Manual Geogauge

GEOGAUGE

™

USER GUIDE
Model H-4140

Soil Stiffness / Modulus Gauge
(patent pending)

manufactured, sold and serviced by

Humboldt Mfg. Co.
7300 West Agatite Avenue Norridge, Illinois60706 U.S.A. Customer Service: Voice: 708/456-6300 Fax: 708/456-5412

GeoGauge User Guide Version 4.1 June, 2007

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Table of Contents
Page

1.0 1.1 1.2 1.3 2.0 3.0 4.0 5.0 6.0 7.0Introduction GeoGauge Benefits How The GeoGauge Works GeoGauge Applications Button (Keypad) Functions Technical Specification Display Messages Get Acquainted With The GeoGauge GeoGauge Seating Sequence OfOperations For A GeoGauge Stiffness/Modulus Measurement 8.0 Transit - Carrying Case 9.0 Replacing Batteries 10.0 Clock / Date Adjustment Appendix 1: Stiffness Based Compaction QC Method Appendix 2:Stiffness Based QC On A Stabilized Base Appendix 3: Stiffness Based QC On A Stabilized Subgrade Appendix 4: GeoGauge Verifier Mass Guide Appendix 5: GeoGauge Data Download Guide

3 3 4 5 6 7 8 10 11 1214 14 15

Copyright 1999, 2000 & 2007, Humboldt Mfg. Co., Norridge, IL. 60706, U.S.A. All rights reserved. Printed in U.S.A.

GeoGauge User Guide Version 4.1 June, 2007

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1.0 Introduction1.1 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 ofprepared soil and aggregate, lift stiffness and material modulus (Fig. 1). Compaction Quality Control (QC) of subgrades, bases and pavements based on modulus or stiffness, as enabled by the GeoGauge, willreduce 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 enablesreal 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...