Effet de la combinaison de la chaux et de la pouzzolane naturelle sur le compactage et la résistance des sols mous argileux

Abstract

Abstract. Soft 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 investigations on the use of natural pozzolana alone or combined with lime for ground improvement applications. An experimental program was undertaken to study the effect of using lime, natural pozzolana or a combination of both on the geotechnical characteristics of soft soils. Lime or natural pozzolana was added to soft soils at ranges of 0-10% and 0-20%, respectively. In addition, combinations of limenatural pozzolana were added to soft soils at the same ranges. Test specimens were subjected to compaction tests and unconfined compression tests. Specimens were cured for 1, 7, 28 and 90 days after which they were tested for unconfined compression tests. Based on the favourable results obtained, it can be concluded that the soft soils can be successfully stabilized by the combined action of lime and natural pozzolana. Since natural pozzolana is much cheaper than lime, the addition of natural pozzolana in limesoil mix may particularly become attractive and can result in cost reduction of construction.Résumé. La stabilisation des sols mous a été pratiquée longtemps en mélangeant des ajouts, tels que le ciment, la chaux et les cendres volantes au sol pour augmenter sa résistance. Cependant, il y a un manque d'investigations sur l'utilisation de la pouzzolane naturelle seule ou combinée avec la chaux pour les applications d'amélioration des sols. Un programme expérimental a été entrepris pour étudier l'effet de la chaux, la pouzzolane naturelle ou leur combinaison sur les caractéristiques géotechniques des sols mous. La chaux ou la pouzzolane naturelle ont été ajoutées aux sols par des teneurs de 0-10% et 0-20% respectivement. Les échantillons préparés ont été soumis aux essais de compactage et de résistance à la compression non confinée. Les échantillons ont subis des périodes de cure de 1, 7, 28 et 90 jours après quoi ils ont été soumis aux essais de la résistance à la compression non confinée. Basé sur les résultats favorables obtenus, il This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Effect of Cement and Compaction on the Physicochemical Behavior of a Material in the Region of Sidi Bel Abbes

“…This observation is in good agreement with the results in [6,[18][19][20]. Similar trends of the liquid limit have been observed by other researchers on materials treated with lime and pozzolan [9,21], and on materials treated with fly ash [22][23][24].…”

“…The same trends have been observed on materials treated with lime [28] and on materials treated with limestone [5]. The same behavior was also observed in [9,22,[29][30]. It has been shown that the addition of fly ash at low calcium soil swelling causes an increase in the plasticity limit, this is due to the replacement of the fine particles by the larger particles [7,9].…”

“…Even after treatment we found that the material remains in the same family group (A 1 ) according to [12]. Despite the considerable decrease in the blue value and the plasticity index, similar results were found in [9].…”

“…It has been shown that the addition of fly ash at low calcium soil swelling causes an increase in the plasticity limit, this is due to the replacement of the fine particles by the larger particles [7,9]. However, some authors have shown a decrease in the plastic limit, when the material is treated with a mixture of lime-pozzolana with a high content of lime (> 10% lime) [9].…”

“…Using local materials of poor quality that are generally ignored in favor of good soils provides obvious economical advantages. Different mechanical or chemical methods are used in the treatment of soil compaction [1][2], pre-loading [3] and chemical treatment [4][5][6][7][8][9]. Today hydraulic binders treatment extends to an increasingly large number of soils: silt, clay, marl, sandy material, sandy-gravelly and gravelly etc... Cement appears to be a very effective stabilizer product.…”