掺杂对硅铝酸二钙结构及水化活性的影响
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摘要
利用X射线衍射仪、微量热分析、扫描电子显微镜等,研究了MgO、BaO及MgO与Al_2O_3复掺对硅铝酸二钙C_2AS结构及水化活性的影响。结果表明,BaO掺杂对C_2AS的结构几乎无影响,3%掺量的MgO能促使C_2AS某一晶面的衍射峰增强。MgO与Al_2O_3复合掺杂可促进Q相的生成。较之MgO、BaO单掺,MgO与Al_2O_3复合掺杂可大幅提高C_2AS的水化活性,其7d的水化总放热量可达到400J/g。
Effect of MgO, BaO and MgO+Al_2O_3 doping on Structure and Hydration Reactivity of dicalcium aluminosilicate(C_2AS) was studied by X-ray diffraction, scanning electron microscopy and isothermal calorimetry. The results showed that BaO doping has almost no effect on the structure of C_2AS, and 3% MgO can promote the diffraction peak intensity of a crystal plane of C_2AS. MgO and Al_2O_3 doping can promote the formation of Q phase. Compared with MgO and BaO single doping, MgO and Al_2O_3 doping can greatly improve the hydration activity of C_2AS, and the total hydration heat of 7 d can reach 400 J/g.
Effect of MgO, BaO and MgO+Al_2O_3 doping on Structure and Hydration Reactivity of dicalcium aluminosilicate(C_2AS) was studied by X-ray diffraction, scanning electron microscopy and isothermal calorimetry. The results showed that BaO doping has almost no effect on the structure of C_2AS, and 3% MgO can promote the diffraction peak intensity of a crystal plane of C_2AS. MgO and Al_2O_3 doping can promote the formation of Q phase. Compared with MgO and BaO single doping, MgO and Al_2O_3 doping can greatly improve the hydration activity of C_2AS, and the total hydration heat of 7 d can reach 400 J/g.
引文
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[2]Scrivener k.L.,Cabiron R.L.High-performance concretes from calcium aluminate cements[J].Cement and Concrete Research,1999,28(8):1215-1223.
[3]Valentin A,Jadvyga K.The effect of temperature on the formation of the hydrated calcium calcium aluminate cement structure[J].Procedia engineering,2013,57:99-106.
[4]D.Damidot,B.Lothenbach,et al.Thermodynamics and cement science[J].Cement and concrete research,2011,41(7):679-695.
[5]姜奉华,郑少华.铝酸盐水泥系统中硅铝酸二钙向Q相的转变[J].硅酸盐学报,2005,33(4):462-466.
[6]姜奉华,徐德龙.微量组分对铝酸盐水泥系统中Q相形成的影响[J].硅酸盐学报,2005,33(10):1276-1280.
[7]姜奉华,徐德龙.含Q相铝酸盐水泥水化性能的研究[J].材料科学与工程学报,2005,23(2):279-281.