Publication: CORRELACIÓN ENTRE EL ENSAYO ASTM C 1609 Y EL ENSAYO BARCELONA GENERALIZADO PARA LA CARACTERIZACIÓN DE LA TENACIDAD DE HRF
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Date
2017
Authors
ÁVALOS LAFLOR, FREDDY ALEXIS
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Abstract
Actualmente, las especificaciones de diferentes proyectos de pavimentación y sostenimiento de túneles mediante shotcrete, establecen parámetros basados en los resultados del ensayo de flexión con cargas a los tercios, ejecutado según la norma ASTM C 1609, para el control de los hormigones reforzados con fibras (HRF). Sin embargo, este ensayo es ampliamente cuestionado para el control de obras debido a su inestabilidad en la transición entre el régimen pre y post agrietamiento, por los errores en la medición de la deflexión y por la alta variabilidad de los resultados obtenidos. Frente a esta situación, para el control de los HRF en obra, se ha propuesto el uso del ensayo Barcelona Generalizado, cuyos resultados tienen una variabilidad considerablemente menor que el anterior y no presenta inestabilidad al momento del agrietamiento.El objetivo de esta memoria de titulación es establecer una correlación entre la tenacidad determinada mediante el ensayo de flexión ejecutado según la norma ASTM C 1609 y el ensayo Barcelona Generalizado que pueda ser aplicada en obra.Para lograr el objetivo propuesto, en el LEMCO se prepararán dos hormigones tipo G-30, los que se reforzarán con 5 y 8 Kg/m³ de fibras sintéticas, con los que se moldearán probetas prismáticas y cilíndricas, las que serán ensayadas según la norma ASTM C 1609 y Barcelona Generalizado respectivamente. Con los resultados obtenidos, se propondrá una correlación para la tenacidad determinada con ambos ensayos.
Currently, the specifications of different paving and tunnel support projects using shotcrete establish parameters based on the results of the bending test with third loads, executed according to ASTM C 1609, for the control of fiber reinforced concrete (HRF). However, this test is widely questioned by the control of construction sites due to its instability in the transition between the pre and post cracking regime, the errors in the measurement of deflection and the high variability of the results obtained. Due to this, the use of the Generalized Barcelona test has been proposed for the control of the HRF at construction works. The results have a considerably lower variability than the first mentioned one and does not present instability at the moment of cracking.The objective of this titration memorandum is to establish a correlation between the toughness determined by the flexural test performed according to ASTM C 1609 and the generalized Barcelona test that can be applied on site.In order to achieve the proposed objective, in the LEMCO two concrete of type G-30 will be prepared, they will be reinforced with 5 and 8 kg / m3 of synthetic fibers, and which will be molded into prismatic and cylindrical specimens, and which then will be tested according to the ASTM C 1609 standard and Generalized Barcelona test respectively. With the results obtained, a correlation will be proposed for the tenacity determined with both tests.
Currently, the specifications of different paving and tunnel support projects using shotcrete establish parameters based on the results of the bending test with third loads, executed according to ASTM C 1609, for the control of fiber reinforced concrete (HRF). However, this test is widely questioned by the control of construction sites due to its instability in the transition between the pre and post cracking regime, the errors in the measurement of deflection and the high variability of the results obtained. Due to this, the use of the Generalized Barcelona test has been proposed for the control of the HRF at construction works. The results have a considerably lower variability than the first mentioned one and does not present instability at the moment of cracking.The objective of this titration memorandum is to establish a correlation between the toughness determined by the flexural test performed according to ASTM C 1609 and the generalized Barcelona test that can be applied on site.In order to achieve the proposed objective, in the LEMCO two concrete of type G-30 will be prepared, they will be reinforced with 5 and 8 kg / m3 of synthetic fibers, and which will be molded into prismatic and cylindrical specimens, and which then will be tested according to the ASTM C 1609 standard and Generalized Barcelona test respectively. With the results obtained, a correlation will be proposed for the tenacity determined with both tests.
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Catalogado desde la version PDF de la tesis.
Keywords
FIBRAS POLIPROPILENO , HORMIGON , TENACIDAD DE HRF