TY - JOUR
T1 - Early-age temperature evolutions in concrete pavements containing microencapsulated phase change materials
AU - Young, Benjamin A.
AU - Falzone, Gabriel
AU - She, Zhenyu
AU - Thiele, Alexander M.
AU - Wei, Zhenhua
AU - Neithalath, Narayanan
AU - Sant, Gaurav
AU - Pilon, Laurent
N1 - Funding Information:
The authors acknowledge financial support for this work provided by an Infravation ERA-NET Plus Grant (31109806.0001: ECLIPS), National Science Foundation (CMMI:1130028, CAREER: 1253269) and California Energy Commission (Contract: PIR: 12-032). The authors acknowledge financial support provided by The Sustainable L.A. Grand Challenge and the 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 the datasets presented herein, and not necessarily the views of the funding organizations. The Laboratory for the Chemistry of Construction Materials (LC2) and the Molecular Instrumentation Center at UCLA acknowledge the support that has made their operations possible.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/8/30
Y1 - 2017/8/30
N2 - This study examined the benefits of adding microencapsulated phase change materials (PCMs) to concrete pavement sections so as to limit temperature rise and the development of temperature gradients due to exothermic cement hydration reactions and environmental exposure at early-ages. Isothermal calorimetry measurements of the heat generation rate associated with cement hydration as a function of time and temperature were carried out. A transient 1D thermal model of a pavement section was developed to simulate the temporal evolution of temperature within PCM-containing pavement sections exposed to realistic climate conditions. The results highlight that while the low thermal conductivity of typical organic PCMs may be undesirable, the PCM's latent heat capacity ensures substantial reductions in early-age temperature rise and the spatial temperature gradients developed within the pavement. In addition, a selection criterion is proposed to choose a PCM's phase change temperature based on its melting temperature window and the concrete temperature at the time of placement. It is noted that choosing a PCM with a phase change temperature equal to the concrete's placement temperature plus one-half of the melting temperature window provides the largest reduction in peak pavement temperature. The results provide original insights that are needed to design crack-resistant pavements containing PCMs.
AB - This study examined the benefits of adding microencapsulated phase change materials (PCMs) to concrete pavement sections so as to limit temperature rise and the development of temperature gradients due to exothermic cement hydration reactions and environmental exposure at early-ages. Isothermal calorimetry measurements of the heat generation rate associated with cement hydration as a function of time and temperature were carried out. A transient 1D thermal model of a pavement section was developed to simulate the temporal evolution of temperature within PCM-containing pavement sections exposed to realistic climate conditions. The results highlight that while the low thermal conductivity of typical organic PCMs may be undesirable, the PCM's latent heat capacity ensures substantial reductions in early-age temperature rise and the spatial temperature gradients developed within the pavement. In addition, a selection criterion is proposed to choose a PCM's phase change temperature based on its melting temperature window and the concrete temperature at the time of placement. It is noted that choosing a PCM with a phase change temperature equal to the concrete's placement temperature plus one-half of the melting temperature window provides the largest reduction in peak pavement temperature. The results provide original insights that are needed to design crack-resistant pavements containing PCMs.
KW - Cementitious composites
KW - Crack-resistant pavements
KW - Early-age concrete
KW - Phase change materials
KW - Thermal modeling
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U2 - 10.1016/j.conbuildmat.2017.04.150
DO - 10.1016/j.conbuildmat.2017.04.150
M3 - Article
AN - SCOPUS:85018956351
VL - 147
SP - 466
EP - 477
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -