grabens
Geotechnical
- Feb 11, 2004
- 30
I am working on a project in Fort Worth, Texas. I am looking for some guidence on how to treat the expansive soils for rigid pavement design. The soils are lean clays to fat clays.
PI ranges from 29 to 45
LL ranges from 46 to 62
Percent Swell ranges from 0 to 1.7%
Natural moistures are +/- 1% of the Plastic Limit
The proposed pavement section is 8 r/f concrete over 6 inches of compacted subgrade.
My question is do I need to moisture condition the subgrade soils. If so, to what depth should I over-excavate and moisture condition the soils. Should I lime stabilize the upper 6 to 12 inches of the subgrade? Do I need to put a base material under the concrete pavement? Or can I place the rigid pavement on top of the lime treated subgrade (if I even lime treat the subgrade)
I am looking for some help from professionals that practice in Texas or areas with expansive soils.
Thanks in advance for the reply.
PI ranges from 29 to 45
LL ranges from 46 to 62
Percent Swell ranges from 0 to 1.7%
Natural moistures are +/- 1% of the Plastic Limit
The proposed pavement section is 8 r/f concrete over 6 inches of compacted subgrade.
My question is do I need to moisture condition the subgrade soils. If so, to what depth should I over-excavate and moisture condition the soils. Should I lime stabilize the upper 6 to 12 inches of the subgrade? Do I need to put a base material under the concrete pavement? Or can I place the rigid pavement on top of the lime treated subgrade (if I even lime treat the subgrade)
I am looking for some help from professionals that practice in Texas or areas with expansive soils.
Thanks in advance for the reply.
