In order to quantitatively evaluate the reforming effect of the silicate-based surface penetrants on the mortar, silicate-based surface penetrants were applied to the mortar and a Vickers hardness test was carried out. The test factors were the W/C of the mortar, the amount of the silicate-based surface penetrants used, the main component of the silicate-based surface penetrants, the molar ratio of the silicate-based surface penetrants, and the surface water content of the mortar. In the Vickers hardness test, the amount of increase in Vickers hardness and the range of increase in Vickers hardness (reforming depth) were used as evaluation items. From these series of results, the effects of each test factor examined on the increase in Vickers hardness and the reforming depth due to the application of the silicate-based surface penetrants were summarized. The increase in surface moisture content affected both the amount of increase in Vickers hardness and the depth of reformation. The W/C of the mortar affected the increase in Vickers hardness. In addition, the amount of surface penetrants used and the main component of the surface penetrants affected the reforming depth.
