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.

• Periodical: Key Engineering Materials (Volume 509)
• Pages: 128-135
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.509.128
• Online since: April 2012
• Authors: Ji Qing Zhu, Shao Peng Wu, Jin Jun Zhong, Dong Ming Wang
• Keywords: Aggregate Substitution, Asphalt Mixture (AC), Blended Aggregate, Natural Aggregate, Recycled Aggregate (RA)

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