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]

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Summary

Overview Ultra High Performance Fiber Reinforced

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

Research Methodology
Project Outline
Ultra High Performance Fiber Reinforced Concrete (UHP-FRC)
Advantages of UHP-FRC
Application of UHP-FRC
UHP-FRC Material Constituents
Mixing and Casting
Influence of Mix Parameters on Compressive Strength (f′c)
Type of Cement (C)
Type of Silica Fume (SF)
Powder Proportion
Influence of Type and Amount of HRWR
Fiber Content
Compressive Strength
Compressive Strength Test
Indirect Tensile Strength Test (Splitting Test or Brazilian Test)
Modulus of Rupture (fr) Test
Modulus of
Dynamic Properties of UHP-FRC
Strain Rate Response of Concrete
Strain Rate Effects on the Strength of Concrete
Dynamic Increase Factor (DIF)
Strain Rate Properties of Concrete in Compression
Strain Rate Properties of Concrete in Tension
Comparison of the Strain Rate Responses of Concrete in Compression and Tension
Direct Tension Test
Indirect Tensile Strength Test (Splitting Test or Brazilian Test) The
Split Hopkinson Pressure Bar (SHPB)
Tension Testing Using SHPB
Drop Hammer Impact Test
U of T Drop Hammer Impact Test
RMIT Drop Hammer Impact Test
UHP-FRC with Steel Fibers at 1% by Volume fraction
UHP-FRC with Steel Fibers at 2% by Volume fraction
Mixing Procedure
Casting and Curing
Compressive Strength Test under Quasi Static and Dynamic Loading
Indirect Tensile Strength Test
Flexural Strength Test
Flexural Strength Test under Dynamic (Impact) Loading
RU Drop Hammer Impact Test System
Drop Hammer Weight
Circular Electric Lifting Magnet
Load Cells
Accelerometers
Data Acquisition System
Introduction
Stress-Strain Behavior
Compressive Strength Test under Quasi-Static Loading
Compressive Strength Test under Dynamic Loading
Flexural Strength Test under Quasi-Static and Low Speed Loading Rates
Impact Test
Result Analysis and Discussion
Chapter 5 CONCLUSIONS
Research Findings
Recommendation for Future Work
Full Text
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