In the past decade significant advances have been made in the field of high performance concretes. The next generation of concrete, Ultra-High Performance Concrete (UHPC), exhibits exceptional strength and durability characteristics that make it well suited for use in highway bridge structures…
Contents
CHAPTER 1 INTRODUCTION
1.1 Introduction
1.2 Objective..2
1.3 Summary of Approach
1.4 Outline of Report
CHAPTER 2 BACKGROUND AND PREVIOUS WORK
2.1 UHPC Constituent Materials
2.2 Manufacturer Supplied UHPC Material Properties
2.3 Steel Fiber Material Properties
2.4 Relevant Material Property Characterization Studies
2.4.1 Fiber Orientation Effect on Mechanical Properties by Stiel et al
2.4.2 Prestressing Strand Development Length by Steinberg and Lubbers
2.4.3 Permeability of Cracked Concrete by Rapoport et al
2.4.4 Creep and Shrinkage of UHPC by Acker
2.4.5 Abrasion Resistance of HSC via ASTM C944 by Horszczaruk
2.5 Relevant Girder Testing
2.5.1 Shear Capacity of AASHTO Type II Girders by Tawfig
2.5.2 Shear Capacity of Small UHPC Beams by Hegger et al.
2.5.3 Flexural Capacity of High Strength Concrete Girders by Rus and Burns
CHAPTER 3 UHPC MATERIAL CHARACTERIZATION
3.1 Research Plan
3.1.1 Batch and Specimen Nomenclature
3.1.2 Test Matrix
3.2 Batching, Casting, and Curing of UHPC
3.3 Compression Testing
3.3.1 Strength
3.3.2 Strength, Modulus of Elasticity, and Strain Capacity with Time
3.3.3 Linearity of UHPC Compressive Response
3.3.4 Compression Specimen Geometry
3.3.5 Demolding Age Effect on Compressive Strength
3.3.6 Long-term Delayed Steam Effect on Compressive Strength
3.3.7 Fiber Effect on Compression Failure
3.3.8 Load Rate Effect on Compression Testing Results
3.4 Tension Testing
3.4.1 Flexural Prism
3.4.1.1 Strength
3.4.1.2 Toughness
3.4.2 Split Cylinder
3.4.3 Mortar Briquette
3.4.3.1 Strength
3.4.3.2 Toughness
3.4.4 Direct Tension
3.5 Fracture Testing
3.6 Penetration Resistance Testing
3.7 Shrinkage Testing
3.7.1 Long-term Shrinkage Testing
3.7.2 Early Age Shrinkage Testing
3.8 Creep Testing
3.8.1 Long-term Creep Testing
3.8.2 Early Age High Stress Creep Testing
3.9 Coefficient of Thermal Expansion
3.10 Heat of Hydration
3.11 Air Void Testing
3.12 Steel Fiber Dispersion Testing
3.13 Durability Testing
3.13.1 Rapid Chloride Ion Penetrability Testing
3.13.2 Chloride Penetration
3.13.3 Scaling Resistance
3.13.4 Abrasion Resistance
3.13.5 Freeze-Thaw Resistance
3.13.6 Alkali-Silica Reaction
3.14 Split Cylinder Tension Testing on Cracked Cylinders
CHAPTER 4 GIRDER MATERIAL PROPERTIES
4.1 Test Specimen Casting, Harvesting, and Preparation
4.2 UHPC Compression Testing
4.3 UHPC Flexural Prism Testing
CHAPTER 5 GIRDER FABRICATION AND EXPERIMENTAL METHODS
5.1 Girder Fabrication
5.2 Test Matrix
5.3 Test Setup and Specimen Details
5.4 Instrumentation
5.4.1 Girder 80F
5.4.2 Girder 28S
5.4.3 Girder 24S
5.4.4 Girder 14S
5.5 Loading Procedure
CHAPTER 6 UHPC GIRDER TESTING RESULTS
6.1 Static Flexural Testing
6.2 Static Shear Testing
6.2.1 Girder 28S
6.2.2 Girder 24S
6.2.3 Girder 14S
CHAPTER 7 DISCUSSION OF RESULTS
7.1 Tensile Behavior of UHPC
7.1.1 Summary of Experimental Results
7.1.2 Summary of Experimental Test Methods
7.2 Local and Global Mechanical Failure Modes of UHPC
7.3 Effect of Curing Procedure on UHPC Properties
7.4 Early Age Strength Gain of UHPC
7.5 Comparison of Cylinder and Cube Compression Strength Results
7.7 Shrinkage Behavior of UHPC
7.8 Long-term Stability of UHPC
7.9 Modulus of Elasticity of UHPC
7.10 Compressive Stress-Strain Behavior of UHPC
7.11 Development Length of Prestressing Strand in UHPC
7.12 Estimation of Prestress Losses in UHPC Girders
7.13 Flexural Behavior of Prestressed UHPC Girders
7.13.1 Analytical Predictions of Global Behavior
7.13.2 Cracking Behavior
7.13.3 Effective Moment of Inertia
7.13.4 Flexural Stiffness Under Flexural Loading
7.13.5 Uniaxial Stress-Strain Model of Girder Flexural Behavior
7.14 Shear Behavior of Prestressed UHPC Girders Containing No Mild Steel
7.14.1 Predicted vs. Actual Global Behavior
7.14.2 Cracking Behavior
7.14.3 Simplified Model of UHPC Girder Shear Failure
7.14.4 Strut-and-Tie Model of Girder 28S Failure
CHAPTER 8 DESIGN PHILOSOPHY FOR UHPC BRIDGE GIRDERS
8.1 Introduction
8.2 Flexure
8.3 Shear
CHAPTER 9 : CONCLUSIONS AND FUTURE RESEARCH
9.1 Introduction
9.2 Conclusions
9.2.1 General
9.2.2 Highway Bridge Girders
9.2.3 Material Property Characterization
9.3 Ongoing and Future Research
REFERENCES
Author: Graybeal, Benjamin Allen
Source: University of Maryland
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