Abstract
En este trabajo se evalúa el efecto de la sustitución parcial de cemento portland por metacaolín (MK) y ceniza decascarilla de arroz (RHA) sobre las propiedades mecánicas y de durabilidad de mezclas de concretos. Para ello, seutilizaron dos tipos de RHA, el primero obtenido mediante un tratamiento térmico de la cascarilla de arroz (TRHA)y el segundo a través de un proceso termoquímico (ChRHA). MK fue producido por tratamiento térmico a 700° C durante dos horas de un caolín Colombiano. Se evalúan la resistencia a a la compresión y la durabilidad delas concretos; que incluye la absorción de agua, la penetración de iones cloruro, la carbonatación y la resistenciaa los sulfatos. Como materiales de referencia se utilizaron un concreto sin adición y humo de sílice (SF). Losresultados en general indican un efecto positivo en las propiedades mecánicas y la durabilidad de los hormigones,lo que demuestra la viabilidad de la utilización en ingeniería de estas adiciones como materiales cementantessuplementarios, lo cual contribuye positivamente a la sostenibilidad del medio ambiente.
Highlights
Concrete industry produces a large amount of greenhouse gases resulting mainly from release of carbon dioxide from limestone in the thermal decomposition of calcium carbonate (CaCO3) during the processing of clinker
This paper presents the evaluation of the performance in concrete of pozzolanic materials made from Metakaolin (MK) and two types of rice husk ashes (RHA), produced with Colombian raw materials, on mechanical and durability properties of concrete mixes
In the case of the normalized compressive strength relative to those of the control mixture presented in Figure 3 (b), a maximum effect is observe for 28 days of curing, indicating that the pozzolanic action was higher in this period
Summary
Concrete industry produces a large amount of greenhouse gases resulting mainly from release of carbon dioxide from limestone in the thermal decomposition of calcium carbonate (CaCO3) during the processing of clinker. Various types of SCM, such as Metakaolin (MK), fly ash (FA), silica fume (SF), rice husk ash (RHA), and others have been widely used in concrete, their utilization reports economic and environmental benefits and means increasing mechanical and durability properties, preserving the environment at the same time (Khatri & Sirivivatnanon, 1995, Turanli et al, 2004, Giaccio et al, 2007; Hwang et al, 2011). High quality RHA has been produced by many researchers under controlled conditions and it has been used as a highly reactive pozzolanic material, leading to a significant improvement on strength and durability of normal concretes (Jauberthie et al, 2003, Hwang et al, 2011, Rodríguez de Sensale, 2010; Chandrasekhar et al, 2002, 2003; Salas et al, 2009, Ramezanianpour & Bahrami, 2012; Turanli et al, 2004). Portland cement concretes without addition and added with 10% by weight of silica fume were used as reference materials
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