Penetrologger CBR

The Penetrologger CBR is the latest addition to our Penetrologger family. It is a sophisticated penetrometer to determine a soil’s resistance to penetration. Using the standard California Bearing Ratio (CBR) cone to determine the thickness of soils and aggregates the Penetrologger CBR is ideal in the design of roads and airfields. Because it measures the pressure required to achieve an equal penetration against a standard.

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Benefits

It directly measures the mechanical strength of soil, natural ground, subgrades and basecourses using a standard California Bearing Ratio (CBR) cone. CBR is the basis for determining the thickness of soil and aggregate layers used in the design of roads and airfields. The test is performed by measuring the pressure required to achieve an equal penetration on a standard crushed rock material.

Penetrologger CBR

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+44 (0) 1428 661 660 Call Van Walt
+64 (0)3443 5326

Penetrologger CBR Equipment Options:

Applications

Evaluation of the mechanical strength of:

Road subgrades and basecourses
Landing strips
Pavement bearing

User Groups:

Geotechnical engineers
Military
Civil

Specifications

ENVIRONMENTAL

Temperature

-10 to +70°

Relative humidity

0…100% RH

Temperature shock

50°C

PHYSICAL

Dimension bag

30 x 25 x 15 cm

Total weight

5.5kg

IP classification

IP 54

CONE CBR STANDARD

Diameter

0.5 inch (1.27cm)

Angle

30°

Surface

0.2 inch² (1.27cm²)

Penetration depth

0 – 70cm

Resolution

1cm

Penetration speed

1 – 5cm/sec

Force

0 – 15% CBR (0 – 700N)

Force resolution

0.1% CBR

Accuracy

2% (re-calibration when error > 5%)

GPS accuracy

2m CEP Circular Error Probable
3.5m SEP Spherical Error Probable (Egnos compensated)
CEP, 50% 24 Hours static, -130 dBm (type µBlox LEA-6H)

Display

LCD monochrome green / black

Background light

LED intensity and contrast adjustable

Power supply

Battery pack Lithium SEM52 8.4V or BH8AA 12V

Battery operational life

> 600 measurements

Memory

1500 penetration measurements

Leveling

Water level (libelle)

Soil moisture

Optional sensor available

MODUS MEASUREMENTS

Calculation CBR

Average value of depth range specified by user

Software language

English, German, French, Spanish, Dutch

The CBR test is described in ML CRD-C 654-95, ASTM Standards D1883-05 (for laboratory-prepared samples) and D4429 (for soils in-situ), and AASHTO T193. The correlation between field test and laboratory test is describes in TRRL-Report 901.