Category:Concrete
Close up View of Bush Hammered Concrete Column.jpg 5,184 × 3,456; 2.52 . A concrete railway pedestrian overbridge.jpg 1,728 × 3,072; 1.42 . A treatise on concrete, plain and reinforced - materials, construction, and design of concrete and reinforced concrete; 2nd ed. (1912) ().jpg 2,816 × 1,782; 525 KB.