Warm-mix asphalt additive and preparation method thereof

Abstract

The invention relates to a warm-mix asphalt additive and a preparation method thereof. The additive comprises the following components in percentage by weight: 87 to 98 percent of chemical modification latex, 0.5 to 12 percent of lubricative and peeling resistant cation surfactant and 0.1 to 2.0 percent of acid. The method comprises the following steps of: heating the chemical modification latex to the temperature of between 40 and 80 DEG C with stirring, and dripping 0.1 to 0.5 percent of acid slowly; adding the lubricative and peeling resistant cation surfactant, stirring fully, and dispersing uniformly; and continuing to drip 0.1 to 1.5 percent of acid slowly, stirring uniformly, keeping the temperature of between 40 and 80 DEG C and storing for later use. By the warm-mix asphalt additive and the preparation method, the viscosity of asphalt binders during mixing can be reduced effectively, the reduction performance of asphalt cements and adhesivity between the asphalt cements and aggregates can be improved, the water damage resistance and durability of warm-mix asphalt mixtures can be improved, the tensile strength of asphalt can be improved, and the rutting resistance, fatigueresistance and low temperature resistance of the warm-mix asphalt mixtures can be enhanced.

Description

technical field [0001] The invention relates to a warm-mix asphalt additive, in particular to a preparation method of the warm-mix asphalt additive. Background technique [0002] Patent CN 101302348A discloses "A Warm Asphalt Mixture and Its Preparation Method": Put the hot ore with a weight ratio of 90wt% to 96wt% and a temperature of 140°C to 155°C into the mixing pot, and add an appropriate proportion at a temperature of The hot asphalt binder at 140°C-155°C is mixed for 20s-30s, and then a certain amount of warm-mix asphalt modifier Sasobit is added, and stirred for 20s-30s to prepare warm-mix asphalt mixture. Using this method to prepare warm-mix asphalt mixture, the production process is simple, and the high-temperature performance of the asphalt mixture is good, but its additives are not obvious for reducing the mixing temperature and rolling temperature of the asphalt mixture, and it is difficult to overcome its high production cost, Reduction that affects the elong...

AI Technical Summary

Problems solved by technology

By selecting high-concentration cationic chemically modified latex as the base masterbatch of warm-mix asphalt additives, and at the same time adding cationic surfactants with proper proportions that can play a lubricating role and anti-stripping performance, the existing warm-mix asphalt additives can solve the problem of reducing the asphalt binder. Poor performance and poor adhesion performance, thereby improving the water damage resistance, rutting resistance, fatigue resistance, low temperature resistance and other properties of warm mix asphalt mixture

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