Cyclic Triaxial Tests on Crushed Limestone for Base Layers: Fid-Bau Portal

Cyclic Triaxial Tests on Crushed Limestone for Base Layers

Adhikari, Pradip / Osouli, Abdolreza

Unbound aggregate utilized in base and subbase layers distribute the imposed load induced stresses to protect subgrade. Although the percentage of fines content in aggregates used for these layers rarely exceeds 20%, however, the behavior of aggregate skeleton is significantly influenced by the fines content characteristics. In this study, the effect of fines content (from 5% to 12%), plasticity index (from 5% to 9%), and dust ratio (from 0.4 to 1.0) of crushed limestone aggregate matrix on cyclic behavior of base and subbase layers are investigated. Cyclic tests are conducted to identify the resilient modulus, recoverable and permanent deformation of crushed limestone samples prepared at optimum moisture content with Illinois dense-graded standard gradation, i.e., CA 6. It is observed that fines content 12% is sensitive to permanent deformation and resilient modulus when the dust ratio is 0.4 and 0.6. However, at dust ratio 1.0, fines content 12% also showed effective response against permanent deformation and resilient modulus. With an increase of fines content from 5% to 12%, the permanent deformation increased and resilient modulus decreased when the dust ratio was 0.4 and 0.6, however, it behaved completely opposite at dust ratio of 1.0.