The effects of gamma irradiation on concrete properties during early hardening were studied towards radioactive waste storage or accelerated processing at precast plants. Concrete mixtures containing different mineral aggregates (baryte, magnetite, amphibolite) were investigated. During initial 16 hours of hardening the mixes were irradiated using ⁶⁰Co gamma source at the rate of 3.5 kGy/h. The mechanical properties and microstructural features of irradiated early-age concrete were tested: the secant elastic modulus, the compressive strength, the porosity and pore size distribution. XRD and SEM analysis were also performed. The results indicate both the stiffening and pore refinement in concrete due to early gamma irradiation. Effects of early irradiation on microstructural features of cement matrix were found in the subsurface layer up to the depth of 2 mm. The influence of different mineral aggregates in concrete on the radiation-induced changes of early age properties is discussed.

研究了在早期硬化过程中，伽马辐射对混凝土性能的影响，旨在放射性废料的储存或预制工厂的加速加工。研究了包含不同矿物骨料（硼酸盐，磁铁矿，角闪石）的混凝土混合物。在硬化的最初16小时内，使用⁶⁰辐照混合物伽玛射线源的速率为3.5 kGy / h。测试了早期辐照混凝土的力学性能和微观结构特征：割线弹性模量，抗压强度，孔隙率和孔径分布。还进行了XRD和SEM分析。结果表明，由于早期的伽马射线辐照，混凝土的硬化和细化都得到了体现。在2 mm的深度的地下层中发现了早期辐照对水泥基体微观结构特征的影响。讨论了混凝土中不同矿物聚集体对辐射引起的早期性能变化的影响。