Centrifuge Study on Carbonation Effects in Calcareous Sand
Centrifuge Study on Carbonation Effects in Calcareous Sand
The long-term geochemical evolution of reclaimed calcareous sand deposits and its influence on soil behaviour remain insufficiently understood, particularly the effects of calcium carbonate (CaCO) dissolution. This study investigates the impact of carbonation on reclaimed calcareous sand by inducing controlled chemical alteration at 1 g and subsequently evaluating mechanical response using 40 g centrifuge zone load tests. Carbonation was achieved through sustained injection of carbon dioxide (CO) enriched pore water, resulting in a progressive reduction in pore-water pH. Continuous pH monitoring confirmed effective and depth-dependent carbonation within the soil profile. Comparisons with an identical non-carbonated deposit show a reduction in stress mobilisation after carbonation. The results show that carbonation-induced dissolution processes representative of reclaimed island can be effectively reproduced in the laboratory.
J. Singh; Walid Mekni; Mohamed Ghazy; Tarek Abdoun; Kosmas Pavlopoulos; W. El-Sekelly
11th International Conference on Physical Modelling in Geotechnics (ICPMG2026)
Session 3: Resilient geotechnical infrastructure
https://doi.org/10.53243/ICPMG2026-250