Effect of rice husk ash on carbon sequestration, mechanical property and microstructure evolution of cement-based materials with early-age carbonation treatment

Lingling Hu, Huamei Yang, Zhen He, Zhen Chen, Jun Hu, Shipeng Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Recycling of agricultural wastes to develop low-carbon supplementary cementitious materials requires the understanding of their effects on carbon sequestration, mechanical property and microstructure characteristics of cement-based materials. This work aims to disclose the mechanism of above-mentioned behavior in porous-structured rice husk ash (RHA) blended pastes using multi-technique investigations including mercury intrusion porosimetry (MIP), 29Si magic angle spinning nuclear magnetic resonance (29Si MAS NMR), Scanning electron microscope/Energy Dispersive Spectrometer (SEM/EDS) techniques coupled with carbonation-hydration model. It was discovered that pastes with increased dosages of RHA (5%–15%) presented an increase of CO2 uptake compared to that of control paste. It also showed an enhanced compressive strength after 12 h carbonation while simultaneously maintained a comparable strength development at 28 d. A declined permeability from water absorption experiment was also obtained especially in carbonated paste with 10% RHA. The enhanced polymerization degree of C–S–H and the decreased porosity due to the formation of calcite were the main contributors to the improved performances in RHA blended pastes.

Original languageEnglish
Article number104672
JournalCement and Concrete Composites
Volume133
DOIs
Publication statusPublished - Oct 2022
Externally publishedYes

Keywords

  • Carbon sequestration
  • Carbonation heat
  • Compressive strength
  • C–S–H
  • Porosity
  • Rice husk ash

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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