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Diapositiva 1

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AGREGADOS PETREOS Limpieza

Ing. MS.c Hugo Léon Arenas Lozano

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Diapositiva 2

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Diapositiva 3

LIMPIEZA Y PARTICULAS PERJUDICIALES ENSAYOS DE EVALUACION – EQUIVALENTE DE ARENA – MATERIA ORGANICA – GRANULOMETRIA – LIMITES DE ATTERBERG – VALOR DE AZUL DE METILENO – PARTICULAS DELEZSNABLES O FRIABLES Y TERRONES DE ARCILLA – LIMPIEZA SUPERFICIAL DEL AGREGADO GRUESO

Hugo León Arenas Lozano

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Diapositiva 4

LIMPIEZA  Límite Líquido: INV E-125  Índice de Plasticidad : INV E-126

 Equivalente de Arena: INV E-133  Valor de Azul de Metileno: INV E-235

 Terrones de arcilla y partículas deleznables: INV E211  Partículas Livianas: INV E-221

 Limpieza superficial del agregado grueso: INV E-267  Material Orgánica Hugo León Arenas Lozano

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LIMPIEZA DE LAS PARTICULAS  Límite Líquido: INV E-125  Índice de Plasticidad : INV E-126  Equivalente de Arena: INV E-133

 Valor de Azul de Metileno: INV E-235  Terrones de arcilla y partículas deleznables: INV E-211  Partículas Livianas: INV E-221  Limpieza superficial del agregado grueso: INV E-267  Material Orgánica

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LIMPIEZA DE LAS PARTICULAS Pérdida de las propiedades mecánicas Durabilidad de la estructura Mala adherencia ▫ Arcilla, materia orgánica, livianas

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Sustancias perjudiciales CONTAMINANTES

QUIMICAS, reacciones quimicas entre el agregado, la pasta de cemento y asfalto

RECUBRIMIENTO, impide la adherencia entre el agregado, la pasta de cemento y asfalto

IMPUREZAS, que interfieren el proceso de hidratación del cemento y adherencia con el asfalto

Hugo León Arenas Lozano

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CONTENIDO APROXIMADO DE MATERIA ORGANICA EN ARENAS USADAS EN LA PREPARACION DE MORTEROS O CONCRETOS

PROCEDIMIENTO 1 Se coloca arena en el frasco hasta completar un volumen aproximado de 130 ml. 2 Se añade la solución de hidróxido de sodio, hasta que el volumen total de arena y líquido, después de agitado, sea igual a 200 ml aproximadamente. 3 Se tapa el frasco, se agita vigorosamente y se deja reposar por 24 horas. Hugo León Arenas Lozano

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Diapositiva 9

Cuarteo

Hugo León Arenas Lozano

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Colocación de arena en el frasco hasta completar un volumen aproximado de 130 ml.

Hugo León Arenas Lozano

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Se tapa el frasco, se agita vigorosamente

Se añade la solución de hidróxido de sodio, hasta que el volumen total de arena y líquido, después de agitado, sea igual a 200 ml aproximadamente. Hugo León Arenas Lozano

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CONTENIDO APROXIMADO DE MATERIA ORGANICA EN ARENAS USADAS EN LA PREPARACION DE MORTEROS O CONCRETOS se deja reposar por 24 horas

se compara la solución patrón con el del líquido que sobrenada en la solución que contiene la arena

Hugo León Arenas Lozano

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CONTENIDO APROXIMADO DE MATERIA ORGANICA EN ARENAS USADAS EN LA PREPARACION DE MORTEROS O CONCRETOS

se compara la solución patrón con el del líquido que sobrenada en la solución que contiene la arena

Hugo León Arenas Lozano

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Impurezas Orgánicas en Agregado Fino

Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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CONTENIDO DE MATERIA ORGANICA EN ARENAS PARA CONCRETO O MORTERO INTERPRETACIÓN DE LOS RESULTADOS:

Se considera que la arena contiene componentes orgánicos posiblemente perjudiciales, cuando el color que sobrenada por encima de la muestra de ensayo, es más oscuro que el color normal de referencia. En tal caso, se deben efectuar ensayos complementarios, antes de aprobar la arena para su utilización en la fabricación de concreto hidráulico.

Hugo León Arenas Lozano

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LAVADO DE LA ARENA

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA USO Y SIGNIFICADO • Este ensayo produce como resultado un valor empírico de la cantidad relativa de finos y material arcilloso presente en la muestra de suelo o agregado fino. • Puede especificarse un valor mínimo del equivalente de arena, para limitar la cantidad permisible de finos arcillosos en un agregado.

• Este método de ensayo permite determinar rápidamente, en el campo, variaciones de calidad de los materiales que se estén produciendo o utilizando.

Hugo León Arenas Lozano

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Diapositiva 20

Equivalente de Arena - Finos Plásticos en Agregados INV E-133 ASTM D-2419 AASHTO T-176 Hugo León Arenas Lozano

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Equivalente de Arena  Aplicación: Material pasa Tamiz No.40.  Objeto: Determinar la presencia de materiales arcillosos en agregados  Significado: Valor empírico de cantidad de finos arcillosos

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA

Hugo León Arenas Lozano

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Equivalente de Arena

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA Botella con solución

Tubo de irrigación

Viga de medición

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA

Marca en la viga medición

Frontera mat. suspendido Frontera capa arena

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA

Equipo

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA

Preparación solución floculante

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA Preparación del volumen de agregado fino

Adición de arena Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA

Mezcla del agregado fino y el material floculante

Sedimentación

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA Marca en la viga medición

Frontera mat. suspendido Frontera capa arena

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA

Mezcla del agregado fino y el material floculante

Sedimentación

Hugo León Arenas Lozano

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Equivalente de Arena

Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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*

EQUIVALENTE DE ARENA - Usado para estimar la proporción relativa entre arena y finos plásticos

EA =

Lectura Arena Lectura Arcilla

*100

Lectura Arcilla Lectura Arena

Solución Floculante

Arcilla suspendida Agregado sedimentado

Hugo León Arenas Lozano

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EQUIVALENTE DE ARENA

Universidad del Cauca Facultad de Ingeniería Civil Laboratorio de Materiales, Suelos y Pavimentos

EQUIIVALENTE DE ARENA

OBRA

:

FUENTE

Formato de calculo

EVALUACION DE CRUDOS PESADOS

DESCRIPCION

:

:

ARENA DE TRITURACION

MUESTRA N°

PURACE

FECHA

E N S A Y O

N°

:

: 23 DE MARZO DE 2002

1

2

3

Lectura del nivel de arena

LS

3,3

3,5

3,6

Lectura del nivel de arcilla

LC

4,3

4,2

4,6

77

83

78

Equiivalente de Arena

=

LS LC

*

100

PROMEDIO

79

Condiiciones de la arena para el ensayo : Humeda

Seca al aire

X

Seca al horno

Hugo León Arenas Lozano

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Terrones de Arcilla y Partículas Deleznables INV - 211 ASTM C-142 AASHTO T-112 Hugo León Arenas Lozano

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TERRONES DE ARCILLA Y PARTÍCULAS DELEZNABLES

 Aplicación: Agregado completo Retenido Tamiz No. 200 (0.075mm)  Objeto: Determinar contenido de partículas indeseables  Significado: Fundamental para aceptación agregados

Hugo León Arenas Lozano

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TERRONES DE ARCILLA Y PARTÍCULAS DELEZNABLES

 Aplicación: Agregado completo Retenido Tamiz No. 200 (0.075mm)  Objeto: Determinar contenido de partículas indeseables  Significado: Fundamental para aceptación agregados

Hugo León Arenas Lozano

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INMERSIÓN DE LA MUESTRA

Hugo León Arenas Lozano

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ROTURA DE PARTÍCULAS

Hugo León Arenas Lozano

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CANTIDAD DE PARTÍCULAS LIVIANAS INV E-221 ASTM C-123

Hugo León Arenas Lozano

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PARTÍCULAS LIVIANAS  Aplicación: Todo el Agregado  Objeto: Determinar contenido de partículas livianas por flotación en líquido espeso.

Hugo León Arenas Lozano

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Partículas Livianas

Hugo León Arenas Lozano

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LIMPIEZA SUPERFICIAL DE LAS PARTÍCULAS DE AGREGADO GRUESO INV E-267, NTC-78

Hugo León Arenas Lozano

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LIMPIEZA SUPERFICIAL DE LAS PARTÍCULAS DE AGREGADO GRUESO  Aplicación: Agregado grueso (>4.75mm)  Objeto: Separar partículas menores de 0.5mm (tamiz No. 35), mezcladas o adheridas  Significado: Limpieza Agregado

Hugo León Arenas Lozano

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PRUEBA DE AZUL DE METILENO INV E-235

Hugo León Arenas Lozano

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PRUEBA DE AZUL DE METILENO  Aplicación: Material pasa Tamiz No.200.  Objeto: Determinar la presencia de materiales arcillosos en agregados  Significado: Prueba de actividad superficial y físico-química de finos Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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AZUL DE METILENO Se fundamenta en la adición de pequeñas dosis de disolución de azul de metileno a una suspensión de la muestra de ensayo en agua, comprobando la absorción de colorante por parte de la muestra y realizando una prueba de coloración sobre papel de filtro.

Hugo León Arenas Lozano

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Indice de azul de metileno

Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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LÍMITE LÍQUIDO INV E-125

Hugo León Arenas Lozano

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LÍMITE LÍQUIDO  Aplicación: Agregado pasa Tamiz No. 40 (0.425mm)  Objeto: Límite entre estado plástico y líquido

Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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Hugo León Arenas Lozano

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LIMITE DE CONTRACCION

Hugo León Arenas Lozano

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Límite Líquido

Hugo León Arenas Lozano

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LÍMITE PLÁSTICO ÍNDICE DE PLASTICIDAD INV E-126

Hugo León Arenas Lozano

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LÍMITE PLÁSTICO, LP  Aplicación: Agregado pasa Tamiz No. 40 (0.425mm)  Objeto: Límite entre estado plástico y sólido  Índice de Plasticidad= Límite Líquido - Límite Plástico

Hugo León Arenas Lozano

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Límite Plástico

Hugo León Arenas Lozano

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