Effect of nanofibrillated cellulose on shrinkage of cement pastes

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Letícia Oliveira de Souza - , Pontifícia Universidade Católica do Rio de Janeiro (Author)
  • Lourdes Maria Silva de Souza - , Pontifícia Universidade Católica do Rio de Janeiro (Author)
  • Flávio de Andrade Silva - , Pontifícia Universidade Católica do Rio de Janeiro (Author)
  • Viktor Mechtcherine - , Chair of Construction Materials (Author)

Abstract

This study investigates the effect of nanofibrillated cellulose (NFC) on the total and autogenous shrinkage deformation of cement pastes. Three different water-to-cement ratios (w/c) were used, namely 0.30, 0.35, and 0.40, along with NFC inclusion percentages of 0.000%, 0.025%, and 0.050%. The effects of NFC were evaluated through total and autogenous shrinkage measurements. Total shrinkage evolution was measured using 24-h-old prisms while autogenous shrinkage deformation was monitored using sealed prisms and corrugated tubes; their results were then compared. The corrugated tube method provided early-age deformation measurements, while the sealed prism method allowed for direct comparison with free-drying shrinkage specimens. Flow table and bleed water tests were conducted to support the understanding of the impact of NFC on the cementitious system. The NFC reduced the expansion by up to 85%. Regarding total shrinkage deformation, there was a 36% decrease at the end of 28 days for specimens with a w/c of 0.30 and NFC inclusion of 0.050%. However, this outcome varied for different combinations of w/c and nanocellulose content. The presence of NFC modified the fresh state properties of cement pastes, significantly reducing bleed water and decreasing the expansion. These findings highlight the potential of NFC as a material for controlling shrinkage deformation depend on the dosage and emphasize the importance of considering different measurement methods for accurate assessment.

Details

Original languageEnglish
Article number53
Number of pages13
JournalMaterials and Structures/Materiaux et Constructions
Volume57 (2024)
Issue number4
Publication statusPublished - 2 Apr 2024
Peer-reviewedYes

Keywords

Keywords

  • Autogenous shrinkage, Bleed water, Cement paste, Corrugated tubes, Nanofibrillated cellulose