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Title:

Effect of Aggregate Composition on Moisture Sensitivity of Aggregate-Bitumen Bonds

Accession Number:

01550072

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The effects of aggregate mineralogical composition on moisture sensitivity of aggregate-bitumen bonds were investigated using four aggregate types (two limestone and two granite) and two bitumen types (40/60 pen and 70/100 pen). Moisture sensitivity of the aggregate-bitumen bonds were characterized using retained strength obtained from three different tensile tests - Peel, PATTI and Pull-off. The results showed significant differences in the amount of moisture absorbed by a given aggregate which suggested strong correlations between aggregate mineral composition and moisture absorption. For most of the aggregate-bitumen bonds, failure surfaces transformed from cohesive to adhesive with the conditioning time which support the strong influence of moisture on aggregate bonds. The three tensile tests used in this study showed similar ranking in terms of moisture sensitivity but the pull-off test was found to be the most sensitive. The effect of bitumen on moisture sensitivity was lower than the effect of aggregates. Moisture absorption properties of the aggregates depend strongly on certain key minerals including clay, anorthite and calcite. Strong correlations were also found between mineral compositions and moisture sensitivity with clay and anorthite having strong negative influence while calcite showed positive effect on moisture sensitivity. Previous studies have identified various mineral phases like albite, quartz, and k-feldspar, as detrimental in terms of moisture sensitivity. The results appear to support the extension of the existing list of detrimental aggregate minerals to include anorthite and clay while supporting the case of calcite as moisture resistant mineral.

Supplemental Notes:

This paper was sponsored by TRB committee AFK40 Characteristics of Asphalt-Aggregate Combinations to Meet Surface Requirements.

Monograph Accession #:

01550057

Report/Paper Numbers:

15-0999

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Zhang, Jizhe
Apeagyei, Alex K
Airey, Gordon D

Pagination:

18p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References

Uncontrolled Terms:

Moisture sensitivity

Subject Areas:

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

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-0999

Files:

TRIS, TRB, ATRI

Created Date:

Dec 30 2014 12:25PM