Technical Information

Grace’s Metakaolin High Reactivity Metakaolin Concrete Admixture ASTM C-618 Class N

Benefits Grace’s metakaolin concrete additive offers many benefits without darkening light-colored cement-based products:

• Increases compressive strength • Increases tensile strength • Increases flexural strength • Improves durability • Improves efflorescence control • Reduces permeability • Reduces ASR degradation Manufacturing Site Grace’s metakaolin is a high-quality, high-reactivity aluminosilicate pozzolanic additive which significantly enhances the performance Grace’s metakaolin is manufactured at the Grace site in Aiken, of concrete. South Carolina, USA where the raw material, Kaolin clay is mined and subsequently thermally activated through a highly controlled Unlike other pozzolonic materials (silica fume, coal fly ash, rice hull calcination process. ash, blast-furnace slag) which are by-products of industrial processes, Grace’s metakaolin is manufactured in a tightly controlled process to Kaolin is found in vast sheet-like deposits across Aiken County, South produce a consistent, highly-reactive, off-white pozzolonic additive Carolina. Kaolin is also found in many other parts of the world, but which will not darken light-colored, cement-based products. This generally not in the uniformity, quantity, and quality of the deposits material meets the specifications of ATM C-618 Class N pozzolans. across South Carolina. Formation of the kaolin deposits in this area is believed to be the result of weathering and erosion of granite in the Application Appalachian Mountains more than 60 million years ago.

Grace’s metakaolin increases the compressive, tensile and flexural strength of concrete, mortars, and cement grouts by reacting with the calcium hydroxide which is a byproduct of the cement hydration process. Metakaolin is much more reactive than most other pozzolans. By replacing 5-15% of the cement by weight with Grace’s metakaolin, the strength of the concrete can be greatly enhanced. Grace’s metakaolin decreases porosity and permeability which results in a more durable concrete with higher chemical resistance.

Grace’s metakaolin manufacturing facility is ISO 9001:2008 certified.

1 Mechanism Typical Properties Grace’s metakaolin improves concrete strength by reacting with free lime Below are typical properties of Grace’s metakaolin. (calcium hydroxide) produced during the hydration of cement to produce calcium silicate hydrate (CSH) which is additional cementitious material. Property Value

Physical Form Fine Powder Chemical Structure Amorphous Aluminosilicate Special Modifications Dehydroxylated (Calcined) Kaolin Specific Gravity 2.6 Bulk Density, Tamped @ 20°C 500 kg/m3 Color Off-white Average Particle Size 5 μm pH 5 Surface Area Units 22 m2/gm Screen Residue, 325 mesh 10 Oil Absorption 75 Moisture % @ 105°C 0.5 GRACE’s metakaolin magnified at 30,000X *Typical properties should not be used for specification purposes.

Packaging Storage/Handling Grace’s metakaolin is available in 40 lb paper bags (both standard and Grace’s metakaolin bags should be stored in a dry, protected area. repulpable), 48 bags/pallet, 1100 lb and 2200 lb super sacks, and bulk Bulk powder can be stored in cleaned silos. Please consult the Grace’s trucks. metakaolin SDS for recommended personal protection.

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Grace Corporate Headquarters Regional Locations

W. R. Grace & Co.-Conn Latin America Asia/Pacific Europe 7500 Grace Drive São Paulo, Brasil Shanghai, China Worms, Germany Columbia, MD 21044 USA Tel: +55 11.3133.2704​ Tel: +86.21.3325.8288 Tel: +49.6241.40300 Tel: +1.410.531.4000

The information set forth herein is furnished free of charge and based on technical data that Grace believes to be reliable. It is intended for use by persons having technical skill and at their own discretion and risk. Since conditions of use are outside of our control, we make no warranties, express or implied, and assume no liability in connection with any use of this information. GRACE® is a trademark, registered in the United States and/or other countries of W. R. Grace & Co.-Conn. TALENT TECHNOLOGY TRUST is a trademark of W. R. Grace & Co.-Conn. This trademark list has been compiled using available published information as of the publication date of this document and may not accurately reflect current trademark ownership or status. © Copyright 2018 W. R. Grace & Co.-Conn. All rights reserved. DOC045

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