1. Carbon sequestration in concrete

2. Karl Peterson

3. Carbon sequestration in concrete Karl Peterson Asst. Research Professor

4. Carbon sequestration in concrete Karl Peterson Asst. Research Professor Dept. of Civil & Environmental Engineering

5. Carbon sequestration in concrete Karl Peterson Asst. Research Professor Dept. of Civil & Environmental Engineering Microstructure of building materials

6. Carbon sequestration in concrete Karl Peterson Asst. Research Professor Dept. of Civil & Environmental Engineering Microstructure of building materials (especially concrete)

7. Carbon sequestration in concrete Karl Peterson Asst. Research Professor Dept. of Civil & Environmental Engineering Microstructure of building materials (especially concrete) Why concrete?

8. Because we use a lot of it.

9. But there’s a problem…

10. For every three cubic meters of concrete,

11. one metric ton of carbon is emitted.

12. For every three cubic meters of concrete, one metric ton of carbon is emitted.

13. (and that’s just considering the process of cement production)

14. CaCO 3 + heat → CaO + CO 2

15. (heat from burning coal, even more CO 2 )

16. Fortunately, a portion of the emitted CO 2 is re-absorbed by the concrete.

17. Hydrated cement + CO 2 → CaCO 3

18. (but takes a while)

19. The Pantheon of Rome, 125 A.D.

20. Concrete dome completely carbonated after 2,000 years

22. Recovered carbon, as of now.

23. Recovered carbon, 25 years from now.

24. Recovered carbon, 50 years from now.

25. Recovered carbon, 100 years from now.

26. Recovered carbon, 500 years from now.

27. Recovered carbon, 1000 years from now.

28. Recovered carbon, 1500 years from now.

29. Carbon sequestration in concrete

30. How can we speed things up?

31. Carbon sequestration in concrete How can we speed things up? Encapsulating CO 2 during construction.

32. Carbon sequestration in concrete How can we speed things up? Encapsulating CO 2 during construction. Increasing the permeability of the hydrated cement paste.

33. Carbon sequestration in concrete How can we speed things up? Encapsulating CO 2 during construction. Increasing the permeability of the hydrated cement paste. Introduction of nano-bacteria.

37. Why?

38. Introduction of nano-bacteria. Why? Because Michigan Technological University is a leading public research university, conducting research, developing new technologies and preparing students to create the future for a prosperous and sustainable world.