Fineness Effect of Pozzolanic Additive on Strength in Soil Stabilization

Improvement of physical, chemical, mechanical and hydraulic properties of poor bearing soil is called soil stabilization. Within the scope of this study perlite, has inadequate cementing ability by oneself, was used as a pozzolanic additive in stabilization of clayey soil. Lime was chosen as a primary binder due to its high CaO content. Soil was mixed with 6% of lime (optimum lime ratio) and 0%, 5%, 10%, 15%, 20%, 25%, 30% of perlite. Pozzolanic additive perlite was evaluated in natural and finely granulated forms in stabilization study. Geotechnical properties such as index and strength features of mixtures and how this properties may change by fining perlite was considered in the scope of this study. After 84 days of curing period, the highest unconfined compressive strength was determined as 3196 kPa in the samples containing lime and 20% perlite. Samples in which fine perlite was used as an additive material, the highest unconfined compressive strength was reached 3408.9 kPa in samples containing lime and 15% fine perlite. As a result of this study, in which by fining of perlite lower perlite rate gives higher strength values, it was found that fineness of pozzolanic additive perlite has direct effect in strength values