This is a video of rock flour, also known as Bull’s liver. Although it is fine grained, and is commonly confused to be clayey, it is essentially a silt, with particles of quartz grounded to small size by glaciers. The silt particles have practically no plasticity. In this video, a field engineer is playing with rock flour and by tamping it, is able to liquefy it.
by Allan J. Breitenbach, P.E., AB Engineering Inc. Littleton, Colorado, US Tel: 1/720-981-5244. fax...
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