Analysis on Splitting Strength of Warm Mix Asphalt Based on Theory of Surface Free Energy

Abstract

In this paper, splitting strength and freeze-thaw splitting strength of warm mix asphalt (WMA) are analyzed based on material surface free energy (SFE). Firstly, SFE, polar component and dispersion component of asphalt with different additives (Sasobit ® , anti-stripping agent) are measured through sessile drop method; Secondly, SFE and specific surface area (SSA) of limestone and granite are measured separately by capillary rise method and BET adsorption method; Fatherly, work of adhesion between asphalts and aggregates is calculated; At last, the author analyzes the relationships between SFE, each component, work of adhesion and splitting strength, freeze-thaw splitting strength of mixtures.The results show that: polar component of asphalt and splitting strength is negatively correlated, but dispersion component is positively correlated; and Sasobit ® makes dispersion component of asphalt reduce, but polar component increase, so splitting strength, freeze-thaw splitting strength of mixtures with Sasobit ® reduce legitimately; work of adhesion between asphalt and granite is larger than limestone, but the SSA of limestone is 1.4 times than granite, therefore, splitting strength, freeze-thaw splitting strength of mixtures with limestone are larger than granite; with the dosage of Sasobit ® increases, the work of adhesion, splitting strength and freeze-thaw splitting strength of mixtures are changed similarly.

Study on the Durability of Acid Rain Erosion-Resistant Asphalt Mixtures

“…In addition, the decrease of surface free energy of epoxy asphalt is the smallest under various acidic conditions, showing that it has excellent acid erosion resistance. According to existing research results [ 30 ], the surface free energy of asphalt binder directly affects the splitting strength and freeze–thaw splitting strength of the asphalt mixture, and further affects the moisture stability of the mixture. Therefore, the epoxy asphalt mixture has better moisture stability.…”