The GCTS Rock Abrasiveness Apparatus (RAA-100) is used for the measurement of rock abrasiveness under the standards specified by the CERCHAR test. The test consists of measuring the wear flat on the standard steel indenter with 200 kg/mm2 hardness loaded with 70 N force after it has scratched 10 mm distance on the rock surface. The indenter is examined under a microscope and the amount of wear is correlated to the CERCHAR Abrasiveness Index (CAI).
The RAA-100 features a precision slide for smooth movement of the rock specimen over the required scratch distance. It also comes with a graduated knob for accurate scratch distance control with 0.01 mm precision. The slide movement is controlled with a precision threaded acme rod with 1 mm pitch (1 mm horizontal movement per knob revolution).
Included in the RAA-100 package are one hundred (100) sharp steel indenters with 200 kg/mm2 hardness and 90° cone angle, rock holding vise, and a load frame made of anodized aluminum and stainless steel.
GCTS also offers a digital microscope and software to automatically measure the wear on the indenter and calculate the CAI.