Which document must be updated daily by the contractor for concrete quality control?

The document that must be updated daily by the contractor for concrete quality control is the Control Charts for Air and Slump. This is vital because control charts are used to monitor and maintain the consistency and quality of concrete during the mixing and pouring processes. Regular updates to these charts allow for immediate adjustments based on actual measurements of air content and slump, which are critical indicators of concrete workability and strength.

Maintaining accurate and up-to-date control charts ensures that any deviations from specified concrete properties can be promptly addressed. This proactive approach helps prevent potential issues, ensuring the concrete meets the required standards and is suitable for its intended use, thus enhancing the overall quality and safety of the construction project.