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Showing 1 to 20 of 214 for “"freeze-thaw"”.
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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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Freeze-thaw phenomenon as a climatological parameter
… is the phenomenon of alternate freezing and thawing. Mechanically, extraordinary pressures may be involved because of the density differential existing between the liquid and the solid phases of water. Physiologically, there is the availability or non-availability of water to sustain growth. …
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Seminal plasma and freeze-thaw injury to bovine sperm
… influence of sperm exposure to seminal plasma on freeze-thaw injury. In Experiment I, 14 ejaculates from 10 Holstein bulls were held at 32°C for either 0, 20, 40, 60, 120 or 240 min followed by dilution in egg yolk-citrate. All treatments were maintained at 32°C for 240 min post-collection, at …
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Freeze-thaw durability of high strength silica fume concrete
… with and without entrained air, were tested for freeze-thaw durability in accordance with ASTM C666, procedure A (freezing and thawing in water). In addition, another set of similar specimens were moist cured for 28 days instead of 14 days and tested in accordance with ASTM C666 , Procedure A to …
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Freeze-Thaw Resistance and Microstructural Characteristics of Concretes Containing Pozzolans
… and to assess the effects of such pozzolans on freeze-thaw durability, air void system and microstructure of hardened concrete. Cement was partially replaced by various quantities of the pozzolanic materials. The results demonstrated that the increase in workability attributed to the …
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Effect of Stress on Freeze-Thaw Durability of Concrete Bridge Decks
Made available in DSpace on 2014-12-10T17:25:46Z (GMT). No. of bitstreams: 1 6910650.pdf: 6703096 bytes, checksum: 3dcb99491935ccf2e581b3f4a29047e9 (MD5) Previous issue date: 1968
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Nutrient release from winter cover crops exposed to freeze-thaw events
… cover crop biomass after cycles of freezing and thawing. These freezing events may cause ice crystals to form in and between plant cells which can, in turn, result in cell lysis and tissue damage, consequently inducing nutrient release. Laboratory and field experiments were done to determine the …
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Material Characteristics of Hot Mix Asphalt and Binder Using Freeze-Thaw Conditioning
… 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 investigates the effect of …
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Decomposition and the Freeze-Thaw Process in Northwestern Montana: A Preliminary Study
… rates, particularly winter intervals of the freeze-thaw process and the possibility of the reemergence of insects during ideal conditions. It is hypothesized that the majority of insect activity on the carcasses will be limited to only internal activity during harsh weather conditions. Both …
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Decomposition and the Freeze-Thaw Process in Northwestern Montana: A Preliminary Study
… rates, particularly winter intervals of the freeze-thaw process and the possibility of the reemergence of insects during ideal conditions. It is hypothesized that the majority of insect activity on the carcasses will be limited to only internal activity during harsh weather conditions. Both …
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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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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 …
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Failure of fractured rock masses in periglacial environments.Experimental investigations on freeze-thaw induced damage.
L'abstract è presente nell'allegato / the abstract is in the attachment
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Evaluating CEN/TS 12390-9 To Assess Concrete for UK Freeze-Thaw Exposure Conditions
… over the performance of these concretes in freeze-thaw environments. This research project investigated the influence of cement type on concretes subjected to freeze-thaw conditions and the correlation between the microstructural properties of concrete and freeze-thaw performance using the …
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Freeze-thaw environment of precast concrete crossties and effect of vibration on fresh materials
… to multiple deterioration mechanisms including freeze-thaw damage. This early degradation in critical transportation infrastructure necessitates a better understanding of the durability of high performance concrete in wet, wintry climates. In particular, the concrete crossties have been found to …
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A comparative study of freeze-thaw processes for conditioning wastewater and water treatment sludges
… the application of indirect- and direct-contact, freeze-thaw conditioning techniques for improving the dewatering characteristics of both wastewater and water treatment sludges. Sludges tested included waste activated sludge, primary sewage sludge, waste activated/primary sewage sludge mixtures …
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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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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 …
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The kinetics and thermodynamics of human erythrocyte freeze-thaw damage at sub-optimal cooling rates.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1977.
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Admixture compatibility and freeze-thaw resistance of concrete prepared using commercially produced limestone calcined clay cements
… and durability properties (drying shrinkage and freeze-thaw resistance) were documented for LC3 concretes using standardized testing procedures. While all concrete mixtures produced satisfied the compressive and flexural strength requirements for paving concrete, concrete produced using one LC3 …
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