In a significant advancement for road construction in Nigeria, a recent study has demonstrated how agricultural by-products, specifically Palm Kernel Shell Ash (PKSA) and Egg Shell Ash (ESA), can effectively stabilize lateritic soil, a material widely used in the region’s infrastructure projects. The research, led by Sulaiman Olayinka Subair from the Department of Civil Engineering at Kwara State University, highlights an innovative approach to enhancing soil properties while addressing environmental concerns related to agricultural waste.
Lateritic soil, while abundant, often requires modifications to meet the engineering standards necessary for durable road construction. The study, published in the ABUAD Journal of Engineering Research and Development, reveals that the combination of 4% PKSA and 8% ESA significantly improves the soil’s characteristics, making it suitable for use as a sub-base material in road pavement applications. This finding is particularly relevant given Nigeria’s ongoing challenges with waste disposal and the environmental degradation that follows.
“Using PKSA and ESA not only enhances the mechanical properties of lateritic soil but also provides a sustainable solution to agricultural waste management,” Subair stated. The geotechnical tests conducted on both natural and stabilized soil samples showed notable improvements in parameters such as California Bearing Ratio (CBR), Maximum Dry Density (MDD), and Optimum Moisture Content (OMC). For instance, while the natural lateritic soil had a CBR of 22%, the stabilized samples exhibited values soaring up to 80%, indicating a substantial increase in load-bearing capacity.
The implications of this research extend beyond mere academic interest. By integrating these agricultural by-products into construction practices, the industry can reduce reliance on conventional materials, which often come with higher environmental costs. This shift not only promotes sustainability but also opens up new avenues for local economies, particularly in rural areas where palm and egg production are prevalent.
As the construction sector increasingly focuses on sustainable practices, the findings from Subair’s research could pave the way for broader adoption of waste-derived materials in road construction. “This study is a step toward a more sustainable future in civil engineering, where we can utilize what we have in abundance to build better infrastructure,” he added.
With ongoing infrastructure development initiatives in Nigeria and beyond, the potential for commercial impact is significant. The application of PKSA and ESA could lead to cost reductions in material sourcing, promote environmental stewardship, and enhance the durability of road networks. As the construction industry continues to grapple with sustainability challenges, research like this provides a crucial blueprint for future developments.
For more insights into this transformative research, visit the Department of Civil Engineering at Kwara State University.
