Resilient Modulus Testing System (MRT)

The GCTS Resilient Modulus Testing System is based on the GCTS Cyclic Triaxial Device with closed-loop control of the axial load/displacement and confining pressure. The device complies with the requirements of AASHTO T 307-99, SHRP-P46, ASTM D3999-91, NCHRP 1-28 and ASTM D5311-92 specifications.

The GCTS Resilient Modulus Testing System is based on the GCTS Cyclic Triaxial Device with closed-loop control of the axial load/displacement and confining pressure. The device complies with the requirements of AASHTO T 307-99, SHRP-P46, ASTM D3999-91, NCHRP 1-28 and ASTM D5311-92 specifications.The GCTS triaxial cell includes electrical feed-through connectors to accommodate internal instrumentation as may be required by future specifications. GCTS is also committed to updating its control software whenever new specifications are published. The GCTS Resilient Modulus Testing System can also be used to perform other dynamic and static tests such as liquefaction, cyclic strength, Stress Path, Ko-Consolidation, as well as conventional UU, CU, and CD tests.

The GCTS Resilient Modulus software features built in AASTHO, SHRP and NCHRP test sequences, and the capability to specify user defined sequences. Contact stress is automatically adjusted according to the above procedures as selected. Available waveforms include haversine, sine, square and triangular, along with a user defined waveform selection. Optional peak & valley compensation ensures proper and quick matching of the load parameters. Real time displays of the prescribed versus actual dynamic load or the dynamic deformation measurements by each sensor are always present. Deformation ratio of the two sensors, Rv (to ensure that the two deformation sensors are in agreement) and Mr are also calculated in real time. During export, curve fitting is done to fit the results to models that predict Mr as a function of σm, σd, and CP (cell pressure).

An optional environmental chamber can be provided to test asphalt specimens in either Triaxial or Indirect Tension mode. Test temperatures from –15 °C (-30 °C with the use of a nitrogen tank) to +60 °C can be achieved with this option.

 

Geotechnical Consulting & Test Systems (GCTS), USA

Geotechnical Consulting & Test Systems (GCTS), USA

Geotechnical Consulting and Testing Systems (GCTS) provides advanced testing solutions for Research in Geotechnical & Pavement materials. GCTS also helps in design of laboratory and in-situ testing apparatus and software ranging from modification and adaptation of existing apparatus to the purchase of new closed-loop computer-controlled systems. The company manufactures a full line of computer-controlled testing systems with either pneumatic or hydraulic loaders. Each system comes with a versatile software package which provides test control, data acquisition, data reduction, and graphing in one easy to learn Graphical User Interface.

 

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