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 29 for “"Rebars"”.
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Experimental investigation of bridge deck with textured epoxy-coated rebars subjected to thermal loading
… to understand better the bond behavior of TEC rebars with concrete. The experimental program presented herein focuses on studying the impact of temperature changes on the behavior of two large-scale bridge deck specimens reinforced with TEC and standard epoxy-coated (EC) bars. The results …
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Corrosion of high-chromium and conventional steels embedded in concrete
… rates of high-chromium and conventional steel rebars were compared by conducting two studies. One was with concrete blocks and the other was with bare steel rebars. In the former study, concrete blocks which had been made with two different steel rebars were placed in sodium chloride solutions …
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Étude de l'impact de l'humidité et de l'alcalinité sur des armatures de polymères renforcés de fibres (PRF)
The FRP rebars technology remains relatively recent and suffers from a bad reputation in terms of durability which slows its acceptation among the professionals of the construction field. The aim of the work presented in this essay is to study the effects of moisture and alkalinity on the …
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Strengthening historic covered bridges to carry modern traffic
… conducted to establish bond strength of GFRP rebars embedded in wood, and to establish bending strength and stiffness of large-scale beams reinforced with GFRP pultruded plates, and GFRP rebars. The GFRP rebars were developed to be used specifically as reinforcing materials for truss members, …
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Reliability model for ductile hybrid frp rebar using randomly dispersed chopped fibers
… FRP composites are used to develop reinforcing rebars in concrete structural members to replace the conventional steel, a huge benefit can be achieved since FRP materials don't corrode.</p> <p>Two FRP rebar models are proposed that make use of multiple types of fibers to achieve ductility, and …
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Bond Characteristics of Micro-Composite Multi-Structural Formable Steel Used in Reinforced Concrete Structures
… of a unique type of reinforcing steel rebars, claimed to have high corrosion resistance as well as high tensile strength, with concrete was studied. The objective was to investigate the bond behavior of straight rebars made out of this steel, named MMFX, embedded in concrete flexural …
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Evaluation of the effectiveness of deep polymer impregnation as a corrosion abatement technique for overlaid bridge decks
… primarily on corrosion of the reinforcing steel (rebars) in bridge decks. It has been estimated that over $20 billion is required to repair or rehabilitate corrosion induced deficient bridge decks and that the cost is rising at the rate of $0.5 billion annually. Corrosion occurs when there is a …
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Steel-free hybrid reinforcement system for reinforced concrete flexural members
… using continuous fiber-reinforced-polymer (FRP) rebars and discrete randomly distributed polypropylene fibers. This hybrid system may eliminate problems related to corrosion of steel reinforcement while providing requisite strength, stiffness, and desired ductility, which are shortcomings of FRP …
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GFRP reinforced concrete : environmental and movement characteristics
… In this investigation, some properties of GFRP rebars were investigated, namely flexural and compressive characteristics, bond strength with concrete with different concrete strengths, and micro-structural features such as porosity and pore size distribution using mercuryi ntrusion porosimetry( …
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Laboratory and field investigation of the performance of novel microcapsule-based self-healing concrete
… strength is limited and for this reason steel rebars are often added to create reinforced concrete (RC). Cracking inevitably occurs in all RC materials and associated structures due to a variety of mechanical and environmental actions. The generation of tiny microcracks within concrete …
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Crack detection technique for reinforced concrete bridge decks
… (b) strain in longitudinal and transverse rebars, (c) temperature gradient through the deck thickness, (d) the bending moment in the steel girders, (e) the overall contraction and expansion of concrete deck, (f) the deflection of the steel girders and (g) the opening of the joint between …
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Behavior of FRP reinforced and partially prestressed concrete members under the effects of temperature gradients
… A total of eleven RC and PPC beams using FRP rebars were tested. The test program consisted of two series; RC series and PPC series. The eleven beams had the same concrete cross-section dimensions. The RC series consisted of six beams. Three of the beams were reinforced with carbon fiber …
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Mechanical Properties of Polymer Modified Mortar
… The FRP rebar was compared to standard steel rebars, and found that the standard steel corrugated rebar had a higher adhesive strength, due to mechanical interlocking. This was clarified by measurements using a smooth steel rebar. Characterization of the polymer-modified mortar was conducted …
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Surface and Sub-Surface Analyses for Bridge Inspection
… for sub-surface bridge inspection of steel rebars. The data has been collected using Ground Penetrating Radar (GPR) sensor on real bridge decks. In this regard, a number of different approaches have been successively developed that continue to improve the state-of-the-art in this particular …
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Effects of aging on bond between FRP and concrete
… to hybrid structures. The study of using FRP rebars and wraps to reinforce our nation's existing bridge decks, beams and columns is proving that they are economical as well as future material of choice.;This research deals with the bond behavior of FRP composite wraps adhered/bonded to …
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Residual Engineering Properties of Corroded Conventional Steel, High Chromium Steel and Stainless Steel Reinforcing bars in Concrete
… strengths and ductility of the corroded steel rebars subjected to accelerated corrosion, which could also be used to evaluate the residual responses of corroded reinforcement in reinforced concrete structures in practice.
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Condition assessment of GFRP-retrofitted concrete cylinders using electromagnetic waves
… NDT), for the detection of defects, damages, and rebars in the near-surface region of glass fiber reinforced polymer (GFRP)-retrofitted concrete cylinders through the use of far-field radar measurements (electromagnetic or EM waves). In this development, two far-field monostatic ISAR (inverse …
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Robotic Inspection and Data Analytics to Localize and Visualize the Structural Defects of Civil Infrastructure
… to inspect and survey underground objects (e.g., rebars, utility pipes) in complex urban environments. In addition to GPR, visual-based surface defect detection plays a crucial role in assessing and maintaining civil infrastructure. To facilitate deployment on a robotic platform and enhance …
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Investigation of UHPC Columns for Stress-Strain Behaviour, Economic and Environmental Feasibility
… of UHPC Columns, where both Normal Steel Rebars and Prestressing Strands are considered as Steel Reinforcement. An Environmental Feasibility Analysis and an Economical Feasibility Analysis are performed comparing the Environmental and Economic Viability of a Normal Strength Concrete (NSC) …
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Service Life Assessment of Harbor Structures - Case studies of chloride ingress into concrete and sheet piling corrosion rates
… reinforcement, the passivating protection of the rebars is lost and the corrosion processes starts. When designing new concrete structures in marine environments, the only ways to increase the length of the expected service life of reinforced concrete structures are to either increase the …
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