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CT measurement of SAP voids in concrete



Title: CT measurement of SAP voids in concrete
Author(s): S. Laustsen, D.P. Bentz, M.T. Hasholt, O.M. Jensen
Paper category : conference
Book title: International RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete
Editor(s): O.M. Jensen, M.T. Hasholt and S. Laustsen
Print-ISBN: 978-2-35158-104-9
e-ISBN: 978-2-35158-105-6
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 153 - 162
Total Pages: 10
Nb references: 8
Language: English


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 this 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.


Online publication: 2010-10-04
Publication type : full_text
Public price (Euros): 0.00


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