Abstract
ABSTRACT Hydrophobic treatment for cementitious material is one of the effective methods to improve the durability of concrete structures. In this study, the pore system of cementitious materials modified by a new type of carboxylic acid hydrophobic agent is reconstructed by X-ray computed tomography technology. The changes in porosity, the connectivity degree in 2D / 3D space, the tortuosity and permeability of samples with hydrophobic agents are investigated. The experimental and simulation results show that the addition of a hydrophobic agent will tremendously increase the volume of a large pore but the solid phase observed in pore space can be confirmed to be the calcium carboxylate flaky crystals which modify the water transportation channels. In conclusion, the change of transportation channel from the surface can explain the hydrophobicity of cement pastes in the presence of a hydrophobic agent. This study provides a new perspective to reveal the hydrophobic mechanism of cement-based materials and guidance to design the new microstructure of cementitious materials
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