Cement-Treated Soil: Variation of UCS with Soil Type

Presented by: Emilie Lapointe

February 18th, 2012

Deep-Mixing Project: Lillooet, BC, Canada

March 2, 2012 2

Field Trial forLandslideRemediation;

Design Specs. of2 MPa @ t = 14 days;

Mix Design by contractor.

Approximate Location and Direction of Fountain SlideFraser River

Highway 99

Bench-Scale Testing to inform mix design required

Laboratory Mix Design Testing

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Reconstitution method

Water/Cement ratio

Soil Type

BST –Reconstitution Methods

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Saturated SpecimenUnsaturated Specimen

eg.:Lewsley and Fannin (2011)

eg.:CDIT (2002)Hodges et al. (2008)ASTM D1632-07

Reconstitution by Wet-Mixing (Saturated)

Lewsley and Fannin, ASTM G.T.J. (2011)

UCS Database:4 soils (sand:fines @ 25:75 90:10);1.3 < (w/c)f < 5.8;t = 7, 14, 28 and 56 days

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Saturated Specimens: UCS Data

Similar findings @ t =7, 14 and 56 days. March 2, 2012 6

Reproduced from Lewsley (2008)

Saturated Specimens: UCS Data

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New Data:

2 site soils (40S:60F 60S:40F);

1.3 < (w/c)f < 5.8;

t = 7, 14, 28 and 56 days.

Saturated Specimens: UCS Data

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qu appears mostly independent of soil type(for a mix of sand and non-plastic fines)

Reconstitution by Dry-Mixing (Unsaturated)

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Coastal DevelopmentInstitute of Technology [CDIT] (2002)

New Data:1 site soil(sand:fines @ 60:40);1.5 < (w/c)f < 5.3;t = 14 days.

Unsaturated Specimens: UCS Data

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qu appears independent of the reconstitution method

Comparison with the Work of Others

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UBC Study:6 soils in total;2 reconstitution methods.

Other Studies:3 additional soils;2 more different reconstitution methods.

Concluding Remarks

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Soil Type;

Reconstitution method;

Water/Cement ratio.

qu appears largely independent of the soil type;qu appears independent of the method of reconstitution;qu appears largely sensitive to (w/c)t < 3.

Thank You!

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Acknowledgments:Natural Sciences and Engineering Research Council of Canada, Industrial Post-Graduate Scholarship;

Golder Associates Ltd.