Browsing by Keyword "Ternary blended cement"
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Item Quantitative correlations among textural characteristics of C-S-H gel and mechanical properties: Case of ternary Portland cements containing activated paper sludge and fly ash(2012-09) Goñi, S.; Frias, M.; Vegas, I.; García, R.; De La Villa, R. Vigil; GENERALThe hydraulic activity of ternary Portland cements containing different proportions of commercial thermally activated paper sludge (APS(I)) and fly ash (FA) from coal combustion was evaluated from the textural characterization of the C-S-H gels formed during hydration. The study was accomplished by means of the specific surface area (SSA) and pore-size distribution (PSD), which were measured by the sorption isotherms of nitrogen gas and the BET method. The microstructure was characterized by scanning electron microscopy (SEM). The incorporation of such admixtures (APS and FA) clearly revealed an increase in both porosity and SSA. This effect decreased with the progress of hydration, together with a refinement of the nano-porous structure of C-S-H. In addition, high correlations were found between nano-structural characteristics of the C-S-H gel and mechanical compressive strengths.Item Synergistic Effect of CDWs as Eco-Pozzolans: Ternary Cements(American Concrete Institute, 2022-07-01) Vigil de la Villa, Raquel; García-Giménez, Rosario; Frías, Moisés; Martínez Ramírez, Sagrario; Fernández-Carrasco, Lucía; Lahoz Ruiz, Eduardo; Moreno-Juez, Jaime; Vegas-Ramiro, Iñigo; Coffetti, Denny; Coppola, Luigi; Holland, Terence; TRAZABILIDAD CIRCULARSustainable development and circular economy policies currently prioritize the recovery of industrial waste and rubble as secondary raw materials. CDWs fine fractions of concrete nature are focusing special attention due to their accumulation, subjected to weather conditions and without any industrial application at present. These wastes have little pozzolanic activity which is why it is necessary to combine it with other active additions for the ternary cements manufacture. In the present, a laminar glass waste from the deconstruction has been selected in order to obtain the binary mix. 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 are viable for use as ecoefficient pozzolans for the more sustainable ternary cements.