利用溶胶凝胶技术合成了一种新型的活性 β C2 S ,并采用扫描电镜和固体核磁共振分析等方法对其早期水化进行了研究 .发现 :材料水化活性很高 ,水化 1d时 ,出现了棒状或管状的Ⅰ型C S H结构 ,但其阴离子聚合状态未发生变化 ;水化 3d ,7d...利用溶胶凝胶技术合成了一种新型的活性 β C2 S ,并采用扫描电镜和固体核磁共振分析等方法对其早期水化进行了研究 .发现 :材料水化活性很高 ,水化 1d时 ,出现了棒状或管状的Ⅰ型C S H结构 ,但其阴离子聚合状态未发生变化 ;水化 3d ,7d时 ,以网络状的Ⅱ型C S H为主 ,体系中出现了二聚态的硅酸根 ;水化 2 8d时 ,Ⅱ型C S H粒子继续长大 ,在某些微区出现了尺寸较大的Ⅰ型C S H及由其叠合而成的花朵状C S H ,二聚态硅酸根的数量进一步增多 ,体系的微观结构更加致密 .展开更多
In this paper, several dicalcium silicates (β-C2S) obtained from impurities have been studied. A study of the structure and properties of these doped dicalcium silicates reveals that the doping with MgO of BaSO4 enha...In this paper, several dicalcium silicates (β-C2S) obtained from impurities have been studied. A study of the structure and properties of these doped dicalcium silicates reveals that the doping with MgO of BaSO4 enhanced their activity and rate of hydration, K2O has a similar effect rough less pronounced.The lattice distortion and crystal size in β-dicalcium silicates are measured by X-ray powder diffraction technique, the binding energies of 2P3 for Ca and 2P for Si are obtained by X-ray photoelectric spectrum, the vibrations of the chemical bonds in silicate anion 〔SiO4〕4- are examined by FT-IR and Laser Raman spectra and the heat evolution during hydration reaction for β-dicalcium silicates are determined by microcalorimetry. From the results of XRD, XPS, FT-IR, Raman and micro- DSC, the relationship between the microstructure and properties of doped dicalcium silicates and the mechanism of activation due to impurities are discussed. It is pointed out that the essential factors causing the enhancement of activity and acceleration of hydration reaction are the lattice distortion, crystal size,intercrystalline imperfections, the crystallochemical environment change and chemical shifts of the electron binding energies of Ca and Si atoms in doped β-dicalcium silicates.展开更多
对水泥矿物之一β-C_2S 的粉磨过程进行了摩擦化学研究,用 X 射线微观应力测定法和正电子湮没技术(PAT)测定了粉磨过程中β-C_2S 晶格畸变和结构缺陷的变化,从形变的微观机制对测试结果进行了探讨。测定了不同粉磨时间样品的比表面积,...对水泥矿物之一β-C_2S 的粉磨过程进行了摩擦化学研究,用 X 射线微观应力测定法和正电子湮没技术(PAT)测定了粉磨过程中β-C_2S 晶格畸变和结构缺陷的变化,从形变的微观机制对测试结果进行了探讨。测定了不同粉磨时间样品的比表面积,粒径分布和水化放热速率,解释了不同大小颗粒水化活性差异的原因。展开更多
文摘利用溶胶凝胶技术合成了一种新型的活性 β C2 S ,并采用扫描电镜和固体核磁共振分析等方法对其早期水化进行了研究 .发现 :材料水化活性很高 ,水化 1d时 ,出现了棒状或管状的Ⅰ型C S H结构 ,但其阴离子聚合状态未发生变化 ;水化 3d ,7d时 ,以网络状的Ⅱ型C S H为主 ,体系中出现了二聚态的硅酸根 ;水化 2 8d时 ,Ⅱ型C S H粒子继续长大 ,在某些微区出现了尺寸较大的Ⅰ型C S H及由其叠合而成的花朵状C S H ,二聚态硅酸根的数量进一步增多 ,体系的微观结构更加致密 .
文摘In this paper, several dicalcium silicates (β-C2S) obtained from impurities have been studied. A study of the structure and properties of these doped dicalcium silicates reveals that the doping with MgO of BaSO4 enhanced their activity and rate of hydration, K2O has a similar effect rough less pronounced.The lattice distortion and crystal size in β-dicalcium silicates are measured by X-ray powder diffraction technique, the binding energies of 2P3 for Ca and 2P for Si are obtained by X-ray photoelectric spectrum, the vibrations of the chemical bonds in silicate anion 〔SiO4〕4- are examined by FT-IR and Laser Raman spectra and the heat evolution during hydration reaction for β-dicalcium silicates are determined by microcalorimetry. From the results of XRD, XPS, FT-IR, Raman and micro- DSC, the relationship between the microstructure and properties of doped dicalcium silicates and the mechanism of activation due to impurities are discussed. It is pointed out that the essential factors causing the enhancement of activity and acceleration of hydration reaction are the lattice distortion, crystal size,intercrystalline imperfections, the crystallochemical environment change and chemical shifts of the electron binding energies of Ca and Si atoms in doped β-dicalcium silicates.
文摘对水泥矿物之一β-C_2S 的粉磨过程进行了摩擦化学研究,用 X 射线微观应力测定法和正电子湮没技术(PAT)测定了粉磨过程中β-C_2S 晶格畸变和结构缺陷的变化,从形变的微观机制对测试结果进行了探讨。测定了不同粉磨时间样品的比表面积,粒径分布和水化放热速率,解释了不同大小颗粒水化活性差异的原因。
