Resipod Geometric - Proceq Resipod Family Operating Instructions Manual

Calculation of the Bulk Resistivity
Resipod displays a number in kΩcm . The number obtained from the Resipod display should be
divided by 2πa (where "a" is the probe spacing, i .e . either 3 .8 cm or 5 .0 cm) . For a Resipod with
38mm probe spacing:
Cylinder size
4x8
The bulk resistivity ρ = K
Example
R = 52 kΩcm
cylinder
R (corrected) = 52 / 23 .88 = 2 .18 kΩ
cylinder
Bulk resistivity ρ = K
Bulk Resistivity in ResipodLink
ResipodLink offers the possibility to calculate K automatically and download it onto the Resipod
instrument, so that the display shows directly the correct value in kΩcm . See Chapter 9 .

5.2 Resipod Geometric

Resipod Geometric is supplied with a stand for mounting the Resipod and a variable spacing
probe that allows probe spacing to be varied between 40mm and 70mm . This allows it to accom-
modate larger aggregate sizes .
The ResipodLink software (Chapter 9) allows the user to enter the correct probe spacing and also
a geometric correction factor to give the correct resistivity reading directly on the instrument .
The geometric correction factor for cylinders is designed to comply with the latest research in-
tended to extend the current AASHTO surface resistivity method to other sample geometries .
In addition to this the user also has the possibility to enter a self-determined correction factor .
© 2017 Proceq SA
2πa A (cm2)
23 .88 81 .07
R , where K = A/L
x
cylinder
R = 2 .18 x 3 .99 = 8 .69 kΩcm
x
cylinder
L (cm) A/L (cm)
20 .32 3 .99
16