โ Scribed by S.A.S. Akers; M. Partl
No coin nor oath required. For personal study only.
This paper presents a study of basic properties of fibre cement composites related to expansion and shrinkage (thermal and hygraO. It is aimed at providing a fundamental understanding of the material in order to describe its behaviour when exposed to natural weathering conditions. The migration of pore water and interrelated shrinkage stress of the products have been studied using model environmental chamber experiments. It is pointed out that movement of water within the product can be very complex and that a product exposed to the environment can experience complex stress concentrations depending on the density and/or pore size distributions and rate of absorption or loss of water. The build-up of stresses in aged products occurred at a slower rate than for non-aged products. Also the density of the product plays a very important role in the rate and build-up of stresses and this property appears to override the pore size distribution of certain composites.
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