Expansive soil Remediation - Ionic Treatement


My project team is considering ionic chemical treatment to reduce shrink/swell behavior of expansive soil beneath an existing buildings. The subject building is a one-story CMU skilled nursing structure with a concrete slab-on-grade floor and shallow footings. The damage is likely caused by extreme drying/shrink during drought and from high sun exposure.

We completed our geotechnical engineering study and have lots of lab data, but no floor-level survey data yet. Dealing with "moderately" to "highly" expansive soil with a sell pressure of up to 2,800 psf, void ratio of 0.6 to 07, saturation percent is about 75 (now), and activity is about 0.6 to 0.7. I expect the depth of significant seasonal moisture content change is 7 feet.

I would appreciate any stories regarding success or pitfalls and comparison of your project to mine.

Soil Mechanics / Geotechnical Design Analysis Construction Shallow Foundations Ground Improvement

Asked 16/10/2015 20:39, updated: 14/03/2017 10:08
Palmahouse

2 Answers

Votes: 0

Sally Simpson

By ionic treatment, do you mean lime stabilization?


Votes: 0

Palmahouse

No, the ionic treatment I refer to is different than lime stabilization.  The ionic treament we are considering consists of intoducing a solution of water with a proprietary concentrated chemical that has similar effects as does lime treatment, and hopefully more effective.  Apparently, the solution causes isomorphic substitution to reduce negative charges within clay lattice particles and cation exchange to reduce negative charges at surfaces of clay particles (and subsequent potential for soil volume changes from moisture content changes).