RT journal article
T1 Water-soluble fluorosilane supplemented with fumed silica as admixture for producing hydrophobic concrete: Effects on cement hydration, mechanical properties and water protection properties
A1 González-Coneo, Jorge
A1 Zarzuela Sánchez, Rafael
A1 Luna Aguilera, Manuel Jesús
A1 Mosquera Díaz, María Jesús
A2 Química Física
K1 Concrete
K1 Hydrophobic
K1 Waterproofing
K1 Silanes
K1 Admixture
K1 Cement hydration
AB Hydrophobic admixtures protect concrete from water-related degradation, although they may have negative effects over cement hydration, mechanical properties and have low miscibility with water. Aiming to overcome these drawbacks, this work studies the properties of concretes containing admixtures based on a water-soluble fluoroalkylsilane and fumed silica to densify the structure. The effects of the admixture were evaluated in terms of hydrophobic, mechanical and chemical properties. The admixture decreased capillary absorption by over 70% while also increasing the internal cohesion, despite an increased porosity. Raman and XRD analysis indicated it promoted the consumption of C3S and the formation of portlandite and C–S–H gels with higher silicon content, compensating the effect of porosity on the concrete resistance. Incorporation of fumed silica in the admixture delayed the early development of hydrated phases, but after full curing promoted a more compact structure of the cement matrix, decreasing water absorption rate and improving mechanical properties.
PB ELSEVIER
SN 2666-1659
YR 2024
FD 2024
LK http://hdl.handle.net/10498/32731
UL http://hdl.handle.net/10498/32731
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026