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Effect of the Combination of Lime and Natural Pozzolana on the Durability of Clayey Soils Khelifa Harichane Geomaterials Laboratory, Civil Engineering Department,
University of Chlef, Algeria Mohamed Ghrici Geomaterials Laboratory, Civil Engineering Department,
University of Chlef, Algeria Wiem Khebizi Civil Engineering Department, University of Chlef, Algeria Hanifi Missoum Civil Engineering Department, University of Mostaganem, Algeria ABSTRACT |
Soil stabilization has been practiced for quite some time by mixing additives, such as cement, lime and fly ash to the soil to increase its strength. However, there is a lack of investigation on the use of natural pozzolana alone or combined with lime for ground improvement applications. In this study, the impact of cyclic wetting and drying on compressive strength behaviour of lime-natural pozzolana stabilized clayey soils has been investigated. Lime or natural pozzolana was added to clayey soils at ranges of 0-8% and 0-20%, respectively. In addition, combinations of lime-natural pozzolana were added to clayey soils at the same ranges. Specimens were cured for 7 and 28 days after which they were tested for unconfined compressive tests and for wetting-drying durability tests. Based on the durability results obtained, it can be concluded that the clayey soils stabilized by the combined action of lime and natural pozzolana exhibits high performance and survive a full 12 cycles of wet-dry testing. On the other hand, the residual compressive strength increases significantly compared to initial compressive strength. Moreover, the results of tests show that the combination lime-natural pozzolana can effectively improve the durability of clayey soils from poor to excellent.
Keywords: lime, natural pozzolana, clay, wet-dry cycle, strength, soil stabilization.
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