Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"steel fibers"”.
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Uniaxial and triaxial behavior of high strength concrete with and without steel fibers
… for both high strength concrete (HSC) and steel fiber reinforced high strength concrete (SFHSC). The experimental study mainly focuses on the octahedral shear stress strain relationship of those two types of concrete, which is adopted as the basis to develop a new incremental constitutive …
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Behavioral improvements in segmental concrete bridge joints through the use of steel fibers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1989.
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The effect of carbon monoxide and steam on stainless steel fiber reinforced refractory castables
The effects of stainless steel fiber additions on the resistance of castables to CO and steam were investigated. A series of high and intermediate alumina calcium-aluminate bonded castables was prepared containing several commercial stainless steel fibers. Compressive strength and abrasion …
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Effectiveness of Alternative Reinforcing Strategies for Non-Contact Hooked Bar Lap Splices
… by a lap splice which consists of longitudinal steel sticking out of each precast element and overlapped over the minimum required development length. State departments of transportation find it desirable to make the width of closure joints short. To achieve this, bridge engineers have been …
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Nondestructive characterization methods for quality control of steel fiber reinforced concrete
… on their need to nondestructively characterize steel fiber dispersion and orientation within concrete wind-tower elements in order to ensure adequate structural capacity. This thesis documents the nondestructive testing research effort. A literature review was performed and preliminary …
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Experimental Compressive Behavior and Numerical Modeling of Unconfined and Confined Ultra-High Performance Concrete
… less than 0.25 water-to-cement ratio, and fibers (mostly steel fibers).Fibers play a crucial role in enhancement of the strength and ductility of UHPC in both tension and compression. Addition of fibers make the material to fail in a fairly ductile manner in compression (compared with …
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ΣΥΜΒΟΛΗ ΣΤΗ ΒΕΛΤΙΩΣΗ ΤΗΣ ΣΕΙΣΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΕΞΩΤΕΡΙΚΩΝ ΚΟΜΒΩΝ ΠΛΑΙΣΙΩΝ ΑΠΟ Ο/Σ: αναλυτική και πειραματική έρευνα
… REINFORCING PATTERNS OFOTHER TYPES, SUCH AS STEEL FIBERS AND SEVERAL COMBINATIONS OF STEEL FIBERS, STIRRUPS AND HIGH STRENGTH CONCRETE. C. THE THIRD RESEARCH PURPOSE IS TO EXAMINE THE INFLUENCE OF THE Ρ-Δ EFFECT, THAT IS CAUSED BY THE SIMULTANEOUS CHANGE OF THE AXIAL COLUMN LOAD AND THE …
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Design and performance of cost-effective ultra-high performance concrete for prefabricated elements
… rheology incorporating lightweight sand, hybrid fibers, and nanomaterials with improved properties; (3) design prefabricated UHPC panels with fiber-reinforced polymers (FRP) for enhanced flexural properties of stay-in-place panels made with optimized UHPC; and (4) explore potential applications …
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Shear performance and behavior of long carbon fiber reinforced concrete
… of fiber reinforced concrete beams. Long carbon fibers, to be included with a traditional fresh concrete mix, were developed and their shear performance was evaluated and compared to the performance and behavior of unreinforced concrete, traditionally reinforced concrete, and fiber reinforced …
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Sustainable bacteria-based self-healing fiber reinforced concrete
… the coupling effect between bacteria and steel fiber to enhance the mechanical and physical properties at different ages has been investigated. Bacillus Sphaericus (B. Sphaericus) was incorporated into the concrete at concentrations of 2 x 109 (CFU/ml), and different bacterial percentages …
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Complete stress-strain characteristics of high performance concrete
… thus more research work is needed in this field. Steel fibers and confinements increase the ductility of high performance concrete, thus concrete does not fall even after reaching high strain value. This research presents a complete stress-strain behavior and its empirical equation of high …
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Characterization of Ultra-High Performance Concrete Tension Behavior Using Different Test Methods
… strength resulting from the presence of discrete steel fibers in its composition. Furthermore, it exhibits exceptional compressive strength and durability. These remarkable properties are a result of the optimized gradation of cementitious materials, chemical admixtures, and steel fibers that …
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Machine Learning Prediction of Shear Capacity of Steel Fiber Reinforced Concrete
The use of steel fibers for concrete reinforcement has been growing in recent years owing to the improved shear strength and post-cracking toughness imparted by fiber inclusion. Yet, there is still lack of design provisions for steel fiber-reinforced concrete (SFRC) in building codes. This is …
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Analysis of crack patterns in reinforced concrete frames under seismic excitation
… In fact, concrete reinforced with short steel fibers is associated with its ability to control cracking and enhances properties of concrete.
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Structural behavior and modeling of high-performance fiber-reinforced cementitious composites for earthquake-resistant design
… results in such a large amount of reinforcing steel that construction of the design can be congested, costly, and even impractical. This effect is particularly pronounced in critical shear and/or moment regions of structural concrete coupling beams and pile-wharf connections, as well as in …
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Residual Strength of Ultra-High Performance Concrete After Exposure to Elevated Temperatures
… offered by the manufacturer incorporates only steel-fibers to improve the tensile properties of the concrete. The enhanced mixture, which is of primary focus in the study, incorporates additional polypropylene fibers to improve the fire-resistance behavior. Specimens from each mixture were cast …
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SYNERGISTIC EFFECT OF SHRINKAGE MITIGATING STRATEGIES ON PERFORMANCE OF FIBER-REINFORCED CEMENTITIOUS COMPOSITES
… applications. HPC mixtures were prepared with steel and synthetic macro and microfibers, expansive agent (EA), and shrinkage reducing admixture (SRA) coupled with various curing methods e.g., internal curing using saturated lightweight sand (LWS) and superabsorbent polymer (SAP), and external …
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Optimization of Highway Bridge Girders for Use with Ultra-High Performance Concrete (UHPC)
… develop a durable dense matrix. The addition of steel fibers increases ductility such that the material develops usable tensile strength. The durability and strength of UHPC makes it a desirable material for the production of highway bridge girders. However, UHPC's unique constitutive materials …
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Performance of Steel Fiber-Reinforced Concrete Beams Under Shock Tube Induced Blast Loading
… focuses on the dynamic and static behavior of steel fiber-reinforced concrete (SRFC) beams. As part of this study a total of eighteen (18) beams are tested, including fourteen (14) SFRC beams, and a companion set of four (4) beams built without fibers. Seven (7) of the beams are tested under …
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Characterization and performance of eco and crack-free high-performance concrete for sustainable infrastructure
… synergy between shrinkage mitigating materials, fibers, and moist curing duration to reduce shrinkage and enhance cracking resistance; and (iii) validate performance of Eco HPCs. The composition-reaction-property correlations were developed to link the hydration kinetics of various binder systems …
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