Supplementary cementitious materials (SCMs) have been widely used not only in civil engineering concrete components, but also in (nuclear) waste treatment engineering because of their beneficial effects on microstructure, engineering properties and durability of concrete. A comprehensive experimental campaign has been undertaken to investigate the effects of SCMs, which includes silica fume (SF) and blast furnace slag (BFS) in combination with ordinary Portland cement (OPC) on the behaviour of hydration heat evolution during early ages of mortars. The samples with different water/cement (w/c) ratios (0.5, 0.7, 0.9) and replacement ratios of SF (10%, 20%, 30%) and BFS (30%, 50%, 70%) were subjected to isothermal calorimetry tests at various temperatures (20, 30, 40 and 50 °C) in order to assess the effects of SCMs on the rate of hydration heat, cumulative heat release, activation energy and setting times of blended mortars. Knowledge obtained from these blended systems was then applied for cementation of a heavy metal containing waste sludge simulant, where the potential for thermal cracking and delayed ettringite formation due to hydration heat generation is of great concern. Results show that both BFS and SF increase the hydration rate but reduce cumulative heat release compared to pure OPC mortar. The ternary system (OPC:BFS:SF) exhibits different hydration characteristics compared to the binary system (OPC:BFS(or SF)) and there is a slight interaction between BFS and SF. The presence of sludge in the matrix significantly accelerates the hydration process and reduces the apparent activation energy. The role of temperature is more important for mortars containing BFS rather than SF, and less pronounced for the system containing sludge. Estimating the setting times based on the isothermal calorimetry data is more accurate for the final setting time rather than for initial setting time and an overestimation of 10% might occur or even more for the system containing sludge, which is still acceptable taking into account the measurement uncertainty.

补充胶凝材料（SCM）不仅广泛用于土木工程混凝土组件中，而且由于其对混凝土的微观结构，工程性能和耐久性具有有益作用，因此还广泛用于（核）废物处理工程中。已经开展了一项全面的实验活动，以研究SCM（包括硅粉（SF）和高炉矿渣（BFS）与普通硅酸盐水泥（OPC）结合）对砂浆早期水化热演化行为的影响。将水/水泥（w / c）比（0.5、0.7、0.9）和SF（10％，20％，30％）和BFS（30％，50％，70％）的替代比不同的样品进行处理等温量热测试在各种温度（20、30、40和50°C）下进行，以评估SCM对水化热速率的影响，混合砂浆的累积热量释放，活化能和凝固时间。从这些混合系统中获得的知识随后被用于胶结含有重金属的废泥模拟物，在这种情况下，由于水合生热而产生的热裂和延迟钙矾石形成的潜力非常令人关注。结果表明，与纯OPC砂浆相比，BFS和SF均可提高水合速率，但会减少累积的热量释放。与二元系统（OPC：BFS（或SF））相比，三元系统（OPC：BFS：SF）表现出不同的水化特性，并且BFS和SF之间存在轻微的相互作用。基质中污泥的存在显着加速了水合过程并降低了表观活化能。对于含BFS而不是SF的砂浆，温度的作用更为重要，并且对于含污泥的系统来说不太明显。根据等温量热数据估算凝结时间对于最终凝结时间比初始凝结时间更为准确，对于含污泥的系统，可能会高估10％甚至更高，考虑到测量结果，这仍然可以接受不确定。