Study on the estimation method of the mechanical characteristics and internal stresses of existing dam concrete

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Many concrete dams were constructed for hydroelectric power generation in Japan to meet the growing electric power energy demand after World War II. More than 40 years have passed already since the construction of these dams. For their appropriate maintenance, it is necessary to establish a safety evaluation method for dams based on their present conditions. That is, to verify the long-term safety of an existing dam, the mechanical properties of concrete that composes the dam must be accurately evaluated and the upgrade of the prediction methd of an internal stress of the dam concrete is also necessary. As a result, it was proposed the method to estimate a Young's modulus of dam concrete from the Yonug's modulus of the cement paste and the aggregate based on the composite theory. In addition, as a result of simulation of the gravity-type dam it was clarified that the probability of cracking of surface concrete increased when self-shrinkage was considered.