BLANCA MENDOZA • ELVIS IBARRA ERIKA NEVAREZ • DANIEL CASTANEDAI-880/Mission BoulevardUC BerkeleyOld configurationOld configurationNew ConfigurationNew ConfigurationI-880 Expansion History(Google Maps)(Google Maps)I-880 Expansion HistoryOfficially calls for connecting HOV lanes$178 million dollar projectExtends from CA-237 to Fremont Blvd.Multiple Authorities: Alameda County Transportation City of Fremont US Department of Transportation Federal Highway AdministrationBridge Under Construction● ObservationsFebruary 2nd, 2007● 63 million dollar bridge. ● 1000 trucks of concrete. ● Steel: 1M tons● False-work: Seismic safety is not a design component for its erection.View of top portion of bridge● Processing-Concrete placement in action. Equipment: PumpBid-Well Concrete PaverLabor: 15 workers● Observations-Traffic fully operational below. -RebarStructures● Post Tensioning-Curvature- Helps place concrete into compression. - Duct in greenProfile of OverpassStructures-Simplify as beam -Statically oIndeterminate-Post Tensioning-Moment diagram is shown in red. -Tension is shown in blue. -Duct in green.Simplification of OverpassStructures-Post Tensioning- Concrete poured around ducts- Steel Placement -Jacking of steel- CementitiousmaterialMaterials - Cementy Type II- modified Portland Cement{ LA ~ Low alkaliy Moderate heat of hydration{ light mass constructiony Moderate sulfate-attack resistant{ some sulfur in environmentMaterials - Aggregatesy #57 Aggregate { combination of #5 and #7y Natural Sandy Both comply with ASTM C33{ Standard Specification for Concrete AggregateMaterials - Admixturesy 15% by weight of Class F Fly Ash{ Industry practices and compressive strengths requirements{ Improves the workabilityÙ PumpabilityBatching and Mixingy Sources: Lonestary Quality Control Test { Daily material inspection{ Kelley Ball Test800 cubic yards (cy) of concrete poured500 cy poured previous Tuesday ~ 70 meters in length18 inches deepFebruary 2, 200780 cubic yards per hour5-6 inch diameter hose#57 aggregatePumped up to over 80 ft. PouringAir-powered vibrators2 inch diameterConsolidationConsolidationScreedingHand shovel for screedingPneumatic air-powered vibratorManual bull-floating Edge WorkBidwell MachineMechanically finishes the concrete surface. FinishingDual front augersRotavibe®Bull-floatScreeding and BullfloatingTrowel and FinishingMetal-alloy panelsAstroturf carpet Followed by curing“20% technical work, 80% people skills”• 833 CAD Sheets for entire project• Est. Completion Date: 2009Overall Interchange Improvement ProjectAny
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