mkgrad - Metakaolin Lauren McCormick CEE 8813 Material...

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1 Metakaolin Metakaolin Lauren McCormick Lauren McCormick CEE 8813 CEE 8813 – Material Science of Concrete Material Science of Concrete Dr. Kimberly Dr. Kimberly Kurtis Kurtis 04/04/2007 04/04/2007
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2 Outline { Introduction { Production { Properties { Pozzolanic Reaction { Hydration z Heat and Rate of Heat Evolution { Pore Size Distribution and Chemistry { Workability { Mechanical Properties { Durability
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3 Metakaolin (MK) { Highly reactive amorphous alumino-silicate SCM { ASTM C618 Class N=natural pozzolan (pure form) { Pure or Impure form, depends on refinement { Structural z Bridge decks, piers, durability issues, HPC toxic material storage (Sabir, 2001) { Architectural z white color, exposed concrete Jubilee Church – Rome, Italy: MK with white cement (Englehard, 2007)
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4 Metakaolin Production { Produced from kaolin, a white clay (Whitemud Resources, Inc., 2007) { Kaolin quarries in Wood Mountain, Canada { Deposits also in GA, between Columbus and Augusta
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5 Metakaolin Production { MK is a primary product (SF and FA are secondary products) z Produced under controlled process to achieve desired properties 1) Kaolin is mined and crushed 2) Kaolin separated from sand, refined to remove impurities and stored 3) Kaolin is fed into rotary kiln to produce metakaolin 4) MK is crushed to a fine powder and stored (Whitemud Resources, Inc., 2007)
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6 Metakaolin Production { Heat kaolin between 650-800 °C to form MK { Process called dehydroxylation (Justice, 2005) { Overheating or overcalcined results in recrystallization and metakaolin begins converting to inert nonreactive materials
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7 Properties { Composition: 50-55% SiO 2 & 40-45% Al 2 O 3 { Surface Area=10,000-25,000 m 2 /kg { Avg. Particle Size = 80%<2μm { Density = 2600 kg/m 2 { Specific Gravity = 2.5 { Particle Shape = Angular { COST : $500/t (cement $100/t) (Justice, 2005) (Whitemud Resources, Inc., 2007) (Al-Akhras, 2006)
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8 Pozzolanic Reaction Al 2 O 3 ·(Si 2 O 2 ) 2 +CH+H metakaolin CSH + C 4 AH 13 3 AH 6 = hydrated calcium aluminates + C 2 ASH 8
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mkgrad - Metakaolin Lauren McCormick CEE 8813 Material...

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