Abstract
Ultra High Performance Fiber Reinforced Concrete (UHP-FRC) was introduced in the mid-1990s and has made striking advances in recent years. Ductal® is a UHP-FRC technology that offers a unique combination of characteristics including but, not limited to ductility, strength and durability, while providing highly moldable products with quality surfaces. Compressive strengths, and equivalent flexural strengths reach up to 200 and 40 MPa, respectively. UHP-FRC also shows an outstanding performance under dynamic loading in structures subjected to extreme loading conditions such as impact, earthquake and blast. Moreover, UHP-FRC indicates an optimized combination of properties for a specific application. Three series of tests including compression, indirect tension, and flexure were conducted under various strain rates from quasi-static to dynamic loading with low strain rates. The objective of this project is to enhance knowledge of strain rate effects on UHP-FRC with various fiber contents and to report Dynamic Increase Factor (DIF).
Highlights
The results obtained from the experiment for different cases are discussed in this chapter
Filling all the voids in matrix with tiny particles such as silica fume leads to an optimized packing density of the matrix and as a result, Ultra High Performance Fiber Reinforced Concrete (UHP-Fiber Reinforced Concretes (FRC)) has a very low permeability compared to other types of concretes such as High Performance Fiber Reinforced Cement Composites, High Strength Concrete (HSC), and Normal Strength Concrete (NSC) [9, 10]
The results have been compared to high strength concrete (HSC) and normal strength concrete (NSC). They showed that the strength of UHP-FRC is increased at high strain rates and UHP-FRC has less sensitivity to strain rate compared to HSC and NSC [50]
Summary
Concrete (UHP-FRC) was introduced in the mid-1990s. Its compressive strength exceeds 150 MPa and its flexural strength is over 30 MPa [1]. UHP-FRC includes the distinctive properties of the ultra-high performance concrete as well as high tensile strength steel fibers. UHP-FRC has many advantages including high compressive strength, durability, stiffness, ductility, toughness, freeze-thaw resistance, stability, fire resistance, tightness, corrosion resistance, energy absorption, very low permeability, aesthetic, constructability, quality control, sustainability, economic benefits, and user friendliness [3]. UHP-FRC shows an outstanding performance under dynamic loading in structures subjected to extreme loading conditions such as impact, earthquake and blast. These benefits produce great demands for designing of structures such as nuclear plants, military structures, power plants, contaminant shields, earthquake resistant structures, fuel tanks, crash barriers, and water retaining structures [4, 5]. It is hoped that this project will make UHP-FRC more accessible to the research and professional community, and remove the impression that UHP-FRC needs very specific treatment or conditions that only the experts can succeed in it
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