Analysing entrapped pores in concrete via x-ray computed tomography : Influence of workability and compaction time

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2024-02-23

Department

Department of Civil Engineering

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Language

en

Pages

11

Series

Construction and Building Materials, Volume 417

Abstract

Understanding the attributes of entrapped pores in compacted concrete is crucial for improving mechanical and durability properties of concretes. This research investigates how compaction time and workability affect entrapped pores characteristics. Using X-ray Computed Tomography, concrete specimens, with different workability classes, were analysed after being compacted for different times. Results show that increased workability and vibration time significantly reduce entrapped porosity, especially in the 2.7–4.6 mm diameter range, but this effect lessens at extended durations. Higher workability results in less spherical pores, potentially leading to stress concentrations. Additionally, concentrations of entrapped pores up to 5% were observed along specimen heights. These insights contribute to our understanding of pore properties, indicating potential adverse impacts on the performance of concrete.

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Funding Information: This study was financially supported by the co-operation agreement with the Finnish Concrete Industry [project number 700721 ], and the x-ray tomography was supported by the Academy of Finland via RAMI infrastructure [project number 293109 ]. Publisher Copyright: © 2024 The Authors

Keywords

Concrete compaction, Concrete porosity, Concrete workability, Entrapped pores, X-ray computed tomography

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DOI

10.1016/j.conbuildmat.2024.135322

Citation

Ahmed, H, Kuva, J & Punkki, J 2024, 'Analysing entrapped pores in concrete via x-ray computed tomography : Influence of workability and compaction time', Construction and Building Materials, vol. 417, 135322. https://doi.org/10.1016/j.conbuildmat.2024.135322

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https://urn.fi/URN:NBN:fi:aalto-202403062499

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[article-cris] Insinööritieteiden korkeakoulu / ENG