Special modified cold-mixing asphalt for cold-region normal-temperature mixing-type asphalt concrete

Abstract

The invention provides special modified cold-mixing asphalt for cold-region normal-temperature mixing-type asphalt concrete, which comprises linear liquid SBS, heavy traffic asphalt, surfactant, organic additives and water. The weight percentages of the components are: 50 to 70 percent of heavy traffic asphalt, 2.5 to 15 percent of linear liquid SBS, 1.2 to 11 percent of cationic surfactant, 3 to 6 percent of organic additives, and 20 to 30 percent of water. The water and the cationic surfactant are mixed pro rata and then are fully mixed through an emulsifier to form soap liquid; the heavy traffic asphalt is heated to between 100 and 170 DEG C; the soap liquid is heated to between 45 and 80 DEG C; the heavy traffic asphalt, the soap liquid, the linear liquid SBS and the organic additives are rapidly mixed in a mixing-melting device; and a uniform stable suspended substance is formed through a grinding machine, fully stirred, cooled to normal temperature and stored, thus the asphalt can be obtained. The problem that cold-mixing asphalt is too fast to demulsify, unstable in performance, short in storage time and poor in regional adaptability is solved. Evaporation residue of the asphalt mixture can greatly improve pavement performance. In addition, the asphalt has the advantages of simple process, stable performance and wide use.

Description

technical field [0001] The invention relates to a cold-mix asphalt for highway pavement, in particular to a modified cold-mix asphalt specially used for normal-temperature mixing asphalt concrete in cold regions. Background technique [0002] A large number of asphalt is used as the pavement cementitious material for highway pavement. As a cementitious material, asphalt must first be heated and melted, and the high-grade pavement must be modified and processed. At the same time, the aggregate must be heated to 200°C, and then mixed. Under heat preservation, it will be transported, paved, and rolled to form asphalt pavement. All processes consume a lot of fuel and generate greenhouse gases. At the same time, the project construction is seriously affected by the climate, the process coordination requirements are strict, the material utilization rate is low, and the waste is serious. Seriously pollute the environment and the health of construction workers. [0003] Chinese ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a special modified cold-mix asphalt for normal-temperature mixing asphalt concrete in cold regions, which is used to replace hot asphalt or heat-modified asphalt, and solve the problem of too fast demulsification of cold-mix asphalt, unstable performance, and storage problems. Short time and poor adaptation to regional issues