Is it possible to compact soil to 100% as per ASTM D698? 1

[tmgczb]

As the topic...

 

[MTNClimber]

Yes

 

[tmgczb]

For what types of subgrade is it required?

 

[dik]

Subgrade capable of taking the compaction, else more effort is required to compact the soil over.

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-Dik

 

[geotechguy1]

Yes. With modern compaction equipment you might easily find yourself staring at some 105% SPMDD's.

 

[BigH]

Usually very easy to obtain . . . much lower standard than for the modified test D1556 (or 1557)

 

[MTNClimber]

For what types of subgrade is it required?

You see 100% of D698 or 1557 typically for sensitive pavement structures, like an airport runway, or in areas where a structure will rely on passive earth pressures to resist lateral loads.

 

[SirAl]

Not terribly difficult to achieve at moisture contents close to optimum moisture.