RT journal article
T1 Multifunctional silane-based superhydrophobic/impregnation treatments for concrete producing C-S-H gel: Validation on mockup specimens from European heritage structures
A1 Zarzuela Sánchez, Rafael
A1 Luna Aguilera, Manuel Jesús
A1 González-Coneo, Jorge
A1 Gemelli, Giada María Chiara
A1 Andreouli, Dia
A1 Kaloidas, Vasilis
A1 Mosquera Díaz, María Jesús
A2 Química Física
AB Many of the concrete structures that conform our modern cultural heritage are in need of repair and protective interventions. Silane-based impregnation treatments can be used to repair onset cracks and reinforce the surface due to their ability to produce silica and C-S-H gels, and can be modified by incorporating hydrophobic precursors to create multifunctional treatments that also protect from water ingress. Since the effectiveness of impregnation treatments is dependent on substrate properties and chemical-physical changes it may have experienced over time, validation using standard materials may not always be representative of on-site application. In this work, the effectiveness of three innovative silane-based impregnation treatments developed by our group (two of them combining superhydrophobic properties) was evaluated on mockup specimens, which simulate the properties of the cementitious materials from six different heritage structures across Europe, artificially aged to simulate weathering by three methods: carbonation, chloride ingress and physical damages (freeze–thaw and thermal cycles). The characterization of the treatments showed they are compatible in terms of chemical interaction, applicability and minimal aesthetical alterations. Surface resistance and ultrasound pulse measurements have been used to assess the improvement in mechanical properties. The incorporation of hydrophobic components and fumed silica has a relatively low impact over the mechanical properties while it significantly reduces water absorption and grants water repellent properties to the surface, giving rise to a superhydrophobic performance. © 2022 The Authors
PB ELSEVIER
SN 0950-0618
YR 2023
FD 2023-02
LK http://hdl.handle.net/10498/27884
UL http://hdl.handle.net/10498/27884
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026