A large experimental work has been developed on a pyroclastic soil from Southern Italy to show its suitability to lime stabilisation and the effectiveness of the treatment. Some of the results obtained by means of oedometer tests, including conventional loading paths as well as wetting paths, on both not treated and lime stabilised samples have been presented in the paper. The beneficial effects of the mechanical improvement induced after the addition of lime have been linked to the chemical–physical evolution of the system, with particular reference to the short term. Microstructural analyses (XRD, DTA, FTIR) performed on not treated and stabilised samples showed that ionic exchange is not expected for the pyroclastic soil and that the ongoing of pozzolanic reactions develop since the very short term in the system. The formation of calcium Silicate Hydrates (CSH) and Calcium Aluminate Hydrates (CAH) is responsible for the mechanical improvement of the stabilised soil, with particular reference to the structural collapse behaviour.
Microstructure insights in mechanical improvement of a lime-stabilised pyroclastic soil
CECCONI, Manuela;PANE, Vincenzo;CAMBI, Costanza;GUIDOBALDI, GIULIA
2016
Abstract
A large experimental work has been developed on a pyroclastic soil from Southern Italy to show its suitability to lime stabilisation and the effectiveness of the treatment. Some of the results obtained by means of oedometer tests, including conventional loading paths as well as wetting paths, on both not treated and lime stabilised samples have been presented in the paper. The beneficial effects of the mechanical improvement induced after the addition of lime have been linked to the chemical–physical evolution of the system, with particular reference to the short term. Microstructural analyses (XRD, DTA, FTIR) performed on not treated and stabilised samples showed that ionic exchange is not expected for the pyroclastic soil and that the ongoing of pozzolanic reactions develop since the very short term in the system. The formation of calcium Silicate Hydrates (CSH) and Calcium Aluminate Hydrates (CAH) is responsible for the mechanical improvement of the stabilised soil, with particular reference to the structural collapse behaviour.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
