By S.L. Crouch, A. M. Starfield
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The whole assembly is mounted on a drill press with a 5 hp drive unit 23 Copyright © 2012 Society for Mining, Metallurgy, and Exploration, Inc. Figure 1. Schematics and pictures of the cylindrical chamber (b) (a) (c) Figure 2. (a) Penn State Soil Abrasion Testing machine (b) propeller and covers and (c) mounting system of the cover on the propeller blades using two bolts (Figure 2a). The drill press allows for various rpm settings. The propeller has three triangular blades each with the radius of 6 in that are welded in a 120 degree pattern.
Abrasivity testing for rock and soils. Tunnels & Tunneling International 47–49. 29 Copyright © 2012 Society for Mining, Metallurgy, and Exploration, Inc. , 2010. Tunneling on Brightwater West. Proceedings North American Tunneling Conference, Portland, Oregon, June 2010. , 2011. Cutterhead Maintenance for EPB Tunnel Boring Machines. Proceedings Rapid Excavation and Tunneling Conference, San Francisco, CA, June 2011. , 2009. Planning and Preparation for Tunneling at Brightwater West. Proceedings Rapid Excavation and Tunneling Conference, Las Vegas, Nevada, June 2009.
2-in. cubes can also be poured and screed with more accuracy than cylinders and do not require capping so testing can commence as soon as they are demoulded. Furthermore, they also provide dimensional consistency within the specimen test ages. The 2-in. mould is preferred for these reasons. It has also been noted that, though ASTM D4832 is designed for controlled low strength material (CLSM) testing in cylinders, it is designed for specimens cured at and beyond 7 days. The difference between curing and cured—plastic and elastic—is important.