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Orientierende Untersuchungen zum Verhalten des Splint- und Kernholzes der Pappel bei der Zementbindung

 
: Dix, B.; Roffael, E.

Holz als Roh- und Werkstoff 49 (1991), No.10, pp.373-376
ISSN: 0018-3768
German
Journal Article
Fraunhofer WKI ()
cement composite; heartwood; Kernholz; Pappel; poplar; sapwood; Splintholz; Zementbindung

Abstract
Heart- and sapwood of poplar wood show different chemical properties, which affect their behaviour towards cement bonding. Water extractives of sapwood show a lower pH value and a higher puffering capacity towards alkali. Moreover, the content of water soluble carbohydrates is higher in sapwood than in heartwood. Water extractives of sapwood delay the hydration of cement to a higher extent than those of heartwood. Differences related to the clone type have been also detected. Cement composites made from sapwood were, however, generally of higher strength properties than those made of heartwood. The difference in strength properties is still remarkable even after 8 weeks of storage. The pH value and puffering capacity of the composites made from sap- and heartwood showed no significant differences.

: http://publica.fraunhofer.de/documents/PX-27762.html