Abstract
Tensile performance of fiber-reinforced cementitious composite (FRCC) after first cracking is characterized by fiber-bridging stress–crack width relationships called bridging law. The bridging law can be calculated by an integral calculus of forces carried by individual fibers, considering the fiber orientation. The objective of this study was to propose a simplified model of bridging law for bundled aramid fiber, considering fiber orientation for the practical use. By using the pullout characteristic of bundled aramid fiber obtained in the previous study, the bridging laws were calculated for various cases of fiber orientation. The calculated results were expressed by a bilinear model, and each characteristic point is expressed by the function of fiber-orientation intensity. After that, uniaxial tension tests of steel reinforced aramid-FRCC prism specimens were conducted to obtain the crack-opening behavior and confirm the adaptability of the modeled bridging laws in crack-width evaluation. The experimental parameters are cross-sectional dimensions of specimens and volume fraction of fiber. The test results are compared with the theoretical curves calculated by using the modeled bridging law and show good agreements in each parameter.
Highlights
Fiber-reinforced cementitious composite (FRCC) is cementitious material reinforced with short discrete fibers showing ductile behavior of composite, especially in tensile and bending stress
strain hardening cement composite (SHCC) and engineered cementitious composite (ECC) show pseudo-strain-hardening behavior and multiple-fine-cracking behavior under uniaxial tension. These types of FRCCs have been applied for the actual structures such as walls, beams, slabs and decks, tunnel linings, etc. [2,3]
The objective of this study was to propose a simplified model of bridging law of bundled aramid-FRCC, considering fiber orientation
Summary
Fiber-reinforced cementitious composite (FRCC) is cementitious material reinforced with short discrete fibers showing ductile behavior of composite, especially in tensile and bending stress. In the past several decades, various types of FRCCs, such as ductile fiber-reinforced cementitious composite (DFRCC) [1], strain hardening cement composite (SHCC) [2], and engineered cementitious composite (ECC) [3], have been studied by lots of researchers. DFRCC shows a deflection hardening behavior and multiple cracking behavior under bending field. SHCC and ECC show pseudo-strain-hardening behavior and multiple-fine-cracking behavior under uniaxial tension. These types of FRCCs have been applied for the actual structures such as walls, beams, slabs and decks, tunnel linings, etc. It has been expected to extend the application of FRCCs with additional values for resilience and sustainability of structures
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