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Title:

Comparison of Shape Parameters for Different Types and Sizes of Coarse Aggregates for Pavement Applications

Accession Number:

01373748

Record Type:

Component

Abstract:

The performance of pavements can be significantly influenced by the gradation and shape parameters of the aggregates (i.e., angularity, texture, form, and sphericity). An accurate measurement of these properties is important for developing specifications for quality control and quality assurance of aggregates. The present study was undertaken to compare shape parameters of different types and sizes of coarse aggregates. Three different types of aggregates: granite, rhyolite, and limestone were collected from the stockpiles. Each type of aggregate was divided into three different sizes of coarse aggregates: coarse aggregate (CA)1, CA2, and CA3, with CA1 being the largest, followed by CA2 and CA3. An automated aggregate imaging system (AIMS) was used to measure the shape parameters of the aggregates. Results show that the aggregates become smooth (low texture) and elongated (high form and low sphericity) as their size decreases. No relation was observed between the particle size and angularity of the aggregates. A comparison of different types of aggregates indicates that, in general, granite aggregates were highly rough (high texture) and cubical (low form and high sphericity) compared to rhyolite and limestone aggregates. Similarly, the angularity of granite aggregates was found to be significantly different than rhyolite and limestone aggregates. The ranking of the aggregates was done based on the composite shape index factor (CI). CI considers the combined effect of gradation and shape parameters of aggregates. Overall, granite aggregate was ranked first, followed by rhyolite and limestone aggregates.

Supplemental Notes:

This paper was sponsored by TRB committee AFP70 Mineral Aggregates

Monograph Accession #:

01362476

Report/Paper Numbers:

12-0758

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Singh, Dharamveer
Zaman, Musharraf
Commuri, Sesh

Pagination:

19p

Publication Date:

2012

Conference:

Transportation Research Board 91st Annual Meeting

Location: Washington DC, United States
Date: 2012-1-22 to 2012-1-26
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Subject Areas:

Highways; Materials; Pavements; I36: Aggregates

Source Data:

Transportation Research Board Annual Meeting 2012 Paper #12-0758

Files:

TRIS, TRB

Created Date:

Feb 8 2012 4:57PM