The analysis of air voids in concrete specimen using X-ray computed tomography

Yu-Min Su; Nabil Hossiney; Mang Tia

doi:10.1117/12.2012267

16 April 2013 The analysis of air voids in concrete specimen using X-ray computed tomography

Yu-Min Su, Nabil Hossiney, Mang Tia

Proceedings Volume 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013; 86940S (2013) https://doi.org/10.1117/12.2012267
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2013, San Diego, California, United States

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.

Citation Download Citation

Yu-Min Su, Nabil Hossiney, and Mang Tia "The analysis of air voids in concrete specimen using X-ray computed tomography", Proc. SPIE 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013, 86940S (16 April 2013); https://doi.org/10.1117/12.2012267

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available