Abstract
Conventional concrete is a brittle material with a very low tensile strength as a result of compressive strength and tensile strain. In this study, the flexural behavior characteristics of slurry-infiltrated fiber-reinforced cementitious composites (SIFRCCs) based on slurry-infiltrated fiber concrete (SIFCON), such as high-performance fiber-reinforced cementitious composites (HPFRCCs), were analyzed to maximize the fiber volume fraction and increase resistance to loads with very short working times (such as explosions or impacts). For extensive experimental variables, one fiber aspect ratio and three fiber volume fractions (6%, 5%, and 4%) were designed, and the flexural toughness and strength were figured out with respect to variables. A maximum flexural strength of 45 MPa was presented for a fiber volume fraction of 6%, and it was found that by increasing the fiber volume fraction the flexural strength and toughness increased. The test results with respect to fiber volume fraction revealed that after the initial crack, the load of SIFRCCs frequently increased because of the high fiber volume fraction. In addition to maximum strength, acceptable strength was found, which could have a positive effect on brittle fractures in structures where an accidental load is applied (such as an impact or explosion).
Highlights
Conventional concrete is a brittle material with a low tensile strength as a result of compressive strength and tensile strain
This study develops a slurry-infiltrated fiber-reinforced cementitious composite (SIFRCCs) that can maximize flexural tensile strength and energy absorption by maximizing the amount of steel fibers needed to increase resistance to very short working loads such as explosions or shocks
The flexural behavior characteristics of slurry-infiltrated fiber-reinforced cementitious composites (SIFRCCs) were analyzed with respect to variations in fiber volume fraction used to improve the resistance performance of reinforced concrete (RC) structures to unexpected loads such as explosions or impacts
Summary
Conventional concrete is a brittle material with a low tensile strength as a result of compressive strength and tensile strain. To prevent the brittle fracturing of concrete materials while improving tensile behavior and energy dissipation capacity, high-performance fiber-reinforced cementitious composites (HPFRCCs) has been actively researched [1,2,3,4,5,6]. Owing to the recent rapid development of construction technology, structures are becoming larger, higher, and longer, and the functions of structures are becoming more diversified and complicated, resulting in an increasing trend of unexpected loads such as explosions and fires [1,2,3,9,10]. This study develops a slurry-infiltrated fiber-reinforced cementitious composite (SIFRCCs) that can maximize flexural tensile strength and energy absorption by maximizing the amount of steel fibers needed to increase resistance to very short working loads such as explosions or shocks. This study analyzes flexural behavior characteristics in respect to steel fiber volume fractions, considering fiber volume fraction of 4%, 5% and 6%
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