Date of Award

4-2016

Degree Name

Master of Science

Department

Geosciences

First Advisor

Dr. Daniel P. Cassidy

Second Advisor

Dr. Duane R. Hampton

Third Advisor

Dr. David Barnes

Access Setting

Masters Thesis-Open Access

Abstract

Two environmental remediation technologies that lend themselves well to being combined in a single application are In Situ Chemical Oxidation (ISCO) using activated persulfate (PS), and In Situ Stabilization (ISS). Persulfate can be activated by increasing the pH to 10.5 and/or increasing temperatures to 30ºC. Many common ISS amendments increase temperature to 30°C and/or pH to 10.5 when in contact with soil water. Laboratory experiments were conducted with various soils to determine the ability of eight ISS amendments to activate persulfate. All eight ISS amendments activated persulfate. This work also showed that the relative contribution of heat vs. alkaline activation increased with CaO content of the ISS amendment. Portland cement (PC) was also isolated as an ISS amendment to determine the doses of PS required to be completely activated. Ten different doses completely activated PS within 2.5 hours of mixing. After allowing 28-day curing times in all ISS treated samples, two important ISS parameters were measured and compared to background (i.e., untreated) samples; (1) unconfined compressive strength (UCS), and (2) hydraulic conductivity (K). All ISS amendments increased UCS, along with decreasing K, even when combined with PS. In addition to these parameters, testing was done to determine the effect of various doses of water, PC, and PS on soil swell of two soils. Variation of amendment dose had little to no effect on final soil swell, or variation of soil/grout workability and viscosity.

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