Issue 43

M. Fakhri et alii, Frattura ed Integrità Strutturale, 43 (2018) 113-132; DOI: 10.3221/IGF-ESIS.43.09 122 AC in regions with mild climate, shows the most resistance against fracture, comparing to cold and warm climates (with the mean annual temperature value of 5 and 25°C, respectively). Figure 9 : The effect of temperature on fracture energy at 5°C under pure mode I loading condition. Figure 10 : The effect of aggregate type on fracture energy at 5°C under pure mode II loading condition. The effect of aggregate type on fracture energy under pure mode II loading condition Fig. 10 shows that increasing loading rates, results in improving fracture energy of both asphalt mixtures fabricated with lime and silica aggregates under pure mode II loading condition at 5°C. Generally, asphalt mixtures fabricated with lime aggregate show more resistance against fracture comparing to those built with silica aggregate. According to test results shown in Fig. 11 there is not any specific advantage in fracture resistance for asphalt mixtures manufactured with silica or lime aggregate at 25°C, since AC behaves in viscoelastic manner and the crack tends to circle aggregates by passing mastic phase. Furthermore under low and high loading rates (i.e. 1 and 50 mm/min), asphalt mixtures built with lime show more fracture resistance than those manufactured with silica.