Facultad Regional Santa Fe

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    Resistencia a erosión húmeda en Bloques de Tierra Comprimida : Evaluación de diferentes métodos para el análisis de resultados
    (2021) Cabrera, Santiago; González, Ariel
    En esta investigación se analizan los diferentes métodos de ensayo propuestos por la normativa internacional para evaluar la resistencia al intemperismo físico y, particularmente, a la erosión húmeda de los bloques de tierra comprimida (BTC), examinando las superficies erosionadas. Además, se proponen 2 alternativas diferentes a la propuesta por las normas para evaluar los resultados de estos ensayos: pérdida de masa y cotejo directo con patrones gráficos de comparación; analizando finalmente la viabilidad de cada método. Finalmente, se observó que el método de comparación directa con patrones sólo es efectivo para evaluar la resistencia a la erosión húmeda de las probetas sometidas al ensayo de pulverizado de agua a presión, mientras que el método de la determinación de la pérdida de masa no es adecuado para evaluar los resultados de este tipo ensayos.
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    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, Andrea
    The 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.