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Use of co-fired woody biomass and peat fly ash in cementitious mixes

pubblicazioni - Memoria

Use of co-fired woody biomass and peat fly ash in cementitious mixes

Fly ashes from co-fired woody biomass (virgin wood chips) and peat combustion were considered for their use as cement replacement in cementitious mixes.

The objective of this work was to investigate the effects of two additions (15 and 30 wt.% of binder) on the flow and rheological properties, setting, and compressive strength of such mixes. The effectiveness of a water-washing pre-treatment of fly ashes was also ascertained. The preliminary results obtained showed that the studied fuel ash may be used as a mineral addition in cementitious mixes. It produces a remarkable increase in the water demand but does not adversely affect cement setting and strength development in the case of superplasticized cement mixes. The washing pre- treatment of raw fly ash is able to reduce or eliminate its adverse effect on the flow and rheological property, but it does not significantly modify the mechanical strength development.

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