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Showing 1 to 20 of 106 for “"reinforcing steel"”.
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Field Performance of Epoxy-Coated Reinforcing Steel in Virginia Bridge Decks
… corrosion protection performance of epoxy-coated reinforcing steel (ECR) was evaluated in 18 concrete bridge decks in Virginia in 1997. The decks were 2 to 20 years old at the time of the investigation. The concrete bridge deck inspections included crack survey and cover depth determination in the …
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Influence of Bridge Deck Concrete Parameters on the Reinforcing Steel Corrosion
Chloride induced corrosion of steel in concrete is one of the major forms of deterioration mechanisms found in reinforced concrete bridges. Early age corrosion damage reduces the lifespan of the bridges, which results in heavy economic losses. Research has been conducted to identify economic …
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Phosphate-doped borosilicate enamel coating used to protect reinforcing steel from corrosion
… coatings to provide corrosion protection for reinforcing steel in concrete. Phosphates have low solubilities in borosilicate glasses, generally less than about 4 mol%, and are incorporated mainly as isolated PO<sub>4</sub><sup>3-</sup> and P<sub>2</sub>O<sub>7</sub><sup>4-</sup> anions, along …
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Influence of Reinforcing Steel Parameters on the Formation of the Passive Layer
… study, twenty-seven specimens were cast with reinforcing steel to represent reinforcing mats at the top and bottom of each specimen. Top and bottom spacing arrangements were approximately 51, 76, 102 mm (2, 3, and 4-inches), cathode-to-anode bar (C/A) ratios were 2 and 1, and the presence and …
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Flexural Resistance Factors for Partially Prestressed Members Using ASTM A 1035 Reinforcing Steel
<p>The current standard reinforcing steel used in reinforced concrete beams in the United States is ASTM A615, Grade 60. However, several high-strength reinforcing bars are now available. These bars are believed to offer better performance in reinforced and prestressed concrete beams. The current …
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The influence of binder type and cracking on reinforcing steel corrosion in concrete
… on the corrosion characteristics of embedded steel in concrete. The investigation was limited to those materials commonly used in South Africa (slag, fly ash,and condensed silica fume) and performed under laboratory conditions at 30°C.
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Corrosion Protection Service Life of Epoxy Coated Reinforcing Steel in Virginia Bridge Decks
… ECR, 10 to 12 cores were drilled through a top reinforcing bar adjacent to the previous study core locations. In addition, approximately 3 cores were drilled through a top reinforcing bar at a surface crack location. Laboratory testing involved nondestructive monitoring using advanced …
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The effects of elevated temperature on the bond between concrete and reinforcing steel bars
… bond are discussed. These are properties of the steel reinforcing bar, properties of the concrete, embedment length, casting position of the reinforcing bar and temperature. The research reported herein is primarily concerned with the effects of elevated temperature on the bond between concrete …
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Accelerated Alkali-Silica Reaction and Corrosion of Reinforcing Steel in Concrete: Application on Dry Casks
The durability is one of the main reasons making concrete the most abundantly consumed material in the world after water. However, severe exposure conditions and improper or low quality mixture designs can cause physical and chemical changes in concrete which lead to deterioration and premature …
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Experimental Studies of Reinforcing Steel and Shape Memory Alloys in Mechanically Spliced Connections for Seismic Application
… with the potential application of mechanical reinforcing bar splices for use in the plastic hinge of a bridge column for use in accelerated bridge construction (ABC). The implementation of couplers in a plastic hinge for ABC is not unique, however coupler application has been limited to …
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Parameters Influencing the Corrosion Protection Service Life of Epoxy Coated Reinforcing Steel in Virginia Bridge Decks
This study is an evaluation of epoxy coated reinforcing steel (ECR) and its ability to effectively provide corrosion protection in reinforced concrete highway bridge decks. An analysis was conducted on 10 bridge decks built in the state of Virginia between the years 1981 and 1995. A total of 141 …
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Influence of Nozzle Pressure, Standoff Distance, and Reinforcing Steel Cage on Water Jetting of CIDH Pile Anomalies
… objectives of this research were to examine how reinforcing steel influences water jetting and to evaluate how jetting pressures and standoff distance from the material surface affect water jetting of concrete type materials and PVC tubing. The experimental work consisted of water blasting …
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Performance Evaluation of Epoxy-Coated Reinforcing Steel and Corrosion Inhibitors in a Simulated Concrete Pore Water Solution
Three epoxy-coated reinforcing steel (ECR) types removed from job sites, one shipped directly from the coater's plant, three commercial corrosion inhibitors, and one ECR plus a corrosion inhibitor were evaluated as reinforcing steel corrosion protection systems against chloride induced corrosion. …
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Development of a Magnetic Field Sensor System for Nondestructive Evaluation of Reinforcing Steel in Prestressed Concrete Bridge Members
… system for inspection of prestressed steel in concrete. A computer aided simulation model was created to model the magnetic field signals and aid in better understanding of the electromagnet-sensor. This model is also useful for generating expected magnetic field signals from …
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Subsidence Cracking of Concrete Over Steel Reinforcement Bar in Bridge Decks
… may cause chloride-induced corrosion of the reinforcing steel resulting in spalling of the cover concrete. Concrete specimens with 16 mm (# 5) diameter bars were cast with various cover depths, bar spacing and two concrete mixture types to determine the influence that epoxy coated …
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Sensitivity of Half-Cell Potential Measurements to Properties of Concrete Bridge Decks
… method for assessing the corrosion potential of reinforcing steel in concrete bridge decks. The technique is particularly useful because it can be utilized to evaluate the probability of corrosion before damage is evident at the surface of a bridge deck. The specific objective of this research …
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A Load-Deflection Study of Fiber-Reinforced Plastics as Reinforcement in Concrete Bridge Decks
… decks is due primarily to corrosion of the reinforcing steel in the concrete. A promising solution to the problem is the use of fiber reinforced plastics (FRP) as a replacement for reinforcing steel. The use of FRP as reinforcement has the following advantages of lightweight, high tensile …
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Corrosion Assessment for Failed Bridge Deck Closure Pour
Corrosion of reinforcing steel in concrete is a significant problem around the world. In the United States, there are approximately 600,000 bridges. From those bridges 24% are considered structurally deficient or functionally obsolete based on the latest, December 2010, statistic from the Federal …
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Chloride Penetration Resistance and link to Service Life Design of Virginia Bridge Decks
… ingress in RC initiates corrosion of the reinforcing steel. The high costs of corrosion have sparked interest in service life design of bridge decks. This thesis characterized the exposure conditions of Virginia, including temperature and surface chloride concentration, as well as Virginia …
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