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

Hassan Ahmed*, Jukka Kuva, Jouni Punkki

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
33 Downloads (Pure)

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.

Original languageEnglish
Article number135322
Number of pages11
JournalConstruction and Building Materials
Volume417
DOIs
Publication statusPublished - 23 Feb 2024
MoE publication typeA1 Journal article-refereed

Keywords

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

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