Concrete and plaster are the two surfaces that show most in facade and interior shots, and the ones that give a render away fastest: a texture at the wrong scale makes a wall look like a scale model. Here are ten 2K textures, each with colour, roughness and normal maps and a ready Blender material.
Each texture’s page states the area it covers, such as 3 m × 3 m. In Blender set the Scale of the Mapping node so one metre of the scene is one metre of the image; in 3ds Max use a UVW Map of type Box with the same size. That alone fixes most concrete scenes that look fake.
All files are free for personal and commercial use. Details in the terms of use; more textures in the textures section.