Warm-mixed modified asphalt and preparation method therefor

Abstract

The invention discloses warm-mixed modified asphalt and a preparation method therefor. Modified asphalt is prepared through mixing lightweight low-molecular-weight oil resulting from scrap tire cracking and polypropylene macromolecular wax resulting from waste plastic cracking with a curing agent and a coupling agent, pavement paving is carried out through subjecting the modified asphalt with an asphalt mixture bitumen aggregate ratio of 3.5% to 4.5%, cement with a weight ratio of 3% to 5% and coarse and fine aggregates to stirring and mixing at a temperature of 110 DEG C to 120 DEG C, then, the about 100 DEG C mixing, 100 DEG C paving and fast curing forming of an asphalt mixture can be achieved, the difficulty of construction is lowered, and pavement performance is guaranteed while the construction cycle is shortened; energy consumption is lowered, the emission of noxious fumes is reduced, the emission of greenhouse gases and smoke dust is reduced, and the injury to construction personnel is reduced; compared with a hot-mixing technology, the warm-mixed modified asphalt is lower in requirements and wider in adaptability; and furthermore, waste tires and waste plastics are reprocessed and reutilized, so that resources can be saved, and an environment-friendly development idea is conformed.

Description

technical field [0001] The invention relates to the technical field of modified asphalt pavement, in particular to a warm-mix modified asphalt and a preparation method thereof. Background technique [0002] At present, the laying of asphalt pavement basically adopts the hot mix hot paving technology of hot mix asphalt mixture HMA. During the production of HMA, the asphalt is heated from room temperature to about 150°C, the mineral material is heated from room temperature to 150-180°C, and then the asphalt and aggregate are mixed at a high temperature of about 160°C. The temperature of HMA after mixing is not lower than 140°C, the temperature during paving and rolling shall not be lower than 110°C. Heating asphalt and aggregates to such a high temperature not only consumes a lot of energy, but also emits a lot of waste gas and dust during production and construction, which seriously affects the quality of the surrounding environment and the health of construction workers. Th...

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Problems solved by technology

Heating asphalt and aggregates to such a high temperature not only consumes a lot of energy, but also emits a lot of waste gas and dust during production and construction, which seriously affects the quality of the surrounding environment and the health of construction workers. The use of hot mixing technology requires a lot of energy consumption, and will also cause a lot of greenhouse gas and smog and dust emissions, which is not in line with the sustainable development policy of my country's and the world's green, low-carbon and environmental protection

[0003] During the production of hot mix asphalt mixture, asphalt and mineral materials need to be heated to a higher temperature, which consumes a lot of energy. As the temperature rises, the emission of toxic fumes is also greater, polluting the environment; coupled with the operating intensity High, smoky, and physically and mentally harmful to construction workers; and hot-mix asphalt mixture production technology requires high professional equipment and personnel, which makes it unfavorable for construction and development in remote areas. On the one hand, most of the traditional hot mix asphalt mixtures use high-quality raw materials, and the utilization of waste materials is relatively limited.

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