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Showing 1 to 7 of 7 for “"Spruce Pine"”.
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Petrogenesis of the Spruce Pine pegmatites, North Carolina
Pegmatites in the Spruce Pine district, North Carolina, are an example of muscovite class pegmatites that were derived from differentiation of a magma. There are eight granodiorite plutons in the Spruce Pine area ranging in size from 1 to 20 square kilometers that contain and are surrounded by …
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Economic Potential of Rare Earth Elements Within Accessory Minerals of Granitic Pegmatite Mine Tailings
… multiple industries. This study investigates the Spruce Pine district of North Carolina, testing the economic feasibility of repurposing current mine waste tailings as a rare earth element resource. Spruce Pine is home to several active quartz and feldspar mining operations, with large waste …
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Effect of Cracking on Lag Bolt Performance
… diameter. Two species of wood, Douglas-fir and spruce-pine-fir, three lag screws diameters, and three pilot hole diameters for each species of wood were implemented. Models were developed to predict lag screw connection capacity and 5% offset yield and are contained herein. Models were based on …
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Wood Use Trends in the Pallet and Container Industry
… 610 million board feet as parts. Southern Pine (48% of the total softwood volume) and Spruce-Pine-Fir (25%) were the solid softwoods most commonly used by the pallet and container industry. Of the estimated 289 million square feet of wood panels that went into the production of pallets and …
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Investigating the Performance of Wood Portal Frames as Alternative Bracing Systems in Light-Frame Wood Buildings
… and rotational stiffness by replacing the Spruce-Pine Fir (SPF), header with the Laminated Veneer Lumber (LVL) header. The addition of the FRP to the standard wall configuration also resulted in a significant increase in the moment capacity. However, no significant effect was observed on …
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Permanent Bracing Design for MPC Wood Roof Truss Webs and Chords
… lumber was assumed to be 2x4 No. 2 Southern Pine (S. Pine) braced by 2x4 STUD Spruce-Pine-Fir (SPF). Chord load levels of 10% to 50% of the allowable compression load parallel-to-grain assuming le/d of 16 were studied. All wood-to-wood brace connections were assumed to be made with 2-16d …
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Cross-Laminated Timber made of Unmodified and Thermally Modified Yellow-Poplar Lumber
… a maximum absolute error (MAE) of 1.4–13.1% for spruce-pine-fir (SPF) CLT and 11.2% for hybrid CLT compared to 46.7–66.0% under Fick's law, with an overall R² of 0.96. Using a logistic regression moisture content-permeability submodel, the framework was extended to other wood species, generating …