CT measurements of SAP voids in concrete

Sara Laustsen, Dale P. Bentz, Marianne Tange Hasholt, Ole Mejlhede Jensen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

X-ray computed tomography (CT) scanning is used to determine the SAP void distribution in hardened concrete. Three different approaches are used to analyse a binary data set created from CT measurement. One approach classifies a cluster of connected, empty voxels (volumetric pixel of a 3D image) as one void, whereas the other two approaches are able to classify a cluster of connected, empty voxels as a number of individual voids. Superabsorbent polymers (SAP) have been used to incorporate air into concrete. An advantage of using SAP is that it enables control of the amount and size of the created air voids. The results indicate the presence of void clusters. To identify the individual voids, special computational approaches are needed. The addition of SAP results in a dominant peak in two of the three air void distributions. Based on the position (void diameter) of the peak, it is possible to calculate the liquid absorption of the SAP within the fresh concrete. This estimated liquid absorption is in reasonable agreement with previous studies.
Original languageEnglish
Title of host publicationUse of Superabsorbent Polymers and Other New Additives in Concrete
Number of pages312
Place of PublicationBagneux, France
PublisherRilem publications
Publication date2010
Pages153-162
ISBN (Print)978-2-35158-104-9
Publication statusPublished - 2010
EventInternational RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete - Lyngby, Denmark
Duration: 15 Aug 201018 Aug 2010

Conference

ConferenceInternational RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete
CountryDenmark
CityLyngby
Period15/08/201018/08/2010
SeriesRILEM PRO
Number74

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