This document discusses maintenance works for civil engineering buildings. It defines various types of maintenance like planned, unplanned, preventative, and corrective maintenance. Preventative maintenance involves routine inspections and repairs to reduce the likelihood of failures. Corrective maintenance repairs items after failures occur. Regular maintenance is important to maintain building value, safety, and maximize the lifespan of building components. It also outlines the responsibilities, schedules, and factors that influence the effectiveness of different maintenance approaches.