Can J Civ Eng 35:751–755Īlexandrov KS, Ryzhova TV (1961) The elastic properties of crystals. Furthermore, this chapter includes various data from own investigations and from other published research to provide a comprehensive overview of the different slate properties and to enable the reader to work with it.Īlam MR, Swamidas ASJ, Gale J, Munaswamy K (2008) Mechanical and physical properties of slate from Britannia Cove, Newfoundland. The optical parameter includes colours and the identification of the different splitting surfaces of slates which give slate a distinct appearance. The physical properties of slate comprise hardness and abrasion, fissility, density and porosity, thermal conductivity and thermal expansion as well as hydric and hygric properties. Other strength parameter like the compressive strength or the Young’s modulus are important in respect to safety calculations during mining. Emphasis is put on the bending strength since it is the most important and only required strength parameter for roofing slate. In this chapter, the rock-mechanical properties of slate are described, considering especially the dependence of the different strength values in respect to the orientation to the cleavage plane. Since not only slate in strict sense is used for roofing, the different and relevant fissile stone types are shortly introduced. Both, mineralogy and the fabric govern the overall character of a slate and are therefore thoroughly explained. The anisotropy is caused by the cleavage plane which is composed of mica layers and thus, highly depends on the mineralogical composition and the fabric of a slate. Slate stands out from other stones due to its pronounced anisotropy, affecting more or less intensely all properties of the slate.
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