标题: UNIST Develops Single-Sided Ultrasonic Monitoring for 3D-Printed Concrete, with R² Up to 0.975 [打印本页] 作者: admin 时间: 2026-11-4 08:14 标题: UNIST Develops Single-Sided Ultrasonic Monitoring for 3D-Printed Concrete, with R² Up to 0.975 On November 2, 2026, Nanjixiong learned that Professor Shin Myoung-su's team at South Korea's Ulsan National Institute of Science and Technology, UNIST, had developed a single-sided ultrasonic nondestructive testing method. It can determine in real time whether a lower printed concrete layer has reached sufficient early strength for continued printing.
Conventional ultrasonic strength testing requires embedded sensors or access to both sides. The new method needs only an acrylic plate with two sensors attached vertically to one side of the print. As concrete hardens, more ultrasound propagates into it and the received signal weakens, allowing curing to be inferred. Tests using three concrete mixes produced coefficients of determination between the ultrasonic indicator and measured early strength of R² = 0.927–0.975.
The research appears in the November issue of Cement and Concrete Composites. Validation currently uses small three-layer specimens with 15 mm layers. The next step is full-scale construction.
Nanjixiong's Observations
Knowing when the next layer can be printed is a key practical issue in concrete printing. Single-sided attachment lowers the barrier to on-site testing and could eventually link with printers to adjust speed automatically.
AI-translated from an article by Kuaixiong on Nanjixiong, originally published on 2026-11-02. Text and images retain the original source attribution. Read the original Chinese article
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