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Utest Material Testing Equipment

FULLY-AUTOMATED RESILIENT MODULUS UNIT

Product Code

LoadTrac II-RM

Geocomp's LoadTrac II Resilient Modulus unit fully automates resilient modulus tests on base/subbase/subgrade materials. The LoadTrac II meets or exceeds all specifications for Resilient Modulus Testing of Base/Subbase/Subgrade Materials by AASHTO T-294/T-307 and SHRP Protocol P46. It minimizes man time during testing and offers a versatile platform for performing additional geotechnical tests.

User Features and Benefits

ADDITIONAL TESTING CAPABILITIES

Geocomp's load frame does more than just Resilient Modulus testing. With software and accessories, the following tests can also be done:

  • California Bearing Ratio
  • Compression Testing of Weak Rocks and Cement Mixtures
  • Constant Rate of Strain Consolidation Testing
  • Cyclic Triaxial Testing
  • Incremental consolidation
  • Triaxial Testing
  • Unconfined Compression.

FULLY AUTOMATED MINIMUM INTERVENTION ON YOUR PART

The LoadTrac II performs resilient modulus tests from beginning to end according to the latest AASHTO standards without human intervention.

APPLIES AN ACCURATE LOAD THROUGHOUT TESTING

Resilient modulus testing is a complicated test in which the stiffness of the sample changes with loading. Since the performance of cyclic loading systems depends on the stiffness of the sample, most systems fail to apply the correct load throughout the test. Our system uses real-time adjustment of a PID controller to adjust the system control parameters as the stiffness of the specimen changes. This feature permits our system to apply an accurate load from the beginning to the end of the test. Our system meets the rigid AASHTO specs for precision on loading to a haversine shape.

OPERATES IN A WINDOWS ENVIRONMENT

Training time is short, as most people are familiar with the Windows operat- ing environment. Users can configure a wide variety of graphical screens to display the test results including tabular and graphical display of channel values with time, graphical display of stresses, strains, displacements and resilient modulus values.

TEST DATA...THE WAY YOU WANT IT

Our system generates data in a variety of formats, so users get the most use out of the data. Options include:

 

  • A complete final test report with all appropriate calculations on the data and constitutive relationships based on Publication
  • No. FHWA-RD-97-083
  • A text file of raw data and a text file of data in engineering units. Either can be easily loaded into a spreadsheet for further data analysis. Complete reporting software is included. This software creates reduced test results that are printed in tabular and graphical form instantly after testing.  Results are available in any set of units, regardless of which set of units the test was run.  Geocomp's Resilient Modulus Testing System is efficient and reliable. Many details of the test cell,  instrumentation and loading system have been optimized thorough inhouse testing on a wide variety of materials utilizing over fifteen years of R&D experience. We continually improve our systems based on new technology and the experiences of our customers.
Technical Specifications

Cell

Pressure

Automatically applied, maintained and incremented

with electro-pneumatic air pressure regulator

Type Of Cyclic

Loading

Haversine pulse

Cyclic Rate

0.1 sec per pulse, 1 pulse per second and any slower

values given by user

 

 

 

 

Cyclic Loading

• High performance custom linear actuator

• 2.8kW peak, low inertia servo-drive system for fast

response time.

• High resolution feedback system for pre- cise and

accurate control of load and speed.

• 22 kN (5000lbs force) continuous load at speeds in

excess of 200 mm (8") /sec

• Self-contained and maintenance free

• Single Phase 208 VAC/60Hz (US) / 220

VAC/50Hz (international)

Options To End

Test

Maximum number of cycles

Maximum strain

Reporting

Options

• Shear stress versus pulse number

• Axial strain versus pulse number

• Resilient Modulus versus pulse number

• Resilient Modulus versus deviator stress

• Resilient Modulus versus confining stress

• Automatic or user specified scaling on any of above

plots

• Plotting to monitor, printer, plotter, or file

Test Cell

Modified triaxial cell with sample preparation

accessories

Unit Systems

U.S., English, metric and SI changeable at any time

before, during and after test

Sample

Diameter

70, 100, and 150 mm (2.8/4/6 inches) Custom sizes by

special order

Transducers

Force: 2, 5,10 kN (500, 1000, 2500 lbf.)

Displacement: 0.5 inch range, +25.4 mm (+1.00 in.)

Cell pressure: 0-500 kPa (0-70 psi)

System

Requirements

System is delivered complete to perform tests, store

data, reduce data and report the test results. System

will be calibrated and ready to begin testing immediately

after installation.

Documentation

Full documentation and user's manuals are provided.

HELP screens are available at every point in all software