ABSTRACT
ABSTRACT ASR, chloride attack, freezing and thawing action, etc., can affect concrete structures and ingress of water through the surfaces increases the risk of the damage. In other words, the penetration of water into concrete may characterize the deterioration process. In this research, absorbed water in concrete was nondestructively visualized by neutron imaging at RIKEN Accelerator-driven compact Neutron Source, RANS. ASR-damaged concrete specimens with various expansion rates were tested for eight days and water absorbed at each point of time was detected as a neutron image. Consequently, the water penetration was dependent on the expansion rate. A compact neutron source can be a tool accessible for direct observation of water in concrete and water penetration may become a one of concrete property.
