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.
Results
Showing 1 to 20 of 75 for “"freeze-thaw cycles"”.
-
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 …
-
Multiscale modeling of transport mechanisms and quality changes in frozen foods during freeze-thaw cycles
… and mechanical changes in foods subjected to freeze-thaw cycles. From the experimental aspect, the 3D microstructure of frozen potatoes was investigated by using an innovative high-resolution internal imaging method: X-ray micro-computed tomography (CT), to study the effect of temperature …
-
Development and performance of self-healing and self-immune soil-cement systems subjected to freeze-thaw cycles
… soil-cement systems are vulnerable to cyclic freeze-thaw deterioration. The engineering properties of soil-cement systems, such as strength and permeability, can be substantially degraded under the action of freeze-thaw cycles. This durability problem substantially impairs the sustainability …
-
Dynamics of residual non-aqueous phase liquids in porous media subject to freeze-thaw
This project concerns the effect of freeze-thaw cycles on the pore-scale structure of nonaqueous phase liquid (NAPL) contaminants in water-saturated porous media. This problem is of critical importance to the entrapment of such contaminants in cold temperate, polar and high altitude regions, and …
-
The Effects of Freezing on the Mechanical Properties of Articular Cartilage
… have investigated and dismissed the effect of freeze-thaw cycles on both skeletal muscle and on trabecular bone, but have failed to properly address the effects of these storage methods on the integrity of articular cartilage. Preventing cartilage injury is important in minimizing the long term …
-
Fate of Salmonella and Listeria monocytogenes in different frozen produce commodities
… may expose produce to repeated freezing and thawing, at different temperatures and times. This study aims to (i) model the survival of Salmonella and Listeria monocytogenes in frozen banana, cantaloupe, and sweet corn for up to 90 and 180 days, respectively, and (ii) to evaluate the single …
-
Long-Term Performance of Seismically Rehabilitated Corrosion -Damaged Columns
… smaller scale specimens, were subjected to 47 freeze-thaw cycles. Damage at the concrete-carbon composite interface due to freeze-thaw was assessed using non-destructive methods and structural testing. The efficiency of using ACM to upgrade corrosion-damaged columns was investigated through …
-
The investigation of methods to assist decision-makers regarding bridge maintenance, rehabilitation, and restoration activities
… deterioration by environment factors including freeze-thaw cycles, de-icing salts, and vehicular traffic, are also examined through analysis and comparison of deterioration of selected bridges from two contrasting regions in the Province of Ontario.
-
Influencia de las condiciones de curado en el comportamiento del hormigón sometido a ciclos hielo-deshielo
… pérdida de peso y cambios de longitud. ABSTRACT Freeze–thaw process is one of the main causes of concrete degradation in cold regions. In central and eastern Europe, the climatic conditions in the winter season are particularly severe for concrete construction. The successive freezing/thawing …
-
Performance Characterization of Recycled Asphalt Pavements with Warm Mix Asphalt Technologies
… the indirect tensile strength test for 0 and 1 freeze-thaw cycles. Resistance to rutting was evaluated by determining flow number using the Asphalt Mixture Performance Tester (AMPT) machine. Finally, thermal resistance of the mixtures were evaluated by conducting Uniaxial Thermal Stress and …
-
Composite hydrogel-nanofibre vessels for vascular graft applications
… gelatin or starch and by treatment with freeze-thaw cycles and coagulation. The synergistic crosslinking with the freeze-thaw technique and coagulation was found as a versatile method to control the structure and mechanical properties of PVA-based hydrogels. A further study was focused on …
-
Material Characteristics of Hot Mix Asphalt and Binder Using Freeze-Thaw Conditioning
… in a single year, the pavement undergoes many cycles of freezing and thawing. Freeze-thaw, as well as traffic loading, are important parameters in the study of damage in asphalt pavement. In areas of wide ranging temperatures, pavements are susceptible due to thermal cracking. This study …
-
EXTENSIVE GREEN ROOF SUBSTRATE COMPOSITION: EFFECTS OF PHYSICAL PROPERTIES ON MATRIC POTENTIAL, HYDRAULIC CONDUCTIVITY, PLANT GROWTH, AND STORMWATER RETENTION IN THE MID-ATLANTIC.
… were tested for durability against successive freeze/thaw cycles with before and after-treatment granulometric distribution analyses. All substrate blends showed significant (p<0.05) particle degradation after 30 freeze-thaw cycles, compared to German (FLL) guidelines. The hydraulic …
-
Preservation of sperm harvested from the rat, caprine, equine, and bovine epididymis
… to establish if sperm subjected to a series of freeze-thaw cycles can maintain motility. Epididymal sperm collected from rat, caprine, equine and bovine males all maintained some level of acrosomal membrane integrity up to 96 hours postmortem. The bovine, caprine and equine sperm survived …
-
Analysis of air-void system in hardened concrete from a three-dimensional perspective
… volume of paste protected by air voids during freeze-thaw cycles. A model developed in this study provides a statistical basis for inferring the true three-dimensional volume of protected paste from two-dimensional images. Based on statistics gathered from the two-dimensional scanned image, a …
-
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 …
-
Deterioro del hormigón sometido a ensayos acelerados de hielo-deshielo en presencia de cloruros
… 1. ABSTRACT Concrete deterioration due to freeze-thaw cycles in the presence of de-icing salts is a frequent cause of problems in concrete bridges and other civil infrastructures in Europe. Concrete damage generated by freeze-thaw cycles can be internal, mainly by cracking and/or external, …
-
Comprehensive Evaluation of Asphalt Mixtures in Arid Climatic conditions
… (UC) and moisture-conditioned states at one freeze-thaw cycle (1-C) and three freeze-thaw cycles (3-C). The TSR, HWTT, and E* were performed for both the asphalt mix designs. However, the CF and SSR tests were only performed for the Superpave mix design based on the findings from TSR, HWTT …
-
Multifunctional Liposomal Carriers Encapsulating Temozolomide, RG7388 and Elacridar for Targeted Glioblastoma Multiforme Therapy
… 200 nm with a negative charge. The effect of freeze thaw cycles on liposome bilayer characteristics was tested and it was found that increasing freeze thaw cycles to unilamellar vesicles caused an increase in the liposomal bilayer. The encapsulation efficiency for the surface modified …
Page 1 of 4