Title:
Synergistic Effect of CDWs as Eco-Pozzolans: Ternary Cements
Author(s):
Vigil de la Villa, R., García-Giménez, R., Frías, M., Martínez Ramírez, S., Fernández-Carrasco, L., Lahoz, E., Moreno-Juez, J., Vegas-Ramiro, I.
Publication:
Symposium Paper
Volume:
355
Issue:
Appears on pages(s):
485-494
Keywords:
binary pozzolan mix; construction and demolition wastes; reaction kinetics; ternary blended cement
DOI:
10.14359/51736056
Date:
7/1/2022
Abstract:
Sustainable development and circular economy policies currently prioritize the recovery of industrial waste and rubble as secondary raw materials. Concrete and demolition waste's (CDW) fine fractions of concrete nature are bringing special attention due to their accumulation, subject to weather conditions, and without any industrial application at present. These wastes have little pozzolanic activity, which is why it is necessary to combine them with other active additions for the ternary cements manufacture. At present, a laminar glass waste from the deconstruction has been selected to obtain the binary mixture. A binary mixture of pozzolan recycled concrete/glass with a 1:2 ratio has been prepared to evaluate the synergy of both wastes in the pozzolanic reaction, and its possible commercialization for future ternary cements that are more sustainable. The characterization of materials and reaction kinetics mainly in the ternary pastes have been characterized by XRF, ICP/MS, NMR, FTIR, XRD-Rietveld, and SEM/EDX, detecting calcite, quartz, mica, feldspar, and clay minerals and as hydrated phases ettringite, aluminates and C-S-H gels. According to these results, it can be highlighted that from the scientific point of view, this mixture of pozzolans from CDWs is viable for use as ecoefficient pozzolans for the more sustainable ternary cements.
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