generic modern concrete texture (actually from a KHRAS station in copenhagen).
link to full size image, 2000x2000 pixels.
sharing my homemade architectural hi-res textures - for those of you who work in 3D or photoshop. they are originally made for renderings in 3D max and tile seamlessly.
uploaded with a CC license. no attribution necessary.
the full set of architectural textures that tile seamlessly here. 