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TRIAXIAL TESTS ON ROCK SPECIMENS

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STANDARDS: EN 1926, EN 14580 | ASTM D7012 | ASTM D2664 | ASTM D3148 | ASTM D5407

MAIN FEATURES
Axial load and constant isotropic pressure,
from 5 to 6 Mpa.
Real time reading of:
– poisson value
– stress value
– max. or breaking value.
Specimen breaking between 5 and 10 minutes.

The triaxial test is made on a rock specimen placed into a container
(Hoek cell), closed into a latex membrane .
TRIAXIAL TESTS ON ROCK SPECIMENS
STANDARDS: EN 1926, EN 14580 | ASTM D7012 | ASTM D2664 | ASTM D3148 | ASTM D5407
The electric extensometers are directly
applied on the surface of the rock
specimen and they are used for the
automatic reading in real time of the
different parameters and find different
information such as:
– Radial deformation combined with the axial deformation to obtain
the Poisson value.
– Stress value in relation with the axial and
radial deformation.
– The maximum or breaking value.
– Tangent and secant Young’s modulus
measured on the axial deformation
curve.
– Maximum stress value in triaxial conditions.
Standards require that during the
compression test the load on the rock
specimen is applied in a continue
way in order to obtain the breaking of
the specimen within a time included
between 5 and 10 minutes, with a
constant increase of the load included
between 0.5 and 10 Mpa/second.

For this reason it is recommended the use of a compression load
frame with capacity of 1500, 2000 or 3000 kN (see concrete
sector) combined with the automatic servo-controlled system
“Servo-Plus Evolution”, model C104N, and with the automatic
system for the Elastic Modulus on rocks model A150N, that
includes the data acquisition and processing software.
The side pressure set by the user, is kept constant between ± 1%
using:

C104N LP
Automatic servo-controlled system “Servo-Plus Evolution” that
grants a setting of the pressure up to 70 Mpa.
ACCESSORY
C104-51 LP
DISCHARGE CIRCUIT UPGRADE FOR C104N LP
Suitable when rocks causing fast cell pressure increment are tested.
This circuit upgrades C104N LP to a more powerful lateral pressure
compensation.

HOEK CELLS FOR ROCK TRIAXIAL TESTS
The basic Hoek cell consists of the following parts:
Cell body complete with two screwed end caps and two self-sealing
couplings, two spherical seats and pistons, hardened and ground,
one specimen jacket.

MAIN FEATURES
Perfect with pressure up to 70 MPa.
Suitable for specimens from 30.10 to 54.74
Used to measure the strength of cylindrical
rock specimens which are subjected to triaxial
compression.

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