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 “"freeze-thaw cycling"”.
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Environmental durability of FRP bond to concrete subjected to freeze-thaw action
… and concrete. The study specifically focused on freeze-thaw cycling exposure of such bonds and their ultimate strength prior and after the environmental exposure. To investigate the bond strength 84 single lap shear specimens were manufactured utilizing two different types of carbon FRP pultrued …
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The Effect of Asphalt Concrete Overlays on The Progression of Durability Cracking in Portland Cement Concrete (d-Cracking, Frost, Freeze-Thaw, Autogenous Healing)
… concrete (PCC) and is normally caused by winter freeze-thaw cycling. The PCC coarse aggregate source has been identified as causing well designed mixes to develop D-cracking.
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The Effects of Vegetation on Stream Bank Erosion
… as compared to herbaceous vegetation, winter freeze-thaw cycling was greater. As a result, in silty soils that were susceptible to freeze-thaw cycling, the beneficial effects of root reinforcement by woody vegetation were offset by increased freeze-thaw cycling. Using the study results in an …
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Characterization of Recycled Concrete for use as Pavement Base Material
… compressive strength (UCS), stiffness, freeze-thaw cycling, moisture susceptibility, abrasion, salinity, and alkalinity evaluations. Non-destructive testing was utilized in the field to monitor seasonal variation in stiffness of an RCM pavement base layer over a 1-year period. The …
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Changes in Streambank Erodibility and Critical Shear Stress Due to Surface Subaerial Processes
… influenced by weathering processes such as freeze-thaw cycling and wet-dry cycling. Despite over forty years of research attributing changes in soil properties over time to climate-dependent variables, little quantitative information is available on the relationships between streambank …
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Impact of Freeze-Thaw Cycles on Porosity Change in Shalles and Its Implications on Erodibility
… objective of this thesis is to understand how freeze-thaw cycles affect the hydraulic conductivity and porosity of shales over time. This research focuses on predicting degradation due to freeze-thaw cycles, which alter porosity, reduce strength, and increase erosion susceptibility. Shale …
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Mechanical characterization of aged recycled polymers and applications
… characterization was carried out at freeze-thaw cycling aging. It was found that recycled polymers retain at least 70% of their tensile, bending and compressive strength after 18 months of aging under harsh environment (60 years in practice).;Offset block modules for highway guardrail …
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Effect of manufacturing process conditions on the durability of pultruded vinyl ester/glass composites
… not been stressed while immersed at 85°C. Freeze-thaw cycling had no effect on the strength. DMTA analysis showed that an increase in glass transition temperature, Tg, occurred with increased aging temperature, indicating additional cross-linking had occurred. However, results showed that …
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Evaluation of Laboratory Durability Tests for Stabilized Aggregate Base Materials
… Specimens were tested for durability using the freeze-thaw test, the vacuum saturation test, and the tube suction test. Analyses of the test results indicated that the unconfined compressive strength (UCS) and retained UCS were higher for specimens tested in freeze-thaw cycling than the …
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Evaluation of Laboratory Durability Tests for Stabilized Subgrade Soils
… tests used in this comparative study were the freeze-thaw test, the vacuum saturation test, and the tube suction test. On average, to achieve the same 7-day unconfined compressive strength (UCS) values, the sand required 4.4 times more Class C fly ash than cement, 3.6 times more lime-fly ash …
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Comparative Evaluation of Field and Laboratory-Produced Foamed Asphalt Mixture from Reno, Nevada
… tensile strength as a function of multiple freeze-thaw cycling. The resistance of the mixtures to permanent deformation was evaluated through the use of the repeated load triaxial (RLT) to measure the flow number (FN). The low-temperature cracking resistance of the mixtures was evaluated …
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Damage of concrete with epoxy coated reinforcement due to corrosion, freeze-thaw and fatigue with application to bridge decks
… with ECR and black steel due to corrosion, freeze-thaw, and fatigue loading for application to bridge decks.Concrete specimens with ECR and black steel reinforcement were artificially aged using freeze-thaw cycling and accelerated corrosion to simulate the varying ages of bridge decks. These …
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Interface durability of externally bonded GFRP to normal and high-performance concrete
… environmental weathering agents such as freezing-thawing, wetting-drying, and exposure to alkaline and acidic environments. Concerned with durability, this study is based on a fracture mechanics approach to evaluate the interface durability of GFRP bonded to Normal Concrete (NC) and …
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Characteristic Raman Bands of Amino Acids and Halophiles as Biomarkers in Planetary Exploration
… of simulated martian conditions, e.g. freeze-thaw cycling resulted in a maximum of 20 % biomarker signal loss for AA. Halophilic microbes survived UV exposure up to 3.5 sols, though with a complete biomarker signal loss. However, cell counts and hence, survival in near surface, …
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Biogeochemical investigation of centrifuged fine tailings deposits at an oil sands mine in Northern Alberta, Canada
… areas to facilitate further dewatering via freeze-thaw cycling. This research was focused on characterizing the biogeochemical conditions and processes within the CFT deposits. These deposits remain tension-saturated and, similar to tailings ponds, anaerobic redox processes including iron …
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Development of a high temporal resolution rockfall database using structure-from-motion photogrammetry and analyses of seasonal- and weather-rockfall relationships
… in the spring triggers rockfall as the slope thaws. Rockfall activity continues to be elevated over the summer as liquid precipitation remains high and rock blocks further destabilized by continued freeze-thaw cycling over the spring mobilize. Rockfall in the autumn is greatly reduced due to …
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Development and Characterization of an Autologous Whole Cell Breast Cancer Vaccine
… methods of inactivating cells, irradiation and freeze/thaw cycling, to see if either method was superior in establishing protective immunity. Next, we measured surface expression of MHC I, MHC II, Fas, ICAM-1, B7-1 and B7-2 and secretion of the immunosuppressive cytokines GM-CSF, IL-6, MCP-1, …
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Keratin Microparticles for Drug and Cell Delivery
… Particles maintained cell viability, even after freeze-thaw cycling, and provided a material substrate that supported cell attachment through the formation of focal adhesions. Finally, in vitro studies show that both KOS and BM-MSCs support varying aspects of skeletal muscle development, with …
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Freeze-Thaw Durability of Pervious Concrete
… of pervious concrete to degradation during freeze-thaw cycling under different soil clogging and water saturation conditions. The laboratory research associated with this project involved three primary measures of pervious concrete performance, including freeze-thaw durability, compressive …
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Repair of damaged end regions of prestressed concrete girders using fiber reinforced polymer composite materials
… An accelerated aging scheme consisting of freeze/thaw cycling in the presence of a deicing salt solution is implemented to determine the effect of long-term environmental exposure on the FRP/concrete interface. In the next phase, three-point bending tests are performed on small scale …
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