Understanding the efficiency of autogenous and autonomous self-healing of conventional concrete mixtures through mechanical and microscopical analysis

Diego J. De Souza*, Leandro F.M. Sanchez

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Among the ways to counter the effects of concrete cracking, self-healing appears to be very promising. This research aims to appraise the effect of autogenous and autonomous self-healing on the condition recovery of mechanically loaded concrete specimens proportioned with distinct raw materials. A commercially available crystalline admixture (CA), different types of SCMs, and chemically modified versions of CA were combined with cement to proportion distinct mixtures. Ninety-six specimens from each mixture were manufactured and cured for 28 and 180 days at 20 °C and 100 % RH, after which they were pre-loaded using up to 90 % of their corresponding compressive strength and restored at the same curing conditions for 90 days. Non-destructive, microscopic, and mechanical test procedures were conducted on the samples after the secondary curing; results indicate that SCMs enhanced the natural healing. However, mixtures to which CA was added demonstrated the highest healing ratios, indicating promising recovery of mechanical properties.
Original languageEnglish
Article number107219
JournalCement and Concrete Research
Volume172
Number of pages23
ISSN0008-8846
DOIs
Publication statusPublished - 2023

Bibliographical note

The authors would like to thank Dr. Gamal Elnabelsya and Dr. Muslim Majeed, technical officers of the Materials and Structures Laboratory in the Department of Civil Engineering at the University of Ottawa. Likewise, the authors would like to express their sincere gratitude and appreciation to Kryton International, Mr. Alireza Biparva and Mary Grace Rosalin. As well as Dr. De Souza benefits from the University of Ottawa Excellence Scholarship, Collaborative Research & Development by NSERC (Natural Science and Engineering Research Council of Canada), and the prestigious Vanier CGS scholarship, also financed by the NSERC. Furthermore, this project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 899987.

Keywords

  • Crystalline admixtures
  • Self-healing
  • Supplementary cementing materials

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