Investigation of the Black Rock Issue for Recycled Asphalt Mixtures
As part of the NCHRP 9-12 research, Incorporation of Reclaimed Asphalt Pavement in the Superpave system, a study was carried out to investigate whether Reclaimed Asphalt Pavement (RAP) acts like a black rock when added to hot mix asphalt mixtures. Three RAPS with different stiffness, two new binders, and two RAP ratios were used. For mixtures with 10% RAP, there was no significant difference between the three mixture cases but for 40% RAP ratio, the standard practice mixtures were closer to the total blending than the black rock. Statistical analysis verified this observation for most studied cases. Only 18.8% of studied cases proposed that RAP is a black rock but 50% of studied cases showed that there was no difference between the cases at low RAP content. This was in agreement with the Expert Task Group suggestion that 10% RAP will not significantly affect the asphalt mixture containing RAP.
H. R. Soleymani et al., "Investigation of the Black Rock Issue for Recycled Asphalt Mixtures," Proceedings of the Association of Asphalt Paving Technologists Annual Meeting (2000, Reno, NV), vol. 69, pp. 366-390, Association of Asphalt Paving Technologists (AAPT), Mar 2000.
2000 Annual Meeting of the Association of Asphalt Paving Technologists (2000: Mar. 13-15, Reno, NV)
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Asphalt Mixture; Black Rock; Blending Chart; Recycling; Superpave
International Standard Serial Number (ISSN)
Article - Conference proceedings
© 2000 Association of Asphalt Paving Technologists (AAPT), All rights reserved.
01 Mar 2000