Abstract This paper presents an experimental study on the performance of shielding refractory concretes containing new types of cements for use in the radiation protection technology. Three concretes with corundum aggregate and special refractory inorganic cements belonging to the CaO–Al2O3, SrO–CaO–Al2O3–ZrO2, SrO–Al2O3 and BaO–CaO–Al2O3–ZrO2 systems were tested. The products formed in the hydration of these binders were detected by SEM-EDS. The linear attenuation coefficients obtained from measurements with γ quanta emitted by the following sources: 22Na, 137Cs, 60Co, 133Ba and 152Eu in the range of 80–1408 keV were determined twice, firstly after casting and drying (110 °C) of concretes, and secondly after sintering at 1400 °C. Especially, this work fills the gap in the literature providing the gamma rays attenuation properties of cement-containing heat-resistant corundum concretes in the energy region between 779 keV and 1112 keV. The experimental setup equipped with the ORTEC GMX25P4-70 High Purity Germanium detector (HPGe) cooled with liquid nitrogen was used for determination of the gamma-ray linear attenuation coefficients of new materials. The role of the cement on the compressive and bending strengths, pore structure (mercury intrusion porosimetry), phase composition (XRD, FT-IR) and microstructure (SEM-EDS) of heat-treated concretes was reported. It was found that the incorporation of Sr or Ba and Zr elements with cements improved the attenuation properties of corundum-based concretes, in comparison to the concretes containing Ca. The doping alkaline earth elements i.e. Sr and Ba were chemically bonded within both hydraulic matrix of green concretes and ceramic matrix formed in concrete through sintering at 1400 °C. Hence, these materials with gamma radiation shielding capacity are designed for special construction applications.

中文翻译：

---

含掺钡和掺锶水泥的耐火混凝土材料的设计、结构、微观结构和伽马辐射屏蔽性能

摘要 本文介绍了含有新型水泥的屏蔽耐火混凝土用于辐射防护技术的性能试验研究。测试了三种含有刚玉骨料的混凝土和属于 CaO-Al2O3、SrO-CaO-Al2O3-ZrO2、SrO-Al2O3 和 BaO-CaO-Al2O3-ZrO2 系统的特殊耐火无机水泥。通过SEM-EDS检测在这些粘合剂的水合中形成的产物。通过测量以下来源发射的 γ 量子获得的线性衰减系数：在 80-1408 keV 范围内的 22Na、137Cs、60Co、133Ba 和 152Eu 被确定两次，第一次是在混凝土浇铸和干燥（110°C）之后，其次是在 1400 °C 下烧结后。尤其，这项工作填补了文献中的空白，这些文献提供了含水泥耐热刚玉混凝土在 779 keV 和 1112 keV 之间的能量范围内的伽马射线衰减特性。配备液氮冷却的 ORTEC GMX25P4-70 高纯锗探测器 (HPGe) 的实验装置用于测定新材料的伽马射线线性衰减系数。报告了水泥对热处理混凝土的抗压和抗弯强度、孔隙结构（汞侵入孔隙率）、相组成（XRD、FT-IR）和微观结构（SEM-EDS）的作用。研究发现，与含有 Ca 的混凝土相比，将 Sr 或 Ba 和 Zr 元素与水泥混合可改善刚玉基混凝土的衰减性能。掺杂碱土元素即 Sr 和 Ba 在生混凝土的水力基体和混凝土中通过 1400 °C 烧结形成的陶瓷基体中化学键合。因此，这些具有伽马辐射屏蔽能力的材料专为特殊建筑应用而设计。