01363923

Component

https://doi.org/10.3141/2267-06

http://scholar.google.com...sain&publication_year=2012

Chip seal is a widely used preventive maintenance treatment for flexible pavements. However, a major problem with chip seal is the damage caused by loose aggregates from newly placed seals, partly because of a lack of compatibility between aggregate and asphalt emulsion. In this study, limestone, crushed gravel, synthetic lightweight aggregates, and recycled asphalt pavement materials were studied in the laboratory with two polymer-modified asphalt emulsions to find the aggregate–emulsion combination that would result in maximum chip retention. Replicate specimens were tested in the ASTM D7000 sweep test for each aggregate–emulsion combination. Lightweight aggregates and gravel were also tested in a newly developed test setup for simulating the sweep test. Test results show that lightweight aggregates perform better than gravel. However, lightweight aggregate sources play an important role in chip retention. Emulsion is the most significant factor that affects chip loss. Statistical analysis identified the influential design factors affecting chip retention. Analysis of variance shows that aggregate and emulsion types and aggregate–emulsion interaction are significant factors affecting chip retention. Aggregate precoating and its interaction with emulsion type are insignificant factors as far as chip retention is concerned.

This paper was sponsored by TRB committee AFP70 Mineral Aggregates

01379841

12-3680

English

pp 56-64

2012

Transportation Research Record: Journal of the Transportation Research Board

9780309223096

Print

Figures; Photos; References; Tables

Aggregates; Asphalt emulsions; Chip seals; Flexible pavements; Performance tests; Statistical analysis; Surface treating

Aggregate retention

Geotechnology; Highways; Materials; Pavements; I31: Bituminous Binders and Materials; I36: Aggregates

PRP, TRIS, TRB, ATRI

Feb 8 2012 5:18PM

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