THE INFLUENCE OF DIFFERENT CURING ENVIRONMENTS ON THE BEHAVIOUR OF CEMENT-BASED GROUTS USED IN CONTAMINATED SOIL TREATMENT

摘要

This paper details results of a preliminary investigation into the influence of different curing environments for accelerating the ageing of four cement-based grouts used to treat contaminated soils. The grouts consisted of a combination of cement, ash, lime and bentonite. The behaviour of both uncontaminated and contaminated materials was considered. The contaminants used comprised of compounds of five heavy metals (Pb, Cu, Cd, Ni and Zn) and paraffin oil. Samples were cured adopting exposure to elevated temperature and carbon dioxide (accelerated carbonation). Tests were conducted for strength, carbonated depth, leachate pH and x-ray diffraction after 28, 90 and 180 days of curing. The results suggested that the four grouts behaved differently under these different curing conditions, with the exposure to elevated temperature being the more consistent of the two environments.