Evolution of Longitudinal Resistance Performance of Granular Ballast Track with Durable Dynamic Reciprocated Changes

Table 1

Physical and durable attributes of Class I ballast materials.

Parameters	Characteristics of test results	Recommendations by Standards China (2008)
Abrasion and impact resistance	Los Angeles abrasion, LAA (%)	18 < LAA < 27
	Standard aggregate impact toughness, IP (%)	95 < IP < 110
	Wearable rigidity index, K	18 < K < 27
Crushing resistance	Standard aggregate crushing value (%)	8 ≤ CA < 9
	Ballast aggregate crushing value (%)	19 ≤ CB < 22
Water permeability	Stone powder specimen compressive strength (MPa)	<0.4
Stability performance	Density (g/cm^3)	>2.55
Particle shape	Flakiness (%)	<20
	Angularity index (%)	<20