Abstract
It is very essential to improve on the study of stabilization, as we investigate the potential of Processed Palm Kernel Shell Ash (PPKSA) as a Local stabilizer in stabilizing clay soil. The ever-increasing cost of construction materials in Nigeria and other developing countries has created the need for improved research into locally and readily available materials and also on how to convert these local materials such as Palm Kernel Shell Ash for use in construction and soil improvement. To achieve this; soil samples were collected from Ntak – Uyo, Akwa Ibom State classified as an A-2-5 soil on AASHTO and CL on UNIFIED SYSTEM of classification, were sieved and passed through sieve No. 36. It was then stabilized with (2-7%) Processed Palm Kernel Shell Ash (PPKSA) by weight of the dry soil. The investigation includes evaluation of the engineering and geotechnical properties of the soil. 
 The results obtained shows that the increase in PPKSA content at 4.5% increase the Optimum Moisture Content (OMC) by 16.74%, Maximum Dry Density (MDD) by 1.89 gm/cm3, Unconfined Compressive Strength (UCS) by 433.12 kN/m2, California Bearing Ratio (CBR) by 55% for unsoak and 36% for soak while there was a significant reduction in the value of Liquid Limit (LL) by 30.92% and Plasticity Index (PI) by 10%. The predictive models were developed, and these models showed a good correlation with experimental results in the control tests as they possess a reasonable significant difference and a strong relationship between the measured and predicted values.
 The study concluded that PPKSA can be used to improve the properties of soil for construction purposes and 4.5% PPKSA content was observed to yield maximum improvement for OMC, MDD, CBR and UCS values.
Highlights
Road is the key infrastructure of a country
The results obtained shows that the increase in Processed Palm Kernel Shell Ash (PPKSA) content at 4.5% increase the Optimum Moisture Content (OMC) by 16.74%, Maximum Dry Density (MDD) by 1.89 gm/cm3, Unconfined Compressive Strength (UCS) by 433.12 kN/m2, California Bearing Ratio (CBR) by 55% for unsoak and 36% for soak while there was a significant reduction in the value of Liquid Limit (LL) by 30.92% and Plasticity Index (PI) by 10%
For the economic, cultural, and social development of a country, an effective and adequate system of transportation is essential in order words there must be well constructed roads linking the cities because a country’s economic status depends so much on how well served the country is by its roads
Summary
Road is the key infrastructure of a country. It contributes to the economic, industrial, and cultural development of a country. A country’s economic status depends upon how well served the country is by its roads. Road is vital for the all-round development of a nation since every goods and services, need transport facilities both at the production stage as well as distribution stage. For the economic, cultural, and social development of a country, an effective and adequate system of transportation is essential in order words there must be well constructed roads linking the cities because a country’s economic status depends so much on how well served the country is by its roads. The rate at which a country’s economic grows is very closely linked to the rate at which the transport sector grows
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