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 54 for “"Penetration Resistance"”.
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Chloride Penetration Resistance and link to Service Life Design of Virginia Bridge Decks
Reinforced concrete (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 …
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Liquefaction Analysis of Level and Sloping Ground Using Field Case Histories and Penetration Resistance
Lastly, the author proposed a comprehensive liquefaction analysis procedure for sandy soils to evaluate liquefaction susceptibility, liquefaction triggering, and post-triggering stability. The procedure incorporates the proposed relationships to estimate yield and liquefied strength ratio, and does …
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The Effects of Vibration on the Penetration Resistance and Pore Water Pressure in Sands
The current approach for using cone penetration test data to estimate soil behavior during seismic loading involves the comparison of the seismic stresses imparted into a soil mass during an earthquake to the penetration resistance measured during an in-situ test. The approach involves an indirect …
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Design and development of a tractor-mounted, recording penetrometer
… penetrometer, (ii) to collect the initial penetration resistance data from the experimental plots established for the long term study. A penetrometer assembly was designed and constructed with the capability of collecting penetration resistance across two crop rows. At any point, the …
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An Experimental Study on the Aging of Sands
… these aging effects are of increases in the cone penetration resistance. Time-dependent increases in penetration resistance have been measured in hydraulically placed fills and freshly densified deposits, with the largest in-creases following the use of ground modification techniques such as …
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Cryogenic penetration and relaxation behavior of dry and icy lunar regolith simulants
… pressure, density, and ice content. We measured penetration resistance and load-relaxation behavior for both dry simulants under constant displacement rate penetration at pressures ranging from 1E-5 Torr to 700 Torr and at relative densities of ~20% and ~80%. Penetration resistance was sensitive …
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Variabilidade espacial de atributos físicos em latossolo amarelo de área experimental
… soil density (Ds), moisture content and penetration resistance (RMP). We performed geostatistical analysis and descriptive. Soil bulk density and moisture were the variables with greater and lesser extent, 213 and 6.5 m, respectively, expressing their knitting sample for future studies. …
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Ultrasonic wave reflection measurements on self-compacting pastes and concretes
… by UWR. UWR results were compared with standard penetration measurements. Stiffening behavior and setting times for normal cement pastes, pastes modified with mineral and chemical admixtures, self-compacting pastes, and concretes were explored using penetration resistance, S-wave and P-wave …
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Resistance of Carbon Fibre Reinforced Composites to Quasi-static and Ballistic Perforation
… mechanisms, as well as the indentation and penetration resistance, of carbon fibre reinforced plastic (CFRP) cross-ply laminates were investigated under quasi-static and ballistic loading. In this thesis, the two most prominent failure modes were indirect tension and shear plugging. To …
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An investigation into the effects of surface composition and preparation on the mechanical properties displayed by equestrian surfaces.
… three properties; hardness, traction, and penetration resistance. This suite of measurements plus, moisture content and particle size distribution were then carried out on a variety of different arenas nationwide. Arenas were categorized by status (elite Or standard), but the same testing …
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Energy-Based Evaluation and Remediation of Liquefiable Soils
… values as a function of their corresponding SPT penetration resistance, a correlation between the normalized energy capacity of the soil (NEC) and SPT penetration resistance is established by the boundary giving a reasonable separation of the liquefaction / no liquefaction data points. NEC is the …
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Micromechanics of ultra-high molecular weight polyethylene fibre composites
… considered to be state-of-the-art materials for penetration and ballistic impact protection applications. The composites are made of strong UHMWPE fibres with a soft compliant matrix. The extreme anisotropy caused by the mismatch between the stiffness and strength of the fibres and the matrix …
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A wetland trafficability hazard index based on soil physical properties and site hydrology evaluations
… index. Volumetric moisture content and penetration resistance of the A horizon were used due to their relationships with trafficability and ease of determination. Estimates of pressure applied to the soil by harvesting equipment were used to find the limits of the sandy loam A horizon to …
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Stratigraphy of offshore sediment of Lake Agassiz, North Dakota
… a high liquid limit (63% to 104%), and very low penetration resistance (4 to 7 blows per foot). The southern part of the Brenna Formation and the Wylie and Argusville Formations have similar engineering properties. The range in water content (38% to 69%), liquid limit (39% to 93%), and …
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Multiscale materials design of natural exoskeletons : fish armor
… senegalus scales were understood with respect to penetration resistance by the multiscale experimental and computational study. The quad-layered scales exhibit mechanical gradient within and between material layers and have geometrically corrugated junctions with an undetectable gradation; all of …
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Modeling The Fluid To Solid Transition In Cement Paste, Mortar, And Concrete
… outcomes that include stiffening as measured by penetration resistance and compressive strength. The primary focus is on correlating or predicting the outcomes rather than on the internal growth mechanism itself, which in this case is the hydration of Portland cement. Also, the proposed framework …
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Reverse engineering nature : design principles for flexible protection inspired by ancient fish armor of Polypteridae
… etc.) of the individual bony scales to provide penetration resistance. Here, geometric design is explored at increasingly larger length scales including 1) morphometric features within individual scales, 2) morphometry of the individual scales as a whole, 3) scale-to-scale interconnections and …
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Micromechanical Aspects of Aging in Granular Soils
… include the small strain modulus and stiffness, penetration resistance, liquefaction resistance, and pile setup. Different hypotheses have been proposed to explain the occurrence of aging in granular soils, including cementation induced by dissolution of silica and precipitation at the particle …
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Quality Soil Management in Illinois Using Winter Cover Crops
… aggregate stability (WAS), bulk density (BD), penetration resistance (PR), total porosity (TP), pore size distribution, water retention properties, and saturated hydraulic conductivity (K sat). Compared to winter fallow, crop sequences that included WCC provided substantial benefits from the …
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