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Reinstatement – Compacting & Backfill

 

Results

#1. What class of Backfill is Graded Granular?

#2. What is the maximum compacted lift thickness for GSB 1?

#3. How many passes would be carried out when using a 56Kg Vibrotamper on 100mm of GSB 1?

#4. What is the weight of a percussive rammer?

#5. The class C material being stored on site for re-use becomes extremely wet, what class would it then become if a field ID test was carried out?

#6. If using a class B material in the backfill layer, what would be the minimum depth of the sub-base layer in a flexible carriageway?

#7. What would be the structural layer thickness tolerance if using an unbound material?

#8. What should be placed immediately on top of the fine fill layer surrounding a utility service?

#9. Why do you add a surcharge of material (approx. 25%) to each layer prior to compaction?

#10. What would be the overall depth of excavating the construction layers in a Type 4 Flexible Carriageway, if a Class B backfill had been used?

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