MEJORAMIENTO DE LA RESISTENCIA AL DESLIZAMIENTO POR MEDIO DE MEZCLAS DE AGREGADO
El objetivo de esta investigacion fue indagar la factibilidad de mejorar las caracteristicas friccionantes de agregados con valor de pulido bajo, mezclandolos con agregados de valor de pulido alto, y encontrar la proporcion de mezclado mas adecuada. Se evaluaron agregados provenientes del estado de Coahuila y Nuevo Leon, a cada muestra se le realizaron ensayos de residuo insoluble en acido (Tex 638-J), sanidad del agregado y pulimento acelerado (Tex 438-A). Los agregados a mezclar se seleccionaron del ensayo de pulimento acelerado. Los porcentajes de mezclado fueron 50/50, 60/40, 70/30 y 80/20 de agregado con alto y bajo valor de pulido. A los agregados y mezclas se les determino el coeficiente de friccion inicial, el valor de pulido y la tasa de pulido. Los resultados indican que las mezclas de agregado presentaron un mejoramiento en el valor de pulido de una o dos unidades por cada 10% de incremento de agregado con valor de pulido alto en la mezcla. Se encontro que las mezclas de agregado escoria-caliza y granito-dolomita en proporcion 80/20 de agregado con alto y bajo valor de pulido respectivamente, son resistentes al pulido. La mezcla granito-caliza en sus diferentes proporciones resulto susceptible al pulido. Se incluyen tablas, figuras y conclusiones. Abstract: The objetive of this investigation was to investigate the feasibility of improving the friction characteristics of aggregates with a low polish value, blending them with aggregates with a high polish value, and find the appropriated blend proportion. Aggregates from the states of Coahuila and Nuevo Leon were evaluated, to each sample was tested for insoluble acid residue (Tex 612-J), aggregate soundness by use of magnesium sulfate and accelerated polishing (Tex 438-A). Based on test results by accelerated polishing, the aggregates for blending were selected. The blend percentage used were 50/50, 60/40, 70/30 and 80/20 of aggregate with high and low polish values, respectively. The initial friction coefficient, polish value and polish rate were determined for the aggregates and each different blends.The results indicate that the aggregate blends presented an improvement in the polish value of one or two units for each 10% increase of aggregate with a high polish value in the blend. It was found that the blend of slag-limestone and granite-dolomita in a proportion 80/20 , the aggregate with high and low polish value, were more resistant to the polishing. Whereas the granite-limestone blend in its different proportions was susceptible to the polish. Included tables, figures and conclusions.
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Availability:
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Authors:
- FLORES FLORES, M
- GOMEZ LOPEZ, J A
- GARNICA ANGUAS, P
- Publication Date: 2010
Language
- Spanish
Media Info
- Pagination: xii+60p
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Serial:
- PUBLICACION TECNICA
- Issue Number: 340
- Publisher: Instituto Mexicano del Transporte
- ISSN: 0188-7297
Subject/Index Terms
- TRT Terms: Aggregates; Skid resistance
- Geographic Terms: Mexico
- ITRD Terms: 4577: Agregados; 8072: Mexico; 3031: Resistencia al deslizamiento; VALOR DE PULIDO
- Subject Areas: Geotechnology; I52: CONSTRUCCION DE FIRMES Y PAVIMENTOS;
Filing Info
- Accession Number: 01343675
- Record Type: Publication
- Source Agency: Instituto Mexicano del Transporte
- Files: ITRD
- Created Date: Jul 12 2011 9:43AM