Evaluación de la resistencia a la compresión en morteros de pega de acuerdo con la dosificación establecida por el código Sismo Resistente Colombiano. Estudio de caso
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Universidad Distrital Francisco José de Caldas. Colombia
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Contexto: En un muro de mampostería el mortero representa entre un 10 y un 20 % del volumen total del sistema, no obstante su efecto en el comportamiento del mismo es significativamente mayor de lo que indica este porcentaje. Objetivo: El propósito de esta investigación fue evaluar la resistencia a la compresión de dos tipos de mortero de pega (A y B), preparados con muestras de arenas trituradas y naturales provenientes de la localidad de Usme en la ciudad de Bogotá.Método: Se prepararon dos tipos de mortero de pega, de acuerdo a las proporciones de cemento y arena establecidas en la sección D.3.4-1 de la NSR-10 (Tabla 1); estas proporciones fueron calculadas utilizando un recipiente de 0,0028 m3 para medidas de peso unitario. Para el mortero tipo A se empleó arena de peña y para el mortero tipo B arena de río.Resultados: La resistencia a la compresión alcanzada por el mortero tipo A al final del estudio fue en promedio de un 84% de la esperada, mientras que para los morteros tipo B esta fue en promedio un 64% por en encima de la espera.Conclusión: Las mezclas de mortero elaboradas con arena triturada o de peña (tipo A), no alcanzan la resistencia a la compresión exigida por las normas, a pesar de cumplir con la dosificación establecida en la NSR 10 y con los criterios de calidad de las NTC; mientras que la arena de origen natural o de natural de rio si cumplen con dichas normas.
Context: In a masonry wall the mortar it is between 10 and 20% of the total volume of the system, despite its effect on the behavior of it is significantly higher than this percentage indicates.Objective: The purpose of this research was to evaluate the resistance to compression of two types of mortar paste (A and B), prepared with natural sand from the town of Usme in Bogotá, in accordance with the proportions set by the Standard Colombian earthquake Resistant regulation (NSR-10).Method: Two types of mortar paste were prepared, according to the proportions of cement and sand established in NSR-10 section D.3.4-1 of (Table 1); these proportions were calculated using a 0.0028 m3 container for measuring unit weight. For type A mortar rock sand was used and river sand for type B mortar.Results: The resistance to compression for mortars type A at the end of the study was on average 84% of the expected resistance, whereas for type B mortars it averaged 64% above the expected resistance.Conclusion: Mortar mixes made with crushed or rock (type A) arena do not reach the compressive strength required demanded by regulatory standards, despite complying with the dosage established in NSR 10 and with NTC quality criteria; while the natural sand origin or natural river sand meet these standards.
Context: In a masonry wall the mortar it is between 10 and 20% of the total volume of the system, despite its effect on the behavior of it is significantly higher than this percentage indicates.Objective: The purpose of this research was to evaluate the resistance to compression of two types of mortar paste (A and B), prepared with natural sand from the town of Usme in Bogotá, in accordance with the proportions set by the Standard Colombian earthquake Resistant regulation (NSR-10).Method: Two types of mortar paste were prepared, according to the proportions of cement and sand established in NSR-10 section D.3.4-1 of (Table 1); these proportions were calculated using a 0.0028 m3 container for measuring unit weight. For type A mortar rock sand was used and river sand for type B mortar.Results: The resistance to compression for mortars type A at the end of the study was on average 84% of the expected resistance, whereas for type B mortars it averaged 64% above the expected resistance.Conclusion: Mortar mixes made with crushed or rock (type A) arena do not reach the compressive strength required demanded by regulatory standards, despite complying with the dosage established in NSR 10 and with NTC quality criteria; while the natural sand origin or natural river sand meet these standards.
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Mortar paste, rock sand, river sand, compressive strength, dosing, Mortero de pega, arena de peña, arena de río, resistencia a la compresión, dosificación