Under what condition may the Engineer approve production of a different mix design without requiring limited production?

The Engineer may approve the production of a different mix design without requiring limited production if the cause is related to mix problems. This scenario typically arises when the current mix design is not performing as intended, whether due to issues such as improper materials, incorrect ratios, or performance failures in practical applications.

In such instances, the flexibility to change the mix design allows for a quick and effective response to ensure that the project remains on schedule and meets the required specifications. It is crucial for maintaining quality and safety standards in roadway construction. Addressing mix problems right away reinforces the integrity of the project and helps to mitigate potential delays or complications that could arise from using an unsuitable mix.

Other scenarios, like governmental requirements or concerns about cost savings, may not justify changes to the mix design without further evaluation or conditions to ensure compliance with project standards. Weather conditions may also affect the application of a particular mix but are not typically a direct cause for altering a design without review.