Articles publicats (D-AEC)http://hdl.handle.net/10256/15332024-03-29T05:26:01Z2024-03-29T05:26:01ZAn Approach to Understanding the Hydration of Cement-Based Composites Reinforced with Untreated Natural FibersLlorens Sulivera, JoanJulián Pérez, FernandoGifra Bassó, EsterEspinach Orús, XavierSoler Busquets, JordiChamorro Trenado, Miquel Àngelhttp://hdl.handle.net/10256/231202023-06-28T07:48:36Z2023-06-11T00:00:00ZAn Approach to Understanding the Hydration of Cement-Based Composites Reinforced with Untreated Natural Fibers
Llorens Sulivera, Joan; Julián Pérez, Fernando; Gifra Bassó, Ester; Espinach Orús, Xavier; Soler Busquets, Jordi; Chamorro Trenado, Miquel Àngel
The use of untreated natural fibers to reinforce cementitious composites improves their environmental friendliness, resulting in a more sustainable material. Moreover, the influence of the untreated natural fibers on the hydration process of Portland cement composites presents some uncertainties. According to the literature, the most usual tests to analyze the degree of hydration of cement composites are the differential thermal and thermogravimetric analyses (TGA/dTGA). Several authors propose to analyze data methods to establish the degree of hydration of cement composites. This paper presents the TGA/dTGA test carried out on mortar samples with and without fibers at age 2, 3, 7, 14, and 28 days. The degree of hydration was calculated according to Bhatty's method. To characterize the raw materials, the quantitative chemical was determined using scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDX). The main findings of this study were that the presence of untreated natural hemp fibers in the OPC composites increased the hydration degree by 9%. The presence of fibers affected the formation of several components. Thus, their presence increased the formation of monosulphate, reduced portlandite, did not affect ettringite, and increased the formation of calcite, thereby improving the sustainable footprint due to the increased CO2 fixation
2023-06-11T00:00:00ZIdentificación, ubicación y categorización de espacios colectivos que rompen la regularidad de una cuadrícula urbana: análisis de 25 manzanas del centro histórico de Cuenca = Identification, Location and Categorization of Collective Spaces That Break an Urban Grid’s Regularity: Analysis of 25 Blocks in the Historic Center of CuencaDurán-Hermida, Martínhttp://hdl.handle.net/10256/228932023-03-28T10:34:13Z2021-06-10T00:00:00ZIdentificación, ubicación y categorización de espacios colectivos que rompen la regularidad de una cuadrícula urbana: análisis de 25 manzanas del centro histórico de Cuenca = Identification, Location and Categorization of Collective Spaces That Break an Urban Grid’s Regularity: Analysis of 25 Blocks in the Historic Center of Cuenca
Durán-Hermida, Martín
The Historic Center of Cuenca, as every American city founded by the Spaniards, has been developed over an urban grid -an apparently repetitive regular urban fabric-. This article analyzed twenty-five blocks of the Historic Center, identified and located elements that break this grid regularity, through a mapping that distinguished the private form the collective spaces in the study area. Subsequently, it sought for common spatial characteristics in these spaces that allowed them to be categorized. Finally, the spatial configuration of each category was described, based on the space delimitation elements -recinto, portal, aula- and their possible combinations. As a result of this process, twenty-seven examples of spaces grouped into six categories were identified. These categories can be useful in order to analyze other case studies, with different urban tissues, scales and diversity; El Centro Histórico de Cuenca, como todas las ciudades hispanoamericanas fundadas por los españoles, está configurado por una cuadrícula, un tejido urbano regular aparentemente repetitivo. Este artículo analiza 25 manzanas del Centro Histórico, identifica y ubica aquellos elementos que rompen la regularidad de esta cuadrícula, mediante un mapeo del área de estudio que diferencia el espacio privado del colectivo. Posteriormente, se busca en estos espacios, características espaciales comunes, que permitan categorizarlos. Finalmente, se describe la configuración espacial de cada categoría, tomando como base los elementos de delimitación del espacio -recinto, portal, aula- y sus posibles combinaciones. Se identifican así 27 ejemplos de espacios, agrupados en seis categorías; las cuales que pueden servir para analizar otros casos de estudio con distintos tejidos urbanos, escalas y diversidad espacial
2021-06-10T00:00:00ZThe role of public administrations in promoting open municipal marketsFava, NadiaCarrasco Bonet, MartaGarrido Puig, Romàhttp://hdl.handle.net/10256/213912022-07-20T11:48:03Z2022-04-13T00:00:00ZThe role of public administrations in promoting open municipal markets
Fava, Nadia; Carrasco Bonet, Marta; Garrido Puig, Romà
Agroecological transitions require steps to be taken to shorten food circuits that prioritize local food markets and their social dimension. Such a measure would include open municipal markets (OMMs) because of their role in promoting the social nature of the agroecological transitions. In rural areas, OMMs managed by public administrations are facing a major crisis. This paper aims to decipher the claims of the actors involved in the OMM crisis and to focus on strategies that could be taken by municipalities. Semistructured questionnaires, direct observations, and participative workshops with stallholders, consumers, local producers, and the researchers of the university were used to analyze social relationships within the framework of OMMs in the Province of Girona, Catalonia. The actors revealed a lack of connection between collectives and within the same group of stallholders. The absence of shared aspirations, along with the scant interest of public bodies in investing in the markets or recognizing their economic and social role, have all contributed to the current decline in OMMs. Open municipal markets are an active asset that are at risk of being abandoned in remote rural areas. If the actors in the market could collaborate, this would help to encourage the local economy and community cohesion and to actively promote the social dimension of the agroecological transitions
2022-04-13T00:00:00ZThe Impact of COVID-19 on Municipal Food Markets: Resilience or Innovative Attitude?Fava, NadiaLaganà, Valentina RosaNicolosi, Agatahttp://hdl.handle.net/10256/210802022-05-30T10:24:40Z2022-05-07T00:00:00ZThe Impact of COVID-19 on Municipal Food Markets: Resilience or Innovative Attitude?
Fava, Nadia; Laganà, Valentina Rosa; Nicolosi, Agata
The pandemic has accelerated the search for innovative product/process/service solutions in city markets as well as the search for “open innovation challenges” more in line with current needs. The aim of the research is to understand the adaptation mechanisms of the local food system and, in particular, of the public space of the market system. The article analyses the change produced by the COVID-19 pandemic in the municipal markets of Sant Feliu de Guixols, Costa Brava, Spain. The data were collected through a semi-structured questionnaire administered to food sellers and contextually to a group of consumers. Factor analysis and the AGIL model were applied to the data collected and were confirmed with cluster analysis. The analysis highlights that the resilience of sellers is no longer sufficient and in many cases, they have equipped themselves with innovative solutions to meet the new customer demands arising from the pandemic (food delivery, e-commerce, take-away food, digital media, etc.). The document concludes with a discussion of food markets and innovations introduced in this period. Further studies can focus on the relationships between food practices and the transformation of urban spaces so that the food market can support new social practices that promote the food transition. The change would represent a switch which would provide traditionally less powerful actors, such as producers, the opportunity to reformulate the food supply chain in a way more linked to the territory. It would also create a resilient dimension for managing other possible food crises and present a challenge to achieving the ultimate goals of the businesses
2022-05-07T00:00:00Z