A Laboratory study on water transfer properties of unsaturated compacted lateritic Soil – Bacillus coagulans mixtures

Paul Yohanna; Thomas stephen Ijimdiya; kolawole  Juwonlo Osinubi; Adrian Oshioname Eberemu

doi:10.57056/ajet.v6i1.69

Authors

Paul Yohanna Department of Civil Engineering, University of Jos, Plateau State, Nigeria
Thomas stephen Ijimdiya Department of Civil Engineering, Ahmadu Bello University, Zaria, Kaduna State, Nigeria.
kolawole Juwonlo Osinubi Department of Civil Engineering, Ahmadu Bello University, Zaria, Kaduna State, Nigeria.
Adrian Oshioname Eberemu Department of Civil Engineering, Ahmadu Bello University, Zaria, Kaduna State, Nigeria.

DOI:

https://doi.org/10.57056/ajet.v6i1.69

Keywords:

B. coagulans, Brooks-Corey model, Fredlund-Xing model, Lateritic soil, Van Genuchten model, Unsaturated hydraulic conductivity

Abstract

A study on soil water characteristic curves (SWCC) and unsaturated hydraulic conductivity (UHC) of lateritic soil–Bacillus coagulans mixes was done. Three well known models (i.e van Genuchten (VG), Brooks-Corey(BC) and Fredlund-Xing (FX)) were used to predict SWCC and UHC from laboratory test results. Soil samples for the test were admixed with B. coagulans at one-third (1/3) pore in step suspension densities of 0 to 2.4x10⁹cells/ml. Soil samples were then compacted differently with Reduced British Standard light (RBSL), British Standard light(BSL),West African Standard (WAS) and British Standard heavy(BSH) compactive efforts. Cementitious reagent was injected into the compacted soil using gravity up until saturation was attained. Specimens after being compacted were then cored out from the mould using stainless steel cylindrical moulds. The specimens (i.e., inside the stainless steel cylindrical moulds) were then immersed in water chamber till the samples were completely saturated via capillary action and thereafter allowed to undergo a pressure plate drying(PPD) test. Matric suctions of 0, 10, 30, 100, 500, 1000 and 1500kPa, respectively, were used. Result of SWCCs show that with a rise in matric suction, the volumetric water content(θ) declined progressively for all the models (i.e van Genuchten (VG), Brooks-Corey(BC) and Fredlund-Xing(FX)) and the experimental measured values. The UHC slightly reduced with rise in B.coagulans suspension density for VG, BC and FX models. At 500 and 1500kPa matric suctions (MS), BC model documented the least UHC values and satisfied the regulatory lowest hydraulic conductivity value of 1.0×10^-9m/s for use in containment system. Thus, is suggested for modelling the UHC of lateritic soil ̶ B.coagulans mixtures.

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