Petrographic method used in the study of leaching of cement paste in concrete
Review articleOpen access

AbstractThe article deals with a special example of petrographic methods applied to the study of durability of concrete. The problem was to examine the distribution of symptoms of leaching of cement paste around water-bearing cracks in concrete. For this purpose nine thin-sections of large size (about 15 cm2) were prepared from core samples; some of the thin-sections were cut parallel to, others at right angles to the fracture. In each thin-section the content of Ca(OH)2 in the cement paste was measured in a number of points by means of a micrometer eye piece; for thin-sections cut parallel to the cracks the measuring points were randomly selected; for those cut at right angles to a crack the points were placed in a series of lines running parallel to the crack at varying distances from it. From the data obtained it was possible to locate the symptoms of leaching very closely. As a result it was found that the leaching has only influenced a rather narrow zone around the cracks.

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