Reactive belite stabilization mechanisms by boron-bearing dopants

摘要: Belite-rich cements hold promise for reduced energy consumption and CO{sub 2} emissions, but their use is hindered by the slow hydration rates of ordinary belites. This drawback may be overcome activation belite doping. Here, doping mechanism B Na/B in belites reported. For B-doping, three solid solutions have been tested: Ca{sub 2-x/2{open_square}x/2}(SiO{sub 4}){sub 1-x}(BO{sub 3}){sub x}, 2}(SiO{sub x}O{sub x/2} 2-x}B{sub x}(SiO{sub x}. The experimental results support substitution silicate groups tetrahedral borate with concomitant calcium boron charge compensation, Otherwise, coupled Na/B-doping has also investigated 2-x}Na{sub x} series confirmed to exist a large range x values. Along this series, {alpha}'{sub H}-C{sub 2}S main phase (for {>=} 0.10) single = 0.25. Finally, new structural description borax developed H}-Ca{sub 1.85}Na{sub 0.15}(SiO{sub 0.85}(BO{sub 0.15}, which fits better activated Rietveld mineralogical analysis.