Development of Strength Models for Prediction of Unconfined Compressive Strength of Cement/by-Product Material Improved Soils

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Abstract

This paper presents the possible inclusion of pulverised fuel ash (PFA) and ground granulated blast slag (GGBS) in cement deep soil mixing for enhancement of unconfined compressive strength of weak soil materials for construction purposes. The main focus of this paper was to investigate the unconfined compressive strength (UCS) of cement, Cement/PFA and Cement/PFA/GGBS improved soils 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/GGBS were 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 SPSS computer programme. 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 the inclusion of PFA and GGBS can cause reduction in amount of cement in deep soil mixing which can result to reduced cost and emission of CO2 during construction. The developed mathematical and graphical models could give reliable prediction of unconfined compressive strength for weak soil materials with initial UCS less than or equal to 25kPa and for water to binder ratio of unity based on the observed agreement between experimental and predicted data. The developed multiple regression models have also been validated using different mixtures of 6%, 8%, 12% and 16% of binders.
Original languageEnglish
Article number6
Number of pages8
JournalGeotechnical Testing Journal
Volume40
Issue number6
DOIs
Publication statusPublished - 6 Oct 2017

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Ashes
pulverized fuel ash
compressive strength
Compressive strength
Pulverized fuel
Byproducts
Cements
cement
Soils
prediction
slag
Slags
soil
multiple regression
Binders
Plasticity
plasticity
material
by-product
Polymer blends

Keywords

  • Unconfined compressive strength
  • Cement/PFA deep mixing soils
  • Cement/PFA/GGBS deep mixing soils
  • Strength models for improved soils
  • Deep soil mixing
  • Regression model
  • GGBS
  • PFA
  • Cement

Cite this

@article{b3a3b71549104e75a87505addb48a362,
title = "Development of Strength Models for Prediction of Unconfined Compressive Strength of Cement/by-Product Material Improved Soils",
abstract = "This paper presents the possible inclusion of pulverised fuel ash (PFA) and ground granulated blast slag (GGBS) in cement deep soil mixing for enhancement of unconfined compressive strength of weak soil materials for construction purposes. The main focus of this paper was to investigate the unconfined compressive strength (UCS) of cement, Cement/PFA and Cement/PFA/GGBS improved soils 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/GGBS were 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 SPSS computer programme. 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 the inclusion of PFA and GGBS can cause reduction in amount of cement in deep soil mixing which can result to reduced cost and emission of CO2 during construction. The developed mathematical and graphical models could give reliable prediction of unconfined compressive strength for weak soil materials with initial UCS less than or equal to 25kPa and for water to binder ratio of unity based on the observed agreement between experimental and predicted data. The developed multiple regression models have also been validated using different mixtures of 6{\%}, 8{\%}, 12{\%} and 16{\%} of binders.",
keywords = "Unconfined compressive strength, Cement/PFA deep mixing soils, Cement/PFA/GGBS deep mixing soils, Strength models for improved soils, Deep soil mixing, Regression model, GGBS, PFA, Cement",
author = "Samuel Abbey and Samson Ngambi and Esmaiel Ganjian",
year = "2017",
month = "10",
day = "6",
doi = "10.1520/GTJ20160138",
language = "English",
volume = "40",
journal = "Geotechnical Testing Journal",
issn = "0149-6115",
publisher = "ASTM International",
number = "6",

}

TY - JOUR

T1 - Development of Strength Models for Prediction of Unconfined Compressive Strength of Cement/by-Product Material Improved Soils

AU - Abbey, Samuel

AU - Ngambi, Samson

AU - Ganjian, Esmaiel

PY - 2017/10/6

Y1 - 2017/10/6

N2 - This paper presents the possible inclusion of pulverised fuel ash (PFA) and ground granulated blast slag (GGBS) in cement deep soil mixing for enhancement of unconfined compressive strength of weak soil materials for construction purposes. The main focus of this paper was to investigate the unconfined compressive strength (UCS) of cement, Cement/PFA and Cement/PFA/GGBS improved soils 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/GGBS were 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 SPSS computer programme. 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 the inclusion of PFA and GGBS can cause reduction in amount of cement in deep soil mixing which can result to reduced cost and emission of CO2 during construction. The developed mathematical and graphical models could give reliable prediction of unconfined compressive strength for weak soil materials with initial UCS less than or equal to 25kPa and for water to binder ratio of unity based on the observed agreement between experimental and predicted data. The developed multiple regression models have also been validated using different mixtures of 6%, 8%, 12% and 16% of binders.

AB - This paper presents the possible inclusion of pulverised fuel ash (PFA) and ground granulated blast slag (GGBS) in cement deep soil mixing for enhancement of unconfined compressive strength of weak soil materials for construction purposes. The main focus of this paper was to investigate the unconfined compressive strength (UCS) of cement, Cement/PFA and Cement/PFA/GGBS improved soils 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/GGBS were 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 SPSS computer programme. 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 the inclusion of PFA and GGBS can cause reduction in amount of cement in deep soil mixing which can result to reduced cost and emission of CO2 during construction. The developed mathematical and graphical models could give reliable prediction of unconfined compressive strength for weak soil materials with initial UCS less than or equal to 25kPa and for water to binder ratio of unity based on the observed agreement between experimental and predicted data. The developed multiple regression models have also been validated using different mixtures of 6%, 8%, 12% and 16% of binders.

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KW - Cement/PFA deep mixing soils

KW - Cement/PFA/GGBS deep mixing soils

KW - Strength models for improved soils

KW - Deep soil mixing

KW - Regression model

KW - GGBS

KW - PFA

KW - Cement

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DO - 10.1520/GTJ20160138

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VL - 40

JO - Geotechnical Testing Journal

JF - Geotechnical Testing Journal

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