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Investigation on thermal and mechanical characteristics of concrete mixed with shape stabilized phase change material for mix design

Title
Investigation on thermal and mechanical characteristics of concrete mixed with shape stabilized phase change material for mix design
Authors
Min H.-W.Kim S.Kim H.S.
Ewha Authors
김희선
SCOPUS Author ID
김희선scopus
Issue Date
2017
Journal Title
Construction and Building Materials
ISSN
0950-0618JCR Link
Citation
vol. 149, pp. 749 - 762
Keywords
Exfoliated graphite nanoplateletsMechanical propertiesMix designOctadecaneShape stabilized PCMThermal properties
Publisher
Elsevier Ltd
Indexed
SCIE; SCOPUS WOS scopus
Abstract
This paper aims at evaluating thermal and mechanical behaviors of concrete mixed with shape stabilized phase change material (SSPCM) in order to apply the concrete mixed with SSPCM for structural members. Toward that goal, material tests are performed on cylindrically shaped specimens having different water to cement ratios, SSPCM content, and temperature conditions. In addition, two different mixture methods are tested; the first is to add SSPCM to the concrete mixture, and the second is to replace the fine aggregate with the same amount of SSPCM. From the tests for thermal behaviors, it is observed that the thermal conductivity decreases and specific heat increases as SSPCM content increases. Regarding mechanical behaviors, the compressive strength and elastic modulus of concrete mixed with SSPCM decrease with SSPCM content, and the reduction rate is linearly proportional to the mass fraction of SSPCM to concrete. When the specimens are exposed to temperature higher than the melting point of the SSPCM, the compressive strength of the concrete is decreased. However, full recovery of the decreased strength is also observed when the heated specimens are cooled down to room temperature. Based on the experimental findings, an equation for calculating strength of concrete mixture is proposed and used to design mix proportions of concrete mixed with SSPCM. The material tests show that the specimens fabricated according to the proposed method satisfy the target strength. © 2017 Elsevier Ltd
DOI
10.1016/j.conbuildmat.2017.05.176
Appears in Collections:
엘텍공과대학 > 건축공학전공 > Journal papers
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