TY - JOUR
T1 - The influence of microencapsulated phase change material (PCM) characteristics on the microstructure and strength of cementitious composites
T2 - Experiments and finite element simulations
AU - Aguayo, Matthew
AU - Das, Sumanta
AU - Maroli, Amit
AU - Kabay, Nihat
AU - Mertens, James C E
AU - Rajan, Subramaniam
AU - Sant, Gaurav
AU - Chawla, Nikhilesh
AU - Neithalath, Narayanan
N1 - Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/10/1
Y1 - 2016/10/1
N2 - Phase Change Materials (PCMs) incorporated into cementitious systems have been well-studied with respect to energy efficiency of building envelopes. New applications of PCMs in infrastructural concrete, e.g., for mitigating early-age cracking and freeze-and-thaw induced damage, have been proposed. Hence this paper develops a detailed understanding of the characteristics of cementitious systems containing two different microencapsulated PCMs. The PCMs are evaluated using thermal analysis, vibrational (FTIR) spectroscopy, and electron microscopy, and their dispersion in cement pastes is quantified using X-ray Computed Microtomography (μCT). The influences of PCMs on cement hydration and pore structure are evaluated. The compressive strength of mortars containing PCMs is noted to be strongly dependent on the encapsulation properties. Finite element simulations carried out on cementitious microstructures are used to assess the influence of interface properties and inter-inclusion interactions. The outcomes provide insights on methods to tailor the component phase properties and PCM volume fraction so as to achieve desirable performance.
AB - Phase Change Materials (PCMs) incorporated into cementitious systems have been well-studied with respect to energy efficiency of building envelopes. New applications of PCMs in infrastructural concrete, e.g., for mitigating early-age cracking and freeze-and-thaw induced damage, have been proposed. Hence this paper develops a detailed understanding of the characteristics of cementitious systems containing two different microencapsulated PCMs. The PCMs are evaluated using thermal analysis, vibrational (FTIR) spectroscopy, and electron microscopy, and their dispersion in cement pastes is quantified using X-ray Computed Microtomography (μCT). The influences of PCMs on cement hydration and pore structure are evaluated. The compressive strength of mortars containing PCMs is noted to be strongly dependent on the encapsulation properties. Finite element simulations carried out on cementitious microstructures are used to assess the influence of interface properties and inter-inclusion interactions. The outcomes provide insights on methods to tailor the component phase properties and PCM volume fraction so as to achieve desirable performance.
KW - Compressive strength
KW - Dispersion
KW - Finite element analysis
KW - Microstructure
KW - Phase change materials (PCMs)
KW - Pore structure
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U2 - 10.1016/j.cemconcomp.2016.06.018
DO - 10.1016/j.cemconcomp.2016.06.018
M3 - Article
AN - SCOPUS:84978521848
SN - 0958-9465
VL - 73
SP - 29
EP - 41
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -