Effect of the Amount of Mineral Powder on the Ultraviolet Aging Properties of Asphalt

Abstract

Mortar has an important influence on the viscosity and durability of a mixture. The effects of the amount of mineral powder in asphalt mortar on the ultraviolet (UV) aging properties of asphalt were investigated by a Fourier transform infrared spectrum (FTIR), gel permeation chromatography (GPC), and dynamic shear rheometer (DSR). The FTIR results show that the UV-resistant aging ability of asphalt mortar was superior to asphalt and that the carbonyl indices of the SBS- (styrene-butadiene-styrene-) asphalt mortar and matrix asphalt mortar were more significant. The GPC results show that the molecular weight distribution coefficient (Mw/Mn) of the SBS-asphalt-filler mastic is 1.0 and that of the matrix asphalt-filler mastic is 1.2, which is the largest. The macro-property is the most stable. The DSR results show that the matrix asphalt-filler mastic ranging from 1.0 to 1.2 and the SBS-modified asphalt-filler mastic ranging from 0.8 to 1.0 show the best UV aging resistance. Therefore, the effects of the amount of mineral powder cannot be ignored, suggesting that the best mass ratio of the matrix asphalt mortar is 1.2 and that of the SBS-modified asphalt mortar is 1.0 during the UV aging process.

Influence of the Mineral Powder Content on the Asphalt Aging Resistance in High-Altitude Areas Based on Indoor Ultraviolet Light Tests

“…According to the relevant research results [14,27,29,40], the mass ratios of the mineral powder, or filler, to the base asphalt (F/A) or SBS modified asphalt as were selected as 0, 0.8, 1.0, 1.2, 1.4, and 1.6. The preparation process of asphalt mortar is shown in Figure 2.…”

“…After all of the samples using the thin film oven test (TFOT) according to the China test specification JTG E20-2011 [41], they were allowed to cool to room temperature and placed in the UV environmental oven. According to the relevant research results [14,27,29,40], the mass ratios of the mineral powder, or filler, to the base asphalt (F/A) or SBS modified asphalt as were selected as 0, 0.8, 1.0, 1.2, 1.4, and 1.6. The preparation process of asphalt mortar is shown in Figure 2.…”

“…Xiangbing Xie [14] High pressure mercury lamp (UV) 200 W/m 2 35 • C Liping Liu [15] High pressure mercury lamp (Reflection type black) 3.4 × 10 4 µW/m 2 40 • C Y.T. Wu [16] High pressure mercury lamp (Reflection type black) 400 W/m 2 50 • C Zhaoyi He [17] High pressure mercury lamp (UV) 40 W/m 2 70 • C He Xie [18] Fluorescent UV lamps 0.89 W/m 2 ·nm 45 • C Mouillet Virginie [19] Fluorescent UV lamps 0.72 W/m 2 /nm 45 • C Wenbo Zeng [20] High pressure mercury lamp (UV) 500 µW/m 2 30 • C 50 • C 70 • C From the perspective of composite materials, an asphalt mixture is composed of an asphalt mortar with viscoelastic properties and aggregates that form the skeletal structure [2].…”

“…Huang Shinche combined different modelling techniques to investigate the effect of fillers on the long-term aging characteristics of asphalt binders and found that a generalized power law model could be used to characterize the asphalt binders, in which the stiffness effect of asphalt filler was reduced with aging [30]. However, Xie investigated the anti-ultraviolet aging mechanism of asphalt mortar from the perspective of physical chemistry by infrared spectroscopy and found that the degree of degradation of the SBS modifier increased from slight to severe with increasing amounts of mineral powder [14]. Additionally, some work has been done to examine the role of fillers in the aging process of asphalt mortar.…”

“…The result showed that, with the addition of the filler, the index of butadiene double bonds and the values of peak broadening of the modifier phase firstly increased and then decreased. This might be explained as follows: with an increasing amount of mineral powder, the oil content in the bitumen begins to decrease, to reduce the swelling effect of the SBS modifier and to lead the SBS modifier to increase the degree of degradation in the UV radiations [14].…”