Mechanical properties of wood-cement composites | |
| Author | Sombat Bovornsombat |
| Call Number | AIT Thesis no. 796 |
| Subject(s) | Wood, Compressed Composite materials Cement |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The purpose of this study is to investigate the mechanical properties of wood-cement composites and to predict the essential properties for use in structural design. Analytically, the material is treated as a composite which consists of wood strips as fibres and cement paste as matrix and its properties are derived by the law of mixtures, The length of the wood strips are treated as randomly oriented long fibres in the plane parallel to the surface of the boards, Wood-cement board specimens with varying wood contents and wood-cement ratios were tested in flexure, axial compression, direct tension, torsion, expansion, water absorption, impact, permeability, combustibility, creep and shrinkage. Explicit expressions are given for its moduli of elasticity, ultimate strength, flexural and torsional rigidities in tension, compression, cylindrical bending and anticlastic loading respectively. The results obtained from the tests are found to be in reasonable agreement with theoretically predicted values especially for wood cement boards which have high wood content and low wood-cement ratios. This study showed that the mechanical properties of the composite can be determined from the law of mixtures provided that the presence of air voids can be taken into consideration by the introduction of various strength reduction factors, The creep property of the composites depends on the amount of the cement and varies inversely with the amount of air voids present. The shrinkage of the composite is nearly the same for specimens which have low wood content, For specimens which have high wood content, the shrinkage vary with wood-cement ratio. Wood-cement composites are combustible materials, but have high impact resistance, |
| Year | 1975 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Pama, Ricardo P. |
| Scholarship Donor(s) | Government of Italy |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1975 |