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Proceedings Paper

The evaluation of ordinary Portland cement concrete subject to elevated temperatures in conjunction with acoustic emission and splitting tensile test
Author(s): Yu-Min Su; Tsung-Chin Hou; Guan-Ying Chen; Ping-Ni Hou
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Paper Abstract

The research objective was to evaluate Ordinary Portland Cement concrete subject to various elevated temperatures. Single OPC concrete mixture with water to cementitious (w/c) equal to 0.45 was proportioned. Concrete specimens were cast and placed in the curing tank in which water was saturated with calcium hydroxide. After ninety days of moist-cure, three elevated temperatures, namely 300, 600, and 900-°C, were carried out upon hardened concrete specimens. Furthermore, two post-damaged curing conditions were executed to recover damaged concrete specimens: one was to recure under 23°C with 50% humidity in a controlled environmental chamber and the other was to recure in the same curing tank. Acoustic emission apparatus coupled with the splitting tensile test was utilized and found able to assess damaged concrete. Before concrete subject to elevated temperatures, the development of indirect tensile strength versus displacement diagram fit well with the tendency of AE energy release. It was found there was a large amount of AE energy released when stress and displacement diagram developed about 40-50%. As such could be identified as the onset of first fracture and the plain concrete generally exhibited a quasi-brittle fracture with two major series of AE energy dissipations; however when concrete specimens were subject to elevated temperatures, the damaged concrete specimens displayed neither fracture pattern nor the “double-hump” AE energy dissipation in comparison with those of plain concrete.

Paper Details

Date Published: 19 April 2017
PDF: 9 pages
Proc. SPIE 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017, 1016921 (19 April 2017); doi: 10.1117/12.2259786
Show Author Affiliations
Yu-Min Su, National Kaohsiung Univ. of Applied Sciences (Taiwan)
Tsung-Chin Hou, National Cheng Kung Univ. (Taiwan)
Guan-Ying Chen, National Kaohsiung Univ. of Applied Sciences (Taiwan)
Ping-Ni Hou, National Kaohsiung Univ. of Applied Sciences (Taiwan)


Published in SPIE Proceedings Vol. 10169:
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017
H. Felix Wu; Andrew L. Gyekenyesi; Peter J. Shull; Tzu-Yang Yu, Editor(s)

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