TY - JOUR
T1 - The durability of cementitious composites containing microencapsulated phase change materials
AU - Wei, Zhenhua
AU - Falzone, Gabriel
AU - Wang, Bu
AU - Thiele, Alexander
AU - Puerta-Falla, Guillermo
AU - Pilon, Laurent
AU - Neithalath, Narayanan
AU - Sant, Gaurav
N1 - Funding Information:
The authors acknowledge financial support for this research provisioned via an Infravation ERA-NET Plus Grant (31109806.0001), the National Science Foundation (CMMI: 1130028, CAREER: 1253269) and California Energy Commission (Contract: PIR: 12-032). The authors also kindly acknowledge financial support provided by The Sustainable L.A. Grand Challenge and Office of the Vice-Chancellor for Research at UCLA. The contents of this paper reflect the views and opinions of the authors, who are responsible for the accuracy of datasets presented herein. The Laboratory for the Chemistry of Construction Materials (LC2) and the Molecular Instrumentation Center at UCLA gratefully acknowledge the support that has made their operations possible.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/8/1
Y1 - 2017/8/1
N2 - This study investigates the durability of cementitious composites containing microencapsulated phase change materials (PCMs). First, the stability of the PCM's enthalpy of phase change was examined. A reduction of around 25% in the phase change enthalpy was observed, irrespective of PCM dosage and aging. Significantly, this reduction in enthalpy was not caused by mechanical damage that was induced during mixing, but rather by chemical interactions with dissolved SO42- ions. Second, the influence of PCM additions on water absorption and drying shrinkage of PCM-mortar composites were examined. PCM microcapsules reduced the rate and extent of water sorption; the former was due to their non-sorptive nature which induces hindrances in moisture movement, and the latter was due to dilution, i.e., a reduction in the volume of sorptive cement paste. On the other hand, PCM inclusions did not influence the drying shrinkage of cementitious composites, due to their inability to restrain the shrinkage of the cement paste. The results suggest that PCMs exert no detrimental influences on, and, in specific cases, may even slightly improve the durability of cementitious composites.
AB - This study investigates the durability of cementitious composites containing microencapsulated phase change materials (PCMs). First, the stability of the PCM's enthalpy of phase change was examined. A reduction of around 25% in the phase change enthalpy was observed, irrespective of PCM dosage and aging. Significantly, this reduction in enthalpy was not caused by mechanical damage that was induced during mixing, but rather by chemical interactions with dissolved SO42- ions. Second, the influence of PCM additions on water absorption and drying shrinkage of PCM-mortar composites were examined. PCM microcapsules reduced the rate and extent of water sorption; the former was due to their non-sorptive nature which induces hindrances in moisture movement, and the latter was due to dilution, i.e., a reduction in the volume of sorptive cement paste. On the other hand, PCM inclusions did not influence the drying shrinkage of cementitious composites, due to their inability to restrain the shrinkage of the cement paste. The results suggest that PCMs exert no detrimental influences on, and, in specific cases, may even slightly improve the durability of cementitious composites.
KW - Cement paste
KW - Concrete
KW - Durability
KW - Enthalpy
KW - Phase change materials
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U2 - 10.1016/j.cemconcomp.2017.04.010
DO - 10.1016/j.cemconcomp.2017.04.010
M3 - Article
AN - SCOPUS:85019020065
SN - 0958-9465
VL - 81
SP - 66
EP - 76
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -