BMA, 24-26 March 2009

Hydration of cements from  Hydration of cements from synchrotron X‐ray powder diffraction  Miguel A. G. Aranda University of Málaga, Spain

e-mail: e mail: [email protected] g [email protected]

Environmental problem: Belite cements A suitable i bl approach h to solution l i

BMA, 24-26 March 2009

Green house g gases: CO2, etc.

CaCO3

Δ

CaO + CO2

0 54 Tons / ton of 0.54 f clinker l k

Belite Portland clinker

Ordinary Portland clinker 60

50

~60%

C 3S

20

C2S

50

40

30

~60%

60

40

~15%

C 2S

~10%

C4AF

~10%

C 3A

30

20

10

10

0

0

~15% C3S

~10% C4AF

~10% C3A

1/32

Belite cements may reduce 10% de CO2 emissions

BMA, 24-26 March 2009

but belite reactivity with water is slow Activation of belite cements is needed

weakness Sulfo-ferroaluminate-belite cement

Hi h fferro-belite High b lit cementt