Investigation of fracture resistance of roller-compacted concrete pavement modified with synthetic fibers

Document Type : Research Article


Department of Civil Engineering, Ahar Branch, Islamic Azad University, Ahar, Iran


Roller compacted concrete pavements (RCCP) are considered as an adjunct of solid pavements. High strength at early age, faster construction, and relatively low cost, are benefits of such pavements to be mentioned. One obstacle of these types of pavements is that using steel bars as reinforcement is not possible. This disadvantage results in low ductility and strength. So far, researchers have presented numerous solutions to address these issues, such as implementing fibers. The aim of this study is the investigation of fracture resistance of RCCP modified with polyolefin-aramid fiber in different loading modes (pure mode I, pure mode II and mixed-mode I/II). For this purpose, liner elastic fracture mechanics (LEFM) was used for obtaining the fracture resistance of RCCP with polyolefin[1]aramid fibers with percentages of 0.1%, 0.3%, and 0.5% by weight and 20 mm length. The results showed that the minimum fracture toughness of RCCP occurs under pure mode II loading conditions, showing that both plain RCCP and polyolefin-aramid fiber-reinforced RCCP represent less resistance against fracture under pure II conditions. It is found that adding polyolefin-aramid fibers more than 0.3% by weight of the mixture does not lead to a significant improvement of the fracture resistance.


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