Coal gasification slag-derived highly reactive silica for high modulus sodium silicate synthesis: Process and mechanism

Carbon-Absorbing Inorganic Coating with Ultrahigh Bonding Strength for Concrete: Bonding, Durability Performances, and the Underlying Mechanisms

“…The consumption of Ca 2+ leads to the formation of a silicon-enriched layer mainly consisting of Si–O groups (presenting as H 4 SiO 4 in water) around the γ-C 2 S core. The Si–O–H bonds in adjacent H 4 SiO 4 units interconnect into Si–O–Si bonds through dehydration–condensation (eq ), resulting in the highly polymerized silica gel layer . Meanwhile, the condensation of a portion of H 4 SiO 4 units in the water film forms silica gel among the generated CaCO 3 phase, which results in the outer layer.…”

“…The Si−O−H bonds in adjacent H 4 SiO 4 units interconnect into Si−O−Si bonds through dehydration− condensation (eq 10), resulting in the highly polymerized silica gel layer. 77 Meanwhile, the condensation of a portion of H 4 SiO 4 units in the water film forms silica gel among the generated CaCO 3 phase, which results in the outer layer. The thickness of the product layer increases with carbonation, hindering further diffusion and dissolution of CO 2 as well as further dissolution of Ca 2+ .…”