Characterization of silicate sealers on concrete

Long-term performance of surface impregnation of reinforced concrete structures with silane

“…The organic alkylic (CH 3 ) group remaining will protrude from the pore structure and are responsible for the hydrophobic characteristics [5][6]. Evidence from numerous studies demonstrate that the application of silanes significantly reduces water uptake, which as a result reduces the ingress of chlorides and hence also reduces the corrosion risk to the reinforcement [6,9,[12][13][14][15][16][17][18]. However, their performance is affected by surface imperfections, cyclic wetting and drying, skill of the applicator, surface preparation, application rates and local environmental conditions at the time of application.…”

The investigation of factors affecting the water impermeability of inorganic sodium silicate-based concrete sealers

“…Theoretically, when the sodium silicate-based concrete sealers permeate into the concrete surface, the reaction between the active sodium silicate and the portlandite in the cement matrix occurs as follows [4,7,11,12,10,13]:…”

“…Therefore, in recent years, different surface protection treatments for concrete have been adopted to prevent the penetration of water into concrete structures, so that the durability of both new and existing concrete structures can be extended [7]. Of the commonly used protective surface treatments, sodium silicate-based concrete sealers (also referred to as concrete impregnations) has attracted extensive attention from both academia and industry due to the following advantages: they react with portlandite in the cement matrix to form inorganic calcium-silicate hydrates (CASAH gels) [11,12,10] and hence avoid aging problems; the durability of the surface treatments is increased [12], and the waterproofing effect is nearly permanent; they are waterborne and thus environmentally friendly.…”

“…Even though sodium silicate-based concrete sealers are relatively frequently used in civil engineering [7], to date, there appear to be only a small number of studies that are related to their performance [7,12,10], little or no attention has been paid to the http manufacturing process of the sodium silicate-based concrete sealers, and the exact mechanisms by which the concrete sealers act to improve the performance of concretes are unclear [7,11,12,10]. Furthermore, even in these limited papers, the experimental data on the waterproofing properties of sodium silicate-based impregnations are quite different.…”

Bio-réparation des matériaux cimentaires : les bactéries au service des mortiers fissurés

“…Toutefois, bien qu'une diminution de la concentration en oxygène dans la solution bactérienne aitété observée (résultats non montrés), ces résultats prometteurs sontà nuancer par la présence de la concentrationélevée en silicate de sodium dans la solution. En effet, la solution alcaline de silicate de sodium peut réagir avec la portlandite de la matrice cimentaire pour former un gel insoluble de silicate de calcium [16] et ainsi contribuer en partie au remplissage des fissures. La composition de la solution de réparation doit doncêtre optimisée avant le test sur une structure réelle.…”