What is the purpose of the control strip?

• A. Determine binder content
• B. Highest density achievable on the project
• C. Measure surface roughness
• D. Determine asphalt temperature

Answer: (B)

Setting the target density for compaction is the purpose of a control strip. A control strip is laid and compacted on the project under the same conditions as the rest of the pavement, with the aim of achieving the maximum density the mix can reach with the equipment and conditions used. The density measured on this strip becomes the reference or target for evaluating all subsequent in-place density tests. By comparing field densities to this target, you can determine whether the mat is adequately compacted and whether adjustments to compaction effort or paving procedures are needed. It isn’t used to determine binder content, surface roughness, or asphalt temperature, which are assessed by other tests or measurements.