Probability Analysis of Flexural Fatigue Data of High Volume Fly Ash Concrete

摘要

There is a need for the development of Eco friendly and cost effective material for the rigid pavement construction. High volume fly ash concrete suits the pavement concrete due to its many advantages. The knowledge of fatigue behavior is essential for the design of concrete pavements. This paper describes the probabilistic analysis of flexural fatigue behavior of high volume fly ash concrete. High volume fly ash concrete mixtures, satisfying the criteria of pavement concrete, were proportioned using low calcium fly ash. A total number of 225 beam specimens at three cement replacement levels (0%, 50% and 60%) were tested under non reversed cyclic wave loading. Lognormal model was found to be satisfactory for the fatigue life distribution in all the cases. The parameters of the log normal distribution model were found to be dependent on the stress level. Fatigue model was developed in the form of relation between the stress level (S) and the fatigue life (N). S-N relations were established for high volume fly ash and reference concrete mixes at different reliability levels.