Stabilizing properties of polyhexamethyleneguanidine hydrochloride, tetraphelylphosphonium chloride, polyethyleneimine, and thiocarbamide were evaluated in order to determine their influence on the long-term stabilization of Tc in a Portland cement compound. The modifying agents’ effect on the mechanical strength under air-wet conditions was investigated. Possible impact of modifiers on the intensification of bacterial processes was taken into account during the investigation. A 2-5-fold reduction in pertechnetate leaching was observed when the investigated additives were applied. Addition of polyhexamethyleneguanidine hydrochloride was deemed preferable as it simultaneously ensured stabilization of Tc properties, provided the mechanical strength required, and protected the cement matrix from the biological degradation.

评估了聚六亚甲基胍盐酸盐、四苯基氯化鏻、聚乙烯亚胺和硫脲的稳定性，以确定它们对波特兰水泥复合物中 Tc 长期稳定性的影响。研究了改性剂在气湿条件下对机械强度的影响。调查期间考虑了改性剂对细菌过程强化的可能影响。当应用所研究的添加剂时，观察到高锝酸盐浸出减少了 2-5 倍。添加聚六亚甲基胍盐酸盐被认为是优选的，因为它同时确保了 Tc 特性的稳定性，提供了所需的机械强度，并保护了水泥基体免受生物降解。