Pervious concrete under flexural fatigue loading: Performance evaluation and model development

摘要

Pervious concrete (PC) is used for parking lots and streets that are subjected to repeated wheel loading, therefore it is necessary to characterize the fatigue life (N) of PC for pavement design. This research investigates the behavior of PC beams made with two aggregates (angular and round) and three porosity levels (20%, 25% and 30%) under flexural fatigue loading in three stress ratios (SR:) 0.75, 0.8, and 0.85. The results showed that N is controlled by SR, while porosity showed no statistically significant effect on flexural fatigue. Two-parameter Weibull distribution was fitted to the test data to generate fatigue models at different reliability levels. Using the existing model for portland cement concrete (PCC) for PC results in an overestimation of N for SR 0.75 due to the highly porous and brittle macrostructure of PC. Existing PCC model agrees with the proposed PC model in predicting N at 0.5 SR 0.75, while overestimates N at SR 0.5. The proposed fatigue model can be used in the thickness design of PC pavements. (C) 2019 Elsevier Ltd. All rights reserved.