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Neue Methoden der Splint-, Kern- und Jahrring-Differenzierung von Hölzern—Erste Mitteilung:Die Zementrelief-Analyse

New methods of the differentiation of sapwood, heartwood and growthrings—Part I: The concrete-relief analysis

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Summary

Different procedures of the spawood, heartwood and growthring differentiation were developed, of which at first the concrete-relief-analysis is to be described. In this procedure, a concrete slop, applied to the cross section of a stem, in certain parts of the cross section, containing more or less strong setting inhibitors, does not harden and thus forms a matrix. These matrices are differing for the different woods. They often reproduce fine growth details, such as knots and growth rings and even rays. With stronger concrete intoxication, however, no structures, whatsoever, are reproduced. The latter often applies to the sapwood being richer in sugar, whereas the heartwood mostly shows static-free structures. Over the whole cross section Douglas fir reveals a uniformly sharp picture of the growth rings, showing projecting summerwood without marking of the heart. Pine, however, shows a projecting heart with sharp growth rings, but a less structural sap. The colored heart and the heart of the matrix cover each other. On the other hand, with fir the picture is with only little concrete abrasion characterized by merely hinted growth rings. In the case of beech without a red heart, because of the high portion of inhibiting elements, such a deep zone of inhibition is formed in the concrete, that the concrete-relief picture barely shows any structures. Beechwood with a red heart, however, produced a matrix with a plastic representation of the heart, in which not the growth rings are projecting, but the very fine rays. Birch showed the least concrete abrasion, though only hinted fine structures. With black locust, these were slightly better marked. Because of the occurence of strong inhibitors (sugar, tannins etc.) the cambium and bark zone is strongly deepened with nearly all woods. In this respect only the non-hygroscopic bark of birch constitutes an exception. Hence, the new method, on the basis of the structure of the inhibition-matrix, allows statements on the local distribution of inhibition materials in wood as well as on their quantitiy. Every wood species gives a typical concrete-relief picture, the appearence of which depends on the time of cutting. A part from this, the procedure permits, to examine the suitability of woods for concrete-bound wood base materials (woodwool-boards, wood-concrete hollow blocs etc.) as well as for mould-boards, particularly for visible concrete.

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Sandermann, W., Schmitz, G. Neue Methoden der Splint-, Kern- und Jahrring-Differenzierung von Hölzern—Erste Mitteilung:Die Zementrelief-Analyse . Holz als Roh-und Werkstoff 23, 221–227 (1965). https://doi.org/10.1007/BF02611074

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