Numerical calculation on the porosity distribution and diffusion coefficient of interfacial transition zone in cement-based composite materials

作者：Jiang Jin yang^*; Sun Guo wen; Wang Cai hui

来源：Construction and Building Materials, 2013, 39: 134-138.

DOI：10.1016/j.conbuildmat.2012.05.023

• Cement-based composite materials
• Interfacial transition zone
• Diffusion coefficient
• Porosity distribution

Based on the cement particles distribution characteristic of interfacial transition zone (ITZ) in cement-based composite materials and modified powers model, a numerical calculation model is proposed to predict the porosity distribution, average porosity and effective diffusion coefficient of chloride ions in ITZ. The model takes into account the influence of water-to-cement ratio, the thickness of ITZ and the degree of hydration on the porosity distribution of ITZ. The results show that the ratio of the capillary porosity of ITZ to that of bulk cement paste (phi(ITZ)/phi(B)) and the ratio of the diffusion coefficients of chloride ions in ITZ to that in bulk cement paste (D-ITZ/D-B) are almost consistent with those in published papers. In addition, the results of numerical calculation further confirm the diffusion coefficient of ITZ is 10 times as much as that of bulk cement paste.

• 出版日期2013-2
• 单位东南大学