A: Visual and roughness changes in a group PS (physically pre-stressed) block after the experimental weathering phase, showing incipient salt weathering near the base and vein-like micro-cracks on the top surface. B: Three-dimensional (3-D) false-colored topographic image (50×) of a PS block after desalination, showing vein-like micro-cracks as shallow grooves. C: Same spot on block surface as in B, showing brownish, vein-like micro-cracks (50×). D: Group CA (chemically pre-treated) block after experimental weathering showing distinct surface pitting. E: 3-D false-colored topographic image (50×) of CA block after desalination showing depth of pitting. F: Same spot as in E, showing clear pitting (50×). G: Control (C) block before weathering experiment. H: 3-D false-colored topographic image (50×) of control block showing very low surface relief. I: Same spot as in H, showing regular, straight cutting traces (50×).