Comparative study of pozzolanic activity of ultrafine pozzolana

Accelerated pozzolanic activity of various ultrafine materials like silica fume, metakaolin and microfine cement(ultra fine slag) with different percentage level of replacement has been compared. There is increase of 14% to 40% increase of pozzolanic index with the incorporation of ultrafine pozzolanic material. Maximum gain in strength has been observed in case of microfine. With the use of superplasticizer there is gain of about 40% in accelerated pozzolanic activity of microfine compared to control. With 7.5% silica fume the pozzolanic activity is comparable to 7.5% of microfine.