Equivalente de Arenac

"

“UNIVERSIDAD ANDINA NESTOR CACERES VELASQUEZ”

FACULTAD DE INGENIERIA Y CIENCIAS PURAS ESCUELA PROFESIONAL DE INGENIERIA CIVIL SEDE JULIACA

ENSAYO DE EQUIVALENTE DE ARENA ENSAYO N° 4

GRUPO N° 2

DOCENTE TEORIA: MG. ALFREDO ALARCON ATAHUACHI DOCENTE DE PRACTICA: ING. EDWIN PARILLO ESCARSENA. INTEGRANTES: - AÑARI QUIÑONES, F. Ysabel

(21802111) (21802111)

- CAZORLA MACEDO, Irvin

(21302049) (21302049)

- SANTANDER MAMANI, Emily

(21002068) (21002068)

- AÑASCO YANCACHAJLLA, Alexis

(21802161) (21802161)

- GOMEZ VARGAS, Vladimiro

(21002047) (21002047)

- RAMOS MARIN, Percy Josimar

(25202028) (25202028)

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UNIVERSIDAD ANDINA “NESTOR CACERES VELASQUEZ”

FACULTAD DE INGENIERIAS Y CIENCIAS PURAS E. P. INGENIERIA CIVIL

1. INTRODUCCION. El presente informe tiene como finalidad explicar un procedimiento recomendado basado en las normas ASTM D 2419 y AASHTO T 176 y determinar así el porcentaje de equivalente de arena en una muestra de suelo que será utilizada para conformar el pavimento. Señalamos y explicamos los puntos más importantes según nuestro criterio. El ensayo “EQUIVALENTE DE ARENA” fue dirigido por el docente del curso

LABORATORIO DE DISEÑO DE PAVIMENTOS, quien nos proporcionó material que consistía en guías. EL material utilizado provenía de la “Cantera Taparachi ” debido a que esta

cantera abastece las diferentes obras que se realizan en Juliaca, principalmente la construcción de carreteras. Utilizamos probetas para depositar en ellas la solución stock y una fracción de la muestra, y agitarla con un agitador mecánico. Al terminar esta operación esperamos la decantación para luego medirlo. Tomamos los datos necesarios que se indican en el formato proporcionado por el docente y realizamos los cálculos necesarios para nuestra finalidad. Este ensayo es útil pasa determinar si la cantidad de material granular presente en el suelo a utilizar es admisible. Los cálculos y resultados los presentamos de forma clara para su mejor comprensión.  A continuación se da inicio al desarrollo del contenido ya mencionado con el propósito de reforzar r eforzar nuestros conocimientos. Hemos incluido recomendaciones, recomendaciones, conclusiones y anexos que se desprendieron del informe y del desarrollo del ensayo.

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UNIVERSIDAD ANDINA “NESTOR CACERES VELASQUEZ”

FACULTAD DE INGENIERIAS Y CIENCIAS PURAS E. P. INGENIERIA CIVIL

2. INDICE.

1.

................................................................................................................... ........................................................ 1 INTRODUCCION. ...........................................................

2.

.................................................................................................................................. ................................................................... 2 INDICE. ...............................................................

3.

............................................................................................................................ ....................................................... 3 OBJETIVOS. .....................................................................

4.

MARCO TEORICO. ................................................................................................................. 3

5.

........................................................................................................................ 5 MATERIALES. .........................................................................................................................

6.

EQUIPOS Y HERRAMIENTAS. HERRAMIENTAS. ................................................................................................ 5

7.

UBICASION DEL ENSAYO. ........................................................ ..................................................................................................... ............................................. 8

8.

PROCEDIMIENTO RECOMENDADO. RECOMENDADO. ..................................................................................... 8

9.

PRESENTACION DE DATOS Y MEMORIA DE CÁLCULO....................................................... 15

10.

................................................................... 17 CALCULO VOLUMEN DE LA CÁPSULA (VC):  ....................................................................

11.

CONCLUSIONES. .............................................................................................................. ............................................................................................................. 19

12.

..................................................................................................... ........................................... 19 RECOMENDACIONES. ..........................................................

13.

BIBLIOGRAFIA. ................................................................................................................ 20

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UNIVERSIDAD ANDINA “NESTOR CACERES VELASQUEZ”

FACULTAD DE INGENIERIAS Y CIENCIAS PURAS E. P. INGENIERIA CIVIL

3. OBJETIVOS. OBJETIVOS PRINCIPALES: 



Determinar el porcentaje de equivalente de arena en una muestra de cantera Taparachi. Determinar si el suelo que se va emplear en las capas que conformaran el pavimento tienen la calidad que se requiere.

OBJETIVOS ESPECIFICOS: 

Presentar a los estudiantes estudiante s conozcan el procedimiento a seguir para la determinación del porcentaje “Equivalente de Arena”.



Dar a conocer al estudiante en qué casos utilizar el ensayo “Equivalente de Arena”. de  Arena”.

4. MARCO TEORICO. ENSAYO EQUIVALENTE DE ARENA: El ensayo de equivalencia de arena es empleado para determinar en campo las variaciones de calidad de los agregados empleados durante la producción y colocación.  A cierto volumen de suelo se le agrega una cantidad de SOLUCION STOCK (solución floculante) mezclándolos mezclándolos en una probeta graduada y agitándolos agitándolos para que las partículas de arena pierdan la cobertura arcillosa. La muestra es entonces “irrigada” adicionando una cantidad de solución stock, esto para que la arcilla se quede suspendida encima de la arena. Después de un tiempo de sedimentación se miden las alturas de la arcilla floculada y de la arena en el cilindro. El “equivalente de arena” es la relación

entre la altura de arena y la altura de arcilla, expresada en porcentaje.

MATERIALES UTILIZADOS: -

Probeta cilíndrica. Tuvo lavador o irrigador. Indicador de lectura de arena.

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SOLUCION STOCK.- Se denomina solución stock a composiciones concentradas de nutrientes las cuales están formuladas por sales minerales que se emplean en un medio particular. Para este ensayo la solución stock que utilizamos está compuesta de cloruro de calcio y tiene la propiedad de decantar los materiales (arene y arcilla).

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5. MATERIALES. GRAVA: la muestra fue obtenida de la cantera TAPARACHI, para el ensayo tiene que ser tamizada con el tamiz N°4.

6. EQUIPOS Y HERRAMIENTAS. 

Probetas Cilíndricas: Para depositar la solución stock y la muestra.

Tapones



Capsulas: Utilizado para medir la muestra que se

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

Pisón Metálico: Este instrumento sirve para medir las alturas o el nivel de arena y arcilla presentes en la probeta. Pie

Indicador lectura de arena Barra



Tamiz N°4: Se utiliza para tamizar el material debido a que para este ensayo se requiere material fino.

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

Agitador Mecánico: Utilizado para mezclar la muestra con la solución stock, ella consta de un tablero de control para programar los ciclos en el tiempo requerido, un interruptor para encender y dos piezas de metal para sostener las probetas. Piezas metálicas para sostener las robetas

Interruptor Tablero de control



Solución Stock: Tipo cloruro de calcio se utiliza para separar la arena de la arcilla.se prepara de la siguiente forma: Solución STOCK

Tubo Irrigador

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7. UBICASION DEL ENSAYO. El ensayo se realizó en la ciudad universitaria universitari a UANCV en las instalaciones del Laboratorio de suelos. Imagen N°1: Ubicación del lugar donde se realizó el ensayo

Fuente: GOOGLE Earth.

8. PROCEDIMIENTO RECOMENDADO. NORMA: 

AASHTO T 176



ASTM D 2419

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8. 1 PROCEDIMIENTO Para el ensayo de cono de arena el procedimiento recomendado es el siguiente: 

Foto N°1: abrimos el estuche que contiene las probetas, la capsula, el pisón, etc.

Fuente: propia



Foto N°2: N°2: La muestra que utilizaremos utilizaremos tiene que pasar pasar la malla N°4.

Fuente: propia

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Foto N°3: Colocamos la primera capa de muestra y la compactamos con 8 golpes del martillo en caída libre.

Fuente: propia. 

Foto N°4: Colocamos la segunda capa y la compactamos compactam os con 8 golpes del martillo en caída libre.

Fuente: propia.



Foto N°5: Colocamos la tercera capa y la compactamos con 9 golpes del martillo en caída libre.

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Fuente: propia

EQUIVALENTE DE ARENA 

Foto N°7: Introducimos 4” de solución STOCK en ambas probetas.

4” 4”

Fuente: propia

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Foto N°9: Ponemos la muestra en la capsula y lo enrasamos con ayuda del martillo.

Fuente: propia 

Foto N°10: N°10: Para el siguiente siguiente paso improvisamos improvisamos un embudo para evitar evitar pérdidas pérdidas de muestra. Vertemos la muestra en la probeta. Este paso se realiza en ambas probetas.

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Fuente: propia Nota: debemos tomar nota de la hora de entrada y salida de saturación. 

Foto N° 12: Después Después de transcurridos los 10 minutos ponemos ponemos la probeta probeta en el agitador mecánico.

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Foto N°14: Ahora retiramos la probeta y la destapamos. Introducimos el tubo irrigador en la probeta, aflojamos la llave para que ingrese la solución STOCK. En la primera probeta se llegó a una altura de 10” y en la segunda probeta se llegó a una altura de 8.3”.

Fuente: propia 

Foto N°15: Colocamos las probetas en una superficie plana y las dejamos en reposo durante 20 minutos y esperamos que la arena se separe del suelo fino.

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UNIVERSIDAD ANDINA “NESTOR CACERES VELASQUEZ”

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Foto N°16: introducimos introducimo s con cuidado el pisón en la probeta y medimos la altura de la arena. Este paso al igual que el anterior se realiza en ambas probetas.

PRIMER ENSAYO

SEGUNDO ENSAYO

ALTURA TOTAL 8.3” ALTURA TOTAL 10”

ARENA 3.1”

ARENA 3.2”

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

Cálculo de nivel de suelo fino: Para explicar este cálculo utilizaremos gráficos elaborados por los integrantes del grupo.

9. 1 PRIMER ENSAYO Como vemos el nivel total en la probeta es de 10 pulgadas y el nivel de la arena es de 3.1 pulgadas para el calculo del nivel de suelo fino realizamos una resta como se muestra acontinuacion. h= NIVEL TOTAL - H Donde : h = nivel de suelo fino.

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SEGUNDO ENSAYO EA =

3.20(pulg) 5.10(pulg)

∗ 100

EA= 62.75 ≈ 63 % 

Calculo del equivalente de Arena (EA.):

 =

  ∗  

Donde: H = Nivel de arena (pulgadas). h =Nivel de suelo fino (pulgadas).

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ENSAYO DE EQUIVALENTE DE ARENA PROYECTO: CONSTRUCCION DE CARRETERA E.P. EDUCACION- E.P. ING CIVIL SOLICITANTE: UANCV UBICACIÓN: UNIVERSIDAD ANDINA NESTOR CACERES VELASQUEZ

FECHA DE ENSAYO: 22/02/2018

SOLICITANTE: CONSORCIO AKATSUKI

EQUIVALENTE DE ARENA EQUIVALENTE DE ARENA DESCRIPCION A B C D E F

HORA DE ENTRADA A SATURACION HORA DE SALIDA DE SATURACION HORA DE ENTRADA A DECANTACION HORA DE SALIDA DE DECANTACION NIVEL DE SUELO FINO (PULG) NIVEL DE ARENA (PULG)

1 03:19 03:29 03:34 03:54 6.90 3.10

2 03:22 03:32 03:38 03:58 5.10 3.20

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11.CONCLUSIONES. 11.CONCLUSIONES. 



De acuerdo a nuestros resultados podemos ver que el valor de EA. obtenido es de 54% y cumple para las condiciones de nuestra ciudad Juliaca  Alturas >3000m.s.n.m. >3000m.s.n.m.

EA > 50%

 Alturas 3000 m3

2

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13.BIBLIOGRAFIA. 13.BIBLIOGRAFIA.   

http://www.unalmed.edu.co/~geotecni/GG-17.pdf  http://www3.ucn.cl/FacultadesInstitutos/laboratorio/mecanica6.htm http://www.lms.uni.edu.pe/Proctor%20Modificado.pdf