FORMATION OF CEMENT MORTAR BY USING PAPER MILL LIME SLUDGE

Abstract

The process of calcination i.e. heating to the raw lime sludge in the furnace at various temperatures has transmuted kolinite to metakaolin. After heating to lirnesludge of paper mill at 650 - 750 °C highly reactive pozzolanas have been produced. The OPC (ordinary portland cement) have been partially substituted by lime sludge with 5. 10, 15, 20, 25, 30. 35, 40, 45, 50 wt. %. Cement pastes were prepared by using standard consistency method as per IS 4031 (Part 4)1988. The cubes of cement mortar were made by using lime sludge, triple graded sand, and cement in the varying proportions. The dimensions of cubes were 5 cm X 5cm X 5 cm. The casted cubes were treated for moist curing for the duration of 24 h and after that cubes were put into the curing tank that was filled with fresh water. An increase in the compressive strength of the cubes of cement mortar was observed with the replacement of lime sludge of paper and pulp mill over the cement cube mortar without lime sludge. The maximum gain in the strength properties of the cement mortar was achieved at 15% (by wt %) substitution of OPC with lime sludge. The increase in strength was caused due to accumulation of increase amount hydrates of calcium silicate (CSI-1) and hydrates of tetra calcium aluminates (TAH). Utilization of these wastes have been great impact to reduce environmental load in last decades and further these may be used as supplementary cementitious materials as building products.