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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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Edad
( )
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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Edad
( )
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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