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

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

PHYSICAL CHARACTERIZATION Image Analysis System

Gradational analysis 1 0 0 1 0 0 O L A A L A 6 8 0 8 0 6 0 6 0 % finer 4 0 4 0 2 0 2 0 0 0 1 E -3 1 E -3 0 .0 1 0 .0 1 0 .1 0 .1 1 1 1 0 1 0 P a r t i c l e s i z e ( m m ) Ultra-sieves

Soft Imaging (Laser Particle Scanning) 5000 4500 4000 SF 3500 3000 2500 2000 1500 Number of particles 1000 500 0 1600 1400 FA 3 1200 1000 BFS 800 600 400 200 0 1400 1200 FA 1 1000 FA 2 800 600 400 200 0 0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 Particle size (  m)

Property FA 1 FA 2 FA 3 GGBFS SF G 2.03 2.3 2.38 2.84 2.1 Specific surface area 2988 3602 5048 4073 200000 (cm 2 /g) Sand size (>4.75 mm) % 0 0 0 0 ** Silt size (0.002-0.075 mm) % 100 95 90 97 ** Clay size (<0.002 mm) % 0 5 10 3 ** ** Not applicable Number of particles Percentage of particles Particle size FA-1 FA-2 FA-3 GGBFS SF FA-1 FA-2 FA-3 GGBFS SF Range (  m) 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 0 0.3 0.0 21.0-24.0 2 0 0 5 3 0.1 0 0 0.3 0.1 24.0-27.0 1 1 0 2 3 0.1 0 0 0.1 0.1 27.0-30.0 2 1 1 5 2 0.1 0 0 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 0.1 0.2 0 36.0-39.0 1 0 0 0 0 0.1 0 0 0 0

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

SEM Photographs of Activated ash samples

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

(Original ash samples) SEM Micrographs

He gas pycnometer MIP

Blaine’s Air Permeability Apparatus (ASTM C 204) Portland cement as a standard reference material Specific-surface area (S B )  3 S (1 e ) e T  S s S B  3 e T (1 e) s s S s is the SSA of cement (= 0.346 m 2 /g) e is the void ratio of the sample e s is the void ratio of cement (= 0.5) T s is the time of manometer drop for cement (= 77.18 s) T is the time of manometer drop for the sample

Thermo Gravimetric Analysis

0 TGA Exo. 20 Weight loss (%) Temp. difference ( T) (Dry air atmosphere) 40 DTA 60 Endo. 80 OLA ALA6 TGA and DTA curve 100 for OLA and ALA6 0 samples T e m p . d i f f e r e n c e ( T ) E x o . T G A 20 W e i g h t l o s s ( % ) 40 60 D T A (Inert atmosphere) 80 O L A E n d o . A L A 6 100 400 800 600 200 0 C ) T e m p e r a t u r e (

0 -3.0 FA-3 0 C) -3.2 DSC TGA Temperature difference(  , FA-3 20 -3.4 Weight loss (%) -3.6 Heat flow (mW) 40 -3.8 Exo. -4.0 60 -4.2 DTA -4.4 Endo. 80 -4.6 -4.8 100 -5.0 0 200 400 600 800 0 100 200 300 400 500 600 0 C) Temperature ( 0 C) Temperature (