Fig. 13From: Synergetic Influence of Microcrystalline Quartz and Alkali Content in Aggregate on Deterioration of Concrete Railroad Ties Used for 15 Years in High-Speed RailwaysRepresentative microstructures of fractured surfaces for a Brand-new, b Non-cracked, c Longitudinal-cracked, and d Map-cracked in SEM SE images.Back to article page