Abstract
By optimizing the distribution of steel fibers in fiber-reinforced cementitious mortar (FRCM) through the layered structure, the role of fibers can be fully utilized, thus improving the flexural behavior. In this study, the flexural behavior of layered FRCM at different thicknesses (25 mm, 50 mm, 75 mm, 100 mm) of the steel fiber layer was investigated. The evolution of the crack propagation behavior was analyzed using the digital image correlation (DIC) technique. The results showed that the steel fiber layer thickness of 75 mm has the best flexural behavior. Moreover, the crack propagation path is more tortuous. The maximum value of crack opening displacement (COM) increases with the increase in fiber thickness. In addition, increasing the bottom layer thickness can increase the height of the tensile zone, but the interface inhibits the increase of the tensile zone.
Highlights
Fiber-reinforced cementitious mortar (FRCM) has attracted increasing attention due to its high strength, excellent flexural behavior, and crack control ability [1,2,3]
Loading direction is perpendicular to the interface
FRCM beams are designed in layers with different thicknesses
Summary
Fiber-reinforced cementitious mortar (FRCM) has attracted increasing attention due to its high strength, excellent flexural behavior, and crack control ability [1,2,3]. The high cost of raw materials for FRCM limits its widespread use in the engineering field [4,5]. To expand the application of FRCM, reducing its raw material cost has become an important research subject in this field. Using low-cost fillers and aggregates to prepare a FRCM matrix can reduce its raw material costs. Many scholars [10,11,12] have reported that the use of low-cost aggregates to prepare FRCM can reduce the cost without a significant loss of strength. The high cost of steel fibers is a factor that cannot be ignored
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