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CN-122011788-A - Asphalt composite modifier and preparation method thereof, modified asphalt binder and preparation method and application thereof

CN122011788ACN 122011788 ACN122011788 ACN 122011788ACN-122011788-A

Abstract

The invention belongs to the technical field of asphalt materials, and particularly relates to an asphalt composite modifier which comprises, by weight, 60-90 parts of fly ash, 10-40 parts of reclaimed oil and 0-5 parts of interface coupling accelerator, wherein the reclaimed oil is adsorbed and fixed on the surface and pore structures of fly ash particles, and the modifier is in a powder form or a particle form. The invention upgrades the industrial solid waste fly ash from the traditional filler to the functional carrier, realizes high-doping and high-value utilization of large solid waste, effectively reduces the problems of occupied land and environmental pollution caused by the piling of the fly ash, and simultaneously, the reclaimed oil agent adopts the reclaimed waste engine oil reclaimed liquid, vegetable oil and the like to recycle or low-cost raw materials, thereby avoiding resource waste and conforming to the concept of circular economy. The whole technical route does not need high-energy processing, and the carbon emission and the environmental load are greatly reduced.

Inventors

  • ZHOU WEI
  • LIU WENQING

Assignees

  • 江西赣能股份有限公司

Dates

Publication Date
20260512
Application Date
20260227

Claims (10)

  1. 1. The asphalt composite modifier is characterized by comprising, by weight, 60-90 parts of fly ash, 10-40 parts of reclaimed oil and 0-5 parts of interface coupling accelerator; wherein the reclaimed oil agent is adsorbed and fixed on the surface and in the pore structure of the fly ash particles, and the modifier is in powder or particle shape.
  2. 2. A modified asphalt binder is characterized by comprising matrix asphalt and 10% -40% by weight of the matrix asphalt of the composite modifier of claim 1.
  3. 3. A method of preparing the composite modifier of claim 1, comprising the steps of: drying the fly ash; adding a reclaimed oil agent into the fly ash under the condition of heating and stirring, so that the reclaimed oil agent is adsorbed by the fly ash and immobilized composite particles are formed; And adding an interface coupling accelerator into the immobilized composite particles for surface modification, and cooling to obtain the composite modifier, or granulating after cooling to obtain the composite modifier.
  4. 4. A method for preparing a modified asphalt binder according to claim 2, wherein the matrix asphalt is heated and stirred, and the composite modifier is gradually added at the temperature according to 10% -40% of the weight of the matrix asphalt, so that the matrix asphalt is uniformly dispersed and then cooled to obtain the modified asphalt binder.
  5. 5. Use of the modified asphalt binder of claim 2 in the preparation of hot mix asphalt or recycled asphalt from old asphalt pavement.
  6. 6. The composite modifier according to claim 1, wherein the fly ash has one or more performance indexes including CaO content of 5% -20%, loss of ignition (LOI) of less than or equal to 8%, median particle diameter D50 of 5-40 μm and specific surface area of 0.2-10 m2/g.
  7. 7. The asphalt composite modifier according to claim 6, wherein the reclaimed oil is selected from the group consisting of a reclaimed waste engine oil liquid, a vegetable oil, a biological oil and a petroleum oil fraction, and the reclaimed oil has a viscosity of 50-500 at 60 DEG C The acid value is less than or equal to 5mgKOH/g, and has compatibility with asphalt.
  8. 8. The asphalt composite modifier according to claim 7, wherein the load of the reclaimed oil agent is 10% -30% based on the total mass of the modifier.
  9. 9. The asphalt composite modifier according to claim 8, wherein the interface coupling accelerator is selected from amine anti-stripping agents, silane coupling agents or surfactants, the amount of the interface coupling accelerator is 0.5% -3.0% of the mass of the fly ash, and if the modifier is in a particle shape, the particle size of the modifier is 1-5 mm.
  10. 10. The method of claim 4, wherein the compound modifier is added and then sheared and stirred to promote the diffusion and uniform distribution of the reclaimed oil and fly ash components.

Description

Asphalt composite modifier and preparation method thereof, modified asphalt binder and preparation method and application thereof Technical Field The invention belongs to the technical field of asphalt materials, and particularly relates to an asphalt composite modifier and a preparation method thereof, a modified asphalt binder and a preparation method and application thereof. Background In road engineering, asphalt binder is used as core cementing material and mixed with mineral aggregate to form asphalt mixture, which is widely applied to various road surface paving. However, the asphalt material has inherent defects of strong temperature sensitivity, easy rutting at high temperature, easy cracking at low temperature, insufficient adhesion with aggregate, weak water damage resistance and the like, and is subject to the effects of repeated load, rain and snow erosion, temperature alternation and other environmental factors of vehicles in the long-term service process, and the pavement is easy to generate rutting, cracking, peeling and other diseases, thereby seriously affecting the service quality and service life of the road. In order to improve the road performance of asphalt materials, various modification techniques have been developed in the industry, such as modifying binders by blending polymers, or optimizing cement properties by using fiber reinforced blend structures, or by adding mineral fillers such as limestone mineral powder. The mineral filler mainly improves the viscosity of asphalt cement and the interface adhesion effect through the micro filling effect, but the filler can only realize the performance adjustment of a physical layer due to the lack of chemical activity, has limited modification potential, and is difficult to fundamentally solve the problem of unbalanced high-low temperature performance of asphalt materials. In recent years, fly ash is used as a large amount of industrial byproducts generated by coal-fired power plants, and has micron-sized spherical morphology, a certain specific surface area and potential activity (mainly composed ofEqual oxide composition) is tried to be applied to the field of asphalt materials. In the prior art, the fly ash is added in a form of partially replacing limestone mineral powder, so that the rheological property of asphalt cement can be improved to a certain extent, the high-temperature stability of the mixture can be improved, and the adhesiveness between asphalt and aggregate can be enhanced, but the application is still limited to the traditional thought of 'physical filling replacement', and the active components and interface action potential of the fly ash cannot be fully activated, so that the functional utilization degree is low, and high-value conversion cannot be realized. In the field of recycling of old asphalt pavement materials (RAP), the traditional technology is to recover the ductility and fluidity of aged asphalt by directly adding low-viscosity recycling oil agents (such as used engine oil recycling liquid, vegetable oil, biological oil and the like). However, the method has the obvious defects that the high-temperature rutting resistance of the regenerated asphalt is greatly reduced due to the disposable addition of the regenerated oil agent, the oil agent is easy to volatilize and run off in the use process, the distribution uniformity is poor, and the long-term stable regeneration effect cannot be realized. To solve this problem, the industry gradually explores the technology of slow release of regenerant, for example, by wrapping the regenerant with porous inorganic carrier or microcapsule to realize the gradual release of the regenerant, so as to delay the aging of asphalt and provide the self-healing capability to the material. However, the technology generally has the problems of complex process, high production cost, large-scale production difficulty and the like, and is difficult to meet the actual popularization and application requirements of engineering. In summary, the prior art has two main core bottlenecks that firstly, the application of the fly ash in asphalt materials is remained on the 'filler replacement' level, a functional cooperative utilization path is lacking, the pore structure, the active components and the asphalt modification requirement of the fly ash cannot be effectively combined, secondly, in the asphalt regeneration technology, the traditional regenerated oil agent using mode cannot be compatible with low-temperature performance recovery and high-temperature stability maintenance, and the novel slow release technology is limited by cost and technology and is difficult to industrialize. Therefore, development of a technical scheme integrating high-value utilization of solid waste, modification of asphalt and regeneration function is needed, the problems of optimizing comprehensive performance of asphalt materials, stabilizing RAP regeneration effect and the like are solved while large-scal