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DOE OSTI · 2530841

Carbon sequestration into lime-stabilized soils: Engineering and mineralogical characterization

Moore, Jaxom [Oregon State Univ., Corvallis, OR (United States)]·Akula, Pavan [Oregon State Univ., Corvallis, OR (United States)] (ORCID:0000000248169943)·Ray, Saswati [Oregon State Univ., Corvallis, OR (United States)] (ORCID:000000023770551X)·Bastola, Ashish [Oregon State Univ., Corvallis, OR (United States)] (ORCID:0000000234314724)·Noell, Philip James [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)]·Rimsza, Jessica [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)]
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Abstract

Stabilizing weak clayey soils with lime is an effective method for improving the mechanical properties of soil. However, lime production is an energy-intensive process producing significant CO 2 emissions in lime-stabilized soils, which can be counteracted through accelerated carbonation that enhances its engineering performance. The present study evaluates accelerated carbonation of lime-treated soils by adding gaseous (CO 2 -rich gas), liquid (water-CO 2 mixture), and solid (sodium bicarbonate) CO 2 sources. Results indicated that samples carbonated with gaseous CO 2 exhibited 100% lime carbonation, while samples treated with solid and aqueous sources of CO 2 had a mean lime carbonation of 60% and 40%, respectively. Further, all lime-treated-carbonated samples exhibited a mean 50% increase in unconfined compressive strength compared to the untreated samples after a 7-day curing period. Durability evaluation through cyclic wetting and drying indicated that the carbonated samples had higher durability than the untreated samples. X-ray computed tomography showed that adding solid and liquid sources of CO 2 facilitated the flocculation of montmorillonite, reducing the porosity. However, a higher dosage of solid CO 2 induced clay dispersion, increasing the porosity. X-ray diffraction and thermogravimetric analysis verified CO 2 sequestration through the formation of calcite, a thermodynamically stable polymorph of calcium carbonate.

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58 GEOSCIENCESCarbon sequestrationCarbonationDurabilityLime treated soilsSoil stabilization

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Moore, Jaxom [Oregon State Univ., Corvallis, OR (United States)], Akula, Pavan [Oregon State Univ., Corvallis, OR (United States)] (ORCID:0000000248169943), Ray, Saswati [Oregon State Univ., Corvallis, OR (United States)] (ORCID:000000023770551X), Bastola, Ashish [Oregon State Univ., Corvallis, OR (United States)] (ORCID:0000000234314724), Noell, Philip James [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)], Rimsza, Jessica [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)]. 2024-12-30. Carbon sequestration into lime-stabilized soils: Engineering and mineralogical characterization. https://doi.org/10.1016/j.jclepro.2024.144613

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