What is the pay factor for Air voids?

The pay factor for air voids in asphalt pavement is indeed a critical component of quality control in paving projects. In general, a pay factor represents the percentage of the contract price that is paid to the contractor based on the quality of the work performed.

For air voids specifically, the 25% figure reflects the importance of controlling the air voids in the final asphalt mix, as it directly impacts the density, durability, and performance of the pavement. Air voids are necessary to accommodate changes in temperature and to reduce the risk of moisture damage; however, too many voids can lead to premature failures due to insufficient bonding between aggregate particles.

The correct percentage influences how adjustments to the air void levels in a mix design can lead to either bonus or penalty payments depending on whether the quantity falls within specified limits. Maintaining a design air void content ensures the asphalt mix performs as intended over the long term.

The other percentages listed would not accurately align with the standard practices established for air void management in asphalt pavement. These standards are developed from years of practical experience and research, making the 25% value both a guideline and a critical factor in the evaluation of asphalt pavement quality.