When and why would one use ASTM D4253 or D4254 for determining density? The specification I'm looking at lists these along with the ASTM D698 and I'm unfamiliar with 4253&4254. The required percent compaction is significantly reduced when testing based on 4253&4254 (i.e. 95 down to 70% for Type A material and 90 to 50% on Type B).
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