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7.1 Modulus of Elasticity (MOE), or MOE and Poisson's Ratio
Modulus of Elasticity (MOE) testing can be selected from the specimen type drop-down menu on the main screen
if optional equipment was factory-installed on the machine. Before you can start a MOE test, you must break
a companion specimen in standard compression mode to get the strength of the specimens. This strength is
then entered in the "Comp. Brk." field. Once a nonzero value is entered, the operator can proceed with setup
and testing. Again, the "Run" and "Jog" buttons will be disabled until the companion break strength is entered.
The remaining parameters to setup are:
• DIAM = specimen diameter
• Length = specimen length
• Weight = specimen weight
• Age = specimen age
• Ramp Rate = rate of stress applied
• Preload = amount of load to apply before starting controlled ramp rate
• Comp. Brk. = break strength of the companion specimen (discussed above)
• Cycles = number of load/unload cycles to run
• LVDT = select desired LVDT (unit can store calibrations for six unique LVDTs)
• Gauge Length = gauge length per compressometer setup (via the "Setup" button)
• Correction Factor = er/(er-eg), dimensional constant per ASTM C469 (via the "Setup" button)
During testing, you can either watch the normal display or select the "Show Graph" option to look at Load vs.
Time or Strain vs. Time. While the test is applying load, the system will show a positive ramp rate. When the
system is unloading, it will display a negative ramp rate.
Pressing the "Setup" button (next to LVDT) will allow the user to input the correction factor and gauge length.
If the machine is equipped with (optional) Poisson's ratio capability, you can perform Poisson's ratio testing by
selecting the checkbox. Be sure the correct LVDT is selected in the drop-down list.
An example Load vs. Time graph is shown during the test by pressing the "Show Graph" button.
By pressing the "Stress vs. Strain" button, you can look at the Stress vs. Strain graph.
Once the test completes, the MOE value is displayed.
8.0 MAINTENANCE
8.1 Checking and Maintaining the Fluid Level
• After locating the pump and motor assembly, find the plug on the top of the reservoir cover plate.
• Check the fluid level in the reservoir by removing the fill plug and inserting the dipstick in the reservoir. The
system is full when the fluid level measures 2in below the top of the reservoir when fully retracted. Overfilling
may cause performance issues as well as leaking, and/or damage to the pump, motor, or valve(s).
• When it is necessary to add fluid to the reservoir, remove the cap and fill it to the proper level with Dexron III
or VI ATF. The reservoir capacity is approximately 2 gallons.
8.2 Filling the Reservoir with Hydraulic Fluid
• On the back, top side of the reservoir, locate the plastic screw-in plug. This is the fill hole for hydraulic fluid.
Clean the area around the plug to remove all dust and grit before removing the screw-in plug. Any foreign
particles in the fluid could damage pump surfaces, resulting in loss of performance.
• Insert a clean funnel with a filter.
• Fill the reservoir with new Dexron III ATF to approximately 2in below the top plate of the reservoir. Do not
overfill as this can cause poor performance, leaking, and possible damage to the system.
• Replace the plug.
• Test the system. Sometimes multiple starts and stops are needed to prime the pump following service.
14
Automatic Concrete Compression Machine Manual
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