Current technical knowledge on the rheological behavior of cemented paste backfill (CPB) that contains nano-silica (nS) at different curing temperatures is insufficient. However, the assessment and an understanding of the yield stress and viscosity of CPB with nS added at the early ages are critical for using CPB technology in underground mines located in cold or warm regions and/or for deep mining. Therefore, the aim of this study is to investigate and develop a better understanding of the combined effects of temperature, addition of nS as an additive, and type of binder on the rheological properties of CPB. To this end, several CPB samples with different compositions are subjected to various temperatures (2 °C, 20 °C, and 35 °C) for up to 4 h. The yield stress and viscosity of the CPB samples are then measured at different time intervals of 0 min, 15 min, 1 h, 2 h, and 4 h. Moreover, electrical conductivity (EC) monitoring, and microstructural analyses (TG/DTG and XRD) are conducted on the samples. It is found that the yield stress and viscosity of the samples cured at 35 °C are much higher than the other samples. The enhancement of the rheological properties of CPB due to the coupled impacts of nS as an additive and higher temperature leads to reduced flowability of the paste. However, it is also found that the addition of a superplasticizer can partially compensate for the fluidity. Also, an increase in the water content reduces the yield stress and viscosity. The findings presented in this paper will contribute to the development of nano-CPB technology and its effective application in the backfilling operations of underground mines.

当前有关在不同固化温度下包含纳米二氧化硅（nS）的胶浆回填（CPB）流变行为的技术知识不足。但是，评估和了解在早期添加nS的CPB的屈服应力和黏度对于在寒冷或温暖地区的地下矿井中使用CPB技术和/或深部开采至关重要。因此，本研究的目的是研究和更好地理解温度，添加nS作为添加剂以及粘合剂类型对CPB流变性能的综合影响。为此，将具有不同成分的几个CPB样品置于各种温度（2°C，20°C和35°C）下最多4小时。然后，以0分钟，15分钟，1小时，2小时和4小时的不同时间间隔测量CPB样品的屈服应力和粘度。此外，还对样品进行了电导率（EC）监测和微结构分析（TG / DTG和XRD）。发现在35℃下固化的样品的屈服应力和粘度比其他样品高得多。由于nS作为添加剂和较高温度的耦合影响，CPB流变性能的增强导致糊料的流动性降低。但是，还发现添加高效减水剂可以部分补偿流动性。而且，水含量的增加降低了屈服应力和粘度。