Preparation method of low-cost anti-segregation anti-aging modified asphalt

Abstract

The invention discloses a preparation method of low-cost anti-segregation anti-aging modified asphalt, which adopts styrene butadiene styrene triblock copolymer (SBS), polyphosphoric acid (PPA), a stabilizer, rubber oil and other materials to modify 90 # A-grade road petroleum asphalt, thereby the low-cost anti-segregation anti-aging composite modified asphalt is prepared, and various performanceindexes of the 90 # grade-A road petroleum asphalt should meet the specification requirements. The use amount of the SBS is more than 2.5%; wherein the dosage of the stabilizer is more than 0.05%, andthe dosage of the rubber oil is more than 1.5%. The SBS modifier is added into the 90 # asphalt, stirring is carried out for 30 minutes by adopting a constant-temperature stirrer, the stabilizer andthe rubber oil are doped into the swollen modified asphalt, shearing is performed for 40 minutes by adopting a high-speed shearing machine, the condition that a large number of bubbles are generated on the surface of the asphalt in the shearing process can be observed and the shearing rate basically does not change suddenly, and the shearing is completed. According to the invention, the use amountof SBS can be reduced by about 0.6%-0.8%, and the cost can be reduced by at least 81 yuan / ton.

Description

technical field [0001] The invention relates to the technical field of composite modified asphalt, in particular to a method for preparing low-cost segregation-resistant and aging-resistant modified asphalt. Background technique [0002] The use of modifiers to modify asphalt has a long history in foreign countries. In the middle of the 19th century, vulcanization was used to reduce the penetration and increase the softening point. In 1873, Samue Wgite applied for a patent on adding 1% natural rubber to asphalt to modify asphalt. In the past 50 years, the development of modified asphalt has roughly gone through four stages. From 1950 to 1960, rubber powder or latex was directly mixed into the asphalt and used evenly; from 1960 to 1970, styrene-butadiene synthetic rubber was mixed and used in the form of latex; from 1971 to 1988, in addition to synthetic rubber, continued In addition to use, thermoplastic resins have been widely used; since 1988, SBS has gradually become th...

AI Technical Summary

Problems solved by technology

First, the polymer modifier has poor compatibility with petroleum asphalt, and the polymer modification mechanism is physical modification, which has poor storage stability and is prone to segregation; second, the polymer modifier is expensive ; Third, the physical modification method of polymers is complicated to operate and requires high equipment, so it needs to be changed and used now

[0004] The existing modified asphalt generally has problems such as high cost, poor aging resistance, short storage period, and low application penetration rate.

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