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    Determination of the effect of volcanic pumice replacement on macro void development for blended cement mortars by computerized tomography
    (2012) Tekin I.; Birgul R.; Aruntas H.Y.
    In this study, the effect of volcanic pumice replacements with different ratios on the macro void development was observed using CT for a period of 100 days. The cured mortar specimens were imaged by X-ray CT on different days of the experiment. Utilizing Hounsfield Unit values as guides, void volumes and ratios were identified and measured by Matlab software. SEM images supported the X-ray CT results. It is shown that X-ray CT analysis is capable of assessing the development of macro voids in the mortar specimens. © 2012 Elsevier Ltd. All rights reserved.
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    Monitoring macro voids in mortars by computerized tomography method
    (Elsevier B.V., 2015) Tekin I.; Birgul R.; Ozgur Yaman I.; Gencel O.; Yilmaz Aruntas H.
    This study aims to investigate the use of ground pumice powder (PP) in cement production and to monitor void developments in mortars by X-ray Computerized Tomography (CT) which is a nondestructive test method. PP-blended cements were produced by replacing ordinary Portland cement with PP at 0% (control), 5%, 10% and 15% by weight. Paste and mortar specimens were manufactured by these blended cements. Some of the physical and mechanical tests are carried out on these mortar specimens. Experimental results showed that macro void developments in 100-day period for mortars with different PP replacement ratios exhibited different reduction in void ratios. © 2014 Elsevier Ltd. All rights reserved.
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    X-ray CT monitoring of macro void development in mortars exposed to sulfate attack
    (Techno Press, 2018) Tekin I.; Birgul R.; Aruntas H.Y.
    This study reports the results of nondestructive monitoring of macro void developments in mortars manufactured with both ordinary Portland cement and sulfate resistant cement. Two types of curing were utilized; tap water curing and another curing environment that contains 5% Na2(SO4) solution. Being the primary objective of this study, macro void developments of the mortar specimens were monitored by X-ray Medical Computerized Tomography. Compressive strength tests and water absorption tests were conducted on specimens that were kept in both curing environments for a duration of 560 days. Data analyses yielded consistent results among the three tests used in this experimental study. Macro void ratios of mortars decreased at the beginning of experiments for a certain period; afterwards, macro void ratios increased. The objective of this study was accomplished as anticipated since X-CT image analysis was able to nondestructively monitor macro void development process in cement mortars. Copyright © 2018 Techno-Press, Ltd.