Exploration of Waterproofness of Concrete and Alkali-Aggregate Using Hydrophobic Impregnation and Coating

Part of the tunnel spoil can not be used for concrete due to alkali-aggregate reaction (AAR). Water is an indispensable condition AAR, so separating from water great benefit controlling AAR. This paper investigates modification and aggregate by hydrophobic impregnation organic coating then evaluates their waterproof mechanical properties dynamic contact angle (DCA), ultrasonic wave velocity, scanning electron microscope (SEM), nuclear magnetic resonance (NMR), on. For waterproofness, both improve waterproofness aggregate. The suitable because it wrap well. And coated PVA interfacial transition zone (ITZ). properties, materials will weaken strength interface. Furthermore, made with shows plastic deformation has a good correlation film thickness, estimation model based on thickness proposed. finds which provides new idea application in seepage control facilities conservancy projects.