CO2 CAPTURE AND STORAGE IN CONCRETE GENERATED THROUGH EARLY-AGE CABONATION OF CALCIUM SILICATE HYDRATE

Lucian Paunescu; Sorin Mircea Axinte; Eniko Volceanov; Ioana Adrian; Bogdan Valentin Paunescu

Lucian Paunescu Daily Sourcing & Research SRL Bucharest
Sorin Mircea Axinte Politehnica University of Bucharest
Eniko Volceanov Politehnica University of Bucharest
Ioana Adrian Politehnica University of Bucharest
Bogdan Valentin Paunescu Consitrans SA Bucharest

Keywords: CO2 sequestration, C-S-H, untimely carbonation, sodium bicarbonate, cement, mechanical strength

Abstract

Recent global research on the sequestration and definitive storage of CO₂ into concrete due to untimely carbonation of hydrated Ca₂SiO₄ (known as C-S-H), the most important phase of ordinary cement, has piqued the interest of authors of this paper. Limiting the gas footprint released into the atmosphere remains a very topical objective in the world and implicitly, also of the authors. Sodium bicarbonate (NaHCO₃) added into starting mix as a partial substitute for cement has already been identified as the suitable option to reach the objective. Another very interesting effect has been experimentally highlighted in the direction of increasing the mechanical resistance particularly, at an early-age of the concrete preparation. Specific measurements carried out after only 6 hours has found very high values of compression and flexural strength, close to the values corresponding to the end of concrete curing process of 28 days. This procedure has not yet been finalized in technological terms in the world. Its importance lies in the possibility of manufacturing without CO₂ emissions and utilizing the traditional Portland cement as the main binder for construction concrete in the current situation of world environmental crisis.

References

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CO2 CAPTURE AND STORAGE IN CONCRETE GENERATED THROUGH EARLY-AGE CABONATION OF CALCIUM SILICATE HYDRATE

Abstract

References

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