Petrology and geochemistry of some Egyptian granitic rocks: Evaluation of physical and mechanical properties of the granites used as construction materials.

Document Type : Original Article


1 Geology Department, Faculty of Science, Al-Azhar University, PO Box 11884, Nasr City, Cairo, Egypt

2 Department of Geological Sciences, National Research Center, Dokki Cairo, Egypt


Abstract. The current study deals with the field geology, petrography, and geochemistry of some Egyptian granitic rocks and its suitability for construction materials. Also, the present work aims to determine the physical and mechanical properties of some granite in the northeastern Desert of Egypt to detect their suitability for ornamental stones. Granitic rocks are regarded as one of the most significant commercial commodities and are utilized for a variety of uses, including as decorative stones. The main applied tests of physical and mechanical properties include compressive strength, apparent porosity, specific gravity, water absorption, abrasion resistance, thermal expansion, weather and frost resistance, and acidic resistance. The study district geologically is forming moderately high mountainous ridges with hard topography and curly peaks. The collected sample petrographically divided into biotite monzogranites, alkali feldspar granites, and riebeckite- arfvedsonite granites (peralkaline granites). Meanwhile, the chemical classification of these granites was distributed between the granite, granodiorite, syenodiorite, monzogranite, syenite, and alkali granite fields and all the studied samples have alkaline to peralkaline affinity and metaluminous to peraluminous nature and also classified as I-type orogenic granites and A-type anorogenic granites. The studied samples were cutting according to the American Society for Testing and Materials specifications (cubic shape) for detection the physical and mechanical properties. The compressive strength ranges from 795 to 979 kg/cm3, apparent porosity ranges from 0.35% to 0.58%, specific gravity ranges from 2.67 to 2.79 gm/cm2, water absorption ranges from 0.13% to 0.22%, abrasion resistance is good, thermal expansion ranges from 0.02 to 0.06, weather and frost resistance are good, and acidic resistance are good. It should be noted that the studied granitic samples showed good results according to mechanical and physical tests. So that it can be used in decoration purposes and construction materials


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