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Effect of the Number and Orientation of Fractures on the P-Wave Velocity Diminution: Application on the Building Stones of the Rabat Area (Morocco)

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Geomaterials 2013年第3期3卷 71-81页

作者： Hamid el Azhari iz-eddine el am.ani el Hassani Université Mohammed V-Agdal (Maroc) Faculté des Sciences Département de Géologie Rabat Morocco Université Mohammed V-Agdal (Maroc) Institut Scientifique Département des Sciences de la Terre Equipe de Géomatériaux et Géo-Environnement (GeoM&E) Rabat Morocco

This study is focused on two types of Moroccan rocks, among the most widely used as building stones: the calcarenite of Salé (CS) and the marble of oued Akrech (MA). The two rocks, lithologically different, show a clear contrast of their P-wave velocities (Vp): 3.90 vs 5.10 km/s at dry state and 4.29 vs 5.64 km/s at saturation. The “Artificial fractures” created in the two rock types reveal that their Vp undergo diminutions which the rates vary depending of the number and the plane orientation of the fractures. In the CS, Vp shows an increasing of cumulative diminution (Dc) according to the number of fractures, but with a variable rate of unitary diminution (Du) from one fracture to the other. This defines a linear regression with a low coefficient of determination (Dc = 10.18NbFr + 10.96;r2 = 0.87). The mode of the Vp evolution would be related to the roughness of fractures surface, which itself depends upon the petrographic nature of the calcarenite (friable structure, high porosity and heterogenous composition). The MA manifested an increasing Dc with a fairly constant rate of Du from a fracture to another, giving a regression line with a high coefficient of determination (Dc = 12.17NbFr – 10.69;r2 = 0.99). This steady diminution of Vp would be related to the granoblastic texture and the monomineral composition of the marble, which engender smoother fracture surfaces. The rates of Vp diminution also depend on the orientation plane of the fractures relative to the direction of wave propagation. The fractures parallel (θ = 0°) amplify slightly the Vp, playing a significant role of “waveguide”. The fractures oriented at 45° lead to a diminution lower than those of fractures oriented at 25° and 90°. The same trend of diminution, but at variable rates, appears on the samples of the two types of stones at dry and saturated state. This can be explained by the compressive nature of P-waves, which obey the physic laws of the transmission of the constraints in the solid me

关键词： Fracture Diminution P-Wave Velocity Calcarenite Marble Morocco

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Effect of Carbon Graphite on the Crystallization of Andalusite: Application to the Synthesis of Mullite and the Improvement of Refractory Quality

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Materials Sciences and Applications 2013年第6期4卷 337-346页

作者： Chaouki Sadik iz-eddine el am.ani Abderrahman Albizane Department of Chemistry Faculty of Science and Technology University Hassan II Mohammedia-Casablanca Morocco Department of Earth Sciences Scientific Institute University Mohammed V Agdal Rabat Morocco

Different mixtures of Moroccan silica-alumina geomaterials were used for the preparation of refractory ceramics. A formula of composition (M2) has allowed obtaining a good quality of refractory. Addition of a small quantity of carbon (1%) to the M2 formula has substantially improved the quality of the refractory. The morphological, textural and mineralogical evolution, through SEM and XRD shows that the addition of carbon, which plays a catalytic role, favors the crystallization of andalusite. Then, from 1200°C, the andalusite starts to transform to primary mullite needles. At 1400°C, the mullite becomes the major mineral phase beside cristobalite and vitreous phase.

关键词： Refractory Alumina-Silica Andalusite Mullite Morocco

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Effects of Lizardite Addition on Technological Properties of Forsterite- monticellite Rich Ceramics Prepared from Natural Magnesite and Dolomite

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Journal of Construction Research 2020年第1期2卷 9-20页

作者： Ahmed Manni Achraf Harrati Abdelilah el Haddar Abdelwahed Chari Ali Sdiri Fahd Oudrhiri Hassani Abdeslam el Bouari iz-eddine el am.ani el Hassani Chaouki Sadik Laboratory of Physical Chemistry of Applied Materials(LPCMA) Department of ChemistryFaculty of Sciences Ben MsikHassan II University of CasablancaMorocco Laboratory of Applied Geosciences Faculty of SciencesUniversity of Mohammed 1OujdaMorocco Materials Sciences Energy and Nano-engineering DepartmentMohammed VI Polytechnic UniversityBen GuerirMorocco Department of Georessources and Environment National Engineering SchoolUniversity of SfaxP.Box 3052SfaxTunisia LMPEQ University of Cadi AyyadENSA of SAFIMorocco Geomaterials and Geo environment Team/Geo-Biodiversity and Natural Patrimony Laboratory (GEOBIO)/GeophysicsNatural Patrimony and Green Chemistry Research Centre(GEOPAC)Scientific InstitutMohammed V University of RabatMorocco

Lizardite rich peridotite has never been used to prepare ceramic specimens,especially in *** this raison,potential use of naturally abundant lizarditic material from the Rif domain,as a supply for ceramic industry,has been *** effects of lizardite addition to magnesite and dolomite mixtures on the thermomechanical properties of the calcined ceramics were also *** achieve this target,natural lizardite,magnesite and dolomite samples were collected in ultrabasic Beni Bousra *** raw samples were used for the synthesis of a forsterite-monticellite rich *** raw and sintered samples were characterized by x-ray diffraction,scanning electron microscope and fourier transform *** obtained results showed that both magnesite and dolomite were mainly composed of MgCO_(3) and CaCO_(3).In contrast,lizardite sample showed high amounts of SiO_(2),MgO and Fe2O_(3).An increased amount of lizardite in the initial mixtures enhanced mechanical and dimensional properties of the prepared ceramic specimens,and subsequently,the production of ceramics with the required technological ***,the preparation of Moroccan lizardite-based ceramics is technically feasible,economically justifiable and socially desirable due to the contribution to the economic growth of the raw materials sector,especially ceramic industry.

关键词： Forsterite Monticellite Lizardite Basic ceramics Temperature

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