The Genesis of ADMET MegaForce Automatic Loading System
Nearly all concrete testing machines are manually controlled. Operators continuously adjust a valve during testing to control the loading rate over 15 to 30 to 60 second intervals. Since many testing laboratories are paid by the number of cylinders tested, they are motivated to test quickly which can lead to errors and non-compliance with ASTM specifications. ASTM C39 Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens stipulates that the loading rate fall within 28 to 42 psi/sec (0.2 to 0.3MPa/sec). For normal strength concrete, the measured compressive strength will be 2-3% greater for cylinders tested 0.2MPa/sec faster than a second group at the slower rate. A 20% increase in measured compressive strength for high strength concrete is possible when loading rates exceed C39 limits.
Realizing the importance of performing tests within specified ASTM load rate limits, ADMET set out to eliminate the operator and developed an affordable automatically controlled concrete testing system that ensures proper loading rates are maintained throughout each test. The ADMET MegaForce Automatic Loading System was the result of our development efforts. Since its creation, the MegaForce system has been perfected over several iterations and subsequent years of development. Concrete testing machines require up to 10,000 psi of hydraulic pressure to obtain full machine force capacity. Commercially available automatic hydraulic control valves are only capable of operating up to 4,500 psi and are thus not used on these concrete testing machines.
MegaForce became another ADMET first in the concrete testing industry. MegaForce is affordable, can be installed on new or retrofitted to existing testing machines and most importantly ensures that all tests are performed according to ASTM specifications.