Parede de concreto com fissuras mapeadas por reação álcali-sílica (RAS)

A highly realistic documentary-style close-up photo of a weathered reinforced concrete bridge pier or retaining wall outdoors, showing severe alkali-silica reaction damage. The wall fills most of the frame and is viewed from a slight angle so that both the front face and the left edge are visible. The concrete surface is gray, rough, aged, and stained, covered with a dense network of large irregular polygonal map cracks with approximately 18 clearly visible major crack cells across the surface. Many cracks have pale white gel-like seepage and chalky deposits along the edges, with vertical whitish and brownish water streaks running downward from several crack intersections. Include a horizontal construction joint or base line near the bottom of the wall, darker moisture staining along the lower section, and subtle moss or algae discoloration near the edges. The setting is an overcast riverside or drainage channel environment with sparse winter vegetation, rocks at the bottom right, and a narrow strip of still water on the right edge of the image. Natural muted lighting, neutral color palette, engineering inspection photo aesthetic, sharp surface texture, no people, no tools, no text, no annotations.