rust on old wall backgroundcement floor that is not yet dry

activity backgroundcement backgrounds brown build builder built caucasian cement city concrete conduction connection construction contractor convection dry electrical electricity empty equipment finishing floor flooring ground growth home improvement indoor industrial industry installation installing interior landscape laying liquid machine man material mixture new nobody not old outdoor plaster plumber pour professional progress renovation repair repairman road room rust screed skill skin smooth solution space stage technology that tool trowel turning unfinished urban walkway wall warehouse wet work worker workman yet