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In this study, the crack self-healing performance of the heavyweight concrete used in the walls of containers and structures designed to shield radioactive materials was investigated. A steam curing temperature that preserves self-healing properties and demolding strength was identified. The presented simultaneously mixing method using the expanding material and the fly ash in the process of admixture can maximize the self-curing performance. Also adding synthetic fibers in the heavyweight concrete improved the self-healing performance., {"references":["Kitsutaka Y., Ogawa Y., Yokomuro T., Igawa H. (2014), Evaluation of x-ray shielding performance for concrete box culvert by using x-ray digital image and double layer value analysis method, Proceedings of the Japan Concrete Institute, 36(1), 1990-1995, (in Japanese).","Sakamoto H. (2016), Shielding of radiation by concrete, Journal of Concrete Technology, 31(6), 63-68, June","Sindou Y., Ueda T., Watanabe T. (2010), Study on self-healing effect of fly ash concrete, Proceedings of the Japan Concrete Institute, 32(1), 137-142, (in Japanese).","Kurita T., Hosoda A., Kobayashi K., Matuda Y. (2009), Influence of the nature of curing water on the healing effect of self-healing concrete, 31(1), 247-252, (in Japanese).","Koide T., Kishi T., Ahn T., (2012), Fundamental research on self-healing concrete using granulated self-healing materials for cracks, and blast furnace slag aggregate, Proceedings of the Japan Concrete Institute, 34(1), 1408-1413, (in Japanese).","Arai K., Kitsutaka Y., Tamura M. (2004), Study on the degradation restoration performance and evaluation of the concrete using special mixture material, Summaries of technical papers of annual meeting Architectural Institute of Japan, 207-208, (in Japanese).","Igawa H., Yokomuro T., Kitsutaka Y., Eguchi H. (2015), Reserch on self-healing performance of heavyweight concrete, Cement Science and Concrete Technology, 69(1), 335-340.","Koda M., Mihashi H., Nishiwaki T., Kikuta T., (2011), Experimental study on self-healing capability of FRCC using synthetic fibers, Summaries of technical papers of annual meeting Architectural Institute of Japan, 777-778, (in Japanese)"]}