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Showing 1 to 20 of 22 for “"Repair materials"”.
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CHARACTERIZATION OF SENSING REPAIR MATERIALS
In order to monitor construction, repairs, and maintenance of various types of structures, it is critical to develop materials used for structural applications with sensing capabilities. In this study, polymer and cement based structural grouting materials with compressive strengths in the range of …
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Alternative patch repair materials for rebar corrosion damage
… of corrosion damaged concrete is the patch repair procedure. However, in practice this method has shown to often be unreliable as a consequence of the widespread occurrence of shrinkage cracking and poor substrate-patch adhesion leading to debonding of the patch repair. From a practical …
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Investigating the performance requirements for proprietary concrete repair materials with respect to durability and cracking resistance
… (BCOs) are the most widely used concrete repair technique. The premature failure of these overlays, often manifested by cracking and/or debonding, is common despite their widespread use. There are many repair standards, codes and technical guidelines for BCOs. The performance requirements …
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Effect of anti-corrosive coatings on the bond between corrosion-damaged rebar and concrete repair materials
… 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 and subsequently cleaned steel. It is well accepted that protective coatings offer corrosion …
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Evaluation of concrete patch repairs
… behaviour of 6 different types of generic repair materials, c) the water permeability of the above 6 types of generic repair materials, and d) the parameters which influence the adhesive strength of patch repairs. In order to evaluate the efficiency and quality of remote robotic …
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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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Geopolymer-based moisture and chloride sensors for nuclear concrete structures
… both moisture/chloride sensors and concrete repair materials. To date, monitoring and maintenance have been viewed as separate challenges. The work in this thesis demonstrates that geopolymer binders - a class of adhesive concrete repair materials - can be electrically interrogated and used …
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Deterioration of reinforced concrete in a marine environment : repair costs and maintenance strategies
… for this deterioration, and the accompanying repair costs. The costing of repair work is calculated per m2 of reinforced concrete and is based on quoted labour rates and material rates of repair materials supplied by four major suppliers in the Western Cape. Formulas are included which enable …
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Nondestructive evaluation and underwater repair of composite structures
Composite materials are gaining popularity in U.S. Naval applications because of their unparalleled strength, stiffness, and manufacturing simplicity. A better understanding of the structural integrity of these materials has the potential to reduce overdesign, decrease manufacturing cost, and …
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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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Improvised explosive device crater repair for enduring route remediation
<p>"Recent road repairs performed on main supply routes (MSRs) and alternative supply routes (ASRs) in Iraq and Afghanistan revealed several deficiencies in current repair techniques. Temporary solutions such as aggregate backfill, asphalt, and traditional concrete repairs were unacceptable due to …
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Investigative study of long-term packaging effects and donor characteristics on acellular dermis scaffolds
… grafts, engineered scaffolds, and hernia repair materials. Before tissue sources can be utilized commercially for these practices they usually are decellularized, i.e., have all cellular and nuclear material removed from the extracellular matrix (ECM), and then they are packaged in a …
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Towards performance engineered specifications for high early strength concrete pavement repair applications
Repair materials for concrete applications constitute to this day a topic of great interest for state and local transportation agencies. Repair of concrete highways is necessary whenever there is a distress area that, if not properly addressed, would propagate, ending up reducing the service life …
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Critical literature review on concrete crack repairs
… in-depth review of literature on concrete crack repairs. Deterioration of concrete affects both the aesthetics and the integrity of structures. As a result, there is need to repair such defects in order to restore the aesthetics and the integrity of concrete structures. This research discusses …
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The effect of aggregate on the age at cracking of bonded concrete overlays subjected to restrained deformation
The need for effective and comprehensive repair techniques is increasing throughout the world as existing concrete structures continue to age. The bonded concrete overlay method, where a new repair material layer is cast over an existing damaged substrate, is the most commonly utilized method of …
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Wellbore Microannulus Characterization and Seal Repair: Computational and Lab Scale Modeling
… integrity and providing zonal isolation by repairing these wellbore flaws is of critical importance to the long-term isolation of CO2 and success of CCS. This research aims to characterize the microannulus region of the cement sheath-steel casing interface in terms of its compressibility and …
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Development of an expert system for reinforced concrete bridge repair.
… 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 the …
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Development, application and early-age monitoring of fiber-reinforced ‘crack-free’ cement-based overlays
… in the construction sector will be related to repair and rehabilitation of aging infrastructure. This will require use of durable and high performance repair materials. Among various mechanisms cited for lack of durability in repairs, early-age shrinkage cracking in overlay materials is of …
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Χημική δομή και μεσοφασικές δράσεις τεσσάρων σιλανιούχων σκευασμάτων επιδιόρθωσης κεραμικών όψεων
… Control Section of the Research Center for Biomaterials, Athens Greece. Acrylic, composite or porcelain veneering of dental alloys has been for many years the choice for esthetic prosthetic restorations. Despite the development of improved materials, veneer fractures or delamination is still a …
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