TIME EFFECTS OF 3 CONTAMINANTS ON THE DURABILITY AND PERMEABILITY OF A SOLIDIFIED SAND

The work presented in this paper examines the effect of three differen t contaminants in low and high concentrations on the durability (wet-d ry and freeze-thaw) and permeability of stabilised/solidified contamin ated sand. The effect was investigated in terms of the development of the two properties with time under the influence of the contaminants a fter two different curing periods and hence giving some insight into t he development of the behaviour with time. The results show that in so me cases the behaviour is dependent not only on the type of the contam inant but also on its concentration. In general, both the durability a nd permeability results showed improvement with time as the curing per iod increased from 28 to 56 days attributed to the continual hydration of cement. This means that the design of stabilised/solidified soil b ased on 28 day durability and permeability properties would lead to an uneconomical design unless the effect of continual hydration of the c ement products, and hence continual development of the two properties, is allowed for in some way. This emphasises the need for the developm ent of appropriate tests which model in situ long term behaviour of st abilised/solidified ground.