Water self-diffusion in the nanopores of C-(A)-S-H,the binding phase of Portland cement and of low CO2 cement formulations
At the global scale, cement is the single most manufactured material, and responsible of 5-7% of the global emissions of CO2 to the atmosphere. Among all the cement components, calcium silicate hydrates (C-S-H) is the main binding phase. New formulations of low-CO2 cements include Al substitutions, yielding C-A-S-H. In spite of the widespread use of cement materials, the poorly crystalline character of C-(A)-S-H has prevented a detailed characterization of its structural and dynamical characteristics, preventing as well the characterization of the structure and dynamics of the different water components. Only few studies hae addressed water dynamics in C-S-H nanopores but without an specific care of the sample preparation. Here, we propose QENS experiments to probe the water dynamics in C-S-H and C-A-S-H under different water humidities, using a controlled sample preparation protocol combined with water vapor isotherms, TGA and other characterization. The results will be key to characterize water dynamics in the different pores of these materials. Water dynamics influence carbonation and creep processes, which are responsible for the strength loss in cements.
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FERNANDEZ MARTINEZ Alejandro; APPEL Markus; ASTA ANDRES Maria Pilar; CAMPILLO Sylvain; CUELLO Gabriel; MASCI Lorella; ROLS Stephane; TRUCHE Laurent; VAN DRIESSCHE Alexander and ZHAKIYEVA Zhanar. (2020). Water self-diffusion in the nanopores of C-(A)-S-H,the binding phase of Portland cement and of low CO2 cement formulations. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-07-54
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