ABSTRACT
In South Africa, the use of stabilizing agents in road construction has been in practice for some years. The province of KwaZulu Natal, in South Africa is currently undergoing some road rehabilitation projects with the investigation of properties of lime stabilized soil-the pH value being one of the necessities to understand the behavior of the soil. In this study, six selected soil samples of different pH scales were used and the effects of the lime stabilizer on the pH values were determined in the laboratory. The percentage of lime used in the samples varied from 2%, 4%, 6%, 8% to 10% by weight method of the soil samples that were tested. From the analysis carried out, it was found that the treatment of the samples with lime content changed the pH of the samples from acidic to alkaline and the value increased with increasing lime content for all the samples. For examples the pH value for sample one changed from 3.94 to 4.02, sample two changed from 4.54 at 4.92, Sample three changed from 4.50 at 5.22, sample four changed from 8.95 to 9.20, sample five changed from 8.05 at 8.27 and sample six from 8.34 at 8.68 on average lime. The changes were as a result of the changes in the chemical properties and the composition of the samples due to their chemical reactions with lime additive.
