Improvement of relaxation of frost hydraulic pressure and mechanical properties of concrete by water-repellent high strength ceramics

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The aim of this study was to develop the new technology which can reduce the decrease of strength by entrapped air in AE concrete and contribute the improvement of frost resistance of concrete. The concept of this technology is that the high strength and water-repellent ceramic porous powder which have similar pore structure to concrete would be able to relieve the hydraulic pressure during freezing. Because the vacant capillary pore of powder would play a role of air void entrained by AE agent. It was clarified that the porous powder can improve the frost resistance of concrete ; however, it cannot reduce the decrease of strength because it has air entraining property due to water-repellency on the surface. Therefore, it is necessary to develop the high strength porous powder which is hydrophobic in the pore and hydrophilic on the surface in order to improve the problem.