Calcined clay limestone cement (lc3)

ACADEMIC WRITING

1. Subjective Assignment 2 AW BY S AJITH KUMAR APPLICATION ID: 440db885e76f11e9bdedbd5fd00aa9e7 SASTRA Deemed to be University Thanjavur

2. I pay my gratitude to Academic Writing course which taught me how to write a research article and how to publish an article without plagiarism and also about the digital writing. I thank my parents and almighty for their blessings and grace 26-Oct-19 2 ACKNOWLEDGEMENT

3. PRESENTAION ON CALCINED CLAY LIMESTONE CEMENT (LC3) REPLACEMENT IN CEMNT

4. The use of supplementary cementitious materials (SCMs) to replace part of the clinker in cement is the most successful strategy to reduce CO2 emissions in the global cement industry . The only type of material available in the quantities needed to meet demand is clay containing kaolinite, which can be calcined to produce an effective SCM. 26-Oct-19 4 INTRODUCTION

5. It reduce the clinker amount about 50%. Less amount of CO2 evolved. Give similar strength and durability compared to normal OPC cement. Better chloride resistance. ASR resistance. 26-Oct-19 5 PURPOSE

6. Illite Montmorillonite Kaolinite 26-Oct-19 6 TYPES OF MINERALS IN CLAY

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8. The reactivity of the calcined clay is overwhelmingly dependent on the kaolinite content of the clay. Clays containing about 40 % kaolin or above give strengths comparable to plain Portland cement when used in LC3-50. 26-Oct-19 8

9. 26-Oct-19 9 CALCINATION

10. Clay is calcined by heating to around 700–850 ° C. clay containing kaolinite is calcined, metakaolin is formed which is essentially an amorphous alumino silicate (Al2Si2O7 ). 50% clinker, 30% calcined clay, 15% limestone and 5% gypsum is taken into the grinding mill. 26-Oct-19 10 Preparation of cement

11. Kaolinite and Bogue’s compounds undergo hydration process and form C-S-H and C-A-S-H gel. Due high presence of aluminates it first undergo hydration and increase the setting property of cement Final setting time of LC3 cement is 6 hours 30 mins. 26-Oct-19 11 Hydration

12. C3S and C2S undergo hydration forms the C-S-H gel and calcium hydroxides . Then the calcium hydroxide reacts with the aluminates and silica present in the kaolinite and form C-A-S-H gel. 26-Oct-19 12 Hydration

13. 26-Oct-19 13 Heat of Hydration

14. In LC3-50 blends , calcined clays with a high original kaolinite content give a low pore threshold radius of about 10 nm at 3 days . It have a pore structure finer than pastes made with Portland cement. 26-Oct-19 14 Porosity

15. Chloride ion penetration for mortars of plain Portland cement (PC), and LC3-50 blends with calcined clays of different kaolinite content subjected to ponding in 3 wt % NaCl for 1 and 2 years, is presented in Fig. The penetration depth is 10 mm or less. 26-Oct-19 15 Resistance to chloride penetration

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17. Give similar strength and durability even with the reduction in the 50 % of clinker. The materials seem to have particular advantages with respect to limiting chloride ingress and alkali silica reaction . Reduce the emission of CO2 by 30%. 26-Oct-19 17 Conclusion

18. Minimize the air pollution. Usage of natural limestone reduced due to higher percent of SCM is added. Due to reaction of aluminates setting time increases with the increase in heat of hydration. 26-Oct-19 18 Summarize

19. THANK YOU 26-Oct-19 19