Experimental investigation of crude oil contaminated soil for sustainable concrete production

Abstract

Contaminated soil materials are often unsuitable for engineering construction works due to high content of impurities which inhibits development of mechanical strength and durability properties. This study was therefore necessary to make available empirical evidence revealing the consequences of crude petroleum pollution on the mechanical characteristics of materials made of concrete and determine its effect on civil engineering works. The study involved collection of contaminated soil sample from the Kolomani oil-well in Bauchi State, Nigeria and laboratory evaluation performed to evaluate the engineering possessions of concrete formed from contaminated soil sample. A calculated ingredient at a proportion of water to cement (W/C) set at 0.5, a mix proportion of 1:1.8:2.7 was used with the fine aggregate content replaced partially with crude oil contaminated soil materials (COCM) from 0-40%. The obtained laboratory results showed rise in compressive strength property as COCM fraction increases with the optimal response of 16.36 N/mm 2 derived at 20% replacement. The experimental results was further subjected to statistical analysis using one-way ANOVA and F-statistics to test the source of variation for the geotechnical properties. Multiple Linear Regression (MLR) and correlation statistics were then used to establish relationship between mix ratios and the geotechnical properties. The results signifies good performance with R-squared of 82.81. The benefits derived from this work would enhance production of sustainable concrete works which can be applicable in large scale for tile production.

Spatial variability of heavy metals concentrations in soil of auto-mechanic workshop clusters in Nsukka, Nigeria

“…This was done by introducing a known weight of dried sample soil, crushed with mortar and rubber pestle, into a set of successive sieves with decreasing sieve sizes and shaken with sieve shaker for 15 min. The successive percentages of soil particles retained were calculated 32 , 33 . The process of soil particle analysis involved cleaning the sieve shaker's sieves, recording their weights, drying soil samples, and arranging sieves (sizes ranging from 2–0.002 mm) in ascending order.…”

Scheffe’s Simplex Optimization of Flexural Strength of Quarry Dust and Sawdust Ash Pervious Concrete for Sustainable Pavement Construction

“…This experimental program comprises a pervious concrete mixture with the five components of cement, water, quarry dust, fine aggregates and sawdust ash in the matrix. Using Scheffe’s simplex lattice statistical approach, the formulation of the mixture ingredients’ combinations for the experiments was determined within the designed factor space using the mathematical relationship between the actual and pseudo-components [ 33 ]. The formulated mixture ingredients ratios were converted into an effective mass using the density–mass–volume relation and taking the standard concrete density of 2400 kg/m 3 and the beam mold volume of 0.004 m 3 .…”

Optimization of cassava peel ash concrete using central composite design method

“…values of 0.8675 and 0.9102 for compressive and flexural strength responses, respectively. From the sequential sum of squares computation results, p value of 0.0237 and 0.0014 for compressive and flexural strength responses respectively 38 , 48 .…”