special - Specialty Cements Dr Kimberly Kurtis School of...

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1 Dr. Kimberly Kurtis School of Civil Engineering Georgia Institute of Technology Atlanta, Georgia Specialty Cements Specialty Cements • Portland cements do not always meet every need of the construction industry. • Other specialty cements have been developed to meet these needs. • Generally much smaller production, limited availability, and increased cost. modified portland cements – some particular component has been added to portland cement to provide the desired quality In these cements, the calcium silicates continue to provide the strength, but changes are made to the aluminate and ferrite phases non-portland cements – Do not rely on the calcium silicates for strength, but on the hydration of other phases
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2 Today’s Cements Sulfate-resisting cements Low-heat cements Rapid strength gain cements ASR resistant cements Air-entraining cements Blended cements White or colored cements Masonry cements Mortar cements Expansive cements Rapid setting cements Rapid hardening cements Oil well cements Biogenic cements Calcium-aluminate cements White or Colored Cements Fe, Mg give clinker and cement gray color Can produce white cement if F<0.5% in raw materials Burn clean fuels Controlled cooling to retain Fe 2+ Use ceramic ball mill http://www.svdpla.org/Newsletters/Vincen3.gif
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3 White or Colored Cements Fe, Mg give clinker and cement gray color Can produce white cement if F<0.5% in raw materials Add pigments to white cement to achieve desired color: - red, yellow, brown, black - iron oxides - green - chromium oxide - blue - cobalt blue http://www.ahi-supply.com/speccem.html White cements are ~3x cost of ordinary portland cement Properties of masonry mortars: Workability Water retentivity Consistent rate of hardening Durability Compressive strength •B o n d Volume stability Appearance Composition of masonry mortars: Cementitious material Masonry sand
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4 Masonry cement consists of: Portland cement or blended hydraulic cement Hydrated or hydraulic lime Other materials like talc, clay, fly ash, slag, air entrainers ASTM C 91 Standard Specification for Masonry Cement Mortar cement: Similar to masonry cement Lower air content Bond strength requirement ASTM C 1329 Standard Specification for Mortar Cement Type M Type S Type N Mortars: Type M Type S Type N Type O ASTM C 91 Standard Specification for Masonry Cement ASTM C 1329 Standard Specification for Mortar Cement ASTM C 270 Standard Specification for Mortar for Unit Masonry Masonry & Mortar Cements
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5 14* 20* 75 2.4 (350) O 14* 20* 75 5.2 (750) N 12 18 75 12.4 (1800) S 12 18 75 17.2 (2500) M Mortar cement Or Cement-lime Masonry cement Maximum air content, % Minimum water retention,
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This note was uploaded on 08/23/2011 for the course CEE 8813b taught by Professor Kurts during the Spring '07 term at Georgia Tech.

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special - Specialty Cements Dr Kimberly Kurtis School of...

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