Geotechnical Testing Journal

ASTM INTERNATIONAL

Geotechnical Testing Journal s.

J. Abbey,' S. Ngambi,2 and E. Ganjian2

DOI: 10.1520/GT J20160138

Development of Strength Models for Prediction of Unconfined Compressive Strength of Cement/Byproduct Material Improved Soils

Development of Strength Models for Prediction of Unconfined Compressive Strength ...

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Volume 40, Issue 6 (November 2017)

Development of Strength Models for Prediction of Unconfined Compressive Strength of Cement/Byproduct Material Improved Soils (Received 20 June 2016; accepted 24 March 2017) Published Online: 2017 CODEN: GTJOAD Format

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Cite this document Suggested Citation Style _ ..ASTM Abbey, Sa;Ngambi, S., and Ganjian, E., "Development of Strength Models for Prediction of Unconfined Compressive Strength of Cement/Byproduct Material Improved Soils," Geotechnical Testing Journal, Vol. 40, No.6, 2017, pp. 928935, https://doLorg/10.1520/GTJ20160138. ISSN0149-6115 EMAIL CITATION

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Abstract This paper presents the possible inclusion of pulverized fuel ash (PFA)and ground granulated blast slag (GGBS)in cement deep soil mixing for enhancement of unconfined compressive strength (UCS)of weak soil materials for construction purposes. The main focus of this paper was to investigate the UCS of cement-, cement/PFA- and cement/PFA/GGBS-improvedsoils, and development of mathematical and graphical models for prediction of UCS for use in design and construction. Samples of cement, blends of cement and PFA, and cement/PFA/GGBSwere prepared using 5 %, 10 %, 15 %, and 20 % by weight of dry soil and tested for UCS after 7, 14, 28, and 56 days. A multiple regression analysis was conducted using the SPSScomputer program. The results showed that soil materials with lower plasticity show higher strength development compared to those of higher plasticity for cement improvement. The study has also revealed that

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Geotechnical Testing Journal

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J20160138

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S. J. Abbey,' S. Ngambi,2 and E. Ganjian2

Development of Strength Models for Prediction of Unconfined Compressive Strength of Cement/ Byproduct Material Improved Soils Reference Abbey, S. J., Ngambi, 5., and Ganjian, E., "Development of Strength Models for Prediction Compressive Strength of Cement/Byproduct

of Unconfined

Material Improved Soils," Geotechnical Testing Journal

https:!/doi.org/101520/GTJ20160138.

ISSN 0149-6115

ABSTRACT Manuscript

received June 20,

2016; accepted for publication March

24, 2017; published online

School of Energy,

Construction

and Environment.

Coventry

University, Coventry, CV1 SFB, United Kingdom

2

of pulverized fuel ash (PFA) and ground granulated

blast slag (GGBS) in cement deep soil mixing for enhancement of unconfined compressive strength (UCS) of weak soil materials for construction

xxxx xx, xxxx. 1

This paper presents the possible inclusion

(Corresponding

purposes. The main focus of this paper

was to investigate the UCS of cement-, cement/PFA- and cement/PFA/GGBS-improved development

of mathematical

soils, and

and graphical models for prediction of UCS for use in design and

construction. Samples of cement,

blends of cement and PFA, and cement/PFA/GGBS

were

author), e-mail: samjonax@yahoo.

prepared using 5 %, 10 %, 15 %, and 20 % by weight of dry soil and tested for UCS after 7, 14,28,

com

and 56 days. A multiple regression analysis was conducted using the SPSS computer program. The

School of Energy, Construction

results showed that soil materials with lower plasticity show higher strength development

and Environment, Coventry

compared to those of higher plasticity for cement improvement. The study has also revealed that

University,

the inclusion

Coventry, CV1 SFB,

United Kingdom

mixing,

of PFA and GGBS can cause a reduction in the amount of cement in deep soil

which can result to reduced cost and emission

construction.

The developed mathematical

of carbon dioxide (C02) during

and graphical models could give reliable predictions

of UCS for weak soil materials with initial UCS less than or equal to 25 kPa and for water to binder ratio of unity based on the observed agreement developed

multiple regression

between experimental

and predicted data. The

models have also been validated using different mixtures of 6 %,

8 %, 12 %, and 16 % of binders. Keywords weak soil, deep soil mixing, unconfined compressive strength, strength model, cement-improved cement/pulverized

soils,

fuel ash/cround granulated blast slag-improved soil, regression model

Introduction Soil improvement

becomes very necessary when the present state of a soil, in terms of its engineering

properties, fails to meet the proposed use of the site. Deep soil mixing techniques have been designed to address the problems associated with performance of weak engineering soils due to poor resistance of

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