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Tabla 2-1: Evolucin de la Resistencia del

Hormign Proyectado en funcin del tiempo

Figura 2-1: Evolucin de la Resistencia

Temprana del Hormign Proyectado

Procedimiento de ensayo Norma

EN 14488 (Aguja 3mm)

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30 mm Probeta Individual

20 mm en Promedio

Permeabilidad medida en mm de penetracin

Valores mx.segn NCh 2262 Of.97

Tabla 2-2: Requisitos Adicionales para Hormign Proyectado

(Sostenimiento primario y Revestimiento secundario)

Procedencia Nacional

Portland Puzolnico o Siderrgico

Grado alta resistencia (NCh 148)

Calor hidratacin mx. a 7 das: 85 cal/g (Langavant)

2.6.1 - Requisitos Relevantes para cemento empleado de

mezclas de Hormign Proyectado

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MAC Metro J2

(MPa)

Mtodo

Ensayo

6 min 0,33

10 min 0,45

30 min 0,57

1 hr 0,93

2 hr 1,12 Pistola Hilti

12 hr 12,901 da 20,00

7 das 36,20

14 das 47,80

28 das 57,10

Aguja 3mm

Testigo

Hormign R28 (MPa)

Hormign Blanco 70,4

MAC Metro J2 57,1

Prdida Resistencia (%) 19

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MAC Metro J3

(MPa)

Mtodo

Ensayo

6 0,57

10 0,83

30 1,13

1 hrs 1,98

2 hrs 4,09 Pistola Hilti

12 hrs 16,55

1 da 20,00

7 das 36,60

14 das 51,40

28 das 61,70

Aguja 3mm

Testigo

Hormign R28 (MPa)

Hormign Blanco 91,3

MAC Metro J3 61,7

Prdida Resistencia (%) 32

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