Issue 43

M. Fakhri et alii, Frattura ed Integrità Strutturale, 43 (2018) 113-132; DOI: 10.3221/IGF-ESIS.43.09 116 Sieve Size (mm) Passing Percent 19 100 12.5 95 9 80 4.75 59 2.36 43 1.18 30 0.5 18 0.3 13 0.15 8 0.075 6 Table 1 : HMA Aggregate gradation. Test Unit Value Standard PG 64- 22 PG52- 28 Penetration mm/10 62 94 ASTM D5 Softening Point °C 49 42 ASTM D36 Ductility cm 120 130 ASTM D113 Specific Gravity g/cm 3 1.03 1.01 ASTM D70 Flash Point °C 308 294 ASTM D92 Loss on Heating % 0.08 0.07 ASTM D6 Viscosity at 120°C mm 2 /s 810 512 ASTM D2170 Viscosity at 135°C mm 2 /s 420 221 ASTM D2170 Viscosity in 150°C mm 2 /s 232 120 ASTM D2170 Solubility in TCE % 99.7 99.6 ASTM D2042 Penetration Index - -1.12 -1.98 Shell Bitumen Handbook Table 2 : Specification of bitumen used for manufacturing HMA mixtures. Specimen preparations The optimum percentage of bitumen was obtained by means of the Marshall Mix design method as presented in Tab. 3 for different aggregate types and binders. Aggregate type Bitumen type PG 64-22 PG52-28 Silica 5.2 % 5.0 % Lime 4.8 % 4.6 % Table 3 : Optimum percentage of bitumen for manufacturing the HMA mixtures of this research.