Impregnation of Lightweight Aggregate Particles with Phase Change Material for Its Use in Asphalt Mixtures
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Phase change materials (PCM) are widely investigated nowadays for building applications due to their ability of passive heating and cooling, thus regulating indoor temperature. Recently, PCMs have been studied also as additives of asphalt binders for road applications. However, PCM modifications of asphalt binder limits the effect due to the low amount of binder (5–6%wt.) used in asphalt mixtures. In order to increase the PCM content in a mixture an effective option may consist of modifying aggregate particles as main mixture component (94–95%wt.). In this research, foam glass and burnt expanded clay (agriculture beads) particles are impregnated with PCM (Tetradecane, Tmelt = 6 °C) and investigated for relatively low temperature applications. PCM impregnation together with the protective coating and sealing of these PCM soaked lightweight aggregate (LWA) particles are performed in the lab. The particles are coated using epoxy adhesives combined with Ordinary Portland Cement (OPC). The results reveal that porous lightweight particles are indeed promising PCM carriers and comparatively easy to impregnate with liquid PCM. However, the choice of coating technique depends on the final application as hot, warm or cold mix asphalt.
KeywordsTetradecane Low temperature distresses Specific heat capacity Asphalt pavement
The authors would like to acknowledge the Swiss National Science Foundation (SNSF) for the financial support of the project number 200021_169396 and Dr. Thomas Lüthi at Center for X-ray Analytics for conducting CT-Scan test.
- Kakar MR, Refaa Z, Bueno M, Worlitschek J, Stamatiou A, Partl MN (2019a) Investigating bitumen’s direct interaction with Tetradecane as potential phase change material for low temperature applications. Road Mater Pavement Des, 1–8Google Scholar
- Kakar MR, Refaa Z, Worlitschek J, Stamatiou A, Partl MN, Bueno M (2018) Use of microencapsulated phase change materials in bitumen to mitigate the thermal distresses in asphalt pavements. In: RILEM 252-CMB-Symposium on Chemo Mechanical Characterization of Bituminous Materials. Springer, Cham, pp 129–135Google Scholar
- Kissock JK, Hannig JM, Whitney TI, Drake ML (1998) Testing and simulation of phase change wallboard for thermal storage in buildings. In: Proceedings of the International Solar Energy Conference, New York, USA, pp 45–52Google Scholar
- Wycoff JC (1959) Suitability of lightweight aggregate for bituminous plant mix. ASTM Bull 235:33–36Google Scholar
- Zhang MH, Gjvorv OE (1991) Mechanical properties of high-strength lightweight concrete. Mater J 88(3):240–247Google Scholar