In the present note, experimental results of geotechnical tests on soil-fly ash mixtures are presented, focusing on hydraulic conductivity and compressibility of the stabilized soils. Two excavated natural soils with different characteristics were treated with 4% of a high pozzolanic fly ash. Samples were obtained by wet mixing of soil and binder and subsequent Standard Proctor compaction. Permeability tests and one-dimensional compression tests were carried out. Results are presented and in comparison with those of the same soils treated with lime or with a Portland Cement. SEM observations and Energy Dispersive X-Ray Spectroscopy were performed both on the additive and on the treated soils. Fly ash treatment was found capable to increase the soil hydraulic conductivity and to appreciably reduce the compressibility. Anyway, the fly ash stabilization resulted less effective if compared with that by traditional binders. Microstructure investigation on fly ash treated samples shows the not uniform presence of reaction products suggesting that environmental conditions should be further optimized for a higher reactions development.
Hydraulic conductivity and compressibility of soils treated with fly ash / Di Sante, M.; Bellezza, I.; Bernardo, D.; Fratalocchi, E.; Mazzieri, F.; Pasqualini, F.. - STAMPA. - (2023), pp. 800-807. (Intervento presentato al convegno VIII Convegno Nazionale dei Ricercatori di Ingegneria Geotecnica tenutosi a Palermo nel 5-7 Luglio 2023) [10.1007/978-3-031-34761-0_96].