A calorimetric and microstructural study of solidified toxic wastes. Part 2: A model for poisoning of OPC hydration

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Waste Management; (United States)

DOI:https://doi.org/10.1016/0956-053X(94)90032-9· OSTI ID:6980763

Hills, C D; Sollars, C J; Perry, R ^[1]

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1. Imperial Coll. of Science, Technology and Medicine, London (United Kingdom). Centre for Environmental Control and Waste Management

During cement-based processing of certain hazardous wastes the hydration reactions thought to be responsible for solidification can be poisoned and appear to be retarded indefinitely. A number of wastes known to be capable of poisoning hydration were added to ordinary Portland cement (OPC) and classified on the basis of interference effects observed. This paper reports the results from a characterization of these wastes and the subsequent addition to OPC of waste components identified as significant in single and combined additions. The effects of these additions were examined by conduction calorimetry and microstructural techniques. A comparison of results showed that it was possible to reproduce the poisoning effects observed previously with real wastes by an addition of combined metal hydroxides only. These results suggest that poisoning results from the synergistic effects of compounds contained in the waste. A model, representing the early hydration of OPC, has been modified and is presented and its application in explaining poisoning of hydration is discussed.

• OSTI ID: 6980763
• Journal Information: Waste Management; (United States), Journal Name: Waste Management; (United States) Vol. 14:7; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
BUILDING MATERIALS
CALORIMETRY
CEMENTS
CHEMICAL COMPOSITION
HAZARDOUS MATERIALS
HYDRATION
INHIBITION
MANAGEMENT
MATERIALS
MATHEMATICAL MODELS
MICROSTRUCTURE
PHASE TRANSFORMATIONS
PORTLAND CEMENT
PROCESSING
REMEDIAL ACTION
SOLIDIFICATION
SOLVATION
TECHNOLOGY ASSESSMENT
TOXIC MATERIALS
WASTE MANAGEMENT
WASTE PROCESSING