Effect of Aggregate Size on the Retention of Conventional and Rubberized Chip Seal
A common defect of chip seals is chip loss or raveling. The previous studies showed uniform grading of aggregate will enhance the retention ability of the chip seal. Also, it was shown that using crumb rubber as an aggregate will enhance the chip seal behavior including aggregate retention. However, no specific study has been done focusing on the effect of aggregate size for rubber nor natural aggregate. This paper is evaluating the effect of chip size on aggregate retention of both natural and rubber aggregate. Standard and modified Vialit tests, and standard and modified Pennsylvania tests which apply different forms of mechanical energy in different temperature was used to assess the aggregate-binder bond interaction and study the chip seal retention. Test results showed different trends for the effect of size on chip retention under impact load versus dynamic load because of different modes of failure. However, rubber particles showed a superior performance rather than natural aggregate in all cases.
A. Pourhassan et al., "Effect of Aggregate Size on the Retention of Conventional and Rubberized Chip Seal," Proceedings of the 20th Congress of IABSE (2019, New York City, NY), pp. 2090-2094, International Association for Bridge and Structural Engineering (IABSE), Sep 2019.
20th IABSE Congress, New York City 2019: The Evolving Metropolis (2019: Sep. 4-6, New York City, NY)
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Aggregate size; Chip loss; Chip seal; Pavement treatment; Raveling; Retention; Rubber; Rubberized chip seal; Seal coat
International Standard Book Number (ISBN)
Article - Conference proceedings
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01 Sep 2019