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Asphalt modifier for reactive semi-flexible pavement as well as preparation method and application of asphalt modifier

An asphalt modifier and semi-flexible pavement technology, which is applied to the coagulation pavement, roads, roads and other directions of on-site paving, can solve the problems of difficult to obtain rubber asphalt, long road maintenance period, easy aging and degradation of asphalt, etc. Shorten open traffic time, avoid repeated heating, overcome hard-to-get effects

Active Publication Date: 2022-07-01
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers use rubber asphalt to improve the crack resistance and bonding performance of asphalt mixture. However, since most of the semi-flexible pavement projects are maintenance projects, the amount of a single project is small, and rubber asphalt is not easy to obtain and extremely inconvenient to use; Another example is that researchers obtain organic-inorganic composite pavements based on interface modification and pouring. The asphalt used is high-viscosity asphalt, but it also has problems such as difficulty in obtaining, inconvenient use, and easy aging and degradation of asphalt in small projects after repeated heating.
In addition, the interface modifier used has the disadvantages of complicated preparation method and long pavement maintenance period.

Method used

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  • Asphalt modifier for reactive semi-flexible pavement as well as preparation method and application of asphalt modifier
  • Asphalt modifier for reactive semi-flexible pavement as well as preparation method and application of asphalt modifier
  • Asphalt modifier for reactive semi-flexible pavement as well as preparation method and application of asphalt modifier

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Experimental program
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Effect test

preparation example Construction

[0044] The preparation method of the above-mentioned reactive semi-flexible pavement asphalt modifier will be described in detail below, which comprises the following steps:

[0045] The preparation steps of the micronized SBC-based mixture: mixing 60-80 parts by mass of the micronized SBC-based polymer, 20-40 parts by mass of a solubilizer, 1-3 parts by mass of a release agent and 10-20 parts by mass of a warm-mixing The mixture is stirred and mixed for 5min-10min to obtain a powdery micronized SBC mixture;

[0046] The preparation steps of the polyurethane prepolymerization system: provide 20-40 parts by mass of the polyurethane prepolymerization system for sealing and preservation;

[0047] The prepared micronized SBC-based mixture and the polyurethane prepolymerization system are stored in a non-contact manner. Therefore, the above-mentioned preparation steps of the micronized SBC-based mixture and the polyurethane prepolymerized system are in no particular order.

[0048...

Embodiment 1

[0055] Table 2 shows the components and their contents of the asphalt modifier provided in this example.

[0056] Table 2 Composition and mass fraction of asphalt modifier for reactive semi-flexible pavement

[0057]

[0058] Wherein, the melting agent is the mixture of DOP and naphthenic oil of equal quality, the anti-sticking agent is talcum powder, and the warm mix agent is pentaerythritol stearate, Fischer-Tropsch wax and polyethylene wax whose mass ratio is 2:1:1 mixture.

[0059] In this embodiment, the particle size of the micronized SBC-based polymer is 60 mesh (ie, 250 μm), and the micronized SBC-based polymer is a mixture of micron SBS and micron SEBS with a mass ratio of 4:1.

[0060] The asphalt modifier in this example was prepared by the following method. On the one hand, firstly, the SBC-based polymer was micronized by a grinding system to obtain a micronized SBC-based polymer (with a particle size of 60 meshes); The parts by mass shown in the above table 2...

Embodiment 2

[0066] Table 3 shows the components and their contents of the asphalt modifier provided in this example.

[0067] Table 3 Composition and mass fraction of asphalt modifier for reactive semi-flexible pavement

[0068]

[0069] Wherein, the melting agent is the mixture of DOP and naphthenic oil whose mass ratio is 1:2, the anti-sticking agent is calcium carbonate, and the warm-mixing agent is pentaerythritol stearate, Fischer-Tropsch, whose mass ratio is 2:0.5:1.5 A mixture of wax and polyethylene wax.

[0070] In this embodiment, the particle size of the micronized SBC-based polymer is 50 meshes (ie, 300 μm), and the micronized SBC-based polymer is a mixture of micron SBS and micron SEBS with a mass ratio of 9:1.

[0071] The asphalt modifier in this example was prepared by the following method. On the one hand, firstly, the SBC-based polymer was micronized by a grinding system to obtain a micronized SBC-based polymer (with a particle size of 50 meshes); The parts by mass ...

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Abstract

The invention discloses a reactive asphalt modifier for a semi-flexible pavement and a preparation method of the reactive asphalt modifier. The reactive asphalt modifier comprises a micron SBC mixture and a polyurethane pre-polymerization system which are in non-contact and are respectively stored. The asphalt modifier can be directly and externally added into an asphalt mixing station for dry mixing to realize modification, is convenient to use, can be added at any time, is simple in preparation method and is suitable for large-scale popularization and application. The asphalt modifier provided by the invention can be applied to preparation of a macroporous asphalt mixture, and is further used for preparing a semi-flexible pavement. The asphalt modifier not only can avoid the particle falling phenomenon of the semi-flexible macroporous pavement in the slurry pushing process, but also can reduce the mixing temperature of the mixture and reduce harmful gas emission and environmental pollution. The asphalt modifier forms a reinforcing and toughening structure through reaction, and can overcome the problem of pavement cracking caused by weak cement-asphalt interface to a certain extent; in addition, early strength can be improved, so that road traffic opening time is shortened.

Description

technical field [0001] The invention belongs to the technical field of traffic engineering admixtures, and in particular relates to a reaction-type asphalt modifier for semi-flexible pavement, a preparation method thereof, and its application in preparing semi-flexible pavement. Background technique [0002] With the service of asphalt pavement and the emergence of overloaded and heavy-duty traffic, asphalt pavement rutting is serious, especially in areas where vehicles brake frequently, such as intersections and bus stops. Semi-flexible pavement is a kind of rigid and flexible composite pavement structure formed by pouring special cement colloid into large-pore asphalt mixture. , has been widely recognized and studied in the diagnosis and treatment of heavy-duty traffic problems. [0003] Semi-flexible pavement is a cement asphalt composite pavement structure, and its performance is closely related to the performance of macroporous asphalt mixture, cement grouting material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L75/04C08L91/00C08L91/06C08K5/12C08K3/34C08K5/103E01C7/26
CPCC08L95/00E01C7/26C08L2205/035C08L2201/08C08L53/02C08L53/025C08L75/04C08L91/00C08L91/06C08K5/12C08K3/34C08K5/103Y02A30/30
Inventor 程金梁洪锦祥邓成朱晓斌龚明辉熊子佳彭刚褚辞
Owner JIANGSU SOBUTE NEW MATERIALS
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