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In situ monitoring of pore structure of magnesium oxysulfate cement paste: Effect of MgSO4/H2O ratio
Shengwen Tang,Changrong Wei,Rongjin Cai,Jiasheng Huang,E. Chen,Junhui Yuan 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
This work systematically presented the pore structure evolution of different magnesium oxysulfate(MOS) cement pastes by non-contact impedance measurement (NCIM), fractal theory and othermicrostructural experiments. According to the evolution of electrical impedance response, threehydration stages (dissolution, acceleration and hardened stages) can be identified in the pastes. Furthermore, based on the results obtained from NCIM and fractal theory, the porosity, incremental porevolume, pore tortuosity, average pore diameter and maximal pore diameter of MOS cement pastes areinvestigated. The influence of MgSO4/H2O ratio on pore structure of MOS cement paste is primarilyexplained. It can be inferred from predicted and experimental results that NCIM is a good method toanalyze the microstructure evolution of MOS cement pastes in-situ.