Cold-mix phase change type asphalt mixture for thermal energy storage

Abstract

The invention provides a cold-mix phase change type asphalt mixture for thermal energy storage, which is characterized in that: the asphalt mixture is prepared by normal-temperature mixing aggregates, porous base phase change particles for thermal energy storage, a filling material, water, and emulsified bitumen or modified emulsified bitumen with a mass ratio being 100:20-100:1-3:2-4:5-8. The porous base phase change particles for thermal energy storage are prepared by using porous fire rock aggregates as a matrix, absorbing an organic solid-liquid phase changing material in a pore structure of the matrix in a vacuum condition, coating a thermosetting resin film containing a heat conductive filling material on the surface by an immersion method, and solidifying the film for 2-4 days under normal temperature, wherein the phase change temperature is 40-70 DEG C, the phase change latent heat is 20-60j / g, and mechanical properties are good. The asphalt mixture has advantages of simple preparation technology, energy saving and environmental protection, and has good efficacy for reducing pavement 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...

AI Technical Summary

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