Abstract

The purpose of this study was to determine the strength of local casuarina glauca patchwood under artificial weathering presenting the changes of strength of wood along fibers. The study involved wood of similar density - half factorial design experiment was used with four factors to use fewer samples to have a total of 8. The specimens were exposed to artificial weathering consisting of soaking wood in water, drying at 60 °C, and exposure to UV radiation. Three-step aging cycle was repeated 8 times. In general, the tested wood species changed their compressive strength differently under the influence of artificial weathering. The process of artificial weathering caused a loss of strength of all tested wood species. The extent of changes depended on initial properties of wood (especially density) and anatomy. Two experiments were implemented; one with vertical patch-wood alignments and the other with horizontal patch-wood alignments.

Since this research was conducted to determine the strength of block boards made from local casuarina glauca wood, the strength was determined in the longitudinal direction. it is conducted that the strength of block boards can carry a normal stress of (185.75 N/mm2) with 3 points bending test and in the vertical alignment. whilst with 4 points bending test, it can carry a normal stress of (158.55 N/mm2). The weakest can carry a normal stress of (60.31 N/mm2) while on 4 points bending test it can carry a normal stress of (52.60 n/mm2). It was determined that the presence of intermediate biscuit did not help in the strength but it weakens the wood but helps only after the cycling variable. Also, it was determined that PVAc is better the M.U.F. However, the horizontal alignment experiment recorded a shear force result of (3.54 N/mm2) in the 3 points-test and (2.5 N/m2) in the 4 points test while the weakest can carry a force of 0.94 for both tests.

Department

Construction Engineering Department

Degree Name

MS in Construction Engineering

Graduation Date

Fall 9-1-2020

Submission Date

2-16-2021

First Advisor

Khaled nassar

Committee Member 1

khaled nassar

Committee Member 2

ossama elhosseny

Committee Member 3

salah elhagar

Extent

101 p.

Document Type

Master's Thesis

Institutional Review Board (IRB) Approval

Approval has been obtained for this item

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