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 22 for “"concrete repair"”.
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Assessing the age at cracking of concrete repair mortars
The amount of concrete infrastructure needing repair and rehabilitation is increasing worldwide. The bonded overlay technique, which involves removal- of a damaged concrete layer on an existing concrete base (substrate) and replacing it with a new layer is one of the most widely used techniques. …
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Investigating the performance requirements for proprietary concrete repair materials with respect to durability and cracking resistance
… premature deterioration of recently constructed concrete structures leads to the need for remedial measures to reinstate their safety and/or serviceability. Bonded concrete overlays (BCOs) are the most widely used concrete repair technique. The premature failure of these overlays, often …
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Effect of anti-corrosive coatings on the bond between corrosion-damaged rebar and concrete repair materials
… which in turn affects the bond between steel and concrete and consequently the structural performance of reinforced concrete structures. During a repair strategy, when the patch repair method is considered, one of the steps usually involves the application of a protective coating to the corroded …
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Review of current practices to reduce reinforcement corrosion in concrete structures managed by the City of Cape Town
The repair and maintenance of ageing reinforced concrete (RC) structures has become increasingly costly, especially in the Cape Peninsula. Protection and maintenance of these reinforced concrete structures against concrete deterioration and rebar corrosion have become far more important for road …
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Geopolymer-based moisture and chloride sensors for nuclear concrete structures
The reinforced concrete structures that support transport, energy and urban networks in developed countries are over half a century old, and are facing widespread deterioration. The main cause of degradation - reinforcement corrosion, accelerated by moisture and chloride exposure - costs the global …
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Development of an expert system for reinforced concrete bridge repair.
Current techniques for selecting reinforced concrete repair materials are often based on ad-hoc methods for specifying repair material properties. The inherent lack of understanding of material behaviour in this approach can lead to premature failure of repairs.This research has examined state of …
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Investigation of strength of a hybrid adhesive anchor system used in precast concrete welded repair applications subjected to tensile and eccentric shear loading
A common precast industry repair for missing or misplaced connection plates is the use of an adhesive anchor system to fasten repair plates to precast members. Typically, the repair plate will experience elevated temperatures during the welding of the loose erection plate to the repair plate. …
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Discrete sacrificial anodes and their use in service life extension of chloride contaminated reinforced concrete structures
… urgent need for economic and technically sound concrete repair technologies in South Africa as the number of deteriorating RC structures needing repair is increasing. Currently, the South African concrete repair industry mainly relies on the application of patch repairs and corrosion inhibitors …
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Repair and rehabilitation of reinforced concrete harbour structures
Damage to reinforced concrete infrastructure due to chloride-induced corrosion is widespread throughout the marine environment in South Africa. This thesis is an investigation into four current concrete repair contracts at harbours in the Western Cape. The works are critiqued in terms of repair …
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Effectiveness of high strength repair mortars in structural patch repairs of concrete members under axial compression
… research into the performance and efficacy of repair materials used in structural concrete patch repair applications. The repercussions of this have led to the development of repair standards and guidelines that fail to adequately cover requirements for structural repair, often poor repair …
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The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays
The concrete repair industry is driven by deterioration of, damage to, and defects in concrete structures. The impact of deterioration or damage is a reduction in the service life of the concrete structure. One of the common methods used to repair and rehabilitate damaged concrete structures is the …
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Durable high early strength concrete
… Furthermore, reconstruction of a two-lane concrete pavement costs between $0.8 and $1.15 million dollars per lane mile. High early strength Portland cement concrete pavement (PCCP) patches are widely used in pavement preservation in Kansas due to the ability to open to traffic early. …
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Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars
… restrained shrinkage cracking in non-structural concrete patch repair mortars (PRMs). This dearth of information makes the design and development of PRMs with improved resistance to cracking challenging. The problem is further compounded by the fact that the existing code of practice for concrete …
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Epoxy-Based, Rapid Setting Polymer Concretes for use in Military Airfield Repairs
When damaged, military airfields must be repaired quickly so that flying operations can resume. Due to their rapid-setting and high-strength properties, epoxy-based polymer concretes (PC) may provide a good alternative to the portland cement concrete (PCC) rapid repair mixes currently used by the …
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Assessment and prediction of chloride ingress and carbonation in patch repair mortars
The specifications for concrete patch repair mortars usually entail mechanical properties such as compressive strength and tensile strength. However, these properties may not directly relate to the desired performance in relation to durability and prevention of reinforcement corrosion. In addition, …
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Repair of Impact-Damaged Prestressed Bridge Girders Using Strand Splices and Fiber-Reinforced Polymer
… is part of a VDOT sponsored project focusing on repair techniques for impact damaged prestressed bridge girders. The investigation included evaluation of the repair installation and flexural strength of four AASHTO Type III girders that were intentionally damaged and repaired. In addition, …
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Analytical Modeling of the Repair Impact-Damaged Prestressed Concrete Bridge Girders
… collisions. The increasing number of prestressed concrete bridges indicates that the probability of such bridges being impacted by overheight vehicles has increased. This thesis, sponsored by the Virginia Center for Transportation Innovation and Research (VCTIR), investigated three repair …
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Durability of Cementitious Materials in Arctic Regions: Investigating Freeze-Thaw Damage and Chloride Ingress Diffusion Mechanisms
Concrete infrastructure in the Arctic coastal region faces durability challenges from freeze-thaw (F-T) cycles and chloride ingress due to seawater and deicing salts, resulting in surface scaling, spalling, and cracking. Climate change exacerbates these issues, particularly in high-latitude areas …
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Literature review of the use of common protective coatings for concrete structures with experiences in the South African context
… With a vast amount of deteriorating reinforced concrete structures and fast developing technology of surface treatments, it is important that engineers have a good working understanding of concrete deterioration, repair and the use of surface protection systems. Additionally, engineers need to …
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Effect of Surface Moisture Condition on Substrate-Repair Concrete Overlay Transition Zone
Concrete is the most widely used construction material in the world. Given its relative availability, strength, economy, and versatility to fit various applications, the material has been incorporated in roadways, bridges, buildings, and a host of other infrastructure projects. Oftentimes, concrete …
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