Which of the following is NOT a component of material approvals?

Material approvals in construction typically involve the assessment and validation of specific materials to ensure they meet the project specifications and standards. This process is critical for maintaining quality and safety on construction sites, particularly in highway construction.

The process of material approvals generally includes several key components. Material submittals are formal requests submitted by contractors to present the materials they intend to use, along with details such as manufacturer data and compliance certificates. Certifications verify that materials comply with relevant standards and regulations, providing assurance about their quality and suitability for the intended use. Test results are important as they demonstrate that the materials have undergone the necessary evaluations and meet the performance criteria outlined in project specifications.

Project timelines, while essential to the overall management of a construction project, are not directly tied to the approval of materials themselves. They primarily concern the scheduling and sequencing of construction activities, rather than the specific quality and compliance checks that define the material approval process. Therefore, the correct answer reveals that project timelines do not form a component of material approvals, contrasting with the other options which directly relate to the assessment and validation of materials.