Thermal oxidative aging mechanism of crumb rubber/SBS composite modified asphalt

Short-Term Aging Effect on Properties of Sustainable Pavement Asphalts Modified by Waste Rubber and Diatomite

“…The reasons is that diatomite particles can effectively adsorb the small molecular groups and low polar aromatic molecules of asphalt, which inhibits the aging reaction significantly [27]. The crumb rubber would be degraded in the high temperature blending process, and the degradation product distributed as resins and asphaltenes in asphalt [21]. The compound modified asphalt could combine the advantages of diatomite and crumb rubber, and achieve better modification effects.…”

“…Volatilization of small molecule components in asphalt and chemical reaction between aromatics and oxygen are the main reasons leading to the aging of asphalt. Generally, in the asphalt aging process, saturations are relatively stable and change little; aromatics are more prone to turn into resins with oxidative polymerization reaction; resins containing polar functional groups are prone to turn into asphaltenes with aggregation and condensation reaction [21]. The asphalt components generally transform into the heavy direction of aromatics-resins-asphaltenes.…”

“…The results shown in Figure 8 reveal that creep stiffness (S) of asphalt binders linearly increases while the m-value linearly decreases with increasing time. This is because the light component in asphalt transforms into a heavy component, which make the asphalt become harder [20,21]. Thus On the contrary, the elastic recovery property is distinct for the crumb rubber modifying process because of the swelling reaction and degradation action.…”

“…The results shown in Figure 8 reveal that creep stiffness (S) of asphalt binders linearly increases while the m-value linearly decreases with increasing time. This is because the light component in asphalt transforms into a heavy component, which make the asphalt become harder [20,21] The results shown in Figure 8 reveal that creep stiffness (S) of asphalt binders linearly increases while the m-value linearly decreases with increasing time. This is because the light component in asphalt transforms into a heavy component, which make the asphalt become harder [20,21].…”

“…asphalt [21]. The compound modified asphalt could combine the advantages of diatomite and crumb rubber, and achieve better modification effects.…”