00667645

Component

http://onlinepubs.trb.org...trr/1994/1437/1437-007.pdf

https://scholar.google.co...czek&publication_year=1994

The characteristics of fine aggregate have a significant influence on the field performance of hot asphalt concrete mixtures. Siliceous and rounded particles, which make up a significant percentage of natural sand, are generally related to rutting and possibly stripping of asphalt mixtures. This study was conducted to develop and verify manual counting and automatic image analysis techniques to evaluate aggregate blends for amount of siliceous sand-size particles. Verification involved preparation of samples with known proportions of siliceous (translucent) and calcareous (opaque) particles. The samples prepared were analyzed manually with the aid of a microscope and automatically with an image analyzer. It was found that automatic image analysis can be used with a higher degree of confidence and accuracy than manual counting techniques in determining percent translucent particles. After the image analysis techniques were developed, extracted fine aggregates from field cores of various highway pavements in Indiana were examined with the image analyzer to determine amounts of translucent particles. The percentages of translucent sand particles, assumed to be natural sand, were evaluated for the effect on the gradation, and it was found that as the siliceous sand content on the field cores increased, humps on the 0.45 power gradation curve were likely to increase. Image analysis was found to be up to four times faster than manual counting techniques.

This paper appears in Transportation Research Record No. 1437, Aggregates: Waste and Recycled Materials; New Rapid Evaluation Technology. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01401247

English

p. 51-58

1994-9

Transportation Research Record

0309055156

Figures (5) ; References (7) ; Tables (4)

Accuracy; Aggregates; Chemical composition by material content; Core samples; Fine aggregates; Hot mix asphalt; Image analysis; Productivity; Rutting; Sand; Silica stone; Stripping (Pavements)

Aggregate analysis; Time savings

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

TRIS, TRB

Oct 11 1994 12:00AM

• ENGINEERING PROPERTIES OF SHREDDED TIRES IN LIGHTWEIGHT FILL APPLICATIONS
• EVALUATION OF FINE AGGREGATE ANGULARITY USING NATIONAL AGGREGATE ASSOCIATION FLOW TEST
• METHODOLOGY FOR IMPROVEMENT OF OXIDE RESIDUE MODELS FOR ESTIMATION OF AGGREGATE PERFORMANCE USING STOICHIOMETRIC ANALYSIS
• TOWARD AUTOMATING SIZE-GRADATION ANALYSIS OF MINERAL AGGREGATE
• USING RECOVERED GLASS AS CONSTRUCTION AGGREGATE FEEDSTOCK
• UTILIZATION OF PHOSPHOGYPSUM-BASED SLAG AGGREGATE IN PORTLAND CEMENT CONCRETE MIXTURES
• WASTE FOUNDRY SAND IN ASPHALT CONCRETE