High performance fiber asphalt chip seal flexible crack resistant seal coat

Abstract

This utility model relates to a high-performance fiber-reinforced asphalt macadam flexible crack-resistant seal layer, laid between the road base course and the asphalt surface course or between asphalt surface course layers. Its key feature is that it comprises, from bottom to top: an adhesive layer, laid on the base course, a continuous film layer formed of modified asphalt material; and a crack-resistant base fabric layer, formed of synthetic fiber nonwoven geotextile, whose fiber surface and pores are completely impregnated and bonded by the modified asphalt in the adhesive layer. The adhesive layer achieves sealing of the base course by using modified asphalt to penetrate micro-cracks, and simultaneously provides an adhesive medium for the crack-resistant base fabric layer. The bonded crack-resistant base fabric, under the action of its three-dimensional limiting grid, can disperse the load after base course deformation. The macadam interlocking structure in the asphalt premixed macadam seal layer can block crack propagation, providing crack protection. Below the crack-resistant base fabric, through reverse osmosis and interlayer bonding of the adhesive layer, the crack-resistant base fabric and the adhesive layer form a stress absorber, preventing base course cracks from reflecting onto the road surface course.

Description

Technical Field

[0001] This utility model belongs to the field of road engineering, and specifically designs a high-performance fiber asphalt macadam flexible crack-resistant sealing layer. Background Technology

[0002] Conventional road paving mostly involves directly laying asphalt on the old base layer. Traditional road surface layers are prone to cracking due to reflective cracks in the base layer, temperature stress, and load fatigue, which affects the service life of the surface pavement. Utility Model Content

[0003] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a high-performance fiber-reinforced asphalt macadam flexible crack-resistant sealing layer.

[0004] The technical solution adopted in this utility model is as follows: it is laid between the road base layer and the asphalt surface layer or between the asphalt surface layers, and comprises, from bottom to top, the following components:

[0005] The adhesive layer, laid on the base layer, is a continuous film layer formed of modified bitumen material;

[0006] The crack-resistant base layer is formed of synthetic fiber nonwoven geotextile, and its fiber surface and pores are completely impregnated and bonded by the modified bitumen of the adhesive layer.

[0007] The premixed asphalt macadam seal is composed of macadam that is completely coated with modified asphalt and tightly embedded. The macadam is partially embedded in the asphalt binder of the crack-resistant base layer below, and the macadam forms an interlocking structure.

[0008] As a preferred embodiment of this invention, the synthetic fiber nonwoven geotextile is a polypropylene filament needle-punched structure.

[0009] As a preferred embodiment of this invention, the modified asphalt material is styrene-butadiene block copolymer (SBS) modified asphalt, rubber powder modified asphalt, or a composite modified asphalt of two of these.

[0010] As a preferred embodiment of this invention, the crushed stone is made of basalt or diabase, and the nominal particle size of the crushed stone is 3-8 mm.

[0011] As a preferred embodiment of this invention, the surface coverage of the crushed stone in the sealing layer is 70%-90%.

[0012] As a preferred embodiment of this invention, the thickness of the anti-crack base fabric layer is 1.8-3.5 mm.

[0013] As a preferred embodiment of this invention, the amount of asphalt used in the premixed asphalt gravel seal is 1.5%-2.5% of the mass of the gravel.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention is a high-performance fiber-reinforced asphalt-aggregate flexible crack-resistant seal. The adhesive layer utilizes modified asphalt to penetrate micro-cracks in the base layer, achieving a seal. Simultaneously, the adhesive layer provides the bonding medium for the crack-resistant base fabric layer. The bonded crack-resistant base fabric, under its three-dimensional limiting grid, can disperse the load after base layer deformation. Furthermore, the aggregate interlocking structure in the asphalt-aggregate seal can block crack propagation, thus protecting the base layer from cracking. Beneath the crack-resistant base fabric, the reverse osmosis and interlayer adhesion of the adhesive layer form a stress-absorbing body, preventing base layer cracks from reflecting onto the road surface. It also forms a waterproof layer to prevent damage to the base layer from rainwater, effectively isolating and delaying the formation of road surface cracks and extending the service life of the highway. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] In the diagram: 1. Adhesive layer; 2. Crack-resistant base fabric layer; 3. Asphalt premixed aggregate seal layer;

[0019] 21. Synthetic fiber nonwoven geotextile. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] The following is combined Figure 1 This invention describes a specific embodiment of a high-performance fiber-reinforced asphalt macadam flexible crack-resistant sealing layer, laid between the road base course and the asphalt surface layer or between asphalt surface layers, comprising, from bottom to top:

[0023] Adhesive layer 1, which can be laid on a rigid or semi-rigid base layer, is a continuous film layer formed by modified asphalt material, which is sprayed onto the base layer;

[0024] The crack-resistant base layer 2 is formed by synthetic fiber nonwoven geotextile 21. Its fiber surface and pores are completely impregnated and bonded by the modified asphalt in the adhesive layer 1. The crack-resistant base layer 2 is bonded to the interlayer through reverse infiltration of the modified asphalt material in the adhesive layer 1, so that the synthetic fiber nonwoven geotextile 21 and the adhesive layer 1 form a stress-absorbing structure to prevent the upward reflection of base layer cracks. At the same time, under the action of synthetic fiber nonwoven geotextile 21, a stress-absorbing layer and a waterproof layer are formed, which can prevent road surface rainwater from damaging the base layer, effectively isolate and delay the generation of road surface cracks, and extend the service life of the highway.

[0025] The pre-mixed asphalt macadam seal layer 3 is composed of macadam completely coated with modified asphalt and tightly embedded. The macadam is partially embedded in the asphalt binder of the crack-resistant base fabric layer 2 below, and an interlocking structure is formed between the macadam. Modified asphalt pre-mixed macadam is used, and the macadam is simultaneously spread and compacted. After compaction, the macadam is embedded in the crack-resistant base fabric layer 2, forming an interlocking structure between the macadam. While the pre-mixed asphalt macadam seal layer 3 covers the crack-resistant base fabric layer 2, it forms a multi-layer crack-resistant structure with the bonding layer 1 and the crack-resistant base fabric layer 2, so that the seal layer avoids the foundation cracks reflecting to the surface layer.

[0026] In this preferred embodiment, the synthetic fiber nonwoven geotextile 21 is a polypropylene filament needle-punched structure. Utilizing the high tensile strength and modulus of polypropylene filaments, they are intertwined through a needle-punching process to form a three-dimensional network structure, which can effectively disperse the load after the base layer deforms, reduce the concentration of deformation stress, and reduce the deformation of the surface layer.

[0027] In this embodiment, the modified asphalt material is styrene-butadiene block copolymer (SBS) modified asphalt or rubber powder modified asphalt. The modified asphalt has low-temperature flexibility, achieving high permeability with the base fabric's confined pores, while also having high viscosity characteristics to improve the bonding strength with the base layer. During construction, the modified asphalt is sprayed onto the base layer, and then synthetic fiber nonwoven geotextile 21 is laid and compacted using a rubber-tired roller to ensure that the modified asphalt in the bonding layer 1 is completely impregnated.

[0028] Furthermore, the crushed stone is made of basalt or diabase, and the nominal particle size of the crushed stone is 3-8 mm.

[0029] In this embodiment, the surface coverage of the crushed stone in the sealing layer is 70%-90% to balance the sealing and deformation space in the sealing layer and improve stress absorption performance.

[0030] In this embodiment, the thickness of the anti-crack base fabric layer 2 is 1.8-3.5 mm.

[0031] In some embodiments, the amount of asphalt used in the premixed asphalt seal 3 is 1.5%-2.5% of the mass of the crushed stone.

[0032] Working principle of this utility model:

[0033] The base layer is cleaned and milled.

[0034] The modified asphalt bonding layer 1 is sprayed to form a continuous film layer, which partially penetrates the micro-cracks in the base layer to form a seal, while providing a reverse osmosis bonding interface for the crack-resistant base fabric layer 2.

[0035] Polypropylene filament geotextile was laid and compacted and impregnated using a rubber-tired roller. The polypropylene filament geotextile was completely impregnated with asphalt. The three-dimensional grid of the polypropylene filament geotextile absorbed the stress of the cracks and formed a waterproof barrier with the bonding layer 1.

[0036] Premixed asphalt aggregate is sprayed and simultaneously compacted into shape. The aggregate is embedded in the split base fabric and the bonding layer 1, and interlocked with the crack-resistant base fabric layer 2.

[0037] Lay the upper asphalt surface layer;

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A high performance fiber bituminous macadam flexible anti-cracking seal coat, laid between a road base layer and a bituminous surface layer or between bituminous surface layers, characterized in that, The compounds from bottom to top include: Adhesive layer (1), laid on the base layer, is a continuous film layer formed of modified bitumen material; The crack-resistant base fabric layer (2) is formed of synthetic fiber nonwoven geotextile (21), and its fiber surface and pores are completely impregnated and bonded by the modified bitumen of the adhesive layer (1). The premixed asphalt seal (3) is composed of tightly embedded crushed stones completely coated with modified asphalt. The crushed stones are partially embedded in the asphalt binder of the crack-resistant base layer (2) below, and an interlocking structure is formed between the crushed stones.

2. The flexible crack resistant seal coat of claim 1, wherein: The synthetic fiber nonwoven geotextile (21) has a polypropylene filament needle-punched structure.

3. The flexible crack resistant seal coat of claim 1, wherein: The modified asphalt materials are styrene-butadiene block copolymer (SBS) modified asphalt and rubber powder modified asphalt.

4. The flexible crack resistant seal coat of claim 1, wherein: The crushed stone is made of basalt or diabase, and the nominal particle size of the crushed stone is 3-8 mm.

5. The flexible crack resistant seal coat of claim 1, wherein: The thickness of the anti-crack base fabric layer (2) is 1.8-3.5 mm.

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