Issue 51

P. Farazmand et alii, Frattura ed Integrità Strutturale, 51 (2021) 215-224; DOI: 10.3221/IGF-ESIS.51.17 217 Test results Allowable limits of the Code No. 234 Test standard Description Top coat Binder 22.3 30 40 AASHTO T96 Maximum abrasion by Los Angeles abrasion test (%) 16 25 30 BS 812 Maximum flakiness index (%) 93 90 80 ASTM D5821 Minimum percent of particles with two fractured faces for sieve No. 4 (%) 2.2 2.5 2.5 AASHTO T85 Maximum percent of water absorption (coarse- grained aggregate) 2.4 2.5 2.8 AASHTO T84 Maximum percent of water absorption (fine-grained aggregate) 2.59 - - ASTM C127 True specific gravity of coarse-grained aggregate 2.32 - - ASTM C128 True specific gravity of fine-grained aggregate Table 2: Specifications of aggregate Figure 1 : Particle size distribution for stone mastic asphalt mixture. Applied content Abbrev. name Modifier Mix design No 0 AC - Control 1 0.1% of bitumen in weight [11] Za ZycoTherm Modified by ZycoTherm 2 4% of bitumen in weight [12] Nc Nanoclay Modified by nanoclay 3 4.5% of bitumen in weight [13] SB SBS Modified by SBS 4 4% of bitumen in weight [14] NS Nanosilica Modified by nanosilica 5 Table 3: Name of specimens and percent of each material for optimum bitumen content. E XPERIMENTAL TEST Initial tests n this study, the Marshall stability test is done according to the ASTM D-1559, the modulus of resilience test is done according to the ASTM D-4123, the moisture susceptibility of mixture is measured based on indirect tensile strength test according to the AASHTO T283 and the boiling water test is done according to the ASTM D-3625 [15] [16] [17]. I