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Proceedings Paper

The analysis of air voids in concrete specimen using X-ray computed tomography
Author(s): Yu-Min Su; Nabil Hossiney; Mang Tia
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Paper Abstract

Portland Cement Concrete (PCC) and concrete containing Reclaimed Asphalt Pavement (RAP) as aggregate were evaluated by the Superpave Indirect Tensile (IDT) strength test in conjunction of X-ray Computed Tomography (CT). Each concrete specimen for Superpave IDT strength test was subject to several procedures of preparation: concrete slicing, air drying, surface cleaning, gage points mounting, and LVDTs aligning. The concrete specimen was administrated a specified load level for ten seconds and then unloaded. A pre-sitting load of ten to fifteen pounds was constantly applied in order to hold still the concrete specimen. The load level was repeated with approximately 10% increment of peak stress (eg., 10%, 20%, 30%...etc.), until when the fracture of concrete occurred. The X-ray CT scans were performed: before the load was initially applied and after the load was released. It was to identify subtle changes in concrete before and after the repeated load levels were administrated. An image-processing technique was developed to assess the air voids distribution for each load level. The maximum variation of air voids measured near the central area of the specimen was within ±0.3%. The volume of air voids in the concrete was observed to increase significantly when the concrete specimen was loaded to fracture. The significance of this study is a better understanding of microstructural property in terms of air voids by using X-ray CT to assess the microdamage in concrete before fracture.

Paper Details

Date Published: 16 April 2013
PDF: 10 pages
Proc. SPIE 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013, 86940S (16 April 2013); doi: 10.1117/12.2012267
Show Author Affiliations
Yu-Min Su, Univ. of Florida (United States)
Nabil Hossiney, Univ. of Florida (United States)
Mang Tia, Univ. of Florida (United States)


Published in SPIE Proceedings Vol. 8694:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013
Tzu Yang Yu, Editor(s)

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