21 research outputs found

    Viability of Cupola Slag as an Alternative Eco-Binder and Filler in Concrete and Mortars

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    ABSTRACT: Obtaining new materials capable of meeting society?s demands motivates the search for new solutions that are capable of satisfying twofold requirements: respect for the environment and obtaining more durable and resistant materials. Cupola slag is a by-product generated in the process of obtaining ductile iron. When the slag undergoes rapid cooling, its vitrification is favored, leaving the silica in an amorphous structure and, thus, susceptible to reacting. Through reaction, the slag can develop cementing properties and cement can consequently be partially replaced with residue, providing savings in economic and environmental costs compared to traditional hydraulic binders. In this study, the physical and chemical properties of cupola slag and its recovery process are analyzed. Mortars that incorporate traditional admixtures (fly ash and limestone filler) have been manufactured and consistency and mechanical properties have been compared with mortars that incorporate cupola slag admixture. Mortars have also been manufactured with normalized sand and with Portland cement replacements (0, 10, 20, and 30% by weight) with cupola slag, and both the consistency and the mechanical properties have been compared at 7, 28, 60, and 90 days. The results obtained show the suitability of cupola slag as a binder and as an admixture, with respect to the traditional ones, and how the mechanical properties tend to converge for all of the replacement levels characterized, for ages close to 90 days of age

    Fatigue Behaviour of Concrete Using Siderurgical Aggregates

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    The use of concrete with aggregates with reduced environmental impact, as is the case of concrete with siderurgical aggregates (recovered slags), will inevitably increase in the future, as a result of policies promoting development of more sustainable construction materials. These concretes offer an excellent response to static loads, but their behaviour under dynamic loads has not yet been studied. The aim of this study is to characterize the fatigue behaviour, in terms of fatigue limit, of a concrete with siderurgical aggregates by comparing it with an analogous conventional limestone concrete. This characterization was carried out using the Locati method, which stands out for its convenience, speed and low cost, with the feature of being carried out at a high frequency corresponding to the resonance frequency. Performing high-frequency tests has drastically reduced test times and thus costs. Likewise, the results obtained show that, using various criteria found in the literature, concrete with siderurgical aggregates has a higher fatigue limit in absolute terms (MPa), but a lower one in relative terms (% fc).This research was co-financed by the European Regional Development Fund (ERDF) and the Ministry of Economy, Industry, and Competitiveness (MINECO) within the framework of the project RTC-2016-5637-3

    EducaFarma 11.0

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    Memoria ID2022-036. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2022-2023

    Wild edible plants: Nutritional and toxicological characteristics, retrieval strategies and importance for today's society

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    Wild edible plants (WEPs) are part of the cultural and genetic heritage of different regions of the world. In times of famine and scarcity, these sources of nutrients and health-promoting compounds have received high importance mainly in rural and suburban areas. Although currently underutilized, WEPs are still consumed traditionally by different communities and are gaining relevance in today's society. However, these foods lack recognition as significant contributors to the human diet in developed areas. This review describes the nutritional value of WEPs from the North-eastern region of Portugal and points out those containing potentially toxic compounds. Several retrieval strategies are presented with the aim of promoting the (re)use, production, commercialization and conservation of WEPs (wild harvested plants and crop wild relatives), and their importance for social, economic and agro-ecological development is highlighted.The authors are grateful to the Foundation for Science and Technology of Portugal and FEDER, under Programme PT2020, for financial support to CIMO (UID/AGR/00690/2013). J. Pinela thanks FCT for his grant (SFRH/BD/92994/2013) funded by European Social Fund and Portuguese Ministry of Education and Science (MEC) through Programa Operacional Capital Humano (POCH).info:eu-repo/semantics/publishedVersio

    Educafarma 10.0

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    Memoria ID-030. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2021-2022

    Evolving trends in the management of acute appendicitis during COVID-19 waves. The ACIE appy II study

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    Background: In 2020, ACIE Appy study showed that COVID-19 pandemic heavily affected the management of patients with acute appendicitis (AA) worldwide, with an increased rate of non-operative management (NOM) strategies and a trend toward open surgery due to concern of virus transmission by laparoscopy and controversial recommendations on this issue. The aim of this study was to survey again the same group of surgeons to assess if any difference in management attitudes of AA had occurred in the later stages of the outbreak. Methods: From August 15 to September 30, 2021, an online questionnaire was sent to all 709 participants of the ACIE Appy study. The questionnaire included questions on personal protective equipment (PPE), local policies and screening for SARS-CoV-2 infection, NOM, surgical approach and disease presentations in 2021. The results were compared with the results from the previous study. Results: A total of 476 answers were collected (response rate 67.1%). Screening policies were significatively improved with most patients screened regardless of symptoms (89.5% vs. 37.4%) with PCR and antigenic test as the preferred test (74.1% vs. 26.3%). More patients tested positive before surgery and commercial systems were the preferred ones to filter smoke plumes during laparoscopy. Laparoscopic appendicectomy was the first option in the treatment of AA, with a declined use of NOM. Conclusion: Management of AA has improved in the last waves of pandemic. Increased evidence regarding SARS-COV-2 infection along with a timely healthcare systems response has been translated into tailored attitudes and a better care for patients with AA worldwide

    La renovación de la palabra en el bicentenario de la Argentina : los colores de la mirada lingüística

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    El libro reúne trabajos en los que se exponen resultados de investigaciones presentadas por investigadores de Argentina, Chile, Brasil, España, Italia y Alemania en el XII Congreso de la Sociedad Argentina de Lingüística (SAL), Bicentenario: la renovación de la palabra, realizado en Mendoza, Argentina, entre el 6 y el 9 de abril de 2010. Las temáticas abordadas en los 167 capítulos muestran las grandes líneas de investigación que se desarrollan fundamentalmente en nuestro país, pero también en los otros países mencionados arriba, y señalan además las áreas que recién se inician, con poca tradición en nuestro país y que deberían fomentarse. Los trabajos aquí publicados se enmarcan dentro de las siguientes disciplinas y/o campos de investigación: Fonología, Sintaxis, Semántica y Pragmática, Lingüística Cognitiva, Análisis del Discurso, Psicolingüística, Adquisición de la Lengua, Sociolingüística y Dialectología, Didáctica de la lengua, Lingüística Aplicada, Lingüística Computacional, Historia de la Lengua y la Lingüística, Lenguas Aborígenes, Filosofía del Lenguaje, Lexicología y Terminología

    Estudio pedagógico de la promoción y titulación del alumnado de ESO durante el período 1992-96 de implantación anticipada de dicha etapa, en un IES de ámbito rural : IES Hoces del Duratón - Cantalejo (Segovia)

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    No está publicadoInvestigación realizada en el IES Hoces del Duratón de Cantalejo (Segovia) por un profesor que en la actualidad trabaja en el IES 'Juan de Juni' de Valladolid y una profesora colaboradora que sigue trabajando en el IES de Cantalejo (Segovia). El objetivo es disponer de información sobre promoción y titulación del alumnado de ESO, tomar conciencia de la importancia del Claustro en el proceso evaluador, ilustrar otras experiencias sobre la implantación anticipada de ESO y aportar información de base sobre el tema. La metodología se basó en la revisión estadística de la documentación de Secretaría y de documentos oficiales del IES (el Proyecto Educativo del Instituto y el Proyecto Curricular de Etapa) además del análisis crítico de la normativa básica sobre evaluación en ESO. La naturaleza de la investigación sólo exigía evaluación interna (logro de los objetivos). Han dividido el estudio en los siguientes apartados: antecedentes, marco normativo y fundamentación legal del proceso evaluador en la LOGSE; datos estadísticos y gráficos, globales y por áreas; resultados referidos al número de áreas suspensas y conclusiones. Se ha elaborado una memoria de 150 folios y dos disquetes, que incluyen gráficos y tablas estadísticas, además del análisis de documentos y redacción de conclusiones sobre el proceso evaluador. Los materiales utilizados han sido los datos del programa LOGES de gestión de centros, actas, sábanas de notas, legislación, bibliografía pedagógica y documentación de acceso restringido a las Juntas de evaluación (notas incluyendo observaciones, etc.) de la que se ha utilizado la que no vulneraba el secreto profesional.Junta de Castilla y León, Dirección General de Universidades e InvestigaciónCastilla y LeónES

    Elaboración de materiales curriculares y recursos documentales de apoyo a la acción tutorial

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    El trabajo ha sido realizado en el Instituto de Enseñanza Secundaria 'Hoces del Duratón' (Segovia) por un grupo de 16 profesores del mismo. Los objetivos que persiguen son elaborar y experimentar con materiales curriculares de apoyo a la acción tutorial. El proceso que han seguido ha sido el siguiente: Propuesta semanal de materiales, discusión en grupo, experimentación en el aula y reelaboración definitiva (investigación-acción). Resultados: existió evaluación por parte de los participantes, del alumnado, de la CCP y del SITE de Educación de Segovia. Los materiales utilizados han sido publicaciones del MEC y artículos de prensa. El trabajo no está publicado..Comunidad Autónoma de Castilla y León, Consejería de Educación y Cultura, Dirección General de EducaciónCastilla y LeónES
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