A cold-mix phase-change heat-storage asphalt mixture

Abstract

The present invention proposes a cold-mix phase-change heat-storage asphalt mixture, which is characterized in that it is mixed at room temperature by aggregates, porous base phase-change heat-storage particles, fillers, water, emulsified asphalt or modified emulsified asphalt, each Mass ratio of raw materials Aggregate: porous base phase change heat storage particles: filler: water: emulsified asphalt or modified emulsified asphalt = 100: 20~100: 1~3: 2~4: 5~8. Porous-based phase-change heat storage particles are based on porous igneous rock aggregates. Under vacuum conditions, organic solid-liquid phase-change materials are adsorbed in the pore structure of the matrix, and the surface is coated with a thermosetting resin film layer containing thermally conductive fillers by immersion method. , It is obtained by curing at room temperature for 2-4 days, its phase transition temperature is 40-70°C, its latent heat of phase transition is 20-60J / g, and its mechanical properties are good. The preparation process of the invention is simple, energy-saving and environment-friendly, and has a good effect of reducing road surface temperature.

Description

technical field [0001] The invention belongs to the technical field of functional pavement materials, in particular to a cold-mixed phase-change heat storage type asphalt mixture. Background technique [0002] Asphalt pavement is widely used in the construction of highways, urban roads, airports and other transportation facilities due to its advantages such as high flatness, good driving comfort, and low noise. However, asphalt is a material with strong heat absorption, especially in areas where extreme high-temperature weather occurs frequently in summer. The high temperature often exceeds 40°C, and the high temperature lasts for a long time, and the road surface temperature is extremely high. On the other hand, the high-temperature pavement continues to store heat, dissipate heat, and release organic volatiles to the atmosphere, which intensifies the urban heat island effect and pollutes the environment. Emulsified asphalt has better fluidity at room temperature, can be u...

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Problems solved by technology

[0004] Chinese patent CN101029216A "A self-regulating road phase change material and its production method" proposes a kind of fatty acid, potassium sulfate, chitosan, polyacrylamide, floating beads, brucite, pyrophyllite, silicone emulsion, A phase-change material composed of ten kinds of paraffin and sodium hydroxide in a certain mass ratio. The temperature adjustment mechanism is theoretically analyzed, but how to apply it to roads is not mentioned.

Chinese patent CN101333094A "preparation method of a kind of phase-change asphalt pavement material" proposes to prepare phase-change asphalt modifier by phase-change material, silica sol, support material and coupling agent under the condition of coagulant, wherein chlorine Calcium chloride or magnesium chloride, but the addition of calcium chloride coagulant to silica sol will reduce the crystallization performance of norethylene glycol, and even form a complex structure, which will greatly reduce the crystallinity of polyethylene glycol, resulting in phase Decreased latent heat (see Liu Shaohua et al., Research on the Interaction of Polyethylene Glycol and Calcium Ion, Journal of Biomedical Engineering, 1990, 7 (4); Zhuang Jinshu, Characterization of Polyethylene Glycol and Calcium Chloride Formation Complex, Journal of Fujian Normal University (Natural Science Edition) 1991, 7 (2)); Prepare phase change asphalt pavement materials with phase change asphalt modifier and aggregate, filler, asphalt, fiber