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Computers and Concrete
  Volume 13, Number 3, March 2014 , pages 309-323

Numerical investigation on tortuosity of transport paths in cement-based materials
Xiao-Bao Zuo, Wei Sun, Zhi-Yong Liu and Yu-Juan Tang

    Based on the compositions and structures of cement-based materials, the geometrical models of the tortuosity of transport paths in hardened cement pastes, mortar and concrete, which are associated with the capillary porosity, cement hydration degree, mixture particle shape, aggregate volume fraction and water-cement ratio, are established by using a geometric approach. Numerical simulations are carried out to investigate the effects of material parameters such as water-cement ratio, volume fraction of the mixtures, shape and size of aggregates and cement hydration degree, on the tortuosity of transport paths in hardened cement pastes, mortar and concrete. Results indicate that the transport tortuosity in cement-based materials decreases with the increasing of water-cement ratio, and increases with the cement hydration degree, the volume fraction of cement and aggregate, the shape factor and diameter of aggregates, and the material parameters related to cement pastes, such as the water-cement ratio, cement hydration degree and cement volume fraction, are the primary factors that influence the transport tortuosity of cement-based materials.
Key Words
    tortuosity; cement-based materials; model; geometric approach; numerical simulation
Xiao-Bao Zuo and Yu-Juan Tang: Department of Civil Engineering, Nanjing University Of Science & Technology, Nanjing, 210094, P.R.China
Wei Sun: Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing, 211189, P.R.China
Zhi-Yong Liu: College of Civil Engineering, Yantai University, Yantai, 264005, P.R.China

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