South Platte lithologies yield a combined Los Angeles degradation value of 40-44 pct, suitable for most aggregate applications. The main concern is whether flat, bladed particles that might be physically weak are abundant. Weak shapes are not abundant in South Platte gravels. Sphericity, the tendency toward equidimensional shape, can be calculated from axial ratios. 4-Roundness is the absence of angular corners.
Roundness is determined by visual comparison with standards.
South Platte gravel particles tend to be well-rounded, but we know of no problems affecting applications such as road base.