Digital point load tester (Rock strength index)
STANDARD: ASTM D5731
Used to determine the strength values of a rock specimen both in the field
and in the laboratory.
It consists of a load frame for applying loads up to 55 KN, on which a
manual hydraulic jack is mounted. The instrument accepts core specimens
up to 4” (101,6 mm) diameter which are loaded by two coneshaped points.
A graduated scale indicates the distance between the conical points.
The applied load is measured by a high precision electric load cell with a
digital display unit range 0-56kN proving:
– 65.000 divisions
– 0,001 kN resolution
– Linearity: 0,05%
– Hysteresis: 0,03%
– Repeatability: 0,02%
The strength index (IS) is got by the formula P : D2 where P
is the strength and D the space between the two conical
points. Supplied complete with wooden carrying case,
Dimensions: 400x530x720 mm.
Weight: 25 kg
A125-02 Lower plate and upper plate with seat ball to modify the Point Load Tester into a port- able compression tester
(see section “C” concrete, mod. C094) pag. 249
SPARE-PART: A125-01 Set of two hardened conical points