Abstract
The deep cement mixing (DCM) method is one of the popular methods of ground-improvement techniques for enhancing the bearing capacity and reducing settlements of thick deposits of soft clay with high water content. High cement content, of the order of 10 % to 25 %, are often used in practice. To reduce the requirement of cement, an attempt is made in the present study to replace the cement partially with fly ash, as a fly ash–cement composite. Different percentages of Class F fly ash (10 %, 20 %, and 30 %) to Ennore marine clay with different proportions of cement (10 %, 15 %, and 20 %) were added and tested. The optimum clay water content at which maximum strength is achieved was determined for various mixes based on unconfined compressive strength tests. A detailed study showed that addition of 20 % Class F fly ash is effective in all combinations. The behavior of the composite under one-dimensional consolidation was also tested.
Issue Section:
Research Papers
References
1.
Miura
, N.
, Horpibulsuk
, S.
, and Nagaraj
, T. S.
, “Engineering Behavior of Cement Stabilized Clay at High Water Content
,” Soils Found.
, Vol. 41
, No. 5
, 2001
, pp. 33
–45
. https://doi.org/10.3208/sandf.41.5_332.
Sivapullaiah
, P. V.
, Prashanth
, J. P.
, Sridharan
, A.
, and Narayana
, B. V.
, “Reactive Silica and Strength of Fly Ashes
,” Geotech. Geol. Eng.
, Vol. 16
, 1998
, pp. 239
–250
. https://doi.org/10.1023/A:10088893262693.
Reyes
, A.
and Pando
, M.
, “Evaluation of CFBC Fly Ash for Improvement of Soft Clays
,” World of Coal Ash (WOCA)
, Covington, KY
, May 7–10, 2007
.4.
ASTM C618-08A
: Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete
, Annual Book of ASTM Standards
, ASTM International
, West Conshohocken, PA
, 2012
.5.
Kaniraj
, S. R.
and Havanagi
, V. G.
, “Compressive Strength of Cement Stabilized Fly Ash-Soil Mixtures
,” Cement Concrete Res.
, Vol. 29
, 1999
, pp. 673
–677
. https://doi.org/10.1016/S0008-8846(99)00018-66.
Uddin
, K.
, Balasubramaniam
, A. S.
, and Bergado
, D. T.
, “Engineering Behavior of Cement-Treated Bangkok Soft Clay
,” Geotech. Eng.
, Vol. 28
, No. 1
, 1997
, pp. 89
–121
.7.
Bruce
, D. A.
, “Practioner’s Guide to the Deep Mixing Method
,” Ground Improve.
, Vol. 5
, No. 3
, 2001
, pp. 95
–100
. https://doi.org/10.1680/grim.2001.5.3.958.
Lorenzo
, G. A.
, Bergado
, D. T.
, and Soralump
, S.
, “New and Economical Mixing Method of Cement Admixed Clay for DMM Application
,” Geotech. Testing J.
, Vol. 29
, No. 1
, 2006
, pp. 1
–10
.9.
Horpibulsuk
, S.
, Rachan
, R.
, and Raksachon
, Y.
, “Role of Fly Ash on Strength and Microstructure Development in Blended Cement Stabilized Silty Clay
,” Soils Found.
, Vol. 49
, No. 1
, 2009
, pp. 85
–98
. https://doi.org/10.3208/sandf.49.8510.
IS 1498
, 1987
, “Indian Standard Code of Practice—Classification and Identification of Soils for General Engineering Purposes
,” Bureau of Indian Standards
, New Delhi, India
.11.
ASTM D2487-10
: Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)
, Annual Book of ASTM Standards
, ASTM International
, West Conshohocken, PA
, 2011
.12.
Kolias
, S.
, Rigopoulou
, V. K.
, and Karahalios
, A.
, “Stabilisation of Clayey Soils with High Calcium Fly Ash and Cement
,” Cement Concrete Comp
, Vol. 27
, 2005
, pp. 301
–313
. https://doi.org/10.1016/j.cemconcomp.2004.02.01913.
Sridharan
, A.
and Prakash
, K.
, 2007
, Geotechnical Engineering Characterisation of Coal Ashes
, CBS Publishers & Distributors
, New Delhi, India
.14.
IS 2720, Part 5
, 1985
, “Indian Standard Code of Practice for Method of Test for Soils—Determination of Liquid and Plastic Limit
,” Bureau of Indian Standards
, New Delhi, India
.15.
Lorenzo
, G. A.
and Bergado
, D. T.
, “Fundamental Parameters of Cement-Admixed Clay—New Approach
,” J. Geotech. Geoenviron. Eng.
, Vol. 130
, No. 10
, 2004
, pp. 1042
–1050
. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:10(1042)16.
Bushra
, I.
and Robinson
, R. G.
, “Shear Strength Behaviour of Cement Treated Marine Clay at Optimum Total Clay Water Content
,” Int. J. Earth Sci. Eng.
, Vol. 3
, No. 2
, 2010
, pp. 59
–69
.17.
IS 2720, Part 10
, 1991
, “Indian Standard Code of Practice for Method of Test for Soils—Determination of Unconfined Compressive Strength
,” Bureau of Indian Standards
, New Delhi, India
.18.
ASTM D2166-06
: Standard Test Method for Unconfined Compressive Strength of Cohesive Soil
, Annual Book of ASTM Standards
, ASTM International
, West Conshohocken, PA
, 2007
.19.
Smith
, R. E.
and Wahls
, H. E.
, “Consolidation under Constant Rates of Strain
,” J. Soil Mech. Found. Div.
, Vol. 95
, No. 2
, 1969
, pp. 519
–539
.20.
Yin
, J. H.
and Lai
, C. K.
, “Strength and Stiffness of Hong Kong Marine Deposits Mixed With Cement
,” Geotech. Eng.
, Vol. 29
, No. 1
, 1998
, pp. 29
–44
.21.
Sridharan
, A.
, Abraham
, B. M.
, and Jose
, B. T.
, “Improved Technique for Estimation of Preconsolidation Pressure
,” Geotechnique
, Vol. 41
, No. 2
, 1991
, pp. 263
–268
. https://doi.org/10.1680/geot.1991.41.2.26322.
Kamruzzaman
, A. H. M.
, Chew
, S. H.
, and Lee
, F. H.
, “Structuration and Destructuration Behavior of Cement-Treated Singapore Marine Clay
,” J. Geotech. Geoenviron. Eng.
, Vol. 135
, No. 4
, 2009
, pp. 573
–589
. https://doi.org/10.1061/(ASCE)1090-0241(2009)135:4(573)23.
Liu
, M. D.
and Carter
, J. P.
, “Virgin Compression of Structured Soils
,” Geotechnique
, Vol. 49
, No. 1
, 1999
, pp. 43
–57
. https://doi.org/10.1680/geot.1999.49.1.4324.
CDIT
, The Deep Mixing Method—Principle, Design and Consideration
, Balkema
A. A.
, Leiden
, The Netherlands
, 2002
.
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