Samples for strength testing of each class of concrete must be taken no less than one per how many square feet of slab placed?

Strength testing of concrete is a crucial component in ensuring the structural integrity and reliability of construction projects. In North Carolina, the standard practice stipulates that samples must be taken at a frequency of no less than one per 100 square feet of slab placed. This measurement is designed to ensure that there is adequate representation of the concrete’s strength over the area being poured.

The rationale behind this requirement is to monitor the quality of the concrete consistently throughout the construction process. By taking samples from this designated area, contractors can analyze the concrete’s performance characteristics and ensure that it meets the specified design strength, which is vital for safety and durability.

Ensuring that samples are taken at this frequency helps detect any potential issues early, which could arise from variations in the mixing, pouring, or curing processes. This attention to detail supports maintaining construction standards and public safety in building projects.