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Browsing Centros UC by browse.metadata.categoriaods "12 Producción y consumo responsable"
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- ItemA lightweight fiber-based approach to reduce the risk of concrete detachment in shotcrete fortified tunnels(2020) Ortiz, C.; Lillo Gallardo, Patricio Andrés; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
- ItemA methodology for assessing the chemical and physical potential of industrially sourced rice husk ash on strength development and early-age hydration of cement paste(2017) ZuninoSommariva,Franco; CEDEUS (Chile)
- ItemAir Bubbles as an Admixture for Printable Concrete: A Review of the Rheological Effect of Entrained Air(2022) Eugenin, C.; Navarrete, I.; Brevis Vergara, Wernher Ariel; Lopez, M.; CEDEUS (Chile)
- ItemAssessing and understanding the interaction between mechanical and thermal properties in concrete for developing a structural and insulating material(2017) Remesar Lera, José Carlos; Vera Araya, Sergio Eduardo; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
- ItemAwareness, actions, drivers and barriers of sustainable construction in chile(2013) Serpell Bley, Alfredo; Kort, Jorge; Vera Araya, Sergio Eduardo; CEDEUS (Chile)
- ItemCollaborating in decision making of sustainable building design : An experimental study comparing CBA and WRC methods(2016) Arroyo Riquelme, Paz; Fuenzalida, C.; Albert, A.; Hallowell, M.; CEDEUS (Chile)
- ItemCopper entrapment and immobilization during cement hydration in concrete mixtures containing copper tailings(2021) Vargas, Felipe; Alsina, Marco A.; Gaillard, Jean-François; Pasten Gonzalez, Pablo Arturo; López, Mauricio; CEDEUS (Chile)The use of copper tailings as supplementary cementitious material can reduce the environmental impacts ofconcrete production and the mining industry. A key concern limiting its application is the potential leaching oftoxic metals from the cementitious matrix, especially copper. To analyze and reduce the risk of leaching, themechanisms by which copper is entrapped in the cementitious matrix were investigated, by combining micro-scopic and spectroscopic approaches. Decreasing the water-to-binder ratio was statistically relevant to reducecopper leaching. Scanning Electron Microscope micrographs allowed to spatially localize enriched copperclusters within the cementitious hydration products. In the early stages of the cementitious hydration (i.e., 24 h),no spatial correlation between copper and hydration products was found; however, after seven days, copper wasspatially associated with calcium silicate hydrates. Cu K-edge X-ray absorption near edge structure spectroscopyprovided insights into the chemical speciation of copper in the cementitious matrix. It showed that copper sulfideand oxide phases persisted, whereas the copper sulfate phases were prone to dissolution and reprecipitation ascupric hydroxides induced by the relatively high pH from calcium hydroxides formed during hydration. Pro-moting the formation of hydration products can further reduce copper leaching from the alkaline cementitiousmatrix. A better understanding of metal entrapment mechanisms could lead to new strategies that reduce themobility of toxic elements when using copper tailings, increasing their use as a replacement of cement. With thisknowledge, it is expected to answer if it is possible to improve the copper entrapment into the cementitiousmatrix and if there is a risk of leaching once is entrapped.
- ItemDecoupling the physical and chemical effects of supplementary cementitious materials on strength and permeability : A multi-level approach(2016) ZuninoSommariva,Franco; CEDEUS (Chile)
- ItemDeveloping a very high-strength low-CO2 cementitious matrix based on a multi-binder approach for structural lightweight aggregate concrete(2020) Mena, J.; González, Marcelo; Remesar Lera, José Carlos; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
- ItemDevelopment of a new supplementary cementitious material from the activation of copper tailings: Mechanical performance and analysis of factors(2018) Vargas, Felipe; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
- ItemDoes energy efficiency matter to real estate-consumers? Survey evidence on willingness to pay from a cost-optimal analysis in the context of a developing country(2018) Encinas Pino, Felipe; Marmolejo Duarte, Carlos; Sánchez De La Flor, Francisco; Aguirre, Carlos; CEDEUS (Chile)
- ItemEffect of supplementary cementitious materials on viscosity of cement-based pastes(2022) Navarrete, I.; Kurama, Y.; Escalona, N.; Brevis Vergara, Wernher Ariel; Lopez, M.; CEDEUS (Chile)
- ItemEnergy-efficient real estate or how it is perceived by potential homebuyers in four latin american countries(2019) Encinas Pino, Felipe; Marmolejo Duarte, Carlos; Wagemann Farfán, Elizabeth; Aguirre Núñez, Carlos Andrés; CEDEUS (Chile)
- ItemEnvironmental impacts evaluation of treated copper tailings as supplementary cementitious materials(2020) Vargas Muñoz, Felipe Andrés; López Casanova, Mauricio Alejandro; Rigamonti, L.; CEDEUS (Chile)
- ItemEstimating the segregation of concrete based on mixture design and vibratory energy(2016) Navarrete, I.; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
- ItemFlexural behavior of stratified reinforced concrete: construction, testing, analysis, and design(2017) Navarrete, Ivan; Hube Ginestar, Matías Andrés; Kurama, Yayah; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
- ItemFlue gas desulfurization (FGD) fly ash as a sustainable, safe alternative for cement-based materials(2021) Navarrete Leschot, Iván Ignacio; Vargas Muñoz, Felipe Andrés; Paul, Álvaro; López Casanova, Mauricio Alejandro; Martínez, Patricia; CEDEUS (Chile)The reduction in fly ash production in coal-fired power plants has created an opportunity to explore alternative types of fly ashes previously deemed unfit for use in concrete. In plants using flue gas desulfurization (FGD) processes, fly ash could contain high amounts of sulfur oxides, making its use in concrete inadvisable. However, the type of sulfur compound present in a fly ash strongly impacts its performance in concrete. In this study, two types of fly ash were used to evaluate the effect of sulfur oxides on mortar mixtures incorporating fly ash as supplementary cementitious material (SCM); one from an FGD unit, with high sulfur oxide content (in the form of hannebachite), and the other generated in a system without FGD, with negligible sulfur oxide. Calorimetry results show that hannebachite can effectively control C3A hydration similar to gypsum; however, its presence in FGD fly ash does not induce deleterious expansion associated with internal sulfate attack in mortars. TGA and XRD analyses suggest that hannebachite has lower reactivity than sulfate. Hannebachite not only maintains the pozzolanic reactivity of the fly ash, but its fineness may promote OPC hydration, increasing compressive strength. The results of this study indicate that FGD fly ash can be used as an SCM, allowing more sustainable concrete production.
- ItemImpact of physical and physicochemical properties of supplementary cementitious materials on structural build-up of cement-based pastes(2020) Navarrete Leschot, Iván Ignacio; Kurama, Y.; Escalona, Néstor; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
- ItemImproved balance between compressive strength and thermal conductivity of insulating and structural lightweight concretes for low rise construction(2020) Remesar Lera, José Carlos; Simon, F.; Vera Araya, Sergio Eduardo; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
- ItemMulti-layer casting of self-consolidating concrete: Influence of mortar rheology and casting parameters on the inter-layer bond strength(2021) Navarrete Leschot, Iván Ignacio; López Casanova, Mauricio Alejandro; Kurama, Yahya; CEDEUS (Chile)Inter-layer bond strength is a critical factor to achieve structurally sound monolithic concrete structures. This paper discusses the effects of the cementitious paste volume (CP%vol), structural build-up of mortar (Athixm), and their interactions with casting parameters (i.e., free fall height (HFF), and delay time) on the residual bond strength of multi-layer self-consolidating concrete. It is found that the residual bond strength can be improved by increasing the CP%vol and HFF, or by reducing the delay time and Athixm. Out of the factors investigated, Athixm has the largest effect on both the residual bond strength and the critical delay time.