Comparative Study of Cumulative Damage of Pavement Concrete Under Splitting Tensile, Variable Amplitude Fatigue Loadings (05-2052)
Kyong-Ku Yun, Kangwon National University, South Korea
Dong-Ho Kim, University of Texas, Austin
Won-Kyong Jeong, Daewoo Engineering and Construction Company, Ltd., South Korea
Chimoon Won, Halla University, South Korea

The purpose of this study was to compare the cumulative damages of pavement concrete under splitting-tensile variable-amplitude fatigue loadings by splitting-tensile and flexural-tensile tests. The cumulative damage theories adapted in this study included linear damage theory, nonlinear damage theory, and equivalent damage theory. The results were as follows: The sums of cumulative damage were greater in the flexural-tensile test than in the splitting-tensile test, even though the difference between them in each load case was small. Those at higher stress levels showed values further from 1 than at lower stress levels. The primary findings suggested that Miner¡¯s Rule might be applied to plain concrete with little error, provided the stress level remains low. The accumulation damage obtained by nonlinear damage theory was closer to 1 than by linear damage theory in all load cases, except for Case E. This indicated that nonlinear cumulative damage could consider the effects of magnitude and sequence of variable-amplitude fatigue loadings. The theoretical results calculated from equivalent damage were quite similar to those from experimental results, except in load case E, even though the equivalent damage theory was very simple. The results from the splitting-tensile test were equivalent to or better than from the flexural-tensile test in applying equivalent damage theory. Thus, the splitting-tensile test and equivalent damage could be used for estimating to the damage and remaining life of pavement concrete under variable-amplitude fatigue loadings.