High-viscosity modified asphalt material and preparation method thereof

Abstract

The invention discloses a high-viscosity modified asphalt material. The asphalt material is prepared from the following raw materials in parts by mass: 100 parts of matrix asphalt, 4-7 parts of a thermoplastic elastomer, 4-10 parts of waste rubber powder or an ethylene-vinyl acetate copolymer, 1-3 parts of a plasticizer, 2-4 parts of thermoplastic resin, 3-5 parts of a solubilizer, 0.2-2 parts ofa stabilizer, 0.5-1.5 parts of a chemical modifier and 0.2-0.7 part of polypropylene glycol. Through the high-viscosity modified asphalt material, the storage stability of high-viscosity modified asphalt is improved; meanwhile, high-temperature viscosity of the high-viscosity modified asphalt is reduced; when the high-viscosity modified asphalt material is applied to mixing of asphalt mixture, themixing temperature is low; the high-viscosity modified asphalt material is easy to construct, low in cost and simple in preparation method.

Description

technical field [0001] The invention relates to the technical field of road engineering materials, in particular to a high-viscosity modified asphalt material and a preparation method thereof. Background technique [0002] With the increasing traffic volume and axle load and the high temperature in summer, the fluidity damage and channelized traffic on the asphalt pavement caused by the combined effect of high temperature and wheel rolling are becoming more and more serious, and a large number of rutting, wrapping and cracking appear on the asphalt pavement and other damage. Rutting damage on asphalt pavement causes excessive deformation of the pavement, affects the smoothness of the pavement, weakens the strength of the surface layer and the overall structure of the pavement, and induces other pavement diseases. High-viscosity modified asphalt refers to the modified asphalt whose absolute viscosity is greater than 20,000 Pa·s at 60°C. Because of its good high-temperature s...

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Problems solved by technology

[0003] SBS is used in CN104725883B, activated rubber powder, tackifying resin, aromatic hydrocarbon oil, plasticizer, sulfur; the activated rubber process is complex, difficult to control, and the amount of rubber powder is large, which is not conducive to industrial production, and the problem of segregation still exists

What used in CN107974091A is rubber powder, SBS, plasticizer, resin and waste phosphoric acid ester, this technical scheme does not contain polyphosphoric acid, economical efficiency is worse, also does not possess the chemical modification of polyphosphoric acid to asphalt, and structure is even worse Stable, poor storage and aging resistance, and the effect of waste phosphate is not as good as mono-bis-alkyl phosphate

CN104559235B uses polyphosphoric acid, higher aliphatic alcohol, aromatic hydrocarbon oil, rubber, dispersant, silane coupling agent, shortcoming is only relying on the chemical action between polyphosphoric acid and base asphalt can't reach the service requirement of high viscosity of drainage pavement, low temperature resistance The cracking property cannot be guaranteed, and the conversion rate of mono-alkyl phosphate in the generated alkyl phosphate is not high, which is the limitation of higher fatty alcohols

However, due to the differences in molecular weight, density, viscosity, etc. between most polymer materials and asphalt, it is difficult to disperse the polymer in asphalt, and it is not completely compatible with asphalt, resulting in poor storage stability of the modified asphalt system at high temperature and easy separation. layer, which affects the quality of modified asphalt, normal construction and the service life of asphalt pavement; at the same time, the viscosity of high-viscosity asphalt is too high, which leads to the problem of ease of construction, which cannot be ignored