• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
CON 123 Session 7 - Slag Cement
 

CON 123 Session 7 - Slag Cement

on

  • 1,060 views

 

Statistics

Views

Total Views
1,060
Views on SlideShare
1,052
Embed Views
8

Actions

Likes
2
Downloads
0
Comments
5

1 Embed 8

http://bb.alpenacc.edu 8

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel

15 of 5 previous next Post a comment

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    CON 123 Session 7 - Slag Cement CON 123 Session 7 - Slag Cement Presentation Transcript

    • CON 123Cementitious MaterialsSession 7Slag Cement
    • Ground Granulated Blast-Furnace Slag “Cement” (GGBFS) Ground Granulated blast-furnace slag is the correct technical term for slag that is finely ground and is used as a separately batched cementitious materials. Slag is ground to the fineness of Portland cement or finer.
    • Ground Granulated Blast-Furnace Slag “Cement”Finely Ground granulatedblast-furnace slagconsisting of primarilycalcium and aluminumsilicates, used as a partialreplacement for Portlandcement in concrete
    • ASTM 989 Slag Cement GGBFS – glassy granular material formed when molten blast-furnace slag is rapidly chilled as by immersion in water with or without compositional adjustments made while the blast-furnace is molten
    • Grades of Slag - ASTM C 989 Strength of 1:1 Slag: Cement MortarSlag Activity Index = Strength of Control Cement Mortar Grade 7-day Index 28-day Index 80 - 75 100 75 95 120 95 115 Requirements for average of 5 consecutive
    • Specifications and Grade of Ground Granulated Iron Blast-Furnace Slags ASTM C 989 (AASHTO M 302) Grade 80  Slag with a low activity index Grade 100  Slag with a moderate activity index Grade 120  Slag with a high activity index
    • Slag - Manufacture Iron Blast Furnace Iron ore is layered with a mixture of limestone and coal or coke. The coal is the fuel. The limestone is a flux that reduces fusion temperatures. The molten materials settle out at the bottom and slag floats on the top of the pig iron. It is tapped away
    • Slag - Manufacture Iron Blast FurnaceIron Ore Limestone/CoalFusion at1400 to 1600 C Slag Pig Iron
    • Slag – Manufacture Hot Runner Molten blast furnace slag is tapped from the blast furnace, moved through a hot runner on the blast-furnace work floor. Dropped in a “blow” box to a jet-process granulator. GGBF is glassy - with the right chemistry and morphology to form hydraulic cement when finely ground.
    • Slag – Manufacture Hot Runner
    • Slag - Manufacture Jet Process Granulator Liquid Slag Adjustable Deflector Plate Furnace RunnerVibrating Feed Plate Rotating Drum Granules Pellets
    • Slag Products - Manufacture Molten Slag is cooledAir-cooled AggregatePalletized Granules & PelletsJet Process Granulator Granules Granules are ground in a ball mill Fineness similar to cement
    • Slag - Manufacture Grinding Mills
    • SEM Micrograph of Slag Particles Scanning electron microscope micrograph of slag particles. Scanning electron microscope micrograph of slag particles.
    • Slag - Characteristics Cooled Rapidly - Glass Fineness - 450 to 650 m2/kg Specific gravity - 2.90 White to Buff color Hydration - activated by alkalis Forms cementitious silicates - C-S-H
    • Slag - Reactivity Glass content Fineness Alkalis of reacting system Concrete curing temperature
    • Slag - MechanismPortland Cement Portland Cement + GGBF Slag Reduced Permeability Increased Strength
    • Slag - Typical DosageApplication Dosage ( % by wt)Exterior flatwork 35%General use 35 to 50%Mass Concrete 60 to 80%Sulfate Resistance Type II equivalent 35% Type V equivalent 50%Marine/chemical/heat >50% < 80%
    • Slag – Typical Dosage Application Dosage (% by wt)Exterior Flatwork 35%General Use 35 to 50%Mass Concrete 60 to 80%Sulfate Resistance Type II Equivalent 35% Type V Equivalent 50%Marine/chemical/heat >50%, <80%
    • Slag - Mixture Proportioning Typical - 35 to 50% wt. cementitious w/c ratio w/(cement + slag) ratio Water demand - 1 to 5% lower Admixture dosage  Similar for air entraining admixtures  May be lower for others SG 2.90 - more abs. vol. than cement
    • Slag BenefitsWorkability Finishability Pumpability Color Durability Strength
    • GGBF Slag Concrete Workability 22
    • GGBF Slag Concrete Finishability
    • GGBF Slag Concrete Pumpability
    • GGBF Slag Concrete Color 25
    • Slag - Applications Compressive and Flexural strength Permeability Sulfate Resistance Alkali Silica Reactivity Mass concrete - more than 70% slag
    • GGBF Slag Concrete Compressive Strength 6000 Grade 120 SlagCompressive Strength, psi 5000 W/C+M ratio = 0.55 4000 3000 Portland Cement 2000 40% Slag 1000 50% Slag 65% Slag 0 0 5 10 15 20 25 30 Age, days Ref: ACI 233R
    • GGBF Slag Concrete Flexural Strength 900 800 Grade 120 Slag W/C+M ratio = 0.55Flexural Strength, psi 700 600 500 400 Portland Cement 300 40% Slag 200 50% Slag 100 65% Slag 0 0 5 10 15 20 25 30 Age, days
    • GGBF Slag Concrete Sulfate Resistance 0.25 Portland Cement (Type II)Expansion mortar bars, % 0.20 40% Slag 50% Slag 0.15 65% Slag 0.10 0.05 0.00 0 10 20 30 40 50 60 70 Age, Weeks Ref: ACI 233R
    • GGBF Slag Concrete Alkali-Aggregate Reactions 0.40Expansion mortar bars, % 0.30 Portland Cement 40% Slag 0.20 50% Slag 65% Slag 0.10 0.00 0 5 10 15 20 Age, Months Ref: ACI 233R
    • GGBF Slag Concrete Heat in Mass Concrete 80 70Concrete Temperature, C 60 50 40 30 20 Portland Cement 10 70% Slag 0 1 10 100 1000 Age, Hours Ref: ACI 233R
    • GGBF Slag Concrete Chloride Permeability 7500 Water-Cement RatioCharge Passed, Coulombs 6000 0.70 4500 0.55 0.45 3000 1500 0 Portland cement 25% Slag 50% Slag
    • Slag Cement and the Environment Recovered/ recycled material Replaces Portland cement  Reduction of CO2  Reduction of Heat Reduced Material extraction Energy Saving Lighter Color
    • LEED Credits Leadership in Energy and Environmental Design (LEED) is a system developed by the United States Green Building Council to rate a buildings environmental performance. This system has become the principal method by which buildings can achieve green building certification. The system is based on credits earned in five major categories. Slag cement can positively impact several credit categories
    • LEED Categories􀁺 Site credit for reduction of heat islands: Use of high-albedomaterials like concreteproduced with slag cement. 􀁺 Materials credit for building reuse: Slag cement makesconcrete structures moredurable. 􀁺 Materials credit for recycled content: Slag cement is arecycled material used inconcrete. 􀁺 Materials credit for use of local/regional materials: Slagcement can be considereda local material in many areas.For more information on the LEED system, visit www.usgbc.org
    • LEED Categories Site credit for reduction of heat islands: Use of high-albedo materials like concrete produced with slag cement. Materials credit for building reuse: Slag cement makes concrete structures more durable. Materials credit for recycled content: Slag cement is a recycled material used in concrete. Materials credit for use of local/regional materials: Slag cement can be considered a local material in many areas. For more information on the LEED system, visit www.usgbc.org.