Rheometer torsion fixtures.

Rectangular torsion fixtures for Gemini and C-VOR rheometers are designed to accept a solid sample with a free length of 50 ram, width to 13 mm and thickness to 10 mm. The ability to measure on larger sample sizes is of particular use for samples containing small particles of aggregate, such as bituminous mixes where bulk property determination of the mix is of practical interest. The fixtures are designed for use in conjunction with the company's forced gas oven (ETC) and enable the characterization of dynamic properties, such as loss and storage moduli, over a wide temperature and frequency range. The temperature range can be extended downwards to -150[degrees]C when the liquid nitrogen cooling option is employed. Spring loaded and infinitely adjustable clamps are designed to make sample loading easy, without the need to select spacers or shims according to the sample thickness. Uniformity and reproducibility of clamping pressure are said to be ensured by the use of a pre-set torque driver to tighten the sample clamps. A particular feature of the design is the ability to fully load and accurately align the sample within the clamps remotely from the rheometer unit. (Bohlin Instruments)

Circle 105 on card