摘要: A study of boron-containing aggregates from the United 8tates and England seven heavy Japan is reported. Data are presented discussed concerning mix proportions, workability, unit weight, strength, drying shrinkage, absorption coefficients for gamma - xrays. Based on data obtained formulas estimating weight concrete specific gravity aggregate proposed. The hematite ore used found to be unsuitable because an excessive amount fines coating its surface. tests indicate that, boron- containing material, deleterious effects colemanite strength setting time greater than that borocalcite. This effect increases with increased fineness. barite concretes provide better shielding against x-rays anticipated density calculations. Barite or magnetite more suitabie in rays. (auth)
concrete.org
sci-hub.st 参考文章(0)