Possibility of using different types of Egyptian serpentine as fine and coarse aggregates for concrete production

From Hazardous Chrysotile and Polyamide Wastes into Sustainable Serpentine/Polyamide Nanocomposite Membrane: Fabrication, Characterization, and Environmental Application

“…The microscopic investigations for some of the collected representative serpentinites (Figure 2a) by a polarizing light microscope (Nikon) in both PPL and CPL (Figure 2b-d) showed that chrysotile (Ctl) is the dominant serpentine phase in Wadi Atalla serpentinites with a reasonable occurrence of dolomite (Dol) and a minor presence of magnetite (Mag) and lizardite (Lz). The predominance of Ctl, which is marked by folded and sheared fibers, over the other serpentine polymorphs (Lz) indicates a high degree of the experienced serpentinization processes [17,[27][28][29][30]. Magnetite (Mag) is also the product of hydrothermal alteration of the harzburgite.…”

“…and lizardite (Lz). The predominance of Ctl, which is marked by folded and sheared fi over the other serpentine polymorphs (Lz) indicates a high degree of the experience pentinization processes [17,[27][28][29][30]. Magnetite (Mag) is also the product of hydrothe alteration of the harzburgite.…”

“…Electro-spinning, as a low-cost and very simple technique, is the most applied approach in fabricating organic and inorganic nanofibers due to the high surface area, high porosity, superior permeability, excellent mechanical features, manageability, and unique physical characteristics [16]. Serpentinite, the ultramafic rock that is mainly composed of serpentine (SP) polymorphs (antigorite, chrysotile, and lizardite with chemistry Mg 3 Si 2 O 5 (OH) 4 but variable crystalline structures), is the alteration product of magnesium-rich silicates such as dunite, peridotite, and pyroxenite via serpentinization processes [17]. Serpentinization is the most important alteration process to occur in ultramafic rocks, which accompanies the formation of the ocean floor [18].…”

Autoclave-free ultra-early strength concrete preparation using an early strength agent and microstructure properties

“…The properties of ITZ were much important for concrete. [40][41][42] The microhardness at both interfacial transition zone (ITZ) and matrix of concrete at different ages was tested, and the results are shown in Fig. 6.…”

Deep Insights into the Radiation Shielding Features of Heavy Minerals in Their Native Status: Implications for Their Physical, Mineralogical, Geochemical, and Morphological Properties

“…Although concrete is the most prevalent material used to mitigate natural disasters [24] and man-made radiation leakages, a recent trend has occurred with respect to the exploitation of such minerals as native materials (in their original state, without their embedding as aggregates or additives in concrete, composites, or polymers), replacing concrete and cement pastes [25]. The most common types of these natural materials are serpentine minerals [26], halloysite [27,28], barite [29,30], chambersite [31], magnetite, limonite, hematite [30], granite [32,33], serpentinite rocks [34], garnet [35], and quartz [36]. The purposes of this trend are to (1) decrease the pollution resulting from the use of cement as a result of the use of concrete, (2) reduce the energy and costs stemming from the cement industry, (3) exploit the massive reserves of these minerals, which have no benefit to be used as nuclear waste landfills, (4) exploit additional space using thinner shielding walls, and (5) reduce the amount of maintenance that is needed compared to that which is needed for concrete.…”