Applications of UHPC Pakistan Academy of Engineering December 28, - - PowerPoint PPT Presentation

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Applications of UHPC Pakistan Academy of Engineering December 28, - - PowerPoint PPT Presentation

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Applications of UHPC Pakistan Academy of Engineering December 28, 2019 Tariq M. Bashir, PE UHPC Ultra-high Performance Concrete (UHPC) Steel fibers to enhance cracking resistance and ductility High compressive and tensile strengths

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Applications of UHPC

Pakistan Academy of Engineering

December 28, 2019 Tariq M. Bashir, PE

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Ultra-high Performance Concrete (UHPC) ACI 249 defined UHPC as: “Concrete, ultra-high performance – concrete that has a minimum specified compressive strength of 150 MPa (22,000 psi) with specified durability, tensile ductility and toughness requirements; fibers are generally included to achieve specified requirements.” ▪ Steel fibers to enhance cracking resistance and ductility ▪ High compressive and tensile strengths ▪ Exceptional durability ▪ Self-consolidating ▪ Absence of coarse aggregate (mortar) ▪ High binder content ▪ Low w/cm ▪ High particle packing density

UHPC

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Sand Binder (cement, fly ash, slag, silica fume) Admixtures Water Steel fibers

  • Strategies

➢ Use high-volume by-products (e.g. fly ash & slag) to partially replace cement ➢ Use cost-effective sand to replace fine ground silica sand ➢ Reduce steel fiber content ➢ Reduce binders (silica fume) content

Design of cost-effective UHPC

Components of UHPC

Meng W, Valipour M, and Khayat KH. Optimization and Performance of Cost-Effective Ultra-High Performance Concrete, Materials and Structures 2016, 50(1), 29.

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CC FRC UHPC Tensile stress Tensile strain

➢ High mechanical strengths

✓ Compressive strength (28 days): ≥ 120 MPa ✓ Tensile strength (28 days): ≥ 7 MPa

➢ Strain-hardening behavior

UHPC: ultra-high performance concrete HPC: high-performance concrete CC HPC UHPC Compressive stress Compressive strain

Advantages of UHPC

  • Resilience

FRC: fiber-reinforced concrete CC: conventional concrete

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Useful Properties

  • 1. Strength
  • 2. Strong Bonding
  • 3. Moldability
  • 4. Impermeability
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Development Length Tests

#4 BARS (BLACK & EPOXY) – 3” EMBEDMENT #5 BARS (BLACK & EPOXY) – 4” EMBEDMENT #6 BARS (BLACK & EPOXY) – 5” EMBEDMENT

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➢ Low construction energy (no mechanical vibration for consolidation) ➢ High construction quality

Advantages of UHPC

  • Super workability (self-consolidating)

280 mm

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Sherbrooke foot bridge, Canada, 1998 Bridge overlay, Switzerland, 2015 Precast bridge deck, Iowa, 2012

Applications of UHPC in civil infrastructure

Bridge girder connection, New York, 2010

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Canada France

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Kora Japan

Longer spans, shallower depths, lighter weight

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  • Simple Lap-Splice Cxn.
  • Smaller Grout Volumes
  • Shortened Bar Lengths
  • Emulates Monolithic

Component

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Precast Deck Panels and Slabs

61 in. 6 in. Closure Pour (UHPC) Deck Bulb Tee Prestressed Girder 41 in.

6 in. UHPC Closure Pour Precast Deck Panel 8 in. 96 in.

Deck Bulb Tee Girders

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Joint Testing by FHWA for Strength Durability and Performance

  • 8” THICK PANEL - #4 EPOXY COATED

HAIRPIN BARS 8” THICK PANEL - #5 GALV. STRAIGHT BARS (6” LAP) 8” THICK PANEL - #5 BLACK STRAIGHT BARS (6” LAP) 8” THICK PANEL - #5 BLACK HEADED BAR (3 ½” LAP) 6” THICK PANEL - #5 BLACK STRAIGHT BARS (6” LAP) 6” THICK PANEL - #5 BLACK HEADED BARS (3 ½” LAP)

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Test Conclusions

  • 1. Joint system emulates or surpasses C I P

monolithic decks hence can be designed similar to CIP decks

  • 2. No interface de-bonding during testing was
  • bserved
  • 3. No de-bonding of reinforcing bars during

testing

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Link Slab Section

Girder Haunch Deck Link Slab

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Why use Link Slabs?

  • Elimination of deck joints

▪ Leakage - accelerated deterioration of girder ends, bearings, substructures ▪ Frequent maintenance ▪ User comfort

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Why use Link Slabs?

  • Simple span behavior retained

▪ Girders function as originally designed

  • Economical means to eliminate joints
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How do they work?

  • Ends of deck are connected or linked

together

  • Pinned connection in slab
  • Girder’s point of rotation moved from

bearing to link slab

  • Translation due to girder’s rotation

moved from joint to bearing

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Deck Joint

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Link Slab

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UHPC Link Slab

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Finished Link Slab

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Precast Pier Elements

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Bridge Deck Overlay

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Repair and protection of foundations and supports (AFGC, France) Enhanced durability and accelerated construction

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Architectural Applications

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Rotman School of Management (expansion)

Toronto, Canada Designer: KPMB Architects Built: 2012 Dimensions: panels 0.5 m to 1.0 m wide x 3.5 m to 5.3 m high x 2.5cm thick Fabricator: Armtech

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Rotman School of Management (expansion)

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Dumbo Lofts 28 UHPC panels Each panel is 18 ft x 11 ft

Ribs 10 in Back pan ¾ in thick

Ribs taper from 4 in to 1 ¼ in thick Fabricator: Gate Precast

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Tower La Marseillaise

Marseille, France 135 M Tall Flat Panels, Shade Louvers, Lattices

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Tower La Marseillaise

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Nike Flagship Store

Miami, Fl Designer: Nike Built: 2016 Dimensions: panels 4’ x 4’ Fabricator: DEX Industries

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Nike Flagship Store

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TGV Station Montpellier

Montpellier, France Designer: Marc Mimram Built: 2017 Dimensions: roof 18m x 2m x 5cm Fabricator: Mêditerranêe Prêfabrication

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TGV Station Montpellier

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Marseille, France Designer: Rudy Riciotti Built: 2012 / 2013 Lattice Panel Dimensions: 6m (19.6 ft) x 3m (9.8 ft) 7cm (2.7 in) thickness roof panels and 10 cm (3.9 in) thickness wall panels Fabricator: Bonna Sabla

MUCEM

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Columns: 3 stories, Post Tensioned Pedestrian Bridge: 360 foot free span. Post tensioned world record for slenderness

MUCEM

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Drop Stair

London, England Designer: Zaha Hadid Built: 2012 Fabricator: Il Cantiere

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Questions