2019 Volume 73 Issue 1 Pages 229-236
In this study, a water permeability test, determination of neutralization depth by sulfuric acid and amount of sulfate ion penetration, and measurement of the Vickers hardness were performed using mortar impregnated with two kinds of silicate-based surface penetrants in order to evaluate the influence of silicate-based surface penetrants on sulfuric acid degradation. The shape of the mortar impregnated with the surface penetrants was maintained after sulfuric acid degradation. It was suggested that the use of the sodium silicate-based surface penetrants was suppressed the water permeability, the neutralization depth by the acid, and amounts of sulfate ion penetration because of suppression of surface porosity due to the remain of insoluble salts on the mortar surface after the sulfuric acid degradation. The sulfuric acid degradation at pH 2 in this study condition did not greatly affected the Vickers hardness of mortar. Therefore, it was considered that the modification effect by silicate-based surface penetrants was maintained after sulfuric acid degradation. As the results, it was suggested that the surface penetrants had the sufficiently modification effect on mortar even after the sulfuric acid degradation.
