Armourstone is a generic term for broken stone with stone masses between 100 and 10,000 kilograms (220 and 22,050 lb) (very coarse aggregate) that is suitable for use in hydraulic engineering. Dimensions and characteristics for armourstone are laid down in European Standard EN13383.[1] In the United States, there are a number of different standards and publications setting out different methodologies for classifying armourstone, ranging from weight-based classifications to gradation curves and size-based classifications.[2]
- ^ EN 13383 Armourstone. various national standardisation institutes (like BSI, NNI, DIN). 2002. p. 73.
- ^ Lagasse, P. F.; Clopper, P. E.; Zevenbergen, L. W.; Ruff, J. F. (2006). Riprap design criteria, recommended specifications, and quality control. NCHRP Report. Washington(D.C.): National Academy Press. ISBN 978-0-309-09866-3.