29Si NMR Characterization of Silica Tetrahedron in the Silica Fume Simulate Hydration
As the major structure of silica fume, the change of silica tetrahedron in the pozzolanic reaction during the hydration has not been revealed clearly in previous studies.In this study, 29Si solid-state MAS NMR was used to characterize the silica tetrahedron change of the silica fume in saturated alkali solution with 0.9, 1.2, 1.5 and 1.8 four different calcium/silica ratios.The amorphous Q4 silica tetrahedron structure in silica fume changed into Q1 silica tetrahedron at 1 day.Q2 silica tetrahedron formed from Q1 silica tetrahedron within 3 days.Q1 and Q2 silica tetrahedron reached a balance until silica fume completed pozzolanic reaction and the Q4 silica tetrahedron exhausted.The coexistence of Q1 and Q2 silica tetrahedron benefited the physical properties increase of cementitious system.29Si solid-state MAS NMR results proved that the chain length of silica tetrahedron in C-S-H shortened in the silica fume hydration while the C/S ratio increased.
Silica fume Silica tetrahedron Hydration Nuclear magnetic resonance
Xiaojun Wang Xiaoyao Wang Hongfei Zhu Cheng Qian
College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009,China Department of Building Engineering, Tongji University, Shanghai 200092, China;Department of Civil En
国内会议
苏州
英文
120-123
2013-10-25（万方平台首次上网日期，不代表论文的发表时间）