Modified asphalt composition and preparation method thereof

Abstract

The invention provides a modified asphalt composition and a preparation method thereof. The modified asphalt composition comprises, by weight, 87.5% to 98.9% of base asphalt, 1% to 10% of a modifier and 0.1% to 2.5% of a gelatinizing agent (a structure improver). The preparation method comprises the following steps: uniformly dispersing the modifier into the base asphalt at a temperature of 150 to 260 DEG C by using equipment like an ordinary agitator, a high speed shearing machine or a colloid mill to prepare the modified asphalt composition; and adding the gelatinizing agent to allow a sol-gel type colloid structure of asphalt to be converted into a gel type colloid structure and to allow a stable colloid structure of asphalt to be formed. According to the invention, the preparation method for the modified asphalt composition is simple; and the prepared modified asphalt composition has a high softening point, high viscosity, a high penetration index, excellent high and low temperature performance, excellent ageing resistance, small temperature sensitivity and the like, can reduce occurrence of damages like tracks and upheaval on a pavement and prolong a maintenance period of the pavement and is applicable to construction of high-grade highways.

Description

technical field

[0001] The invention relates to a modified asphalt composition and a preparation method thereof, in particular to a modified asphalt composition and a preparation method thereof which can improve high-temperature stability, anti-aging performance, temperature sensitivity and other performances. The modified asphalt product prepared by the invention can be used in road construction, building waterproofing, hydraulic anti-seepage and other engineering constructions. Background technique

[0002] Due to regional differences, some areas have a large temperature difference between winter and summer, and the use environment of asphalt pavement is harsh. In addition, due to the rapid increase in traffic volume, large-scale vehicles, heavy and overloaded vehicles, etc., the current asphalt pavement has high temperature rutting, low temperature cracking and water damage. Damage and other phenomena are still relatively serious. In addition, for some asphalt processed ...