One of the difficult points of concrete traceability is that a product number or product data can not be pasted directly on fresh concrete due to its flow ability. In this study, several types of IC-Tags and concrete were unified by mixing on agitator. The behavior of IC-Tags at concrete work, influence of them on concrete and responsiveness of them by the radio wave were evaluated through the actual construction steps. Besides, suitable number of IC-Tag for reliable detection from the hardened concrete was estimated. From these results, it was demonstrated that IC-Tags could be apply to concrete traceability.

Satoshi FUJIMOTO-ーーー ＊ 1Takaaki OHKUBO-ーー ＊ 2 Yugo YOSHIMINE- ーーーー ＊ 3 Yuki HIRAHARA-ーーー ＊ 4Technical feasibility to mix-in IC tags into ready-mixed concrete is discussed, focusing on RF communication performance under flowing conditions. Firstly, flowing conditions (i.e. flow speed, concrete thickness) at agitating truck chute and pumping pipe is summarized based on on-site measurement and standard specifications. Secondary, experimental method and RF communication performance index for RF communication is proposed. It has been estimated that 20-40% of IC tags could be found and captured, while non are data read-writable. On-site experiment result was highly consistent with the experimental estimation.

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