Abstract
This study explores the effects of microencapsulated phase change materials (MPCM) on the mechanical propertiesand heat storage performance of alkali-activated ground granulated blast furnace-fly ash compositecementitious materials (AGFM). The cementitious material consists of 70 % ground granulated blast furnace(GGBF) and 30 % fly ash (FA). Two MPCM with high compatibility are incorporated into the alkali-activatedcementitious materials, and various tests are performed to evaluate their feasibility for use in building thermalenergy storage, including hydration heat, compressive strength, heat storage, and release behavior. Temperatureregulation experiments show that samples with phase change materials (PCM) can effectively mitigatetemperature fluctuations, maintaining lower temperatures during controlled heating, and higher temperaturesduring natural cooling, which is crucial for energy-saving building materials. Furthermore, based on the apparentheat capacity method, a multi-field coupling model of hydration kinetics-temperature-field-phase-change for thecomposite paste was established. The simulation results are highly consistent with experimental data (maximumglobal error δ_G < 3.5 %, maximum peak temperature error δ_(phf) < 1.6 %), providing theoretical support forsubsequent research.
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