【作者】 沈业青； 邓敏； 陆安群；

【Author】 SHEN Yeqing1,DENG Min2,LU Anqun2 (1.College of Chemistry and Materials Science,Anhui Key Laboratory of Functional Molecular Solids,Anhui Normal University,Wuhu 241000,Anhui,China; 2.College of Materials Science and Engineering,State Key Laboratory of Materials-oriented Chemical Engineering,Nanjing University of Technology,Nanjing 210009,Jiangsu,China)

【机构】 安徽师范大学化学与材料科学学院安徽省功能性分子固体重点实验室； 南京工业大学材料科学与工程学院材料化学工程国家重点实验室；

【摘要】 利用上海光源小角散射线站技术先进性优势,测试超低水灰比水泥水化早期水化产物分形结构,研究水化水泥早期微结构的演变。水泥早期水化产物双分形结构表明,水泥水化硅酸钙纳米凝胶颗粒随机堆积,内外层水化产物中纳米凝胶分别具备不同的结构自相似性;内层水产物中高密度凝胶堆积紧密,早龄期时随水化时间增加,堆积密度降低。外层水产物中低密度凝胶堆积松弛,早龄期时随水化时间增加,堆积密度也在降低;水化诱导期生成结构最为致密的凝胶产物层,诱导期后,凝胶堆积密度演变速度随水化反应速度的增加而增加,水化反应平缓,凝胶堆积密度的演变速度也趋于平缓。更多还原

【Abstract】 Advanced synchrotron SAXS was applied for measure of fractal microstructure of hydrating cement at early age.Fractal structure of the hydration products indicates that nano C-S-H particles are packed randomly.Double fractal results from two types of structural self-similarity locating in the inner and outer hydration products respectively.Packing of the HD C-S-H within the inner hydration productions is dense,and packing density degrease with hydration,while packing of the LD C-S-H within the outer hydration productions is looser,and packing density also degrease with hydration.The densest packing of nano C-S-H is produced at the induction period of hydration.Speed of packing density evolution increase with hydration of cement.But after acceleration period,the speed becomes flat.更多还原