Laboratory and Full-Scale Field Evaluation of Asphalt Materials Containing GEODOB 2TA

Warm-mix asphalt additives require evaluation from laboratory characterization to full-scale construction. This study evaluates the laboratory-to-field applicability of GEODOB 2TA in asphalt pavement construction. Untreated and modified BND 70/100 binders were compared using conventional tests, while coarse- and fine-grained asphalt mixtures for the lower and upper pavement layers were evaluated against specification requirements. The assessment also included documented full-scale implementation and post-construction field-core verification. The modified binder satisfied all evaluated requirements. The lower-layer mixture met most requirements, although residual porosity was 1.7% compared with the specified 2.5–5.0%. The upper-layer mixture showed deviations in the internal friction coefficient (0.82 versus ≥0.83) and crack resistance at 0 °C (3.3 MPa versus 3.5–6.5 MPa). During full-scale implementation of the lower-layer mixture, plant discharge was recorded at 120 °C, with paving temperatures decreasing to approximately 90 °C. The lower-layer core collected within the trial section had water saturation of 1.1%, while an upper-layer core collected outside the section had water saturation of 2.5%. Both sampled locations met the specified minimum compaction coefficient of 0.99. The findings document production and placement under the investigated conditions and satisfactory compaction at the sampled locations. However, the identified laboratory nonconformities preclude a conclusion of full mixture compliance, and the study does not establish long-term performance or quantify temperature reductions or energy savings attributable to the additive. The reported value of approximately 0.67% represents only a nominal field-derived ratio calculated from 200 L of additive and the nominal 30 m3 tank capacity, rather than a verified additive concentration or an optimized dosage recommendation. Dosage optimization and the uniformity of additive distribution were not evaluated.