1057384 lapointe ppt.pdf
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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
March 2, 2012 3
Reconstitution method
Water/Cement ratio
Soil Type
BST –Reconstitution Methods
March 2, 2012 4
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
March 2, 2012 5
Saturated Specimens: UCS Data
Similar findings @ t =7, 14 and 56 days. March 2, 2012 6
Reproduced from Lewsley (2008)
Saturated Specimens: UCS Data
March 2, 2012 7
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
March 2, 2012 8
qu appears mostly independent of soil type(for a mix of sand and non-plastic fines)
Reconstitution by Dry-Mixing (Unsaturated)
March 2, 2012 9
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
March 2, 2012 10
qu appears independent of the reconstitution method
Comparison with the Work of Others
March 2, 2012 11
UBC Study:6 soils in total;2 reconstitution methods.
Other Studies:3 additional soils;2 more different reconstitution methods.
Concluding Remarks
March 2, 2012 12
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!
March 2, 2012 13
Acknowledgments:Natural Sciences and Engineering Research Council of Canada, Industrial Post-Graduate Scholarship;
Golder Associates Ltd.
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