Heat-Storage Asphalt Pavement Composition Using Sol-Gel Coated PCM-Impregnated Fine Aggregate
This technology relates to an asphalt pavement composition and its manufacturing method, which incorporates fine aggregate impregnated with phase change materials (PCM) and coated with a silica gel thin film via a sol-gel process, replacing a portion of the total fine aggregate.
Conventional asphalt pavements struggle to maintain consistent heat storage performance due to temperature fluctuations, and there have been challenges in stably containing phase change materials within aggregates to prevent leakage.
By impregnating activated carbon with phase change materials and sealing them within the aggregate using a silica gel thin film, this technology ensures that the pavement composition effectively provides heat storage performance without the risk of PCM leakage.
Key Features:
- A composition containing fine aggregate where 60–80% by weight of the total fine aggregate is replaced with activated carbon fine aggregate impregnated with phase change materials and coated with a silica gel thin film.
- Fine aggregate manufactured by vacuum-impregnating 100 parts by volume of tetradecane phase change material with 80 parts by volume of porous activated carbon fine aggregate.
- Impregnated aggregate manufactured by allowing the PCM-impregnated fine aggregate to solidify at a temperature below its phase change point.
- A sol-gel coating layer consisting of a silica gel thin film formed on the surface of the fine aggregate under conditions of pH 3–4 for the sol solution and pH 7–8 during gelation.
