Congreso Internacional de Construcción Sostenible y Soluciones Ecoeficientes (2º. 2015. Sevilla) [0]

URI permanente para esta colecciónhttps://hdl.handle.net/11441/33270

Examinar

Examinando Congreso Internacional de Construcción Sostenible y Soluciones Ecoeficientes (2º. 2015. Sevilla) [0] por Autor "Cárdenas, Juan Pablo"

Seleccione resultados tecleando las primeras letras
Mostrando 1 - 2 de 2
  • Miniatura
    Acceso AbiertoPonencia
    Analysis of the variables that affect the strength of concrete with recycled aggregates from prefabricated pipes
    (Universidad de Sevilla, Departamento de Construcciones Arquitectónicas I, 2015) Terela, Ester; Letelier, Viviana; Osses, Rodriguez; Cárdenas, Juan Pablo; Moriconi, Giacomo
    The influence of several parameters in the compressive and flexural strength of concrete with recycled aggregates is analyzed. The concretes are dosed for a compressive strength of 30MPa. The recycled aggregates are obtained from debris of prefabricated concrete pipes with a compressive strength of 20MPa. Four variables are considered in this analysis: the percentage of natural course aggregates that are replaced by recycled ones; the amount of mortar adhered to the surface of the aggregates, that will be reduced applying mechanical abrasion processes instead of the chemical traditional ones; the maximum size of the replaced aggregates and the percentage of cement addition specified in the dosing. Taguchi’s statistical method is used considering three levels for each of the four parameters to determine their effects on the material behavior, minimizing the number of the experimental tests required. The tests are performed after curing the samples during 28 and 90 days. The three levels for each parameter are stablished after former studies and/or previous experimental tests. The results are quantified through the analysis of variance methodology (ANOVA), to determine which of the variables has higher effects in the final strengths. The results show that materials with equivalent compressive strengths to those of a control concrete can be obtained restricting the percentage of replaced aggregates to 30% and reducing the amount of adhered mortar through abrasion processes, when the samples have been cured for 28 days. The effect of the size of the recycled aggregates gains significance after 90 days of curing, while the amount of cement addition controls the flexural strength. These results indicate that materials with equivalent mechanical properties to those of a control concrete can be obtained by controlling several parameters, allowing the reuse of debris and reducing the amount of natural course aggregates needed significantly.
  • Miniatura
    Acceso AbiertoPonencia
    Analysis of the variables that affect the strength of concrete with recycled aggregates from prefabricated pipes.
    (Universidad de Sevilla, Departamento de Construcciones Arquitectónicas I, 2015) Tarela, Ester; Letelier, Viviana; Osses, Rodriguez; Cárdenas, Juan Pablo; Moriconi, Giacomo
    The influence of several parameters in the compressive and flexural strength of concrete with recycled aggregates is analyzed. The concretes are dosed for a compressive strength of 30MPa. The recycled aggregates are obtained from debris of prefabricated concrete pipes with a compressive strength of 20MPa. Four variables are considered in this analysis: the percentage of natural course aggregates that are replaced by recycled ones; the amount of mortar adhered to the surface of the aggregates, that will be reduced applying mechanical abrasion processes instead of the chemical traditional ones; the maximum size of the replaced aggregates and the percentage of cement addition specified in the dosing. Taguchi’s statistical method is used considering three levels for each of the four parameters to determine their effects on the material behavior, minimizing the number of the experimental tests required. The tests are performed after curing the samples during 28 and 90 days. The three levels for each parameter are stablished after former studies and/or previous experimental tests. The results are quantified through the analysis of variance methodology (ANOVA), to determine which of the variables has higher effects in the final strengths. The results show that materials with equivalent compressive strengths to those of a control concrete can be obtained restricting the percentage of replaced aggregates to 30% and reducing the amount of adhered mortar through abrasion processes, when the samples have been cured for 28 days. The effect of the size of the recycled aggregates gains significance after 90 days of curing, while the amount of cement addition controls the flexural strength. These results indicate that materials with equivalent mechanical properties to those of a control concrete can be obtained by controlling several parameters, allowing the reuse of debris and reducing the amount of natural course aggregates needed significantly.