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Effect of crystalline admixtures on shrinkage and alkali-silica reaction of biochar-cementitious composites
- Source :
- Developments in the Built Environment; April 2024, Vol. 18 Issue: 1
- Publication Year :
- 2024
-
Abstract
- This study investigated effects of crystalline admixture (CA) on shrinkage and alkali-silica reaction behaviours of biochar-cementitious composites. Addition of 1–1.5 wt% superabsorbent polymer (SAP) completely mitigated autogenous shrinkage while slightly increasing the 120-day total shrinkage of the SP-cement composite by 5.7%, resulting in the highest apparent porosity. 1–1.5 wt% CA addition did not affect autogenous shrinkage while slightly reducing the 120-day total shrinkage by 10.1%. The combination of CA and waste wood biochar (WWB) reduced autogenous shrinkage by 24.23% and 120-day total shrinkage by 23.6%, resulting in the lowest apparent porosity. The formation of hydration products in the WWB pores and on WWB surface densified the cementitious matrix, leading to a reduction in water evaporation. Furthermore, for specimens exposed to 1 M NaOH solution at 80 °C, CA addition significantly reduced the 120-day expansion by 50.6%, while the combination of CA and WWB addition reduced the 120-day expansion by 42.9%.
Details
- Language :
- English
- ISSN :
- 26661659
- Volume :
- 18
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Developments in the Built Environment
- Publication Type :
- Periodical
- Accession number :
- ejs66354067
- Full Text :
- https://doi.org/10.1016/j.dibe.2024.100456