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A water permeability model of nano-reinforced cement pastes based on GEM theory and multifractals

Yuan Gao, Hongwen Jing, Zefu Zhou, Xinshuai Shi, Zhenlong Zhao
Published: 18 October 2021

Abstract: A theoretical model is presented to predict the water permeability of nano-reinforced cement pastes from its pore structure, including the pore size distribution, pore interconnection, porosity and microcracks. The model is based on the General Effective Media (GEM) theory and multifractals, which considers both the bridging roles in microcracks and capillary pores and the filling roles in the nano gel pore of nano-admixtures reinforcing cement pastes. For comparison, a hybrid graphene oxide, multi-walled carbon nanotube was selected as a nano-reinforced material mixed into cementitious composites, for the water permeability experiments. The calculated results show good agreement with the experimental measurements, decreasing the maximum error from 67.8% to 9.7%, compared with the previously proposed GEM theory. Moreover, the theoretical calculation results suggest that the reinforcing roles of nano-admixtures in cement paste to strengthen the permeability-related properties may be mainly due to the bridging effects in microcracks and capillary pores, rather than filling the nano gel pores. The findings of this study enrich our understanding of the mechanism of nano-admixture reinforcing cement-based materials and can measure the permeability of cementitious composites directly, instead of using time-consuming methods.
Keywords: model / cement pastes / pore / reinforced cement / carbon nanotube / permeability

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