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 16 of 16 for “"cover depths"”.
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The Role of Earth Cover Depths and Upward Acid Diffusion on The Survival and Distribution of Vegetation on Coal Refuse Piles
Made available in DSpace on 2014-12-14T14:37:17Z (GMT). No. of bitstreams: 1 7606981.pdf: 5142330 bytes, checksum: 3b5e7e2fbeba92b48b23c1aba276b148 (MD5) Previous issue date: 1975
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Subsidence Cracking of Concrete Over Steel Reinforcement Bar in Bridge Decks
… 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 reinforcement, cement type and bar spacing may have on the …
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Service life extension of reinforced concrete structures using hydrophobic impregnation
… to insufficient quality and quantity of cover concrete resulting from inadequate mix design and poor onsite workmanship respectively. Engineers also often lack understanding of concrete durability and prescribe insufficient cover depths relative to the exposure conditions. Concrete …
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Corrosion Testing and Modeling of Chloride-Induced Corrosion Deterioration of Concrete Bridge Decks
… linear polarization, reinforcement cover depths, chloride samples. The Virginia bridge deck was built with epoxy-coated reinforcement as top reinforcement mat and black bar as the bottom mat. The Florida bridge is a segmental prestressed box girder structure built with black bar. The …
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Modeling the Time-to Corrosion Cracking of the Cover Concrete in Chloride Contaminated Reinforced Concrete Structures
… seven admixed chloride contents, three concrete cover depths, two reinforcing steel bar diameters, two exposure conditions, and a typical concrete with water to cement ratio of 0.45. Corrosion current density (corrosion rate), corrosion potential, ohmic resistance of concrete and temperature were …
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Effect of Environmental Conditions and Structural Design on Linear Cracking in Virginia Bridge Decks
… M.C., 2002). Since linear cracking in concrete cover can potentially accelerate chloride ingress to the depth of the reinforcing steel, there is reason to believe that severity of deck cracking can significantly influence the time to first repair and/or rehabilitation of the bridge deck. Surface …
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Correlation of corrosion measurements and bridge conditions with NBIS deck rating
… application by the field inspectors. Clear cover depths, resistance, corrosion potentials, linear polarization data, as well as environmental exposure and structural data were collected from a sample of 38 bridge decks in the Commonwealth of Virginia. These structures were further divided in …
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Ground movements during tunnelling in sand
… Tests were preformed at four different burial depths in dry sand, corresponding to cover depths of 0.5, 1, 1.5, and 2 times the tunnel diameter. These results indicate that the face pressure at failure is largely independent of burial depth over the values tested. The ground deformation at the …
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Investigation of Culvert Joints Employing Large Scale Tests and Numerical Simulations
… experiments evaluate the influence of different cover depths, loading locations, and installation conditions on the response of the joints. Additionally, the performance of each joint when the pipeline was buried with shallow cover and subjected to surface loads up to and beyond fully factored …
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Effect of oxygen availability on the corrosion rate of reinforced concrete in marine exposure zones: inference from site and lab studies
… on a structure where both zones have the same cover to reinforcing, the splash and spray zone will show significant damage while the tidal zone shows no signs of reinforcement corrosion. These findings challenge the existing idea that the tidal zone can be characterised as the most severe …
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The influence of various factors on the results of carbonation, cover depth, half-cell potential and resistivity tests that are used in the assessment of reinforcement corrosion
… tests, namely the half-cell potential (HCP), cover depth, carbonation and resistivity tests was performed on several concrete structures on upper campus at UCT. The half-cell potential and resistivity tests were carried out across a four-month period between August and November 2018 during …
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Evaluation of Strength and Hydraulic Properties of Buried Pipe Systems Used for Stormwater Harvesting
… effects of dead and live loads. Three different cover configuration were studied ranging from 18 inches to 43 inches of depth. Draw-wire sensors, a type of displacement sensors, were placed inside buried housing structures to monitor deformation values experienced by the pipe bundles during the …
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Sensitivity of Half-Cell Potential Measurements to Properties of Concrete Bridge Decks
… effects of age, chloride concentration, concrete cover thickness, spatial position, temperature, and presence or condition of epoxy coating on half-cell potential measurements of concrete bridge decks typical of those in Utah. The laboratory testing associated with this research followed a …
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Durability Assessment and Service Life Prediction of Concrete in Extreme Aggressive Environment
… were 5 identified for different concrete cover depths. For instance, an SR threshold of 48.86 kΩ-cm and BR threshold of 22.21 kΩ-cm were determined for a 2.5-inch cover depth. The implications of this research are profound for the construction industry, particularly for regions with high …
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The development of empirical chloride-induced corrosion rate prediction models for cracked and uncracked steel reinforced concrete structures in the marine tidal zone
… variables were pre-corrosion flexural cover cracking, cover depth and concrete quality (binder type and w/b ratio). Corrosion rate, half-cell potential and concrete resistivity were monitored bi-weekly throughout the experimental period. The experimental results show that even though …
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An analysis of the impact of chloride-induced corrosion on reinforced concrete structures in the port of Cape Town
… relationship between marine exposure conditions, cover depths, age, and deterioration due to chloride-induced corrosion in the port of Cape Town through the investigation of select structures. As-built data collection, visual condition assessments, and cover measurements were performed on various …