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Performance of asphalt concrete is highly affected by strength of the adhesive bond between aggregate and asphalt binder. Adequate adhesion between asphalt binder and aggregate under both dry and wet conditions is desirable for maintaining the high performance and durability of asphalt pavements. Over the past decades, numerous research efforts have been devoted to the adhesion topics of asphalt mixtures, and valuable studies have provided feasible ways to measure the adhesive bond energy and strength of asphalt mixtures and utilize them as effective tools to evaluate the moisture susceptibility of asphalt mixtures. However, there is still a need to develop predictive models that quantify the combined effect of moisture and temperature on the adhesion properties of asphalt concrete. Such models can be then incorporated in pavement design programs and existing performance models to account for degradation of asphalt concrete under environmental conditions. To this end, this study develops a series of analytical models to predict the adhesive bond energy and adhesive bond damage induced at the aggregate-asphalt interface under any conditioning of the interest which is defined as the combination of relative humidity and temperature . The focus of this study is on the moisture in the vapor form under varying relative humidity differentials rather than the liquid water. A set of upfront Bituminous Bond Strength (BBS) tests is introduced to measure the fitting parameters of the models under two predefined conditionings, and a series of functions is formulated to predict these parameters under various conditionings from the measured values.

This paper was sponsored by TRB committee AKM40 Standing Committee on Asphalt Mixture Evaluation and Performance.

TRBAM-21-00411

English

16p

2021

Transportation Research Board 100th Annual Meeting

Digital/other

Figures; Photos; References

Adhesion; Aggregates; Asphalt concrete pavements; Bituminous binders; Bond strength (Materials); Energy; Moisture damage; Predictive models; Temperature

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-00411

TRIS, TRB, ATRI

Dec 23 2020 11:06AM