What must a contractor do if they elect to produce a different mix design of the same mix type?

When a contractor decides to produce a different mix design of the same mix type, it is essential to conduct a limited production procedure. This step is crucial because it allows the contractor to verify that the new mix design meets the necessary specifications and performance criteria before full-scale production begins.

The limited production procedure typically involves producing a small batch of the new mix design and testing it to ensure it performs as expected under the given conditions. This approach helps to identify any potential issues early on and mitigates the risk of using subpar materials or processes that could compromise the quality of the roadway. By following this protocol, the contractor demonstrates diligence and responsibility in ensuring that the final product will adhere to quality standards.

In contrast, immediately beginning production without the limited procedure may lead to problems down the line, such as failure to meet project specifications. Requesting approval from the Engineer might be part of the process but does not inherently cover the necessary actions to ensure the mix is appropriate. Changing the job mix formula entirely might be excessive if the mix type is already established and only requires modification within certain parameters.