RT journal article
T1 Studying the dosage-dependent influence of hydrophobic alkoxysilane/siloxane admixtures on the performance of repair micromortars
A1 Garcia-Lodeiro, Inés
A1 Gonzalez-Aguza, S.
A1 Zarzuela Sánchez, Rafael
A1 Pardos, Y.
A1 Garcia-Navarro, R.
A1 Tebar, A.
A1 Mosquera Díaz, María Jesús
A1 Blanco-Varela, María Teresa
A2 Química Física
K1 Repair micromortar
K1 Silica oligomers
K1 PDMS
K1 Porosity
K1 Hydrophobicity
AB Cracks sealing in deteriorated concrete often requires the use of repair mortars of compatible composition, good adhesion to the substrate and free of shrinkage. Even where repair mortars properly bond to the substrate, that interface affords a preferred pathway for water ingress. Hydrophobic repair micromortars designed to seal cracks via injection might be one way to solve that problem. This article analyses the effect of adding three hydrophobic products (generic labelled as UCA-TP) comprising silica oligomers, n-octylamine (a surfactant) and polydimethylsiloxane (PDMS) in different proportions (10 wt% of PDMS :UCA-TP10, 28 wt% of PDMS: UCA-TP28 and 56 wt% of PDMS: UCA-TP56) to a fresh repair micromortar. The incorporation of UCA-TP products hastened the early hydration kinetics of repair micromortars, and, at the same time, after 7 days of hydration, declined the total heat released (the higher is the content of UCA-TP product and its proportion of PDMS the lower is the heat of hydration. The inclusion of the hydrophobic products substantially modified the repair micomortar wetting and water transport properties, by inducing a hydrophobic behavior (contact angle >100 degrees) and decreasing water absorption by >60%. Although adding those products to the repair micromortars increased porosity and lowered mechanical performance, 28 d compressive strength was consistently >50 MPa, a value that compared well to the original substrate. Simulated cracks were very effectively sealed by the repair micromortars.
PB ELSEVIER
SN 2352-7102
YR 2022
FD 2022-05
LK http://hdl.handle.net/10498/26912
UL http://hdl.handle.net/10498/26912
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026