The method of determining physical properties of concrete (concrete) structure are provided with a built-in optical fiber.; The physical properties of the concrete method for determining the structure with a built-in optical fiber according to the invention; The step of placing the concrete in the shape of the building structure is designed based;; Further comprising: a built-in part of the optical fiber to be embedded is a part of the removed portion of the cladding (clad) of the optical fiber to a predetermined depth in at least one side of the concrete structure; And; And input an input light having a predetermined wavelength to one end of the optical fiber, comprising the steps of analyzing the output light emitted from the other end thereof; as including a generally to process control to predict the concrete strength or quality at an early stage in a construction site reflected by reliable prevent insolvency construction with high construction quality and ensure the structural stability of the building and the air speed to help cure can be measured in real time, the durability decreases due to the ion changing the concrete after completion, reduce labor, costs It has a characteristic such as a reduction.
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