Title: Properties of Radiation Shielding Concrete
Author(s): Kazuhisa Shirayama
Publication: Journal Proceedings
Appears on pages(s): 261-280
Reports on a study of boron-containing aggregates from the United States and England and of seven heavy aggregates from Japan. Data are presented and discussed concerning mix proportions, workability, unit weight, strength, drying shrinkage, and absorption coefficients for gramma-and x-rays. Based on data obtained for mix proportions, formulas for estimating the unit weight of concrete from the specific gravity of the aggregate are proposed. The hematite ore used was found to be unsuitable for concrete aggregate because of an excessive amount of fines coating its surface. The tests indicated that, of the boron-containing material, the deleterious effects of colemanite on concrete strength and setting time is greater than that of borocalcite. This effect increases with increased fineness. The barite concretes provided better shielding against x-rays than anticipated from density calculations. Barite or magnetite concretes were more suitable in shielding against gamma rays.