Time Effects of Three Contaminants on the Durability and Permeability of a Solidified Sand

Abstract

The work presented in this paper examines the effect of three different contaminants in low and high concentrations on the durability (wet-dry and freeze-thaw) and permeability of stabilised/solidified contaminated sand. The effect was investigated in terms of the development of the two properties with time under the influence of the contaminants after two different curing periods and hence giving some insight into the development of the behaviour with time. The results show that in some cases the behaviour is dependent not only on the type of the contaminant but also on its concentration. In general, both the durability and permeability results showed improvement with time as the curing period increased from 28 to 56 days attributed to the continual hydration of cement. This means that the design of stabilised/solidified soil based on 28 day durability and permeability properties would lead to an uneconomical design unless the effect of continual hydration of the cement products, and hence continual development of the two properties, is allowed for in some way. This emphasises the need for the development of appropriate tests which model in situ long term behaviour of stabilised/solidified ground.

Keywords:

• Contaminated soil
• solidification
• stabilisation
• permeability
• durability