt adhesive layer can effectively improve the bonding strength between asphalt layers and also can prevent the infiltration and infiltration of water.

By adopting a double-layer structure form of BRA and SBS composite modified continuous grading BSAC-20 and discontinuous grading BSSMA-13 asphalt mixture, the structural strength of the pavement is efficiently reinforced by increasing the thickness of the pavement, the high-temperature anti-rutting capability of the asphalt pavement is improved, and the service life of the pavement is effectively prolonged; the utility model discloses adopt BRA and SBS composite modification's continuous gradation BSAC-20 and discontinuous gradation BSSMA-13 bituminous mixture's bilayer structure form for the first time for rock asphalt BRA's application is from continuous gradation to discontinuous gradation's application and popularization.

Drawings

The disclosure of the present invention is explained with reference to the drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:

FIG. 1 is a schematic diagram showing a BRA and SBS composite modified double-layer asphalt pavement maintenance structure.

Reference numbers in the figures: 1-SBS modified high-viscosity emulsified asphalt adhesive layer, 2-AC-20 asphalt mixture middle surface layer and 3-SMA-13 asphalt mixture upper surface layer.

Detailed Description

It is easily understood that, according to the technical solution of the present invention, a plurality of alternative structural modes and implementation modes can be proposed by those skilled in the art without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.

An embodiment according to the present invention is shown in conjunction with fig. 1. A BRA and SBS composite modified double-layer asphalt pavement maintenance structure comprises a pavement, the asphalt pavement maintenance structure is a layered composite structure, a middle surface layer 2 system of an AC-20 asphalt mixture and an upper surface layer 3 system of an SMA-13 asphalt mixture are sequentially arranged on the pavement, and adhesive layers are arranged among the pavement, the middle surface layer system of the AC-20 asphalt mixture and the upper surface layer system of the SMA-13 asphalt mixture. The thickness of the AC-20 asphalt mixture is 6-8 cm, and the thickness of the SMA-13 asphalt mixture is 4-6 cm. The adhesive layer is an SBS modified high-viscosity emulsified asphalt adhesive layer 1, and the thickness of the adhesive layer is 0-0.1 cm.

The composite modified asphalt mixture AC-20 and SMA-13 are prepared by adopting a dry method, firstly, metered BRA and aggregate heated to a test temperature are put into a mixing pot together for stirring for 60s, so that BRA particles are fully and uniformly dispersed in the aggregate, then SBS modified asphalt is added for mixing for 90s, and finally preheated mineral powder is added for mixing for 60s, and the total mixing time is 3.5 min. The well mixed asphalt mixture should have uniform particle distribution, no agglomeration and caking, full asphalt coating, no white material and no serious segregation of coarse and fine aggregates.

The preparation method of the SBS modified high-viscosity emulsified asphalt adhesive layer comprises the following steps:

1) adding 0-9 parts of high-molecular elastomer material, 0-5 parts of polyethylene wax or ethylene vinyl acetate wax, 0-5 parts of viscosity reducer and 0-5 parts of modified asphalt stabilizer into 600 parts of 450-doped asphalt to prepare modified asphalt;

2) adding 1-10 parts of emulsifier and 0.1-3 parts of emulsified asphalt stabilizer into 500 parts of 300-one water, and mixing to obtain soap liquid;

3) mixing the soap solution and the modified asphalt according to the mass ratio of 1: 1 grinding and emulsifying by a modified asphalt colloid mill to obtain a target product.

Wherein the high molecular elastomer material is one or a mixture of any two of a styrene and butadiene block copolymer SBS, a styrene butadiene rubber SBR, a hydrogenated styrene-butadiene block copolymer SEBS, a styrene-ethylene-propylene-styrene type block copolymer SEPS, a styrene-isoprene-styrene triblock copolymer SIS and a hydrogenated styrene-isoprene-styrene triblock copolymer hydrogenated SIS. The modified asphalt stabilizer is one or a mixture of sulfur and a vitamin connecting agent. The emulsified asphalt stabilizer is one or a mixture of any two of sodium carboxymethylcellulose, hydroxyethyl cellulose, hydroxypropyl methylcellulose, hydroxypropyl cellulose, CaCl2 and NH4 Cl.

The softening point of evaporation residues of the SBS modified high-viscosity emulsified asphalt adhesive layer is as high as more than 90 ℃. The penetration degree is more than 30cm, and the extensibility at 15 ℃ is more than 100 cm.

In the construction process, the original road surface of the damaged road section is milled and planed to the lower surface layer, and then an emulsified asphalt spraying vehicle is adopted to spray 0.3-0.4L/m²Spraying the high-viscosity modified emulsified asphalt, forming a viscous layer after demulsification and solidification of the high-viscosity modified emulsified asphalt, then paving a composite modified middle surface layer, rolling and forming, and then spraying 0.2-0.3L/m²The spraying amount is used for carrying out the construction of the adhesive layer, and finally, the composite modified upper surface layer is paved and the construction of the composite modified double-layer asphalt pavement maintenance structure can be completed after rolling and forming.

The utility model discloses pavement maintenance adopts double-deck composite construction to through the superior performance of BRA and SBS composite modified asphalt mixture, make road performances such as asphalt pavement's high temperature anti-rutting, low temperature are anti splits and water-resistant harm all obtain obvious improvement, extension road surface life.

In this embodiment, the composite modified BSAC-20 and BSSMA-13 asphalt mixture has better water stability, high temperature performance and low temperature performance, and the specific performance is shown in the following table:

the technical scope of the present invention is not limited to the content in the above description, and those skilled in the art can make various modifications and alterations to the above embodiments without departing from the technical spirit of the present invention, and these modifications and alterations should fall within the protection scope of the present invention.

Claims

1. The BRA and SBS composite modified double-layer asphalt pavement maintenance structure comprises a pavement and is characterized in that the asphalt pavement maintenance structure is a layered composite structure, a middle surface layer system of an AC-20 asphalt mixture and an upper surface layer system of an SMA-13 asphalt mixture are sequentially arranged on the pavement, and adhesive layers are arranged among the pavement, the middle surface layer system of the AC-20 asphalt mixture and the upper surface layer system of the SMA-13 asphalt mixture.

2. The BRA and SBS composite modified double-layer asphalt pavement maintenance structure according to claim 1, wherein the thickness of the AC-20 asphalt mixture is 6-8 cm, and the thickness of the SMA-13 asphalt mixture is 4-6 cm.

3. The BRA and SBS composite modified double-layer asphalt pavement maintenance structure of claim 1, wherein the adhesive layer is SBS modified high-viscosity emulsified asphalt with a thickness of 0-0.1 cm.