What are some instances when special inspection is required during concrete construction?

Special inspection during concrete construction is crucial to ensure that the work complies with project specifications and relevant codes. One of the key instances when special inspection is required is during replacement and placement inspections. This entails not only checking the quality and suitability of materials but also observing the actual placement of concrete to ensure that it is carried out in accordance with the approved methods. Inspectors assess the mix, placement procedures, and curing practices, which are vital for the structural integrity and performance of the concrete.

In contrast, decoration of the site does not impact structural safety or code compliance; therefore, it does not warrant special inspection. Similarly, only responding to issues is not proactive and could lead to major safety concerns if problems are allowed to develop unchecked. Finally, final approval inspections, while important, occur after construction is completed rather than during the critical phases of concrete placement and replacement, where the need for real-time inspection is paramount to ensure compliance during the actual work being performed.