Humboldt H-4140 GeoGauge - Manual (Page 3)

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1.0: Introduction
1.1: GeoGauge
® Benefits
The Humboldt GeoGauge ® is a hand-portable instrument that provides a
simple, rapid and precise means of measuring in-place two key engineering and
mechanical properties of prepared soil and aggregate, lift stiffness and
material modulus.
Compaction Quality Control (QC) of subgrades, bases and pavements based
on modulus or stiffness, as enabled by the GeoGauge, will reduce compaction
costs by 30% and roadway maintenance by at least 50%.
The GeoGauge, unlike density gauges, can measure in-place the load bearing
characteristics of compacted materials. This enables real estimates of roadway
performance and provides the basis for reducing construction margins, lower
construction costs by at least 20%.
The GeoGauge can be used in-place to estimate CBR and Resilient Modulus or
estimate the results of plate load tests, laboratory R-Value, FWD or DCP with
more speed and simplicity and at a much lower cost.
The GeoGauge can be used to evaluate the material strength gained by
stabilization of any kind very soon after installation, allowing construction to
resume as soon as the material can support traffic loads while assuring ultimate
material strength.
The GeoGauge can enable construction methods that reduce roadway
maintenance by at least 50%.
• Asphalt & Concrete Pavement
• Full Depth Pavements
• Full Depth Roadway Reclamation
• Airport Runways & Infields
• Unpaved Roadways
• Structures Buried Under Roadways
The GeoGauge can be used to simply and rapidly build the quantitative basis
for implementing mechanistic-empirical roadway design by cataloging as-built
resilient modulus in a fraction of the time required for laboratory measurements.
The GeoGauge is intended to meet a need that has existed since quality
has been important to earthworks construction. This is the control of the
construction process via the same physical parameters that earthworks are
designed with. For example in highways:
• Lift Stiffness is used to assure the uniform & effective transfer of loads from
the pavement to the base, subbase & subgrade below and
• Material Modulus is used to assure that each material allows the highway
system to structurally perform as needed.