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Quartz Powder Valorisation in White Self-Compacting Concrete: Mortar Level Study
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Orientador(es)
Resumo(s)
Quartz powder (QP) from mining exploration has increased, and valorisation solutions are
sought. QP incorporation in structural concrete is an exciting strategy for the growth and sustainable
development of the concrete industry, waste management and environmental protection. This work
addresses the valorisation of QP from a Portuguese company on powder-type self-compacting
concrete for architectural and structural purposes, combining the light colour of quartz with white
cement. As such, QP was used as a partial cement replacement, acting as a filler on self-compacting
white mortars (SCWM) and pastes (SCWP). Firstly, the QP was characterised by chemical, physical
and morphological properties. Afterwards, SCWM with 10% of the white Portland cement with
QP were produced and, with 10% cement replacement by limestone fillers, commercially available,
for comparison purposes. The following engineering properties were evaluated, flowability and
viscosity, electrical resistivity, porosity and mechanical strength. In equivalent pastes samples, the
heat of hydration was accessed. Finally, an architectonic element prototype was produced using
SCWM-QP, and colour and aesthetics were evaluated. All SCWM reached adequate deformability
and viscosity for self-compaction. In the hardened state, compressive strength, electrical resistivity
and water-permeable porosity presented similar results for mortars incorporating quartz powder and
limestone fillers. The isothermal calorimetry in equivalent pastes revealed a slight desacceleration
of hydration for SCWP incorporating QP. The major findings of this study confirm the feasibility of
SCWM with QP, meeting the required performance while reducing resource depletion in the concrete
industry and adding value to a by-product.
Descrição
Palavras-chave
Quartz powder Waste valorisation White cement Architectonic concrete Self-compacting concrete . Faculdade de Ciências Exatas e da Engenharia
Contexto Educativo
Citação
Matos, A.M.; Maia, L.; Coutinho, J.S. Quartz Powder Valorisation in White Self-Compacting Concrete: Mortar Level Study. Appl. Sci. 2023, 13, 7652. https://doi.org/ 10.3390/app13137652
Editora
MDPI