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Effect of particle size distribution on the bio-cementation of coarse aggregates

Acta Geotechnica volume 13, pages 1019–1025 (2018)Cite this article

Abstract

The effect of grain size distribution on the unconfined compressive strength (UCS) of bio-cemented granular columns is examined. Fine and coarse aggregates were mixed in various percentages to obtain five different grain size distributions. A four-phase percolation strategy was adopted where a bacterial suspension and a cementation solution (urea and calcium chloride) were percolated sequentially. The results show that a gap-graded particle size distribution can improve the UCS of bio-cemented coarser granular materials. A maximum UCS of approximately 575 kPa was achieved with a particle size distribution containing 75% coarse aggregate and 25% fine aggregate. Furthermore, the minimum UCS obtained has applications where mitigation of excessive bulging of stone/sand columns, and possible slumping that might occur during their installation, is needed. The finding also implies that the amount of biochemical treatments can be reduced by adding fine aggregate to coarse aggregate resulting in effective bio-cementation within the pore matrix of the coarse aggregate column as it could substantially reduce the cost associated with bio-cementation process. Scanning electron microscopy results confirm that adding fine aggregate to coarse aggregate provides more bridging contacts (connected by calcium carbonate precipitation) between coarse aggregate particles, and hence, the maximum UCS achieved was not necessarily associated with the maximum calcium carbonate precipitation.

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Acknowledgements

The authors acknowledge use of facilities within the Monash Centre for Electron Microscopy.

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Authors and Affiliations

  1. Department of Civil Engineering, Monash University, 18 Alliance Lane, Melbourne, VIC, 3800, Australia

    Aamir Mahawish

  2. Department of Civil Engineering, Monash University, 23 College Walk, Melbourne, VIC, 3800, Australia

    Abdelmalek Bouazza

  3. Australian Centre for Infrastructure Durability, Institute for Frontier Materials, Deakin University, Burwood, VIC, 3125, Australia

    Will P. Gates

Authors
  1. Aamir Mahawish
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  2. Abdelmalek Bouazza
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  3. Will P. Gates
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Correspondence to Abdelmalek Bouazza.

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Mahawish, A., Bouazza, A. & Gates, W.P. Effect of particle size distribution on the bio-cementation of coarse aggregates. Acta Geotech. 13, 1019–1025 (2018). https://doi.org/10.1007/s11440-017-0604-7

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  • DOI: https://doi.org/10.1007/s11440-017-0604-7

Keywords

  • Bio-cementation
  • Coarse aggregate
  • Fine aggregate
  • MICP
  • Strength