TY - JOUR
T1 - On the feasibility of using phase change materials (PCMs) to mitigate thermal cracking in cementitious materials
AU - Fernandes, Fabio
AU - Manari, Shilpa
AU - Aguayo, Mathew
AU - Santos, Kevin
AU - Oey, Tandre
AU - Wei, Zhenhua
AU - Falzone, Gabriel
AU - Neithalath, Narayanan
AU - Sant, Gaurav
N1 - Funding Information:
The authors acknowledge financial support for this research provisioned by the University of California , Los Angeles (UCLA), the National Science Foundation (CMMI: 1130028) and in part by BASF Corporation. The authors also acknowledge the generous provision of materials by U.S. Concrete and BASF Corporation (Dispersions and Pigments, North America). 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 do not reflect the views/policies of the funding agency, nor do the contents constitute a specification, standard or a regulation. This research was conducted in the Laboratory for the Chemistry of Construction Materials (LC 2 ) and the core-facility Molecular Instrumentation Center (MIC) at the University of California, Los Angeles and the Laboratory for the Science of Sustainable Infrastructural Materials (LS-SIM) at Arizona State University. As such, the authors gratefully acknowledge the support of these laboratories in making this research possible. The last author would also like to acknowledge discretionary support for this work provided by the Edward K. and Linda L. Endowed Chair in Materials Science.
PY - 2014/8
Y1 - 2014/8
N2 - Temperature changes driven by hydration reactions and environmental loading are a leading cause of thermal cracking in restrained concrete elements. This work describes preliminary investigations on the use of microencapsulated phase change materials (PCMs) as a means to mitigate such thermal cracking. Special attention is paid to quantify aspects of: heat absorption and release, the development of unrestrained/restrained thermal stresses and strains and the mechanical properties including: compressive strength, elastic modulus and fracture behavior. First, PCMs incorporated in cementitious systems absorb and release heat, which scales as a function of their dosage and enthalpy of phase change. Second, for restrained and unrestrained conditions and for equal temperature change, the thermal deformation and stresses developed are noted to be similar to a plain cement system independent of the PCM dosage. However, PCM additions are noted to reduce the rate of deformation and stress development so long as the phase transition is active. Third, while the presence of PCMs does depress the compressive strength and elastic modulus (in increasing proportion with dosage), the fracture toughness is impacted to a lesser degree. While of a preliminary nature, the studies highlight a novel means of exploiting phase transitions to control thermal stress evolutions in restrained elements.
AB - Temperature changes driven by hydration reactions and environmental loading are a leading cause of thermal cracking in restrained concrete elements. This work describes preliminary investigations on the use of microencapsulated phase change materials (PCMs) as a means to mitigate such thermal cracking. Special attention is paid to quantify aspects of: heat absorption and release, the development of unrestrained/restrained thermal stresses and strains and the mechanical properties including: compressive strength, elastic modulus and fracture behavior. First, PCMs incorporated in cementitious systems absorb and release heat, which scales as a function of their dosage and enthalpy of phase change. Second, for restrained and unrestrained conditions and for equal temperature change, the thermal deformation and stresses developed are noted to be similar to a plain cement system independent of the PCM dosage. However, PCM additions are noted to reduce the rate of deformation and stress development so long as the phase transition is active. Third, while the presence of PCMs does depress the compressive strength and elastic modulus (in increasing proportion with dosage), the fracture toughness is impacted to a lesser degree. While of a preliminary nature, the studies highlight a novel means of exploiting phase transitions to control thermal stress evolutions in restrained elements.
KW - Cracking
KW - Inclusions
KW - Phase change
KW - Shrinkage
KW - Temperature
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U2 - 10.1016/j.cemconcomp.2014.03.003
DO - 10.1016/j.cemconcomp.2014.03.003
M3 - Article
AN - SCOPUS:84899407628
SN - 0958-9465
VL - 51
SP - 14
EP - 26
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -