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Title: USING EPIFLUORESCENCE OPTICAL MICROSCOPY TO IDENTIFY CAUSES OF CONCRETE DISTRESS: CASE STUDY
Accession Number: 00932130
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: Materials-related distress (MRD) has affected many portland cement concrete pavements. Identifying the specific cause of MRD is not always possible, but with the use of appropriate techniques and a diagnostic approach, the cause can be determined in many cases. In a case studied as part of a Federal Highway Administration project titled Detection, Analysis, and Treatment of Materials-Related Distress in Concrete Pavements, apparent MRDs were identified. In one case study, determination of the effective water-to-cement ratio (w/c) by epifluorescence microscopy was the key to understanding the cause of distress. The effective w/c, which may not be exact for a given concrete on an absolute basis, was used to compare two concrete microstructures on a relative basis. Stereo-optical microscopy, petrographic optical microscopy, and scanning electron microscopy were also used to identify the MRD diagnostic features present in the distressed concrete. As a result of this analysis, evidence of paste freeze-thaw and deicer attack was identified, but the principal cause of the distress probably was a high w/c in the distressed concrete.
Supplemental Notes: This paper appears in Transportation Research Record No. 1798, Concrete 2002.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Sutter, L LPeterson, K RVan Dam, T JSmith, KPagination: p. 22-30
Publication Date: 2002
Serial: ISBN: 0309077230
Features: Figures
(10)
; Photos
(6)
; References
(11)
; Tables
(2)
TRT Terms: Uncontrolled Terms: Subject Areas: Highways; Materials; I32: Concrete
Files: TRIS, TRB, ATRI
Created Date: Oct 28 2002 12:00AM
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