Bottom Ash from Municipal Solid Waste from Incineration Plants as Mineral Additions for Concrete

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Title: Bottom Ash from Municipal Solid Waste from Incineration Plants as Mineral Additions for Concrete

Author(s): L. Bertolini, M. Carsana, D. Cassago, M. Collepardi, and A.Q. Curzio

Publication: Special Publication

Volume: 229

Issue:

Appears on pages(s): 467-476

Keywords: blended cement; MSWI bottom ashes; pozzolan; waste management

Date: 9/1/2005

Abstract:
The paper describes the results of research on the properties of concrete with the replacement of part of portland cement with bottom ash from municipal solid waste incinerators (MSWI). Results showed that MSWI bottom ash is potentially attractive as mineral addition for the production of concrete, provided that the risk of entrapment of hydrogen bubbles produced by corrosion of aluminium metallic particles in the fresh concrete is prevented. This could be achieved by wet grinding the bottom ash so that reactions leading to gas development could start within the slurry. A great variability was observed in the time required to exhaust the hydrogen gas production; a key factor for this variability was found in the pH of the slurry. A modest amount of cement added in slurry could increase the pH, reduce the time required to exhaust hydrogen evolution and allow manufacturing of quality concrete suitable for aggressive chloride bearing environments.