Publication: Early strength and stiffness Development of pofa-stabilised Marine clay with mgo as activator: a Numerical analaysis
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Date
2024-04-01
Authors
Al-Dalain Nour, Abdul Wahab Awwad
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Abstract
Soil improvement techniques have developed, with nontraditional methods
becoming more popular, that causes the importance of finding suitable materials, such
as waste material as a less expensive and eco-friendly solutions. Over the years,
investigating the behaviour of soft soil stabilized using different techniques has been
recognized as a critical priority for geotechnical engineers. Numerous soil constitutive
models were previously employed to simulate the behaviour of stabilized soil,
including improving strength and ductility, and analysing load-deformation response.
However, further investigation is required to study stabilized soil's time-dependent
strength and stiffness, especially at an early curing age which helps to explore the
efficiency of the stabilizers by giving a full comprehension for the behaviour of
stabilized soil from the first hour of curing. With its abundant availability and eco friendly nature, Palm Oil Fuel Ash (POFA) has gained increasing attention from
researchers and practitioners as an alternative to traditional soil stabilizers. This study
proposes an advanced concrete constitutive model to simulate the time-dependent
strength and stiffness of POFA-stabilized and cement-stabilized soil with time due to
pozzolanic interactions. In particular, the proposed model captures the strength and
stiffness improvement at the very early age of curing until 28 days using finite element
analysis (FEA), then compared with experimental results. Based on experimental
results, UCS values of POFA-stabilized soil grew to 3.18 MPa and 3.89 MPa after 7
and 28 days with an optimum content of 30% (POFA):10% Magnesium Oxide (MgO).
It exhibited a significant increase in early strength with 64.02 % compared to cement stabilized soil. For stiffness results, a slight increment of 8% was observed at 28 days. Employing FEM, the sensitivity analysis of the parameters on stress-strain behaviour
was investigated to show the effect of each model parameter on the stress strain curve
of the stabilised soil. Finally, the validity of the concrete constitutive model in
prediction the time-dependent strength and stiffness of stabilized soil was proved. The
findings revealed the capability of the model to accurately estimate the improvement
of strength and stiffness of the stabilized soil during curing period.