indicates how intermediates between mica and chlorite might be formed. Giving Mand B+ the representative compositions [MgsAlSi301o(0H)2] and [Mg2Al(0H)e]+, the intermediate shown would have the composition KMg8AlsSi6020(0H)1o, and would have an effective interplanar distance on (001) of 24.3 A., just the sum of those for mica and chlorite. Chloritebrucite intermediates would probably be unstabl...

magnesium hydroxide mg(oh)2 nanorods with diameters of 90±10nm and lengths of more than 2μms were prepared by a simple route at ~75oc in ambient air. the approach is based on reaction of magnesium powder and de-ionized water without the use of any harmful, toxic or corrosive reagents. characterization using x-ray diffraction (xrd) shows single crystalline structure of mg(oh)2 (brucite) whereas ...

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This study investigated the effect of alkali content (Na:Al = 0.86 and 1.39) brucite (i.e., Mg(OH)2) mineral addition on sulfuric acid resistance alkali-activated metakaolin geopolymers). Geopolymers consist primarily a sodium-stabilized aluminosilicate hydrate (N-A-S-H) framework. Results demonstrate that higher contents improve N-A-S-H, as evidenced by reduced dealumination Si Na leaching upo...

Abstract Since reactive magnesia (MgO) is produced at a lower temperature than CaO and capable of sequestering significant quantities CO 2 , it considered to be technically superior more sustainable alternative Portland cement. To obtain maximum carbonation associated high strength, variety additives are investigated for MgO. Using amino acids as an additive new concept control the polymorphism...

The volume-increase associated with hydration reactions in rocks may lead to reaction-induced fracturing, but requires a stable water film be present at reactive grain boundaries even when subject compressive stress. Hydration of periclase brucite is solid volume increase ca. 110%. Recent experiments on the periclase-brucite system observed that effective mean stress exceeds 30 MPa, reaction ra...