In order to analyze the influence of aggregate properties on the performance of chip-seal at relative low-temperatures, the interface bond test (IBT) and the Vialit test were utilized to investigate the interface bond strength and the adhesive performance (between asphalt and aggregates), respectively. The Vialit tests were conducted at -10, -22, and -26°C for emulsified asphalt (1.90 L/m² (0.42 gal/yd²) CRS-2P used in this study) and several types of aggregates. In particular, the IBT focused on the interface bond strength between the chip-seal and the pavement. The laboratory IBT samples were prepared using the same CRS-2P application rate of 1.63 L/m² (0.36 Gal/yd²). The average percent embedment (PE) of aggregates into the asphalt of the IBT samples was also measured to ensure that all of the samples met the design requirements. Both tests revealed that the mineral compositions and size range have direct and significant control over the performance of the chip-seals. In order to quantify the correlations between the chip-seal performance and the aggregate properties, the grey-correlation approach was used in the quantified influence analysis of aggregate properties. The results indicated that PE has the highest impact on the interface bond strength of the chip-seal. Besides, compared with the aggregate size, the mineral compositions of the aggregate have a more significant impact on the performance of chip-seals, which includes adhesion and interface bond strength. Therefore, in the case of ensuring sufficient PE in the field chip-seal applications, the mineral compositions of the aggregates should be considered.

Correlation Analysis;Asphalt Film Thickness;Bonding Performance;Chip Seal