cracks in concrete structures by lowering the durability and maintenance, repair costs, etc. of the problems caused as according to the University , and active studies have been made for reducing crack etc. institutions. Note also that by the admixture of these studies, a number of methods using the fiber or the like to control the shrinkage of the concrete will crack sikimeuroseo reduction is obtained. ; The purpose of this invention is compared to the cracking characteristics of the mixed concrete in a number of ways, evaluated in order to derive the optimal mixing conditions for the cracks, (a) the outer ring and the inner ring plate concentrically achieve the above placing; (B) pouring concrete between the outer ring and the inner ring, comprising: manufacturing a test piece by curing; And (c) measuring the bound amount of shrinkage stress and crack the concrete test sample; Plate consisting of: - to provide an evaluation method for concrete shrinkage crack of the ring-shaped lock test method
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