The effect of gamma-ray irradiation on cement mortar properties is investigated in this study in order to understand the mechanism behind the strength and stiffness reduction, which may be significant according to the available researches. ⁶⁰Co irradiation facility with the generating dose rate of 0.1–10 Gy/s and the total activity of 4.4·10¹⁵ Bq (120 kCi) was used to perform the irradiation, so that the total observed dose of the irradiated samples reached the values ranging from 12.0 to 15.0 MGy. An identical set of control samples was placed in the same laboratory conditions away from gamma radiation. The results of nanoindentation, X-ray diffraction analysis and mercury intrusion porosimetry of the irradiated and the control samples are shown and explained in detail in this study. The nanoindentation creep compliance and the nanoindentation elastic modulus of the irradiated and the control samples do not show any significant difference. The mineral composition obtained using the X-ray diffraction analysis of the irradiated and the control samples is also similar. The pore structure rearrangement and microcrack occurrence, which were evidenced by the mercury intrusion porosimetry and scanning electron microscopy, led to the porosity increase and may be attributed to the significant decrease of compressive strength.

为了了解强度和刚度降低背后的机理，本研究研究了伽马射线辐照对水泥砂浆性能的影响，根据现有研究可能是重要的。⁶⁰ Co辐照设施，产生剂量率为0.1–10 Gy / s，总活性为4.4·10 ¹⁵ 使用Bq（120 kCi）进行辐照，以使辐照样品的总观察剂量达到从12.0到15.0 MGy范围内的值。将一组相同的对照样品放在远离γ射线的相同实验室条件下。纳米压痕，X射线衍射分析和水银压入孔隙度的辐照和对照样品的结果显示并在本研究中进行了详细说明。辐照样品和对照样品的纳米压痕蠕变顺应性和纳米压痕弹性模量没有显示任何显着差异。使用辐照样品和对照样品的X射线衍射分析获得的矿物成分也相似。孔结构的重排和微裂纹的产生，