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 37 for “"Wetting and drying"”.
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The effect of cyclic wetting and drying on the corrosion rate of steel in reinforced concrete
… corrosion is the reduction of oxygen, and as a result the availability of oxygen is a key factor when considering reinforcement corrosion in the marine tidal zone. The corrosion rate may be effectively reduced if the drying time of the concrete during tidal cycles is sufficiently short, …
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Hydraulic properties of asphalt concrete
This research has applied standard unsaturated flow models and laboratory methods common to soil analysis, to characterize the hydraulic properties of asphalt concrete. Wetting and drying water characteristic curves were measured for six asphalt concrete cores. From the water characteristic curves, …
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EFFECTS OF DEICING SALTS ON THE DURABILITY OF CONCRETE INCORPORATING SUPPLEMENTARY CEMENTITIOUS MATERIALS
… (MgCl2) is evaluated based on damage due to wetting and drying and scaling, with the goal of determining appropriate replacement levels of portland cement using these SCMs. The mixtures had water-to-cementitious material ratios of 0.38 and 0.44 and SCM percentage replacements of portland …
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Impact of added insulation on the hygrothermal performance of leaky exterior wall assemblies
… insulation to leak exterior wall assemblies and to monitor air leakage paths within them. The procedure involves the construction of a full-scale test hut exposed consecutively to climatic conditions representing winter and late spring, inside the environmental chamber. Two re-insulation …
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Behaviour of epoxy filled flat-face joints in concrete for wave energy converters
The need and demand for renewable energy is widely understood but there has been equally vociferous opposition to the capital and operational costs of these technologies. While wind energy has developed extensively in the offshore environment over the past decade, problems with intermittent …
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Effects of reinforcement corrosion on the structural performance of reinforced concrete beams
… are investigated, the first without any stirrups and the second with stirrups. The specimens were corroded galvanostatically as well as by subjecting them to alternate cycles of wetting and drying with a saline water. An attempt is made at classifying the extent of corrosion of the reinforcing …
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Shear strength behaviour of sugarcane bagasse reinforced soils
… abundant plant based crop grown in the tropics and part of the temperate climates. Its by-product, sugarcane bagasse, constitutes 30% of the total production. In the past, it was considered as waste material but contemporaries through innovative research projects over the years have found uses …
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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
… owing to the high levels of chlorides available, and so structures located here are particularly vulnerable to chloride attack and chloride induced corrosion of steel. In order to intervene and address the concern of premature deterioration in the marine environment, design guidelines and …
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Rapid assessment of the potential chloride resistance of structural concrete
… the basis of equal compressive strength, i.e. 40 and 50 N/mm2 and an equal water-cement ratio of 0.45. In addition to the CEN TS 12390-11:2010, rapid test methods NT Build 492 and a steady-state migration test UNE 83987:2009 were also conducted. Selected concretes were also tested for cyclic …
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PALEOCLIMATE DURING DEPOSITION OF THE GREATER TWILIGHT PARK CONGLOMERATE, UPPER DEVONIAN, SOUTHEAST NEW YORK
The Acadian Foreland Basin formed from the collision of various exotic terranes with the continent of Laurentia, primarily during the Devonian Period. This created the southward propagating Acadian Orogeny. Formation of the basin and the cratonward-prograding Catskill clastic wedge promoted …
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Spatial Analysis of Soil Creep Rates on Mount Sequoyah, Fayetteville Arkansas
… general downslope movement of sediments, soils, and rock through different processes that cause instabilities along a hillslope, and in its soil and loose rubble mantle. For this study, we looked at soil creep, which is the small-scale movement of soil downhill because of gravity, wetting and …
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Evapotranspiration in Mid-South Rice Production
… systems under the reality of climate change and an increasing global population, rice production systems require solutions to a number of issues, including a limited water supply. As producers explore new strategies for conserving local water resources to continue to maintain yields, new …
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Interface durability of externally bonded GFRP to normal and high-performance concrete
… are being increasingly used for seismic retrofit and rehabilitation of concrete structures. Glass fibers exhibit high strength to weight ratio and low cost in comparison to carbon and aramid fibers. However, previous studies have shown that glass fibers are vulnerable to attack caused by harsh …
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Use Patterns and Influencing Factors of Irrigation Best Management Practices in the Lower Mississippi River Basin
… 2016 Irrigation Survey from Arkansas, Louisiana, and Mississippi to document the use of irrigation best management practices (IBMPs), analyze use patterns, and use quantitative methods to determine factors that influence producers’ decisions regarding IBMPs. IBMPs included in the survey can be …
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Non-equilibrium thermodynamics in porous media : battery degradation, and sorption and transport in porous materials
… media offer many interesting problems in physics and engineering due to the interaction of phase transitions, surface effects and transport. In this thesis I examine two such problems: the degradation of lithium-ion batteries, and sorption and transport of fluids in porous materials. The dominant …
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The effects of chloride-based deicing chemicals on degradation of portland cement mortars with alkali reactive aggregate
… of long-term exposure to deicers, freezing and thawing cycles, and wetting and drying cycles. In order to develop a more comprehensive view of these topics, the present study was conducted in three phases. The focus of the first phase was on studying the effects of the chloride-based deicers …
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Soil drying and re-wetting effects on phosphorus availability and plant yields
Water and phosphorus (P) are essential resources for crop production, yet both are increasingly limited, threatening global food security. Soil drying and re-wetting (DRW) has reportedly increased P availability in numerous soils, whilst intermittent irrigation that applies less water than …
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Characterizing and modeling wet stream length dynamics in Appalachian headwaters
… change in wet length in response to storm events and seasonal moisture conditions. These low-order channels with temporary flow are pervasive across arid and humid environments yet receive little attention in comparison to perennial waterways. This dissertation examines headwater stream length …
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Methodological Developments for an Improved Evaluation of Climate Change Impact on Flow Hydrodynamics in Estuaries
… methods, namely, Nearest Neighbouring and Quantile-Quantile techniques, are developed and implemented in order to predict the wind speed over the study area. Wind speed has an essential role in flow field and wave climatology in estuaries and gulfs. In order to make the proposed …
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An Implicit Finite-Volume Depth-Integrated Model For Coastal Hydrodynamics And Multiple-Sized Sediment Transport
… for simulating wave-averaged hydrodynamics and nonuniform sediment transport and morphology change in coastal waters. The hydrodynamic model includes advection, wave-enhanced turbulent mixing and bottom friction; wave-induced volume flux; wind, atmospheric pressure, wave, river, and tidal …
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