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 “"Deicing Salts"”.
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EFFECTS OF DEICING SALTS ON THE DURABILITY OF CONCRETE INCORPORATING SUPPLEMENTARY CEMENTITIOUS MATERIALS
… while exposed to solutions of one of the three deicing salts or deionized water in which the temperature of the specimens ranged from 39.2 ºF (4 ºC) during the wetting cycle to 73 ± 3 ºF (23 ± 2 ºC) during the drying cycle. Of special interest were the effects of CaCl2 and MgCl2, which result in …
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A reexamination of stratification processes in Ides Cove, N.Y. with reference to sediment geochemistry
… being attributed to the heavy application of deicing salts in the cove's watershed. Application of deicing salts to roads in the Town of Irondequoit has steadily declined from 31,230 metric tons in 1970-71 to 3,981 tons in 1979-80. Salt concentrations in surface waters of the cove have …
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Evaluation of the effectiveness of deep polymer impregnation as a corrosion abatement technique for overlaid bridge decks
… principal source of chloride ions is from the deicing salts applied on the decks during winter. More than 9 million tons of deicing salts are consumed each year in the U.S.A. As corrosion products have a larger volume than steel, corrosion causes cracking and spalling of the deck. Concrete …
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Subsidence Cracking of Concrete Over Steel Reinforcement Bar in Bridge Decks
… salt laden environments. Chlorides from either deicing salts or marine environments 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 …
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Verifying the Calcium Oxychloride Threshold in Cementitious Pastes
… chloride (CaCl2) or magnesium chloride (MgCl) deicing salts and calcium hydroxide in the cementitious matrix. Currently, the accepted CAOXY threshold at which deterioration is mitigated in cementitious paste is 15 g/100 g paste (15 oz/100 oz paste); however, this limit was developed using …
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Chloride Penetration Resistance and link to Service Life Design of Virginia Bridge Decks
… (RC) bridge decks are exposed to chlorides from deicing salts. Chloride 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 …
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Chemical treatment of corroding steel reinforcement after removal of chloride contaminated concrete
The increasing use of deicing salts has caused the accelerated deterioration of bridge decks due to cracking and spalling from chloride induced corrosion of steel reinforcement. One method being considered as a possible corrosion abatement measure is the removal of chloride contaminated concrete …
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Modeling the Time to Corrosion Initiation for Concretes with Mineral Admixtures and/or Corrosion Inhibitors in Chloride-Laden Environments
… located in the coastal region or inland where deicing salts are used. The exposure conditions were horizontal, vertical, tidal, and immersed zones. The specimens were kept inside the laboratory and were exposed to weekly ponding cycles of 6% (w/w) sodium chloride solution. In addition, cover …
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Corrosion Assessment for Failed Bridge Deck Closure Pour
… this is due to chloride attack present in deicing salts which causes the reinforcing steel to corrode. Different solutions have been developed and used in practice to delay and prevent corrosion initiation. The purpose of this research is to investigate the influence of corrosion on the …
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Effects of Surface Condition and Environmental Exposure on the Bond between CFRP and Steel
… when exposed to aggressive environments and deicing salts. The conventional methods for repairing steel structures can be labor-intensive and time-consuming, and add considerable weight to the existing structure. One alternative is utilizing carbon fiber reinforced polymers (CFRP). Many …
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Entrained Air-Void System For Durable Highway Concrete
… changing the freezing solution to incorporate deicing salts, 3- A combination of modification approaches including application of a concentrated pre-storm brine followed by drying.The F-T research was performed in three phases. The first phase involved calibration and modification of the AASHTO …
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Condition Analysis of Concrete Bridge Decks in Utah
… cycles and the routine application of deicing salts during winter maintenance activities. Given the need for increasingly cost-effective strategies for bridge deck maintenance, rehabilitation, and replacement (MR&R), the Utah Department of Transportation (UDOT) initiated this research …
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Experimental Investigations of Residual Strength and Repaired Strength of Corrosion Damaged Prestressed Bridge Beams
… bridges in Virginia, due to the frequent use of deicing salts during the winter, as well as the number of structures in marine environments. The residual capacity of corrosion damaged prestressed I-beams and box beams needs to be accurately estimated to determine if damaged bridges need to be …
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Saturated–Unsaturated behaviour of compacted clays
… (drought, flood, and freezing), contaminations (deicing salts, ion-rich slurries, and toxic leachates), and applied stresses (self-weight, vehicular traffic, and heavy equipment), thereby affecting the integrity of civil infrastructures. The geotechnical behavior (flow through, volume change, and …
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Quantifying factors that influence road deicer retention and export in a multi-landuse Upstate New York watershed
… particularly in northern latitudes where deicing salts are applied to roadways. This study determined how deicer impacted runoff disperses through sub-urban and urban areas on seasonal and multi-year scales. Chloride concentration changes were then modelled under varying pollutant loading …
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Investigation of parameters governing the corrosion protection efficacy of fusion bonded epoxy coatings
… chlorides which are applied to bridge decks as deicing salts. The direct cost of corrosion damage to the country's infrastructure is approximately $8.3 billion per year. One of the most common corrosion abatement methods in the United States is the barrier protection implemented through the …
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Effect of Severe Corrosion on Lateral Strength of Square RC Bridge Columns
… obsolete. Corrosion damage caused by deicing salts is considered one of the main problems that cause a bridge structure to be structurally deficient (FHWA, 2004). However, absence of a practical model for assessment of the residual lateral strength of severely corroded RC columns as …
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Effect of Stay-in-Place Metal Forms on Performance of Concrete Bridge Decks
… treatments, including applications of deicing salts during winter months. All of the tested decks were constructed between 1984 and 1989 using epoxy-coated rebar. Several tests were performed at each of six locations on each deck, including visual inspection, chain dragging, hammer …
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Computational Simulation of Chloride-Induced Corrosion Damage in Prestressed Concrete Bridge Girders
… bars, which is commonly caused by the use of deicing salts on the deck or saltwater spray in coastal regions. The present study aims at establishing analytical tools for the accurate simulation of chloride ingress, corrosion and mechanical damage (cracking) in the concrete, and for the …
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The Development and Optimization of Raman Spectroscopy Analyses for Mobile Salinity Sensing
To quantify the amount of deicing salt on the roadway in near-real time, this thesis proposes a mobile salinity sensor using Raman spectroscopy. This thesis investigates the viability of using Raman spectroscopy to determine the concentration of salt deicer in an aqueous solution in near-real time …
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