Hormigon Compactado Con Rodillo

Hormigón Compactado con Rodillo

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Desde aproximadamente el año 1975 se ha venido utilizando en forma cada vez más extendida la técnica del hormigón compactado con rodillo vibratorio u hormigón rodillado.

Esta técnica consiste básicamente en el empleo de un hormigón de muy baja fluidez, no medible mediante el asentamiento de cono, por lo que es posible utilizar rodillos vibratorios para su compactación

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El hormigón compactado con rodillo es un hormigón generalmente puesto en obra por medio de una extendedora normalmente empleada en la colocación de hormigón asfáltico.

A continuación la capa es nivelada y apisonada mediante un rodillo vibrante. El hormigón compactado se utiliza especialmente en USA para la construcción de presas, el hormigonado de grandes superficies (aparcamientos) y firmes de carretera.

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La composición del hormigón compactado es similar a la de hormigón normal con una consistencia de tierra húmeda. Se recomienda el empleo de áridos de machaqueo para mejorar la resistencia resistencia inicial.

Es muy importante que los áridos gruesos, la arena, el ligante (cemento normal) y el contenido de agua estén perfectamente dosificados.

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Usos y Aplicaciones Aplicaciones Este concreto se utiliza principalmente para: Represas hidroeléctricas. Diques de gravedad. • •

Contra pisos. Losa Industriales donde se requiera soportar las cargas a la flexión. Bacheos, rellenar, alisar, recubrir Pistas de aviones Carreteras • • • •

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3. Ventajas Concreto de larga vida útil. Menores costos de construcción a largo plazo por bajos costos en el mantenimiento. Calidad estandarizada. Alta capacidad de carga. Mayor facilidad de construcción. Deformación Deformación mínima de la superficie. •

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4. Componentes Grava, arena 75% 85% del volumen de la mezcla •

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Dosificación En primer término, el tamaño máximo del árido grueso se fija principalmente entre 3/4” y 3”, 3” , por las condiciones de segregabilidad segregabilidad del hormigón, oscilando éste entre según sea la aplicación que se le dará. Por su parte, para obt obtener ener la baja fluidez antes señalada, la dosis de agua normalmente normalmente necesaria varía alrededor de las cantidades que se señalan en la tabla

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Para determinar la granulometría más adecuada para el hormigón puede utilizarse como punto de partida alguna curva de referencia similar a las del hormigón convencional, pero tal, que el contenido de partículas de árido grueso mayor que 5 mm no supere, ni que el contenido total de partículas de tamaño inferior a 0.08mm, incluso el cemento, sea inferior a los valores de la tabla IV.46 en primera aproximación:

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Diseño Dosificación por ensayos de consistencia Base análisis de trabajabilidad de la mezcla para CCR viendo que tan seca para soportar el peso de compactación y suficientemente húmeda para permitir la distribución de la pasta en toda la

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Dosificación por ensayos de compactación por impacto Base: perdida de resitencia de una mezcla para CCR por mayor o menos humedad de la requerida por variación de RA/C

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Curado y construcción de las juntas

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Control de Calidad

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