The rebound instrument was invented by Swiss scientist Schmidt in 1950.
The rebound instrument has a relatively simple structure and is small in size and light in weight, which makes it convenient to carry and has a fast testing speed.
This equipment received attention from relevant personnel in China in the 1950s, and it was not until the 1980s that this method began to be widely used for testing the strengthening of concrete.
During the experimental process, relevant theories were continuously summarized and its related content was improved.
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