Dissolution experiments on dolerite quarry fines at low liquid-to-solid ratio: a source of calcium for MICP

Carla C. Casas*, Carl J. Schaschke, Joseph C. Akunna, M. Ehsan Jorat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
4 Downloads (Pure)

Abstract

Microbially induced calcite precipitation (MICP) is an emerging soil stabilisation technique consisting of the precipitation of the mineral calcite in the soil matrix. The components required for MICP are currently industry end products. In this study, the calcium release and reusability of calcium-rich silicate quarry fines, dolerite, were investigated in closed (batch reactor) and open (permeability test) systems at liquid-to-solid (L/S) mass ratios ≤ 1·5 for MICP applications. The large specific surface area and reactive surface area accelerated calcium release, achieving calcium concentrations between 10 and 23 mM for different settings. Dissolution in the batch reactor resulted in increased silt (<0·006 mm) and clay fractions. X-ray fluorescence analysis indicated no significant depletion of calcium in the dolerite after dissolution. The study showed that dolerite quarry fines dissolution in distilled water at low L/S ratios is a rich source of calcium for MICP applications.

Original languageEnglish
Number of pages32
Journal Environmental Geotechnics
DOIs
Publication statusE-pub ahead of print - 25 Sep 2019

Keywords

  • calcium carbonate
  • geochemistry
  • geomaterial characterisation

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Water Science and Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal
  • Geochemistry and Petrology
  • Nature and Landscape Conservation
  • Management, Monitoring, Policy and Law

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