Mineral Admixtures of Cement
Mineral Admixtures of Cement
1. Pozzolanas
2. Ground Granulated Blast Furnance Slag
1. Pozzolanas :-
Pozzolanic materials conforming to relevant Indian Standard may be used with the permission of the authority, providing uniform blending with cement is ensured.
Fly ash conforming to Grade 1 of Indian Standard 3812 may be used as part replacement of ordinary Portland cement provided uniform blending with cement is ensured.
b):- Silica fume
The silica fume (very fine non-crystalline silicon dioxide) is a by-product of the manufacture of silicon, ferrosilicon or the like, from quartz and carbon in electric arc furnace. It is usually used in proportion of 5 to 10 % of the cement content of a mix.
{Silica fume conforming to a standard approved by the deciding authority may be used as part replacement of cement provided uniform blending with the cement is ensured}.
c):- Rice husk ash
Rice husk ash is produced by burning rice husk and contain large proportion of silica. To achieve amorphous state, rice husk may be burnt at controlled temperature.It is necessary to evaluats the product from a particular source for performance and uniformity since it can range from being as deleterious as silt when incorporated in concrete. Water demand and drying shrinkage should be studied before using rice husk.
{Rice husk ash giving required performance and uniformity characteristics may be used with the approval of the deciding authority}.
d):- Metakaoline
Metakaoline having fineness between 700 to 900 sqm/kg may be used as pozzolanic material in concrete.
Metakaoline is obtained by calcination of pure or refined kaolintic clay at a temperature between 650'c and 850'c, followed by grinding to achieve a fineness of 700 to 900 sqm/kg the resulting material has high pozzolanicity.
2. Ground Granulated Blast Furnance Slag
Ground Granulated Blast Furnance Slag obtainedby grinding granulated blast furnace slag conforming to Indian Standard 12089 may be used as part replacement of ordinary portland cement provided uniform blending with cement is ensured.A Good Quality Construction is a Result of Good Knowledge. Keep Learning....Keep Growing....
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