Abstract

The hydration behaviour of ordinary Portland cement (OPC) and other hydraulic binder systems in the presence of industrial wastes considered “suitable” for cement-based solidification is not always consistent. Waste-binder interference effects can significantly alter the short and long term mechanical, microstructural and binding characteristics of solidified waste forms containing materials from a wide variety of waste streams. In general, the mechanisms of interference can be explained and this lends support to the need for a critical evaluation of current waste form quality control procedures and the development of additional pre-treatment/alternative treatment methods. Future research studies including the in-situ examination of waste forms together with an in-depth quantitative analysis of the effects of waste species on the short- and long-term properties of solidified products is warranted.

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