Geotechnical Engineering Journal of the SEAGS & AGSSEA ISSN 0046-5828
Vol. 48 No.4 December 2017
Shear Strength of an Expansive Overconsolidated Clay Treated with Hydraulic Binders
By A. Mahamedi and M. Khemissa
ABSTRACT: This paper presents and analyzes the results of a series of identification; compaction and direct shear tests performed in accordance with the Algerian standards on expansive overconsolidated clay treated with locally manufactured hydraulic binders (composed Portland cement and extinct lime). This clay comes from the urban site of Sidi-Hadjrès city (wilaya of M’sila, Algeria), where significant damages frequently appear in the road infrastructures, roadway systems and various networks and in civil and industrial light structures. Tests results show that the geotechnical parameters deduced from these tests are concordant and confirm the shear strength improvement of this natural clay treated with cement or lime and compacted under the optimum Proctor conditions. However, contrary to its mineralogical characteristics which do not seem to be affected by the treatment, this expansive natural clay is characterized by as well drained as undrained shear strength sensitive to stabilizer content; the best performances are obtained for a treatment corresponding to 8% cement or lime content.
KEYWORDS: Expansive clay, Treatment, Hydraulic binders, Shear strength.
