A. B. Fajobi

Obafemi Awolowo University | OAU · Department of Civil Engineering

The effective use of residual laterite soils is usually hindered because of their mineralogy and high fines content. This paper studied the potential improvement in the geotechnical and mineralogical properties of fly ash-treated residual laterite collected from Southwest Nigeria. Some physical and geotechnical properties, such as plasticity, compa...

In this paper, a general model in environmental engineering that relates alum concentration, pH and other chemical treatment factors to the efficiency of chemical treatment techniques was obtained from the literature as a way to evaluate the performance of selected methods of solving simultaneous equations in environmental engineering. Data on text...

Information and adequate data on the intensity–duration–frequency of rainfall are regular requirements to reduce and correct variations in hydrologic, environmental and hydraulic applications, which are vital elements in Civil and Environmental engineering works. This paper focuses on the utilization of the Statistical Package for the Social Scienc...

Land is a sine qua non of human existence, and has been conceived as integral and most valuable resources, which are indispensable for human development. Hitherto, in spite of massive land space and fertile soil, land mismanagement constitutes a serious challenge to the attainment of sustainable food security in Nigeria. Ostensibly, the increased l...

This paper investigated the effect of cement kiln dust (CKD) and periwinkle shell ash (PSA) on the plasticity characteristics of two lateritic soil. Two Soils (termed soil A and B) were collected from two selected locations within Osun State, Nigeria. Air-dried soil was treated with CKD and PSA blend in order of 0, 5, 10, 15, and 20% for CKD and 0,...

This paper investigates the comparative effects of the use of polypropylene fibres and coconut coir on restrained shrinkage and compressive strengths of concrete. Polypropylene fibres and coconut coir were cut (20 and 40 mm lengths) using 0.05 and 0.1% volume fraction of cement and were added to the concrete mix to cast 27 concrete prisms each for...

The changes in the compressive strength of laterized bricks produced from stabilised residual tropical laterite (RTL) are reported in this paper. The RTL was stabilised with different percentages (2, 4, 6 and 8%) by weight of dry soil of 1M phosphoric acid (PA). Some geotechnical properties and elemental oxide composition of the RTL were determined...

This study presents the influence of cassava peel ash (CPA) and lime on some geotechnical properties of three lateritic soils. This is with a view to the use of locally available agricultural waste in stabilising lateritic soils. Soil samples (termed A, B, and C) were collected from three different locations in Osun state, South West, Nigeria. Some...

The stabilization potential of cement kiln dust (CKD) and periwinkle shell ash (PSA) was investigated using laboratory analysis. This was aimed at evaluating the effect of CKD and PSA on the stabilization of two lateritic soils for use as pavement layer materials. Two soils (Soil A and B) were treated with various percentages (by weight of dry soil...

The source of groundwater seepage problem being experienced by some engineering buildings in a part of southwestern Nigeria was investigated by carrying out comparative study of the hydraulic conductivity (K) of the soil types underlying the area using integrated approaches involving geotechnical and geophysical methods. Soil samples were collected...

This paper assesses the causes and socioeconomic impact of some recent cases of collapsed buildings in Nigeria. Information on selected collapsed buildings was collated, and a case study of a failed one-story building is presented for emphasis. A summary of the technical assessment and remediation of the building was presented as well. Both field a...

This study investigated the stabilizing potential of cement-fly ash on expansive clay with a view to discovering a more effective soil stabilization method for road works. It was carried out between July 2003 and March 2004 in Civil Engineering Department, Obafemi Awolowo University, Ile-Ife, Nigeria.The expansive clay soil samples were first subje...

Soil treatment or stabilization is highly recognized by geologist and engineers as a very important process in improving the performance of weak or marginal soils and make them perform better as highway materials. This study was an investigation of the potential of stabilizing an expansive clay soil with the combination of cement and fly ash. The e...

This research was meant to study the effect of Eggshell Powder (ESP) on the stabilizing potential of lime on an expansive clay soil. Tests were carried out to determine the optimal quantity of lime and the optimal percentage of lime-ESP combination; the optimal quantity of lime was gradually replaced with suitable amount of eggshell powder. The lim...