Etude expérimentale sur l`impact du diamètre moyen sur la résistance au cisaillement des mélanges sables-granules de caoutchouc
Loading...
Date
2025
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Mahmoudi Youcef
Abstract
The stability of granular soils, crucial in geotechnical engineering, can be significantly
improved by the addition of recycled materials, particularly rubber granules. However,
combined effects of the average sand particle diameter (D₅₀) and rubber content on the
mechanical behavior of these mixtures remain poorly explored. This experimental study aims
to evaluate the influence of these two parameters on the shear strength of sand–rubber
mixtures, using direct shear tests with the Casagrande box. Three sand particle sizes (D₅₀ = 1
mm, 2 mm and 3.15 mm) were mixed with five proportions of recycled rubber granules (0%,
2.5%, 5%, 7.5% and 10%), then subjected to three levels of normal stress (100, 200 and 400
kPa) at a high relative density (Dr = 90%). The results reveal that increasing the average sand
grain diameter significantly improves the maximum shear strength, the angle of internal friction
as well as the dilatancy, with a particularly marked effect under low normal stress. At the same
time, the incorporation of rubber granules strongly influences the mechanical behavior of the
mixtures, with a maximum improvement in strength observed for an optimal content of 5%,
beyond which a decrease is observed. An exponential relationship was identified between the
friction angle and the average diameter, while the beneficial effect of granules was more
pronounced under normal stress (200 kPa). These results confirm on the combined role of
grading and rubber addition in strengthening granular soils and open up promising prospects
for their use in soil improvement in sustainable civil engineering projects
Description
Mémoire de Master
Filière: Génie Civil
Spécialité: Géotechnique
Keywords
Granular soil, rubber granules, shear strength