Geomaterial Characterization Sub-topics Need for Geomaterial - - PowerPoint PPT Presentation

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Geomaterial Characterization Sub-topics Need for Geomaterial - - PowerPoint PPT Presentation

Nov 12, 2023 333 likes •491 views

Geomaterial Characterization Sub-topics Need for Geomaterial characterization Geotechnical Mineralogy Morphology Physical Chemical Pore-solution sampling Corrosion potential Sorption-Desorption Thermal Electrical

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SLIDE 1

Geomaterial Characterization Sub-topics

  • Need for Geomaterial characterization
  • Geotechnical
  • Mineralogy
  • Morphology
  • Physical
  • Chemical

Pore-solution sampling Corrosion potential Sorption-Desorption

  • Thermal
  • Electrical
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SLIDE 2

PHYSICAL CHARACTERIZATION Image Analysis System

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SLIDE 3

1 E -3 0 .0 1 0 .1 1 1 0 2 0 4 0 6 0 8 0 1 0 0

O L A

1 E -3 0 .0 1 0 .1 1 1 0 2 0 4 0 6 0 8 0 1 0 0

A L A 6

% finer P a r t i c l e s i z e ( m m )

Gradational analysis Ultra-sieves

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SLIDE 4

3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 200 400 600 800 1000 1200 1400

FA 1 FA 2

Particle size ( m)

200 400 600 800 1000 1200 1400 1600

FA 3 BFS

Number of particles

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

SF

Soft Imaging (Laser Particle Scanning)

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SLIDE 5

Property FA 1 FA 2 FA 3 GGBFS SF G 2.03 2.3 2.38 2.84 2.1 Specific surface area (cm2/g) 2988 3602 5048 4073 200000 Sand size (>4.75 mm) % ** Silt size (0.002-0.075 mm) % 100 95 90 97 ** Clay size (<0.002 mm) % 5 10 3 ** ** Not applicable

Particle size Range (m) Number of particles Percentage of particles FA-1 FA-2 FA-3 GGBFS SF FA-1 FA-2 FA-3 GGBFS SF 0.0-3.0 944 1295 1410 789 4451 47.6 53.0 53.1 40.3 90.6 3.0-6.0 709 989 1061 816 343 35.8 40.5 39.9 41.7 7.0 6.0-9.0 228 116 148 247 48 11.5 4.8 5.6 12.6 1.0 9.0-12.0 57 17 21 59 33 2.9 0.7 0.8 3.0 0.7 12.0-15.0 24 11 4 16 17 1.2 0.5 0.2 0.8 0.3 15.0-18.0 6 2 2 9 6 0.3 0.1 0.1 0.5 0.1 18.0-21.0 4 1 1 5 2 0.2 0.3 0.0 21.0-24.0 2 5 3 0.1 0.3 0.1 24.0-27.0 1 1 2 3 0.1 0.1 0.1 27.0-30.0 2 1 1 5 2 0.1 0.3 0.0 30.0-33.0 2 6 3 3 4 0.1 0.2 0.1 0.2 0.1 33.0-36.0 2 1 2 3 2 0.1 0.1 0.2 36.0-39.0 1 0.1

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SLIDE 6

SEM micrographs of Silica Fumes & Ground Granulated Blast Furnace Slag (GGBFS/BFS)

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SLIDE 7

SEM Photographs of Activated ash samples

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SLIDE 8

Specific Surface Area Determination

BET nitrogen adsorption Absorption of Ethylene Glycol Monoethyle Ether (EGME) method Methylene blue (MB) dye method Mercury Intrusion Porosimetry (MIP) He gas pycnometer Blaine’s apparatus

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SLIDE 9

SEM Micrographs (Original ash samples)

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SLIDE 10

MIP He gas pycnometer

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SLIDE 11

Blaine’s Air Permeability Apparatus (ASTM C 204) Portland cement as a standard reference material Specific-surface area (SB)

Ss is the SSA of cement (= 0.346 m2/g) e is the void ratio of the sample es is the void ratio of cement (= 0.5) Ts is the time of manometer drop for cement (= 77.18 s) T is the time of manometer drop for the sample

e) (1 T e T e ) e (1 S S

s 3 s 3 s S B

  

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SLIDE 12

Thermo Gravimetric Analysis

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SLIDE 13

T e m p . d i f f e r e n c e ( T ) E n d o . E x o . D T A T G A

O L A A L A 6

W e i g h t l o s s ( % ) T e m p e r a t u r e (

0 C )

TGA and DTA curve for OLA and ALA6 samples (Inert atmosphere) (Dry air atmosphere)

600 200 400 800

DTA TGA

  • Temp. difference ( T)

Endo. Exo. OLA ALA6

Weight loss (%)

20 40 60 80 20 40 60 80 100 100

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SLIDE 14

100 200 300 400 500 600

  • 5.0
  • 4.8
  • 4.6
  • 4.4
  • 4.2
  • 4.0
  • 3.8
  • 3.6
  • 3.4
  • 3.2
  • 3.0

Heat flow (mW)

FA-3

Temperature (

0C)

DSC

200 400 600 800 100 80 60 40 20 Temperature difference(,

0C)

Temperature (

0C)

Weight loss (%) FA-3 DTA TGA

Endo. Exo.