CN-121990788-A - Epoxy resin regenerated asphalt mixed material and preparation method thereof

Abstract

The invention discloses an epoxy resin regenerated asphalt mixed material and a preparation method thereof, wherein the mixed material comprises aggregate, RAP and asphalt, and further comprises a treatment additive, wherein the treatment additive comprises, by weight, 30-80 parts of epoxy resin, 40-80 parts of a curing agent, 3-10 parts of a softening agent, 5-15 parts of a regenerating agent, 1-3 parts of an anti-aging agent and 1-5 parts of an accelerator. According to the invention, the epoxy resin premix component and the curing agent premix component are respectively prepared, then the aggregate and the RAP are preheated, the asphalt material and the premix component are sequentially added, and the mixture is stirred and mixed and then discharged. The three-dimensional network structure of the epoxy resin is utilized to remarkably improve the high-temperature stability, fatigue resistance and durability of the reclaimed asphalt mixture, and meanwhile, the high-efficiency utilization of high-proportion RAP is realized by optimizing the proportion and the technological parameters, so that the problem of insufficient performance of the traditional reclaimed material is solved. The method is suitable for heavy traffic pavement such as high-grade highways, airport runways and the like, and has remarkable technical and economic benefits and environmental protection value.

Inventors

• LIU FA
• MIN ZHAOHUI
• ZHOU JIN
• HU JING
• LUO SANG
• ZHANG DELONG
• HOU JUE
• WANG HOUZHI

Assignees

• 江苏省交通工程建设局
• 东南大学

Dates

Publication Date

20260508

Application Date

20251223

Claims (10)

1. 1. The epoxy resin regenerated asphalt mixed material comprises aggregate, RAP and asphalt, and is characterized by further comprising treatment additives, wherein the treatment additives comprise the following components in parts by weight: 30-80 parts of epoxy resin; 40-80 parts of curing agent; 3-10 parts of softener; 5-15 parts of a regenerant; 1-3 parts of an anti-aging agent; 1-5 parts of a promoter; In the materials of the mixed materials, the dosage of the treatment additive is set to 8-15% of the total weight of the asphalt material, the asphalt material is set to 4-5% of the total weight of the aggregate, and the dosage of the RAP is set to 30-70% of the total weight of the aggregate; the preparation method of the treatment additive comprises the following steps: S1, mixing epoxy resin, a regenerant and an anti-aging agent, heating to 90-110 ℃, stirring and reacting for 3-6 hours to obtain a first mixed component, heating to 80-100 ℃, and preserving heat and storing; S2, mixing the curing agent, the softening agent and the accelerator, heating to 70-90 ℃, stirring and reacting for 3-6 hours to obtain a second mixed component, heating to 60-80 ℃, and preserving heat and storing; s3, mixing the first mixed component and the second mixed component, adding an accelerator into the mixture, and uniformly stirring to obtain the treatment additive.
2. 2. The epoxy resin reclaimed asphalt mixture as claimed in claim 1, wherein the aggregate is granite, the RAP is road milling material, and the asphalt material is matrix asphalt or modified asphalt.
3. 3. The epoxy resin reclaimed asphalt mixture of claim 2 wherein the asphalt is 70# road petroleum asphalt.
4. 4. The epoxy resin reclaimed asphalt mixture according to claim 1, wherein the epoxy resin having an epoxy value in the range of 0.40 to 0.55eq/100g is used in the treatment additive; The epoxy resin is one of bisphenol a type epoxy resin, bisphenol F type epoxy resin and novolac epoxy resin, or a combination of any two or more of bisphenol a type epoxy resin, bisphenol F type epoxy resin and novolac epoxy resin.
5. 5. The epoxy resin reclaimed asphalt mixture according to claim 4, wherein the curing agent is an amine curing agent, and the amine curing agent is one of an aliphatic amine, an aromatic amine, a modified amine, a polyurethane curing agent and an acid anhydride curing agent, or a combination of any two or more of the aliphatic amine, the aromatic amine, the modified amine, the polyurethane curing agent and the acid anhydride curing agent.
6. 6. The epoxy resin reclaimed asphalt mixture according to claim 1, wherein the softener is one of a petroleum softener, a plant softener, a coal softener and a synthetic softener, or a combination of any two or more of a petroleum softener, a plant softener, a coal softener and a synthetic softener.
7. 7. The epoxy resin-reclaimed asphalt mixture according to claim 1, wherein the reclaiming agent is one of a petroleum-based reclaiming agent, a plant-based reclaiming agent, a synthetic reclaiming agent and a composite reclaiming agent, or a combination of any two or more of a petroleum-based reclaiming agent, a plant-based reclaiming agent, a synthetic reclaiming agent and a composite reclaiming agent.
8. 8. The epoxy resin reclaimed asphalt mixture according to claim 1, wherein the aging inhibitor is one of a hindered phenol aging inhibitor, an amine aging inhibitor and a phosphite aging inhibitor, or a combination of any two or more of the hindered phenol aging inhibitor, the amine aging inhibitor and the phosphite aging inhibitor.
9. 9. The epoxy resin reclaimed asphalt mixture according to claim 1, wherein the accelerator is one of a tertiary amine accelerator, an imidazole accelerator, a quaternary ammonium salt accelerator and an organometallic salt accelerator, or a combination of any two or more of a tertiary amine accelerator, an imidazole accelerator, a quaternary ammonium salt accelerator and an organometallic salt accelerator.
10. 10. The method for preparing the epoxy resin reclaimed asphalt mixture according to any one of claims 1 to 9, which is characterized by comprising the following steps: S1, heating aggregate to 180-220 ℃, adding RAP, and stirring for 5-10 seconds; S2, adding asphalt into the aggregate, and stirring the asphalt and the aggregate to uniformly mix the asphalt and the aggregate; And S3, adding the treatment additive obtained by combining the first mixed component, the second mixed component and the accelerator into a mixing cylinder, combining with the mixture of asphalt materials and aggregate, stirring and mixing for 30-80 seconds, and discharging.

Description

Epoxy resin regenerated asphalt mixed material and preparation method thereof Technical Field The invention relates to the technical field of road engineering materials, in particular to an epoxy resin reclaimed asphalt mixed material and a preparation method thereof. Background Along with the continuous increase of road maintenance and reconstruction engineering, a large amount of waste asphalt mixture (RAP) needs to be recycled. Conventional reclaimed asphalt mixtures typically recover the performance of RAP by adding a regenerant and a softener, but their road performance (such as high temperature stability, fatigue resistance, and durability) tends to be lower than new ones. The epoxy resin modified asphalt is a high-performance material, and can obviously improve the strength and the service life of asphalt mixture. However, when the epoxy resin is applied to a reclaimed asphalt mixture, there are problems in that the compatibility of the epoxy resin with old asphalt is poor, the curing process is difficult to control, construction difficulties are easily caused, and the like. Therefore, the epoxy resin regenerated asphalt mixed material and the preparation method thereof are researched and developed to solve the problems, realize the efficient utilization of RAP and have important technical and economic significance. Disclosure of Invention Aiming at the problems, the invention aims to provide an epoxy resin reclaimed asphalt mixture and a preparation method thereof, wherein the epoxy resin reclaimed asphalt mixture prepared by the method comprises the steps of respectively preparing an epoxy resin premix component and a curing agent premix component, preheating aggregate and RAP, sequentially adding asphalt materials and premix components, stirring and mixing, discharging, effectively recovering the plasticity of the RAP by a regenerant and a softener, improving the rheological property of old asphalt, inhibiting ageing of the material by an anti-aging agent, prolonging the service life, accelerating the curing reaction by an accelerator, and improving the construction efficiency. In order to achieve the above object, the present invention provides the following technical solutions: the epoxy resin regenerated asphalt mixed material comprises aggregate, RAP and asphalt, and also comprises treatment additives, wherein the treatment additives comprise the following components in parts by weight: 30-80 parts of epoxy resin; 40-80 parts of curing agent; 3-10 parts of softener; 5-15 parts of a regenerant; 1-3 parts of an anti-aging agent; 1-5 parts of a promoter; In the materials of the mixed materials, the dosage of the treatment additive is set to 8-15% of the total weight of the asphalt material, the asphalt material is set to 4-5% of the total weight of the aggregate, and the dosage of the RAP is set to 30-70% of the total weight of the aggregate; the preparation method of the treatment additive comprises the following steps: S1, mixing epoxy resin, a regenerant and an anti-aging agent, heating to 90-110 ℃, stirring and reacting for 3-6 hours to obtain a first mixed component, heating to 80-100 ℃, and preserving heat and storing; S2, mixing the curing agent, the softening agent and the accelerator, heating to 70-90 ℃, stirring and reacting for 3-6 hours to obtain a second mixed component, heating to 60-80 ℃, and preserving heat and storing; s3, mixing the first mixed component and the second mixed component, adding an accelerator into the mixture, and uniformly stirring to obtain the treatment additive. Preferably, in the above technical solution, the aggregate is set as granite, the RAP is set as road milling material, and the asphalt material is set as matrix asphalt or modified asphalt. Preferably, in the above technical solution, the asphalt material is set as 70# road petroleum asphalt. Preferably, in the above technical solution, an epoxy resin having an epoxy value ranging from 0.40 to 0.55eq/100g is used in the treatment additive; The epoxy resin is one of bisphenol a type epoxy resin, bisphenol F type epoxy resin and novolac epoxy resin, or a combination of any two or more of bisphenol a type epoxy resin, bisphenol F type epoxy resin and novolac epoxy resin. Preferably, in the above technical solution, the curing agent is an amine curing agent, where the amine curing agent is one of aliphatic amine, aromatic amine, modified amine, polyurethane curing agent and anhydride curing agent, or any two or more of aliphatic amine, aromatic amine, modified amine, polyurethane curing agent and anhydride curing agent. Preferably, in the above-described aspect, the softener is one of a petroleum softener, a plant softener, a coal softener, and a synthetic softener, or a combination of any two or more of a petroleum softener, a plant softener, a coal softener, and a synthetic softener. Preferably, in the above-described aspect, the regenerating agent is one of a petroleum-based regenerating agent, a plant-