Proceedings of the 4th international conference on knowledge and innovation in Engineering, Science and Technology
Influence of the Calcination Thickness of Kaolin on Strength Development of Mortars
Methawee Sriwattanapong Photisan
This research aims to improve local pozzolan material, kaolin, by investigating the effect of calcination thickness of kaolin to produce metakaolin with a high pozzolanic reactivity. Kaolin samples of the same mass were treated at 800◦C for the same duration of 6 h by varying the calcination thickness of kaolin samples from 1 cm, 5 cm, and 10 cm in order to obtain metakaolins which were used to partially replace ordinary Portland cement (OPC) at the replacement of 20% by weight of binder. The results indicated that the optimal activation calcination layer was 10 cm. The XRD analysis confirmed pozzolanic activity of developed metakaolin. In addition, it was observed that the activated metakaolin had an appreciable influence on the increase in compressive strength of the mortars.
Keywords: Calcination, Compressive strength, Kaolin, Metakaolin, Thickness.