Effect of Substitution of Recycled Aggregate by Natural Aggregate on Related Properties of Blended Aggregate and Asphalt Mixture

Abstract

The effect of substitution of recycled aggregate by natural aggregate on related properties of blended aggregate (without asphalt and mineral filler) and asphalt mixture was investigated in this paper. Demolition waste obtained from Wenchuan earthquake-damaged buildings was used as recycled aggregate in AC-25 asphalt mixture. The absorption, specific gravity and strength of both blended aggregate and asphalt mixture were tested. Results indicate that fine recycled aggregate is not suitable to be used in asphalt mixture because of its high absorption. The substitution of recycled aggregate by natural limestone aggregate can decrease the asphalt absorption and increase the effective specific gravity and indirect tensile strength of asphalt mixture. The quantitative relationship between related properties of blended aggregate and asphalt mixture was obtained. It was concluded that the substitution of recycled aggregate by natural aggregate is a feasible way to use recycled aggregate in asphalt mixture.

Mechanical performance of half-warm mix recycled asphalt mixtures containing total rates of reclaimed asphalt pavement for their use in road pavements

“…grade bitumen, the cracking and fracture properties have been found in other laboratory studies by other researchers (Botella et al, 2016;Nosetti et al, 2018) for a WMA/ HMWA mixture with a total RAP content (100%) and emulsified bitumen. Motter et al, 2015;Pasandín and Pérez, 2013;Pérez et al, 2007;Zhu et al, 2012) for T3 traffic load category (200>AADT≥50). The likely explanation for the decreased result lies in the fact that the overdose of bitumen content added into the mixture design, which reduces the internal friction/adhesion properties between aggregates and binder and hence decreases the stability values (Ruíz, 2001).…”