Toggle Main Menu Toggle Search

Open Access padlockePrints

Experimental observations and theoretical interpretation of the mechanical behaviour of a grouted pyroclastic silty sand

Lookup NU author(s): Dr Gaetano EliaORCiD



This paper deals with the mechanical characterisation of an artificially structured material, obtained by grouting a low permeability pyroclastic silty sand (pozzolana) with a sodium silicate solution. Notwithstanding the low permeability of pozzolana (ksat = 10-6 / 10-7 m/sec), a preliminary set of laboratory tests has shown that the very diluted silicate grouts adopted are effective in enhancing its mechanical behaviour. The paper refers on a detailed experimental programme carried out to investigate the stress-strain behaviour of the grouted soil in order to outline its peculiar mechanical properties. With this aim, oedometer, CID and CIU triaxial tests were carried out. The whole set of results shows the typical behaviour of a structured material, with a brittle behaviour at low stress levels, and structural degradation at higher stresses. A first attempt to explain the experimental observations is proposed in the light of the classical Critical State Soil Mechanics theory and some preliminary conclusions are discussed.

Publication metadata

Author(s): Flora A, Lirer S, Amorosi A, Elia G

Editor(s): Schweiger HF

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: VI European Conference on Numerical Methods in Geotechnical Engineering

Year of Conference: 2006

Date deposited: 13/11/2009

Publisher: Taylor & Francis


Library holdings: Search Newcastle University Library for this item

ISBN: 0415408229