| 摘要 |
PROBLEM TO BE SOLVED: To provide a test hammer for underwater evaluation, capable of suitably and smoothly performing nondestructive quality evaluation of concrete constituting a concrete structure in water, based on a test hammer method established as an easy evaluation technique on ground, and also to provide a concrete compression strength evaluation method. SOLUTION: The test hammer for underwater evaluation for performing quality evaluation of concrete in water, based on the test hammer method, comprises: a Schmidt-type hammer body HM; and a water-tight encapsulating container VL water-tightly encapsulating the hammer body HM. The hammer further comprises: an enclosing part enclosing the hammer body HM; and a seal part slidably sealing a plunger 4 at a plunger protruding port AP. A space SC is provided between the enclosing part and the hammer body HM. A volume ratio represented by the relational expression "VS/VP" is set at "4", wherein VS is the volume of the space SC, and VP is the volume of the plunger 4. COPYRIGHT: (C)2007,JPO&INPIT
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