Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue

Abstract

This paper aims to study the preparation and viscoelastic properties of asphalt binder modified by tetrahydrofuran soluble fraction (THFS) extracted from direct coal liquefaction residue. The modified asphalt binders, which blended with SK-90 (control asphalt binder) and 4%, 6%, 8% and 10% THFS (by weight of SK-90), were fabricated. The preparation process for asphalt binder was optimized in terms of the orthogonal array test strategy and gray correlation analysis results. The properties of asphalt binder were measured by applying Penetration performance grade and Superpave performance grade specifications. In addition, the temperature step and frequency sweep test in Dynamic Shear Rheometer were conducted to predict the rheological behavior, temperature and frequency susceptibility of asphalt binder. The test results suggested the optimal preparation process, such as 150 • C shearing temperature, 45 min shearing time and 4000 rpm shearing rate. Subsequently, the addition of THFS was beneficial in increasing the high-temperature properties but decreased the low-temperature properties and resistance to fatigue. The content analysis of THFS showed the percentage of 4~6% achieved a balance in the high-and-low temperature properties of asphalt binder. The asphalt binder with higher THFS content exhibited higher resistance to rutting and less sensitivity to frequency and temperature.

Evaluation of Compressive Strength of Asphalt Mixture from Marshall Stability and Indirect Tensile Strength

“…Among the various modifiers, polymer additives were found to be particularly effective because they demonstrate enhanced performance by increasing binder stiffness at elevated temperatures while preserving flexibility at low temperatures [9][10][11][12]. Polymer-modified asphalts exhibit enhanced resistance to thermal cracking and rutting, as well as reduced fatigue damage, temperature sensitivity, and stripping [13,14]. Furthermore, polymer additives exhibit increased creep resistance, making them suitable for prolonging the lifespan of surfaces at high-traffic intersections, bridge decks, and roundabouts.…”

Mechanistic-empirical evaluation of specific polymer-modified asphalt binders effect on the rheological performance

“…Among the different tested modifiers, polymer additives were found significantly functional due to their perceived superior performance, as they increase the stiffness of binders at high temperatures while upholding flexibility at lower temperatures. [10][11][12][13] Polymer-modified asphalts (PMAs) shows greater resistance to thermal cracking and rutting, as well as reduced fatigue damage, temperature susceptibility, and stripping. [14][15][16][17][18] PMAs are typically produced by mixing asphalt binder with 3% to 7% polymer additive by weight through mechanical dispersion under high shear.…”

Investigating the Dynamic Creep of Polymer Modified Hot Mix Asphalt

“…Various types of modifiers have been tested by researchers to mitigate the distress associated with the behavior of conventional asphalt binders [1][2][3][4]. Many researchers concluded that the asphalt binder modification increased the complex modulus of bitumen at high temperatures while reducing it at low temperatures [5][6][7][8][9]. Also, the bitumen modifier shows high resistance to thermal cracking, rutting, and…”