The low-temperature performance properties of asphalt mortar modified by an aluminate coupling agent (ACA) were investigated and are reported in this paper. An orthogonal experiment design method was used, and the creep stiffness and m-value were adopted as the indicators to investigate the modifier effects of the filler-asphalt ratio, ACA, and stearic acid on the low-temperature performance of asphalt mortar. The influence of other factors on the high-temperature, anti-rutting performance and intermediate-temperature fatigue performance of asphalt mortar was also evaluated. Analysis indicated that ACA could improve significantly the low-temperature performance and intermediate-temperature fatigue performance of asphalt mortar but reduced the high-temperature performance. Asphalt mortar modified by a moderate filler-asphalt ratio, a significant amount of ACA, and stearic acid showed better low-temperature performance properties.
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