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ABSTRACT
This paper represents an experimental study on the application of asphalt as a stabilizing agent on lateritic soil. Soil stabilization is the process which is used to improve the engineering properties of soil and thus making it more suitable for construction. In this experiment, Asphalt was the stabilizing agent used to test how well the soil will behave by its addition in the various percentages; 2%, 4%, 6%, 8% and 10%. The Lateritic soil sample was obtained from 19th street, BDPA Benin City at latitude and longitude of 6.3961885E and 5.6007606N and the asphalt was obtained from Aceegbe Asphalt plant, Benin City at latitude and longitude of 6.2607362E and 5.6402827N. The laterite soil and asphalt were transported to the Geotechnical laboratory in the Civil Engineering Department, University of Benin and several laboratory tests were carried out in order to obtain the index and engineering properties of the soil. The following tests were conducted; Sieve Analysis, Specific Gravity, Atterberg limit test, Compaction test, Carlifornia Bearing Ratio test and Triaxial test and in order to check if the Asphalt is fit for use, Marshall test was conducted. By mixing the soil with varying percentages of 2% to 10% asphalt, the following results were obtained; After the CBR experiment was conducted, the best percentage was 2% because it had the highest value in the soaked condition and it passed the required standard for a subgrade which is a minimum of 5%. From the triaxial test conducted, it showed that 10 % had a better result for stabilization in this case because it has the highest value of the angle of internal friction which reflects the strength of the soil based on the percentage of coarse grain in the soil composition. From the experiment, it was observed that there was more coarse grain present in the soil after the addition of asphalt. When more coarse grain is present in the soil, it increases the strength of the soil thereby making it fit for construction.
