00676687

Component

http://onlinepubs.trb.org...trr/1994/1458/1458-004.pdf

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

The major objective of this study was to evaluate the potential of image analysis for characterizing air voids in portland cement concrete (PCC), voids and constituents of asphalt concrete (AC), and aggregate gradation in AC. Images for analysis were obtained from a scanning electron microscope (SEM). Sample preparation techniques are presented that enhance signal differences so that backscattered electron (BSE) imaging, which is sensitive to atomic number changes, can be effectively employed. Work with PCC and AC pavement core samples has demonstrated that the low vacuum scanning electron microscope is better suited to doing rapid analyses. The conventional high vacuum SEM can be used for AC and PCC analyses, but some distortion within the sample matrix will occur. Images with improved resolution can be obtained from SEM BSE micrographs. In a BSE image, voids filled with barium sulfate/resin yield excellent contrast in both PCC and AC. There is a good correlation between percent of air by image analysis and linear traverse.

This paper appears in Transportation Research Record No. 1458, Concrete Research. 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

01401262

English

Mather, Bryant

p. 20-27

1994

Transportation Research Record

0309060656

Figures (7) ; Photos (3) ; References (14) ; Tables (1)

Aggregate gradation; Air voids; Asphalt concrete; Electron microscopes; Image analysis; Image processing; Portland cement concrete; Samples

Backscattered electron imaging; Preparation; Scanning electron microscopes

Highways; Materials; I31: Bituminous Binders and Materials; I32: Concrete

TRIS, TRB

Apr 28 1995 12:00AM

• ADDITION OF CLASS C FLY ASH TO CONTROL EXPANSIONS DUE TO ALKALI-SILICA REACTION
• DEVELOPMENT OF CONCRETE DURABILITY SPECIFICATION AND RATINGS IN FLORIDA
• EFFECT OF CURING ON DURABILITY OF FLY ASH CONCRETE
• EFFECT OF NATURAL POZZOLAN ADDITION ON EXPANSIONS CAUSED BY ALKALI-SILICA REACTION
• EVALUATION AND COMPARISON OF THE PHYSICAL PROPERTIES OF FIBRILLATED POLYPROPYLENE FIBER-REINFORCED CONCRETES
• INFLUENCE OF EARLY HEAT CURING ON PROPERTIES OF 100-MPA AIR-ENTRAINED CONCRETE
• INFLUENCE OF LOADING TYPE, SPECIMEN SIZE, AND FIBER CONTENT ON FLEXURAL TOUGHNESS OF FIBER-REINFORCED CONCRETE
• INTERPRETATION OF ACCELERATED TEST METHOD ASTM P214 TEST RESULTS
• MECHANICAL PROPERTIES OF LIGHTWEIGHT CONCRETE INCORPORATING RECYCLED SYNTHETIC WASTES
• NONDESTRUCTIVE IDENTIFICATION OF INTERNALLY DAMAGED AREAS OF CONCRETE BEAM USING THE SPECTRAL ANALYSIS OF SURFACE WAVES METHOD
• OPTIMIZATION OF ROLLER-COMPACTED CONCRETE FOR LOCAL APPLICATION
• PERFORMANCE CHARACTERISTICS OF MONOFILAMENT POLYPROPYLENE FIBER-REINFORCED CONCRETE
• PREDICTION OF CREEP EFFECT IN SEGMENTAL CONCRETE BRIDGE CONSTRUCTION
• RECYCLING CONTAMINATED SPENT BLASTING ABRASIVES IN PORTLAND CEMENT MORTARS
• STABILIZATION AND SOLIDIFICATION OF CONTAMINATED SOILS AND SLUDGES USING CEMENTITIOUS SYSTEMS: SELECTED CASE HISTORIES
• SYSTEM OPTIMIZATION OF FAILURE, CONSTITUTIVE MODELING, AND STRENGTHS OF CONCRETE AND OTHER GEOLOGICAL MATERIALS USING GENETIC ALGORITHM
• USE OF MATURITY AND PULSE VELOCITY TECHNIQUES TO PREDICT STRENGTH GAIN OF RAPID CONCRETE PAVEMENT REPAIRS DURING CURING PERIOD