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Kim, Jae Hong
Research Group for Concrete Structures and Materials
Research Interests
  • Mechanics of Concrete, Rheology, Structural Analysis, Construction Performance

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Nonlinear Ultrasonic Method to Evaluate Residual Mechanical Properties of Thermally Damaged Concrete

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Title
Nonlinear Ultrasonic Method to Evaluate Residual Mechanical Properties of Thermally Damaged Concrete
Author
Yim, Hong JaePark, Sun-JongKim, Jae HongKwak, Hyo-Gyoung
Issue Date
201407
Publisher
AMER CONCRETE INST
Citation
ACI MATERIALS JOURNAL, v.111, no.4, pp.399 - 409
Abstract
An experimental study has been carired out to evaluate the residual mechanical properties of thermally damaged concrete using a nonlinear ultrasonic method. A nonlinearity parameter was measured by the impact-modulation technique, which sensitively reflects the degree of thermal damage in concrete. Key mechanical properties, compressive strength, elastic modulus, and peak strain were obtained from compressive stress-strain curves of cylindrical concrete samples. The correlations between the nonlinearity parameters and the mechanical properties were investigated for various conditions: high-temperature exposure time of 1, 2, and 3 hours and four different mixture proportions. The authors thereupon developed regression equations that can predict the residual mechanical properties from the measurement of a nonlinearity parameter, which indicates the degree of thermal damage.
URI
http://scholarworks.unist.ac.kr/handle/201301/6223
DOI
http://dx.doi.org/10.14359/51686596
ISSN
0889-325X
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