Tohoku University Technology: The measurement of early age concrete strength before demolding: T21-062
Enable on-site, nondestructive, simple and accurate measurement of early age concrete strength
There is a guideline that concrete structure should not be demolded (removal of the mold) until the initial strength reach at a sufficient level. A simple and accurate strength measurement method is required before demolding in order to shorten the construction time. Conventionally, specimens should be prepared to measure the strength so it is time-consuming and costly. The some pin penetration methods are available, e.g. for shotcrete in tunnels, but they are not easy to introduce because of expensive specialized equipment requirements. The strength measurement on BOSS specimen which is extra-constructed on a structure is also known for its high accuracy, but it requires time for separating the specimen from the structure and does not allow the compressive test on-site. Other non-destructive test methods also exist, but there is no method applicable before demolding. This invention is about a simple technique for measuring the concrete strength on-site, from the pre-demolding stage, using a pin penetration device. The configuration of the measuring section and equipment enables high accurate measurement with reduced influence of coarse aggregate in a non-destructive manner.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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