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An instrument has been developed to measure the complex dynamic shear modulus of 45 mg bitumen samples over a frequency range of 2-200 Hz and over a continuously variable temperature range. A moving coil vibrator applies a torque to the sample and a capacitance transducer measures the resulting rotation. A resolved component indicator is used to measure the amplitudes and relative phase of the voltages representing torque and rotation. The components of the complex modulus are then calculated directly by the use of simple equations.

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