BEHAVIOUR OF GRANULAR MATERIALS UNDER CYCLIC LOADING

Abstract

The main objective of present research on granular materials is to establish the constitutive relationships to predict resilient and permanent strains accurately. The quality of pavement design is dependent on the manner in which the material properties are evaluated. Static testing of material does not simulate the repeated loading caused by the traffic. The traffic type loading is defined by the resilient response, which is important for the load carrying ability of the pavement and a permanent strain response, which characterizes the long-term performance of the pavement and the rutting phenomenon. India has vast material resources. The cost of construction of roads can be reduced and the economy also be enhanced, if the locally available materials are used. Present study deals with the study of behavior of granular materials under cyclic loading. Four different types of materials namely reinforced fly ash,. stone dust, granulated blast furnace slag (GBFS), steel making slag (SMS) are considered. To evaluate the material properties, Proctor's tests, CBR tests, static and dynamic tests are conducted on the materials. It is observed that SMS brought from Visakhapatnam steel plant, Andhra Pradesh, has good CBR, modulus of elasticity, resilient modulus and low permanent strain. Stone dust is having more permanent strain, which is the indicator of rutting phenomenon. Reinforced fly ash has low CBR and low permanent strain compared to stone dust. Out of the four materials, SMS is the best material and it can be used in subbase layer. iii