Improvement of thermal performance of mortars by using heat storage aggregate made with industrial by‐product to reduce cooling load
Summary The usage of waste materials as building materials can be an important method to reduce energy consumption and decrease natural resource usage in the construction industry. In this work, phase change materials (PCMs) were incorporated with industrial by‐product materials as an aggregate to p...
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Veröffentlicht in: | International journal of energy research 2022-01, Vol.46 (1), p.308-318 |
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Sprache: | eng |
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The usage of waste materials as building materials can be an important method to reduce energy consumption and decrease natural resource usage in the construction industry. In this work, phase change materials (PCMs) were incorporated with industrial by‐product materials as an aggregate to produce mortars, which can improve the energy efficiency and improve the environment of buildings. Bottom ash (BA), a by‐product from coal‐fired power plants, was directly impregnated into paraffin, a PCM, to produce a heat storage aggregate (HSA). The raw materials of the HSA production were characterized by X‐ray diffraction, scanning electron microscope, and differential scanning calorimeter. The mortar mixes had a water to cement ratio of 1:2 and a sand to cement ratio of 2.5:1. Six mixtures were prepared with different HSA amounts of 0%, 10%, 20%, 30%, 40%, and 50% by volume. The compressive strength, density, and thermal properties of the mortars were investigated. The results and analyses showed that the compressive strength and density of the mortars decreased with increasing HSA amounts. The thermal conductivity of HSA mortars slightly decreased for increasing levels of HSA. In addition, HSA mortars showed a significant increase in time lags when the HSA content increased, up to approximately 165% to 197% higher than that of the control mortars. HSA levels in mortars can play an important role in improving the heat conductance into buildings.
In this paper, heat storage aggregate (HSA) was fabricated by directly impregnation of bottom ash (BA) into paraffin. HSA was used as a sand replacement up to 50% by volume to produce mortars. The HSA mortars showed a significant increase in time lags up to 197% higher than that of the control mortars while the thermal conductivity of HSA mortars slightly decreased for increasing levels of HSA. In addition, there is no liquid leakage on the surface of the HSA mortar after placing in the real weather for 20 days. |
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ISSN: | 0363-907X 1099-114X |
DOI: | 10.1002/er.6735 |