The performance of silane-based surface treatment for the protection of degraded historical concrete

The protective effect of several silica-based materials on historical concrete was evaluated. Different materials exhibit different properties Some materials may cause damage to preservation.
surface treatment is an effective way to protect existing historic concrete buildings from decay
the
. Silane-based products can be considered effective protective materials to improve the durability of concrete. However, preservation damage such as changes in the appearance of the surface coating and expansion stress has been reported. In addition, the long-term effects of silane coatings have not been fully studied.
accelerated aging testing
three commercial silicone alkyl products are applied to concrete samples in order to assess the efficiency of surface treatment and select the appropriate materials to protect historical concrete. The performance of concrete surface treatment in appearance change, contact angle, pressure resistance, penetration depth and aperture distribution was studied. Conduct accelerated aging tests to fully understand the long-term preservation properties of commercial coatings.
products show protective functions
the results show that all three commodities are protective and have little change in appearance. However, some materials may cause white salt crystallization on the concrete surface, and strong hydrophobicity can easily produce stress, which eventually accelerates the decay of the concrete.