There is not a predictable value or “rule-of-thumb NUMBER” for the difference in air void content of original and reheated samples. The GENERAL trend WOULD be for the reheated samples to have HIGHER air voids than the original, compacted specimens. Absorption and hardening or stiffening of the asphalt binder in the reheated samples likely causes this difference. Reheated samples can be utilized to give an overall check of the original sample results. Before any significant precision is ATTRIBUTED to reheated sample results, a correlation should be developed for reheated sample air voids and original sample air voids by performing a series of comparative tests.

There is not a predictable value or “rule-of-thumb number” for the difference in air void content of original and reheated samples. The general trend would be for the reheated samples to have higher air voids than the original, compacted specimens. Absorption and hardening or stiffening of the asphalt binder in the reheated samples likely causes this difference. Reheated samples can be utilized to give an overall check of the original sample results. Before any significant precision is attributed to reheated sample results, a correlation should be developed for reheated sample air voids and original sample air voids by performing a series of comparative tests.