FATIGUE BEHAVIOR OF HIGH VOLUME FLY ASH CONCRETE UNDER CONSTANT AMPLITUDE AND COMPOUND LOADING
Keywords:
Compound Fatigue Loading, High Volume Fly Ash Concrete, Probability Distribution, LognormalAbstract
Road projects in future have to be environmental friendly and cost effective apart from being safe so that society at large is benefited by the huge investments made in the infrastructure projects. To achieve this, component materials of the pavement system have to be optimized with reference to cost effectiveness, sustainability and fatigue behavior. This paper presents a study on fatigue behavior of high volume fly ash concrete (HVFAC) and conventional concrete (PCC) under constant amplitude fatigue loading. Also behavior of HVFAC was studied under compound fatigue loading. In the present investigation HVFAC mix with cement replacement level of 60% with low calcium fly ash has been used. A total number of 95 prism specimens of HVFAC were tested under constant amplitude fatigue loading. Also 100 prism specimens of PCC were tested under constant amplitude fatigue loading for comparative studies. All prism specimens were of size 75mm×100mm×500mm and were tested under flexural fatigue loading using haiver sine wave loading. Frequency of fatigue loading was kept at 4Hz. Lognormal model was verified for probability distribution of fatigue life. Studies indicated that lognormal model was acceptable for fatigue life distributions at all stress levels for both HVFAC and PCC. The parameters of distribution exhibited dependency on stress levels and type of concrete. Relations between stress level and fatigue life were developed for both HVFAC and PCC. These relations were found to be dependent on type of concrete. A total number of 24 prism specimens were tested under compound fatigue loading. Based on the results of compound fatigue loading the validity of Miner’s hypothesis for high volume fly ash concrete was verified. It was found that Miner’s hypothesis gives both unsafe and over safe predictions of failure. Miner’s sum was found to be dependent on type of compound loading and sequence of loading.
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Copyright (c) 2020 Aravindkumar.B.Harwalkar, S.S.Awanti (Author)
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