| Abstrakt: |
Abstract: This paper deals with an analytical and experimental investigation of the mechanical and physical properties of wood-wool slabs. Analytically, the material is treated as a composite where the cement paste acts as the matrix and the wood-wool as randomly oriented long fibers. The mechanical properties of the composite are derived by the laws of mixture. The effect of the random orientation of the wood fibers is taken into consideration by the introduction of dimensionless factors which are derived on the assumption that the geometric centers of the wood fibers are uniformly distributed in space and that any fiber has an equal probability to being oriented at any angle to the direction of the applied stress. Explicit expressions are derived for the various elastic rigidities of the slabs as well as the ultimate strengths in bending, tension and compression. Wood-wood samples with varying wood content and wood-cement ratio are tested in flexure, direct tension, axial compression, torsion, water absorption, impact, permeability, combustibility, creep and shrinkage. The test results are shown to be in good agreement with theoretically predicted values. |
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