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Title	Fly ash from biomass combustion as replacement raw material and its influence on the mortars durability
ID_Doc	8172
Authors	Modolo, RCE; Senff, L; Ferreira, VM; Tarelho, LAC; Moraes, CAM
Title	Fly ash from biomass combustion as replacement raw material and its influence on the mortars durability
Year	2018
Published	Journal Of Material Cycles And Waste Management, 20.0, 2
Abstract	Several types of industrial solid waste have been used as byproducts in the construction and materials industries. Some of the applications seem to be required from the environmental point of view as a contribution to circular economy. Nevertheless, durability of materials should be assessed to avoid future problems. This work evaluated the fly ash from forest biomass combustion as a potential additive replacing calcite in Portland cement-based mortars. Cement-based mortar formulations were prepared and characterized in the fresh and hardened states. In particular, the durability of samples cured for 1 year was assessed based on sulfate attack. Mortars cured for 360 days were pre-weighted and then totally immersed in a solution containing a well-defined concentration of sulfate. Seven-day immersion + drying cycles were carried out, and weight was determined after each cycle. Liquid solutions containing sulfate were renewed every 14 days. One set sample was kept soaked in tap water to be used as reference. The results revealed that replacing 20% of calcite by fly ash seems to be a suitable alternative concerning mechanical strength. However, sulfate attack tests showed that strength rapidly deteriorates using fly ashes as a replacement raw material.
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