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原文传递 USING EPIFLUORESCENCE OPTICAL MICROSCOPY TO IDENTIFY CAUSES OF CONCRETE DISTRESS: CASE STUDY.

题名：	USING EPIFLUORESCENCE OPTICAL MICROSCOPY TO IDENTIFY CAUSES OF CONCRETE DISTRESS: CASE STUDY.
作者：	Sutter-LL; Peterson-KR; Van-Dam-TJ; Smith-K
关键词：	Case-studies; Concrete-pavements; Diagnostic-tests; Epifluorescence-optical-microscopy; Materials-related-distress; Microstructure-; Pavement-distress; Petrographic-optical-microscopy; Portland-cement-concrete; Scanning-electron-microscopy; Stereo-optical-microscopy; Water-cement-ratio
摘要：	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.
总页数：	Transportation Research Record. 2002. (1798) pp22-30 (6 Phot., 10 Fig., 2 Tab., 11 Ref.)
报告类型：	科技报告