The influence of microencapsulated phase change material (PCM) characteristics on the microstructure and strength of cementitious composites: Experiments and finite element simulations

被引：137

作者：

Aguayo, Matthew ^{[1
]}

Das, Sumanta ^{[1
]}

Maroli, Amit ^{[1
]}

Kabay, Nihat ^{[1
]}

Mertens, James C. E. ^{[2
]}

Rajan, Subramaniam D. ^{[1
]}

Sant, Gaurav ^{[3
,4
]}

Chawla, Nikhilesh ^{[2
]}

Neithalath, Narayanan ^{[1
]}

机构：

[1] Arizona State Univ, Sch Sustainable Engn & Built Environm, Tempe, AZ USA

[2] Arizona State Univ, Mat Sci & Engn, Tempe, AZ USA

[3] Univ Calif Los Angeles, Dept Civil & Environm Engn, Los Angeles, CA USA

[4] Calif Nanosyst Inst, Los Angeles, CA USA

来源：

CEMENT & CONCRETE COMPOSITES | 2016年 / 73卷

基金：

美国国家科学基金会;

关键词：

Phase change materials (PCMs); Microstructure; Dispersion; Pore structure; Compressive strength; Finite element analysis; THERMAL-ENERGY STORAGE; INTERFACIAL TRANSITION ZONE; COMPUTED-TOMOGRAPHY SYSTEM; N-OCTADECANE; LIGHTWEIGHT AGGREGATE; MECHANICAL-PROPERTIES; BUILDING WALLS; PORE STRUCTURE; LAB-SCALE; CONCRETE;

D O I：

10.1016/j.cemconcomp.2016.06.018

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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 (mu CT). 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. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：29 / 41

页数：13

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