Scholarly record
USAGE OF BOTTOM ASH FROM COAL COMBUSTION TO REPLACE NATURAL AGGREGATE IN MANUFACTURING OF BUILDING MATERIALS
Abstract
Ash resulted from coal burning in steam generator boilers of large power plants is an industrial waste which rises major problems for the environment, both in terms of large quantities currently generated and quantities accumulated over time in specific deposits. Concerning the fly ash in the flue gas and trapped in electrostatic precipitators the recovery is 100% possible as raw material for cement used in construction manufacturing. For bottom ash virtually no current use exists, the amount being insignificant compared to the fly ash. Consequently, this type of industrial waste continues to be accumulated in large deposits, which alter the natural landscape in the vicinity of the power plant. The possibility to replace partially the natural aggregate used in building materials with coal bottom ash was analyzed within the CHARPHITE project. The article presents in detail the procedures and points out the results as tables and charts. Bottom ash from thermal power plants was considered as an alternative source of lightweight granular aggregate (bulk density from 0.7 to 0.9 g/cm3) and successfully used to manufacture building elements of 1.0 - 1.2 g/cm3 density class. In addition, due to the thermal stability achieved by the very way it is manufactured (coal combustion residue discharged at temperatures above 1100В°C) and when used in combination with suitable hydraulic binders, bottom ash provides the possibility of obtaining heat resistant lightweight concrete of the same density class and characterized by the maximum operating temperature up to 1150В°C. In such applications, bottom ash can substitute natural lightweight granular aggregates, such as calcined diatomite.
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