Abstract
The destructive expansion of circulating fluidised bed combustion (CFBC) ash is the bottleneck problem for its utilisation in building materials. The effect of mixing pulverised-coal combustion (PCC) fly ash or clinker as well as autoclave curing on the expansion of a sulfur-rich CFBC ash cementitious system was investigated. It was found that the linear expansion ratio of CFBC ash–PCC fly ash–clinker mortar with no more than 3·5% SO3 is close to that of cement mortar. Moreover, the linear expansion ratio of CFBC ash–clinker–water paste dropped to less than 0·5 mm/m after autoclave curing. This study suggests that the volume stability of a CFBC ash cementitious system can be controlled effectively through autoclave curing or limiting the content of total SO3 to below 3·5%.
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