Thesis ESTUDIO COMPARATIVO DEL COMPORTAMIENTO DE MEZCLA ASFÁLTICA CON INCORPORACIÓN DE POLVO DE CAUCHO NACIONAL, MEDIANTE VÍA SECA, VERSUS MEZCLA CON ASFALTO MODIFICADO CON POLÍMEROS Y ASFALTO MULTIGRADO. TRAMO DE PRUEBA: CATAPILCO – LA LAGUNA
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Date
2018
Authors
SALAMANCA VERA, DIEGO AGUSTÍN
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Abstract
El presente trabajo contempla la confección y seguimiento de tres tramos de prueba contiguos de 500 [m] de largo cada uno, realizados con mezclas asfálticas modificadas, fabricadas con asfalto modificado con polímeros, asfalto multigrado y asfalto modificado con polvo de caucho de neumáticos fuera de uso incorporado por vía seca. El objetivo de estos tramos es comparar el comportamiento de las mezclas a través de diversos ensayes, para establecer los beneficios y desventajas de cada tramo.Los ensayos se realizan para mezcla confeccionada en laboratorio y mezcla confeccionada en planta, extraída en terreno. Los ensayos que se utilizan para comparar las mezclas son: Estabilidad – Fluidez (norma 8.302.40 del M.C.-V.8), Módulo de Rigidez (UNE-EN 12697 – 26), Ahuellamiento con Rueda de Hamburgo (AASHTO T-324), Fatiga con Viga de Cuatro Puntos (AASHTO T-321). Conjuntamente se suman ensayos de auscultación realizados en terreno al pavimento ya terminado. A nivel personal, se diseña el tramo de prueba de asfalto con caucho, se realiza la visación del asfalto modificado con polímeros y el asfalto multigrado, y luego se realizan los ensayos comparativos anteriormente descritos, a excepción de la auscultación que la ejecuta el departamento especializado del Laboratorio Nacional de Vialidad.Se comprueba que la mezcla de asfalto con caucho es más rígida que las otras mezclas modificadas. La mezcla modificada con polímeros tiene un comportamiento óptimo a fatiga y a ahuellamiento. El asfalto multigrado desarrolla un buen comportamiento al ahuellamiento, pero desarrolla un comportamiento aleatorio a la fatiga, siendo esta última la principal falla observada en los pavimentos.Finalmente, se determina que el asfalto con caucho presenta un comportamiento mecánico satisfactorio bajo condiciones susceptibles al ahuellamiento, como pueden ser estacionamientos y plazas de peaje, siempre y cuando se asegure el tiempo de digestión adecuado, lo cual es muy difícil de controlar en terreno; mientras que el asfalto modificado con polímeros presenta un comportamiento óptimo bajo todas las condiciones de tránsito. Asimismo, debe considerarse que la tecnología utilizada en la producción de asfalto con caucho por vía seca es accesible y en general las constructoras ya poseen la capacidad instalada para realizar dicha mezcla, por tanto, no sólo mejora el comportamiento del asfalto, sino que se presenta como una buena solución en el mercado actual, siendo amigable con el medio ambiente.
The present work contemplates the preparation and follow-up of three contiguous test sections of 500 [m] length each, made with modified asphalt mixtures, manufactured with polymer-modified asphalt, asphalt multigrade asphalt and recycled tire rubber asphalt incorporated by dry process. The objective of these sections is compare the behavior of the mixtures through many tests, to establish the benefits and disadvantages of each section.The tests are carried out for hot mix made in laboratory and hot mix made in plant, extracted in field. The laboratory tests used to compare the mixtures are: Stability - Fluency (standard 8.302.40 of MC-V.8), Stiffness Module (UNE-EN 12697 - 26), Hamburg Wheel Tracking (AASHTO T-324), Fatigue Life of Compacted Hot-Mix Asphalt Subjected to Repeated Flexural Bending (AASHTO T-321). In addition, are added auscultation tests of performance to the finished pavement. Personally, the asphalt rubber test section was designed, the polymer modified asphalt and multigrade asphalt was verified, and then the comparative tests described above are performed, except for the auscultation performed by the specialized department of the Highway National Laboratory.It is verified that rubber asphalt is more rigid than the other modified mixtures, however, it has a correct behavior to fatigue and rutting. The polymer-modified hot mix asphalt has an optimal fatigue and rutting behavior. The multigrade asphalt develops a good behavior to rutting, but a random behavior to fatigue, the main failure observed in chilean pavements.In addition, the benefit to the environment that generates the reuse of national out of use tires should be considered, allowing an economically viable alternative to improve the quality of the asphalt, with the contribution to the reduction of tire waste (NFU), in accordance with the new Law of Recycling Promotion, which places rubber as a priority material to be reused.Finally, it is determined that the rubber asphalt presents a satisfactory mechanical behavior under conditions of rutting, such as parking lots and toll areas; while polymer-modified asphalt exhibits optimal performance under all traffic conditions. Likewise, it should be considered that the technology used in the production of rubber asphalt by dry process is accessible and in general the constructors already have the installed capacity to make this mixture, therefore, not only improves the behavior of the asphalt, also presents as a good solution in the current market, being friendly to the environment.
The present work contemplates the preparation and follow-up of three contiguous test sections of 500 [m] length each, made with modified asphalt mixtures, manufactured with polymer-modified asphalt, asphalt multigrade asphalt and recycled tire rubber asphalt incorporated by dry process. The objective of these sections is compare the behavior of the mixtures through many tests, to establish the benefits and disadvantages of each section.The tests are carried out for hot mix made in laboratory and hot mix made in plant, extracted in field. The laboratory tests used to compare the mixtures are: Stability - Fluency (standard 8.302.40 of MC-V.8), Stiffness Module (UNE-EN 12697 - 26), Hamburg Wheel Tracking (AASHTO T-324), Fatigue Life of Compacted Hot-Mix Asphalt Subjected to Repeated Flexural Bending (AASHTO T-321). In addition, are added auscultation tests of performance to the finished pavement. Personally, the asphalt rubber test section was designed, the polymer modified asphalt and multigrade asphalt was verified, and then the comparative tests described above are performed, except for the auscultation performed by the specialized department of the Highway National Laboratory.It is verified that rubber asphalt is more rigid than the other modified mixtures, however, it has a correct behavior to fatigue and rutting. The polymer-modified hot mix asphalt has an optimal fatigue and rutting behavior. The multigrade asphalt develops a good behavior to rutting, but a random behavior to fatigue, the main failure observed in chilean pavements.In addition, the benefit to the environment that generates the reuse of national out of use tires should be considered, allowing an economically viable alternative to improve the quality of the asphalt, with the contribution to the reduction of tire waste (NFU), in accordance with the new Law of Recycling Promotion, which places rubber as a priority material to be reused.Finally, it is determined that the rubber asphalt presents a satisfactory mechanical behavior under conditions of rutting, such as parking lots and toll areas; while polymer-modified asphalt exhibits optimal performance under all traffic conditions. Likewise, it should be considered that the technology used in the production of rubber asphalt by dry process is accessible and in general the constructors already have the installed capacity to make this mixture, therefore, not only improves the behavior of the asphalt, also presents as a good solution in the current market, being friendly to the environment.
Description
Catalogado desde la version PDF de la tesis.
Keywords
AHUELLAMIENTO , ASFALTO MULTIGRADO , CAUCHO , FATIGA , MEZCLA ASFALTICA MODIFICADA CON POLIMEROS , NFU
