Behaviour of ordinary Portland cement during the stabilization solidification of synthetic heavy metal sludge: macroscopic and microscopic aspects

摘要

Chromium and/or zinc hydroxide sludges were mixed at variable proportions with OPC, in order to evaluate the macroscopic and microscopic effects caused y the waste on the cement hydration process. Initial setting time, heat production during hydration, leaching characteristics and microstructure of the samples were investigated using varied techniques. For zinc hydroxide sludge, hydration was stopped after a few minutes, because of the precipitation of a solid hydrated phase.