Resistance to degradation of aggregates smaller than 37.5 mm (1 ½ ") by means of the angel machine, Resistance to abrasion and impact wear of coarse aggregates less than 37.5 mm, using the angels machine, Resistance to the degradation of coarse aggregates of sizes greater than 19 mm (3/4 ") by abrasion and impact in the machine of the angels. According to INV-E-218, NTC 98, INV-E-219 Standard :NTC 98, INV-E-218, INV-E-219
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