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Berkeley CIVENG 165 - Metro East Light Rail Maintenance & Operations Facility

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Metro East Light Rail Metro East Light Rail Maintenance & Maintenance & Operations FacilityOperations FacilityLiaison: Armando TiscarenoSenior Project ManagerStacy & Witbeck, IncProject Members:Ishmael Ayesh Terry NgAndrew Sukkar Elyse WongLocationFinished ProductUnder Construction•Site: 13 acres in size• historical fill layer underlain by bay mud (year 2000). •Building: 180,000 square feet and 40 ft high•150 feet long, 20 feet across •Reinforced Concrete•Estimated 110 cubic yardsSpecificationsFocus Points•Mix Design• Placement Method• CuringMix DesignConcrete• The project required several different concrete mixes to accommodate the demands of a wide range of applications.• Each concrete mix had its own unique requirements.• All the mixes were made of the same aggregate and cement unless otherwise stated.Project MixesApplications Class Minimum Compressive Strength @ 28 days (psi) Special Requirements Footings, walls, slabs, beams, mats etc. (except piles) A 27.6 MPa (4,000) None Track Foundations B 27.6 MPa (4,000) Compressive strength 13.7 MPa (2,000 psi) after initial 72 hours Concrete fill between tracks. C 20.7 MPa (3,000) None Pavement Concrete D 20.7 (3,000) None Lean Concrete or Backfill E 13.8 MPa (2,000) None Pea Gravel Concrete F 13.8 MPa (2,000) None Piles (Not in ContractŠNIC) G 48.3 MPa (7,000) Use Type V Cement Concrete on Metal Deck H 27.6 MPa (4,000) Proportion by ACI 211.1 with a maximum weight of 1840 kg/m3 (115 pcf)Class A Mix ProportionsOz/cwt30.0----Pozzolan 200NLbs1454.02.658.793Sechelt SandLbs1780.02.7210.4871” Sechelt AggregateLbs88.02.34.603Fly AshLbs495.03.152.518Type II ModifiedLbs262.01.004.199WaterVolume1.50.00.405AirSSD WeightsSpecific GravityVolume (CU FT)Class A Properties• Compression strength: 5359 psi @ 28-days (standard 280 psi from 19 samples).• W/C ratio: .45•Slump: 5 inches• Unit Weight of fresh concrete: 151 lbs/cu.ft.* Class A concrete satisfies class b requirements by achieving a compressive strength of 2000psi @ 72-hours.ComplicationsProblemThe specificationsstated that only Feltonor Olympia sand canbe used for the mixdesign, but both reserves have been depleted.SolutionThe R&W concrete contractors and Bode Concrete worked with Stacy & Witbeck to find an alternative supplier. Sechelt sand, from the same producer of the course aggregate for this project, was selected because of its lower water demand and dry shrinkage properties.Placement MethodTransport: Truck Agitator•Good quality control•Controlled discharge•Timing of delivery• No slump test•Casted cylindersPlacement: PumpingPlacement: PumpingAdvantages• Convey concrete from discharge point to formwork• Pipelines take up minimal space• Readily detachable•FlexibleDisadvantages• Required large crew & equipment• Continuous supply of fresh concrete• Segregation• Must have even flowPlacement: PumpingConsolidationPurpose• Remove honeycombs, entrapped air, uneven surfaces, unfilled spaces• Better situate concrete around rebarConsolidation at Our SiteFinishing of Concrete•Proper finishing required for flatwork•Sequence must be carefully coordinated1. Screeding2. Bull floating3. Power Floating4. Steel trowled5. BroomingCuringCURINGObjective:prevent the loss of moisture and to control the temperature of concreteCuring Compounds• 1200- White Series• Fibre Expansion Joint• Speed-E Joint• Ceramar1200-White Series• ideal for application on exterior, horizontal surfaces1200-White Series• Optimizes water retention• White coloring reflects sun rays and keeps concrete surface cooler→ reduces thermal cracking• Increases tensile strength→ increased resistance to cracking,surface crazing, and shrinkage1200-White Series Precautions:• preventing it from freezing• avoiding its use on surfaces that will be painted, tiled, hardened, sealed or treated.• spray on in one even coat as soon as the surface water disappeared from the horizontal concrete surfacesFibre Expansion Joint• cellular fibers securely bonded together • versatile, resilient, flexible and non-extruding→ 70% recovery after compression, → will not deform, twist or break under handlingSpeed-E Joint• Controls cracking in concrete• locks into aggregate just below surfaceCeramar• foam expansion joint filler • absorbs minimal amount of water • lightweight and flexible→ forms and wraps around curved surfaces• highly resilient with recovery qualities of 99%→ expansion and contraction movements• relieves stress and pressure in concrete


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