Publication

On the Application of Microbially Induced Calcite Precipitation for Soils: A Multiscale Study

Lyesse Laloui
2017
Book Chapters

Abstract

Two laboratory experiments are used to provide preliminary evidence towards upscaling the microbially induced calcite precipitation (MICP) for soils. Fine sand is packed and subsequently subjected to MICP treatment in 11-liter cylindrical tanks. Different conditions are tested regarding the bacteria injection source as well as their propagation in the porous medium. The goal is to associate the adopted application strategy with the final shape, size and total mass of precipitated calcite in the yielded bio-cemented soil volume. Observations carried out at the micro-scale reveal the presence of calcified biofilms as a distinct “habit” of CaCO3 precipitate. Finally, a series of drained triaxial shear tests is carried out on fine and medium MICP-treated sands. Results reveal a more pronounced enhancement in terms of strength for the medium sand, despite the same CaCO3 content.

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https://infoscience.epfl.ch/entities/publication/32db5718-4d85-414a-9b84-eab698cbbd51

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Lyesse Laloui
2017
Book Chapters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/32db5718-4d85-414a-9b84-eab698cbbd51

About this result

Related concepts (32)

Calcite sea

A calcite sea is a sea in which low-magnesium calcite is the primary inorganic marine calcium carbonate precipitate. An aragonite sea is the alternate seawater chemistry in which aragonite and high-magnesium calcite are the primary inorganic carbonate precipitates. The Early Paleozoic and the Middle to Late Mesozoic oceans were predominantly calcite seas, whereas the Middle Paleozoic through the Early Mesozoic and the Cenozoic (including today) are characterized by aragonite seas.

Calcium carbonate

Calcium carbonate is a chemical compound with the chemical formula . It is a common substance found in rocks as the minerals calcite and aragonite, most notably in chalk and limestone, eggshells, gastropod shells, shellfish skeletons and pearls. Materials containing much calcium carbonate or resembling it are described as calcareous. Calcium carbonate is the active ingredient in agricultural lime and is created when calcium ions in hard water react with carbonate ions to create limescale.

Sand

Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass. The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz.

Related publications (2)

On the Application of Microbially Induced Calcite Precipitation for Soils: A Multiscale Study

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