SOIL TREATMENTS TO IMPROVE SOIL QUALITY

Question 1

DRAINAGE

Answer 1

Used to increase the strength of soil

Question 2

FILL

Answer 2

Undesirable existing soil is removed from the site, and new fill (soil) brought in. The new fill must then be compacted.
- Controlled compaction requires moisture to lubricate the soil particles

Question 3

What do you look for in all soil types

Answer 3

Optimum relation between density and moisture content

Question 4

Proctor Test

Answer 4

Testing that determines the optimal moisture content at which a given soil achieves its maximum dry density. Fill is placed in lifts of 8” to 12”, each lift is compacted before the next is placed

Question 5

Sheepsfoot roller

Answer 5

A machine used to compact fill

Question 6

Densification of Soil

Answer 6

achieved throuhg onsite compaction, vibration, heavy weights, and piles filled with sand

Question 7

Surcharging

Answer 7

Pre-loading of the ground with fill to compact and settle the underlying soil before starting construction The added fill is then removed, leaving only the compacted original soil
(very expensive)

Question 8

Mixing

Answer 8

Instead of complete replacement of soil with fill a layer of sand or gravel is mixed into the existing soil