The Performance of Crystalline Hydrophobic in Wet Concrete Protection

Mujib Rahman, Denis Chamberlain

Research output: Contribution to journalArticlepeer-review


Reflecting the need to protect concrete structures from deicing salt and freeze-thaw loading, the study introduced in this paper springs from the uncertainty that exists in the benefit of in situ performance of isobutyl silane as a protection material. It is likely that environmental loading and internal moisture at the time of application are the main contributory factors for underperformance. This paper deals with alternative materials—a high-solids silane and an aqueous crystallization solution—operating by a moisture-driven crystallization mechanism rather than demanding a dry application regime. The results demonstrated similar substantial performance reduction of both materials at 0–5% moisture on medium-strength (C25: 25  N/mm2) and high-strength (C40: 40  N/mm2) concrete. There is greater take-up of protection materials by C25 concrete than by C40 concrete, together with greater chloride reduction, indicating that the level of achieved dosing is a significant factor. The similarity between the absorption of water and of the two protection materials relative to initial water content points to a possible basis for predicting achievable dosing of surface-applied protection materials. The crystallization material achieved greater application volume and chloride reduction than the silane material.
Original languageEnglish
JournalJournal of Materials in Civil Engineering
Issue number6
Early online date27 Jan 2017
Publication statusPublished - Jun 2017


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