RESILIENT POISSON'S RATIO OF HYDRAULIC, GRADED IRON AND STEEL SLAG BASE-COURSE MATERIAL FOR PAVEMENT RESPONSE ANALYSIS

Abstract

This paper discusses resilient Poisson's ratio of hydraulic, graded iron and steel slag base-course material based on a series of repeated loading triaxial compression tests on the specimens compacted with a maximum dry density and an optimum water content a nd cured for 0, 28, 91 and 365 days. It is shown that resilient Poisson's ratio for no cured specimens is stress dependent in such a way that it increases with deviatoric stress and decreases with mean effective principal stress. As curing time increases, however, the magnitude of resilient Poisson's ratio becomes smaller and its stress dependency vanishes: at curing time of one year, resilient Poisson's ratio appears independent on both mean effective principal and deviatoric stresses and can be taken as constant. Resilient Poisson's ratio can be well expressed by a power function of these two stresses. It is indicative that stress-dependency in resilient Poisson's ratio fades away after hydraulicity has sufficiently developed, which may justify the use of a constant value for resilient Poisson's ratio in pavement response analyses.