Investigation of the Pozzolanic Reaction in Silica Fume-Cement Paste by 29Si MAS NMR

Lei Wang; Zhen He; Yun Dong

doi:10.4028/www.scientific.net/AMR.634-638.2774

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Investigation of the Pozzolanic Reaction in Silica Fume-Cement Paste by ²⁹Si MAS NMR
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 634-638Investigation of the Pozzolanic Reaction in Silica...

Investigation of the Pozzolanic Reaction in Silica Fume-Cement Paste by ²⁹Si MAS NMR

Abstract:

Pozzolanic reactivity of silica fume(SF) in silica fume-cement (SFC)pastes was studied by ²⁹Si MAS NMR combined with deconvoluton technique, respectively. The experimental results indicate that SF possess an high pozzolanic reactivity. About 41% of SF at 3d and about 96% at 120d have reacted in a paste with SF of 10% in mass. In the highly alkaline environment of the cement paste, monomers formed after the covalent bonds of Si-O-Si in SF were broken, which can connect C-S-H dimers to form highly polymerized C-S-H, and increase the ACL of C-S-H.