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A New Practical Method For Determining The LA Abrasion aggregate impact value bsi bs 812 112 1990c aggregate crushing value as 1997 bsi bs 812 110 1990b micro deval abrasion aashto tp 58 1999 astm d6928 2021 aenor une en 1097 1 2021 texas ball mill wet 2021 country roads board victoria test method 341 national association of australian state road