Solar Energy Materials and Solar Cells, Vol.191, 175-182, 2019
Rheological performance investigation and sustainability evaluation of asphalt binder with thermochromic powders under solar radiation
Thermochromic asphalt binder is an innovative and promising road material in adjusting surface temperature of pavement. Instead, durability of this material under natural environment remains to be unknown. In this paper, weathering aging effects on rheological and chemical evolutions of thermochromic asphalt binder were evaluated by complex modulus (G*) master curve, crossover frequency (omega(c)), non-recoverable creep compliance (J(nr)), zero shear viscosity (ZSV), DSR Function value (DSRFn) and carbonyl and sulfoxide indexes. The results indicated that unlike blank sample, rheological indexes of thermochromic asphalt binder were not always increasing or decreasing with growth of weathering aging time, but there was a turning point during the weathering aging. Furthermore, the effects of weathering aging on rheological properties of thermochromic asphalt binder were much less than blank sample. Growth rates and amplitudes of carbonyl and sulfoxide indexes of thermochromic asphalt binder were also much lower than those of blank sample, which illustrates superior weathering aging resistance of thermochromic asphalt binder. In addition, weathering aging behaviors of thermochromic asphalt binder were dependent on combined effects of asphalt matrix and thermochromic powder.
Keywords:Thermochromic asphalt binder;Weathering aging behavior;Rheological properties;Fourier transform infrared spectroscopy