Warm mixed asphalt cement and preparation method thereof

Abstract

The invention relates to warm mixed asphalt cement and a preparation method thereof. 100 percent of warm mixed asphalt cement comprises the following components in percentage by weight: 90.0-97.0 percent of asphalt cement, 2.0-8.0- percent of rheological modification agent and 0.5-5.0 percent of macromolecular polymer, wherein the rheological modification agent is formed by combining the following substances: (a) byproducts produced in a petroleum refining process, wherein the weight content of aromatics is 50-80 percent, and the kinematic viscosity at 100 DEG C is 20 mm<2> / s to 70 mm<2> / s; and (b) derivatives produced in petrochemical industry, coal chemical industry and forestry chemical industry; through the warm mixed asphalt cement, the high-temperature rutting resistance, low-temperature tensile strength and resistance to brittle fracture of the asphalt cement are improved while energy conservation and environmental protection are realized; the asphalt cement is mainly applied to construction and maintenance of various grades of highways and municipal roads, and is particularly suitable for cities, parks and tunnels with higher environmental protection requirements.

Description

technical field [0001] The invention relates to an asphalt binder and a preparation method thereof, in particular to a warm-mix asphalt binder for road engineering and a preparation method thereof. Background technique [0002] In recent years, under the voice of energy saving and emission reduction in various countries in the world, an environment-friendly warm mix asphalt mixture has come out in various forms and has been widely used in Europe, North America, South Africa, East Asia and other places. Compared with traditional hot-mix asphalt mixture, the warm-mix asphalt mixture has lower mixing, paving, and compaction temperatures, which can significantly save fuel consumption, reduce toxic and harmful gas and smoke emissions, and avoid asphalt binders in the mixing process. Serious problems such as thermal aging and performance attenuation occur in the At present, the commonly used warm mixing process can be classified into two categories: the first is the organic addit...

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Problems solved by technology

Compared with the traditional hot mixing process, the temperature of mixing, paving, and compaction is lowered by 30°C to 50°C, which significantly reduces heat energy consumption, reduces toxic and harmful gas and dust emissions, and avoids serious thermal aging of asphalt binder during the mixing process. Based on the attenuation of performance and performance, focus on solving the following problems existing in the existing warm-mix asphalt technology: ①Warm-mix asphalt additives make it difficult to restore the performance of asphalt binder, resulting in lower low-temperature tensile and brittle crack resistance; ②Warm-mix asphalt The compatibility between additives and base asphalt is not good, and they are easy to separate out, and asphalt production enterprises cannot realize large-scale industrial production; ③Warm mix asphalt additives containing ionic surfactants have different selection adaptability to different mineral materials, Minerals with the same charge exhibit insufficient adhesion, resulting in reduced asphalt cohesive strength and ultimately water damage

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