RT Journal Article
T1 Portland and belite cement hydration acceleration by C-S-H seeds with variable w/c ratios
A1 Mazanec, Oliver
A1 Borralleras, Pere
A1 Weldert, Kai S.
A1 Gastaldi, Daniela
A1 Canonico, Fulvio
A1 Morales-Cantero, Alejandro
A1 Cuesta-García, Ana María
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 García-Aranda, Miguel Ángel
K1 Química inorgánica
K1 Silicatos
K1 Dióxido de carbono
K1 Aceleradores de partículas
K1 Sulfatos minerales
K1 Cemento
AB The acceleration of very early age cement hydration by C-S-H seeding is getting attention from scholars and field applications because the enhanced early age features do not compromise later age performances. This acceleration could be beneficial for several low-CO2 cements as a general drawback is usually the low very early age mechanical strengths. However, the mechanistic understanding of this acceleration in commercial cements is not complete. Reported here is a contribution to this understanding from the study of the effects of C-S-H gel seeding in one Portland cement and two belite cements at two widely studied water–cement ratios, 0.50 and 0.40. Two commercially available C-S-H nano-seed-based admixtures, i.e., Master X-Seed 130 and Master X-Seed STE-53, were investigated. A multi-technique approach was adopted by employing calorimetry, thermal analysis, powder diffraction (data analysed by the Rietveld method), mercury intrusion porosimetry, and mechanical strength determination. For instance, the compressive strength at 1 day for the PC (w/c = 0.50) sample increased from 15 MPa for the unseeded mortar to 24 and 22 MPs for the mortars seeded with the XS130 and STE53, respectively. The evolution of the amorphous contents was determined by adding an internal standard before recording the powder patterns. In summary, alite and belite phase hydrations, from the crystalline phase content evolutions, are not significantly accelerated by C-S-H seedings at the studied ages of 1 and 28 d for these cements. Conversely, the hydration rates of tetracalcium alumino-ferrate and tricalcium aluminate were significantly enhanced. It is noted that the degrees of reaction of C4AF for the PC paste (w/c = 0.40) were 10, 30, and 40% at 1, 7, and 28 days. After C-S-H seeding, the values increased to 20, 45, and 60%, respectively...
PB Materials
YR 2022
FD 2022
LK https://hdl.handle.net/10630/24149
UL https://hdl.handle.net/10630/24149
LA eng
NO Morales-Cantero, A.; Cuesta, A.; De la Torre, A.G.; Mazanec, O.; Borralleras, P.; Weldert, K.S.; Gastaldi, D.; Canonico, F.; Aranda, M.A.G. Portland and Belite Cement Hydration Acceleration by C-S-H Seeds with Variable w/c Ratios. Materials 2022, 15, 3553. https://doi.org/10.3390/ ma15103553
NO This research has been partly supported by a P18-RT-720 research grant, co-funded by ERDF, from Junta de Andalucía, Spain.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026