Premise
Despite studies showing that the presence of clay in structural grout mixes can significantly decrease compressive strength the impact of clay seams on the strength in jet grouted columns has yet to be quantified. A substantial loss of strength may have important implications as to the safe scheduling of excavations when jet grouting is used for retaining walls and underpinning.
Goals
- Consider loss of compressive strength with increasing presence of clay in jet grouted mixes.
- Document the rate of strength gain in comparison to mixes without any clay.
Fig. 1. Jet Grouting Configurations of Single-, Double- and Triple-Rod Systems (Laefer, 1994)
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Method
- Cast 3" diameter cylinder of bench prepared mixes that emulate jet grouted samples in water/cement, cement/aggregate, and solid/liquid ratios reflective of industry performance.
- Introduce varying level of bentonite and test samples at days one through 7.
Sponsor
Federal Work-study
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