How many core samples are required to be taken from each mix type and lot placed on a given day?

The requirement to take at least three core samples for each mix type and lot placed on a given day is based on quality assurance practices in roadway construction. Taking multiple samples allows for a more accurate representation of the material properties and the consistency of the installation.

By collecting three core samples, it ensures a reliable average can be calculated, which helps in determining whether the placed material meets specified performance criteria. This method also accounts for variability that may occur in material quality or installation techniques, thereby enhancing the reliability of the data collected for quality control.

In cases where only one or two samples are taken, any variability or anomalies might not be identified, leading to potential issues in the final quality of the roadway. Therefore, the requirement of a minimum of three samples strikes a balance between practicality and the need for thoroughness in maintaining quality standards.