Details of Grant 

EPSRC Reference:	GR/J52419/01
Title:	ALTERNATIVE CEMENTITIOUS SYSTEMS FOR SOLIDIFICATION OF HAZARDOUS WASTES CONTAINING HEAVY METALS
Principal Investigator:	Perry, Professor R
Other Investigators:	Cheeseman, Professor C
Researcher Co-Investigators:
Project Partners:
Department:	Civil & Environmental Engineering
Organisation:	Imperial College London
Scheme:	Standard Research (Pre-FEC)
Starts:	01 February 1994	Ends:	31 July 1996	Value (£):	126,863
EPSRC Research Topic Classifications:	Waste Management
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:
Summary on Grant Application Form
Many inorganic hazardous wastes previously thought compatible with OPC-based solidification systems are capable of interrupting hydration reactions. In some cases hydration is completely poisoned. Preliminary studies at Imperial College have indicated that interactions of wastes with binders appear to be waste specific. Observations of the hydration of silicate cement phases suggested that selective interference mechanisms were at work in metal-containing waste sludges and were clearly different from those arising from organic materials, for which pre-solidification adsorbents are sometimes useful. This project will pursue an alternative strategy for limiting the effect of metal containing wastes on cement-based solidication systems by firstly investigating in detail the hydration of cementitious binders (eg OPC and PFA) in the presence of metal bearing wastes to identify the factors involved in hydration inhibition. This will enable identification of those critical parameters that affect individual cement phases and facilitate the construction of a database of performance criteria relating to the presence of a range of metals found in waste materials. This work will then be complimented by the development of specialised cements for solidification which will be performance tested with 'real' and synthetic wastes using microstructural, calorimetric and leach testing regimes.
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Organisation Website:	http://www.imperial.ac.uk