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Materials 2016, 9(4), 291; doi:10.3390/ma9040291

Development of a Tomography Technique for Assessment of the Material Condition of Concrete Using Optimized Elastic Wave Parameters

1
Department of Civil Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
2
Discipline of Civil Engineering, School of Engineering, Monash University Malaysia, Selangor 46150, Malaysia
3
Department of Civil Engineering, Nihon University, Tokyo 101-8308, Japan
4
Department of Civil and Earth Resources Engineering, Kyoto University, Kyoto 615-8530, Japan
*
Authors to whom correspondence should be addressed.
Academic Editor: Hong Wong
Received: 7 December 2015 / Revised: 6 April 2016 / Accepted: 7 April 2016 / Published: 16 April 2016
(This article belongs to the Special Issue Image Analysis and Processing for Cement-based Materials)

Abstract

Concrete is the most ubiquitous construction material. Apart from the fresh and early age properties of concrete material, its condition during the structure life span affects the overall structural performance. Therefore, development of techniques such as non-destructive testing which enable the investigation of the material condition, are in great demand. Tomography technique has become an increasingly popular non-destructive evaluation technique for civil engineers to assess the condition of concrete structures. In the present study, this technique is investigated by developing reconstruction procedures utilizing different parameters of elastic waves, namely the travel time, wave amplitude, wave frequency, and Q-value. In the development of algorithms, a ray tracing feature was adopted to take into account the actual non-linear propagation of elastic waves in concrete containing defects. Numerical simulation accompanied by experimental verifications of wave motion were conducted to obtain wave propagation profiles in concrete containing honeycomb as a defect and in assessing the tendon duct filling of pre-stressed concrete (PC) elements. The detection of defects by the developed tomography reconstruction procedures was evaluated and discussed. View Full-Text
Keywords: tomography; honeycomb; pre-stressed concrete (PC); imaging algorithm; ray tracing; wave propagation tomography; honeycomb; pre-stressed concrete (PC); imaging algorithm; ray tracing; wave propagation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chai, H.K.; Liu, K.F.; Behnia, A.; Yoshikazu, K.; Shiotani, T. Development of a Tomography Technique for Assessment of the Material Condition of Concrete Using Optimized Elastic Wave Parameters. Materials 2016, 9, 291.

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