کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
259263 | 503631 | 2011 | 8 صفحه PDF | دانلود رایگان |
The use of calcined clay, in the form of metakaolin (MK), as a pozzolanic material for mortar and concrete has received considerable attention in recent years. The present paper describes the results of a research project initiated to study the calcination of local kaolin at various temperatures (650–950 °C) and durations (2, 3 and 4 h) to produce MK with a high pozzolanic activity. The pozzolanic activity was assessed by 28-days compressive strength and hydration heat methods. The maximum identified activity was obtained at 850 °C for 3 h duration. An increase of both hydration heat and compressive strength was obtained when ordinary Portland cement was replaced by 10% MK. The use of ternary blended cement improves the early age and the long-term compressive strength. The durability was also enhanced as better acidic resistance was observed.
Research highlights
► The maximum activity of the heat treated kaolin was obtained at 850 °C for 3 h.
► 10% metakaolin increases both hydration heat and compressive strength.
► Ternary blended cement improves early age and long-term compressive strength.
► Durability of metakaolin mortar mixes was enhanced.
Journal: Construction and Building Materials - Volume 25, Issue 5, May 2011, Pages 2275–2282