Abstract
The objective of this study is to valorise sands from biomass combustion from fluidised bed boilers into mortar formulations and to evaluate their effects on hydration properties, porosities and mechanical strengths. The properties of recycled sand from biomass combustion (RSBC) were compared to the boiler sand (BS) used in the combustion process in order to assess the effects of combustion. RSBC was then incorporated into mortar formulations as a volume replacement for the boiler sand (BS) from the biomass plant. Five formulations (0, 25, 50, 75 and 100% RSBC) were compared by examining their workability and strength properties (ranging from 7 to 180 days). Although a decrease in workability was observed, the substitution of sand with RSBC resulted in better mechanical properties. The accessible porosity, capillary absorption and hydration properties of three formulations (0, 50 and 100% RSBC) were also analysed. An improvement in these properties is observed when RSBC is incorporated with promising results for the valorisation of 100% RSBC.
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