00616327

Component

http://onlinepubs.trb.org...trr/1991/1301/1301-014.pdf

https://scholar.google.co...bard&publication_year=1991

The physical characteristics of aggregates have an important influence on the behavior not only of unstabilized bases but also of asphalt concrete and portland cement concrete mixes. Experimental techniques using modern data acquisition methods for measuring and analyzing aggregate characteristics are described. A Pencept Penpad digitizer accurate to 0.0015 in. together with an IBM-XT microcomputer was used to collect and analyze the necessary data for measuring aggregate shape, surface area, and roughness. Measured coordinates of critical points were stored in an Autocad DXF file. The data were edited using a Basic program and then transferred to Lotus 1-2-3 with which they were analyzed and presented in the form of graphs, tables, and histograms. All data transfer and manipulation were performed electronically. Methods for shape and surface area measurement, classification, and interpretation were reviewed. Two different techniques for measurement of aggregate surface area were compared and demonstrated to yield reasonably similar results. A special shadow technique for studying the characteristics of particles smaller than the No. 8 sieve was described. In addition, the accuracy of the digitizer procedure for measuring surface roughness was assessed.

This paper appears in Transportation Research Record No. 1301, Factors Affecting Properties and Performance of Pavements and Bridges 1991. 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

01407099

p. 107-116

1991

Transportation Research Record

0309051053

Figures (4) ; Photos (1) ; References (13) ; Tables (2)

Accuracy; Aggregates; Aggregates by shape and surface texture; Analog to digital converters; Data analysis; Data collection; Information processing; Mathematical analysis; Microcomputers; Roughness; Spreadsheets; Surfaces

Aggregate shape; Surface area

Geotechnology; Highways; I36: Aggregates

TRIS, TRB, ATRI

Oct 31 1991 12:00AM

• CHLORIDE CONTENT OF PORTLAND CEMENT CONCRETE POWDER BY A METHOD USING FLOCCULATION
• COMPARISON OF FOUR AGGREGATES USING THE WASHINGTON HYDRAULIC FRACTURE TEST
• CRACKS IN LATEX-MODIFIED CONCRETE OVERLAYS--HOW THEY GET THERE, HOW SERIOUS THEY ARE, AND WHAT TO DO ABOUT THEM
• EFFECT OF FLY ASH ON ALKALI-SILICA REACTIVITY IN CONCRETE
• EFFECTS OF LOS ANGELES ABRASION TEST VALUES ON THE STRENGTHS OF LABORATORY-PREPARED MARSHALL SPECIMENS
• EVALUATION OF PARTICLE SHAPE AND TEXTURE: MANUFACTURED VERSUS NATURAL SANDS
• FLEXURAL CRACKING IN CONCRETE STRUCTURES
• LABORATORY EVALUATION OF THE ALKALI CARBONATE REACTION
• LABORATORY TESTS FOR PREDICTING COARSE AGGREGATE PERFORMANCE IN ONTARIO
• LATEX MODIFICATION EFFECTS ON THE IMPACT RESISTANCE AND TOUGHNESS OF PLAIN AND STEEL-FIBER-REINFORCED CONCRETES
• LATEX MODIFICATION EFFECTS ON THE MECHANISMS OF MICROCRACK PROPAGATION IN CONCRETE MATERIALS
• LIGNITE FLY ASH CONCRETE HIGHWAY PAVEMENT--A 15-YEAR PERFORMANCE HISTORY
• MICRO-DEVAL TEST FOR EVALUATING THE QUALITY OF FINE AGGREGATE FOR CONCRETE AND ASPHALT
• PHYSICAL CHARACTERISTICS OF POLISH RESISTANCE OF SELECTED AGGREGATES
• RAPID, ACCURATE METHOD FOR THE DETERMINATION OF SULFUR TRIOXIDE IN HYDRAULIC CEMENT
• RESTORING SKID RESISTANCE TO CONCRETE PAVEMENTS AND BRIDGE DECKS USING A LATEX-MODIFIED PORTLAND CEMENT SLAG SLURRY
• ROLLER-COMPACTED CONCRETE SLABS USING PHOSPHOGYPSUM
• SILICA FUME, LATEX-MODIFIED PORTLAND CEMENT MORTARS AND CONCRETES
• USE OF HIGH-VOLUME CLASS F FLY ASH FOR STRUCTURAL-GRADE CONCRETE
• VISUALIZATION OF CHLORIDE DISTRIBUTION IN CONCRETE (ABRIDGMENT)