Artículos en Revistas
Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/538
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Item Evaluación del proceso de prensado en la fabricación de bloques de tierra comprimida(Informes de la Construcción, 2024-06-04) Cabrera, Santiago; Darras, Gonzalo; Losa, NicolásEste trabajo pretende esclarecer los aspectos fundamentales del proceso de compresión de los bloques de tierra comprimida (BTC) y de las máquinas desarrolladas para tal fin. Para ello se presenta la percepción de diferentes fabricantes de prensas y bloques sobre la fuerza de compresión requerida para fabricar un BTC, se describe el funcionamiento de los mecanismos de acción de las prensas manuales e hidráulicas comercialmente disponibles en Sudamérica y se determina de manera analítica y experimental la fuerza máxima de compresión que estas prensas pueden aplicar. La evaluación de los resultados indica que la presión de moldeo de las prensas de accionamiento manual varía entre 3.8 y 8 kfg/cm², la aplicada por las prensas hidráulicas de baja y mediana potencia entre los 9 y 32.4 kfg/cm² y la producida por las prensas hidráulicas de alta potencia (hasta 11 kW) puede alcanzar los 64.7 kfg/cm². .Item Contemporary difficulties and challenges for the implementation and development of compressed earth block building technology in Argentina(2022) Dorado, Pablo; Cabrera, Santiago; Rolón, GuillermoThe construction with compressed earth blocks (CEB) has provoked special worldwide interest in recent decades. In Argentina it has considerable experiences due to technical research, its use in public works and the development of some manufacturing units at different scales. The particular interest of its technology transfer to low income population sectors has been central and defines the social profile with which it has been implemented in the last time. However, its contemporary development has a low territorial impact due to the fact that problems are observed that hinder the implementation, dissemination, economic support of the manufacture and CEB commercialisation and the transfer of this technology. The aim of this article is to characterize and discuss the nature of the problems that hinder further development of CEB construction technology in Argentina. Local scientific production was analysed and the agents involved in the CEB production process were identified, who were surveyed and interviewed asking their assessment of the problems that affect the development of this technology today. The results show that the technical aspects involved in the CEB manufacturing stage are the ones that have received the most attention so far, much of the current difficulties to continue with its development are focused on the implementation, dissemination, and economic sustainability of the CEB manufacturing and commercialisation and the transfer of this technology. The lack of a specific regulatory framework for this technology is transversal to these problems mentioned. With regard to the scientific field, these issues need to be incorporated into research agendas, at least at the local level.Item The effect of local pozzolans and lime additions on the mineralogical, physical and mechanical properties of compressed earth blocks in Argentina(2022) Cabrera, Santiago; Elert, Kerstin; Guilarducci, Anabela; Margasin, AndreaThe purpose of this research is to evaluate the mineralogical, physical and mechanical properties of compressed earth blocks (CEBs) stabilized with lime and mineral admixtures easily obtained in Argentina: natural pozzolans and brick powder. The mineralogical composition and pozzolanic potential of the admixtures were determined, as well as the development of hydraulic phases upon reaction with calcium hydroxide (lime), adding emphasis on the formation of hydrated cementing compounds. Samples with different percentages of lime and mineral additions were prepared to assess their compressive strength, wet erosion resistance and water absorption, and the results were contrasted with those of their counterparts, stabilized exclusively with lime or cement. The results obtained imply that both the brick powder and pozzolans used have pozzolanic properties and that, in combination with calcium hydroxide, they form amorphous phases of C-(A)-S-H. However, the use of small amounts of both additions in combination with hydrated air lime in the manufacture of CEBs adversely affected their physical and mechanical properties, compared to CEB samples stabilized only with hydrated air lime.Item Fabricación de mampuestos de tierra con reciclado de residuos de la minería de arena en Río Negro, Argentina(2023) Cabrera, Santiago; Losa, Nicolás; Darrás, GonzaloEn este trabajo se evalúa la factibilidad de emplear la arena y arcilla residuales generados por la minería de arena para fabricar bloques de tierra comprimida (BTC) y adobes. Para ello, se caracterizaron los subproductos generados por una mina en la provincia de Río Negro (Argentina) y se confeccionaron diferentes series de probetas, determinando su retracción por secado, densidad seca, resistencia a compresión y resistencia a erosión húmeda. Los resultados indican que, con una dosificación en peso de 74.25% arcilla, 24.75% arena y un 1% de paja, pueden producirse adobes portantes con una resistencia a compresión de 18.63 kgf/cm2 , mientras que, empleando una dosificación de 71.3% de arcilla, 23.7% arena y 5% de cemento Portland, pueden producirse BTC con una resistencia a compresión superior a 30 kgf/cm2 y una elevada resistencia a la erosión húmeda, aptos para emplearse en la construcción de muros de carga y muros exteriores sin revoque.