减水剂对全尾砂胶结充填料浆流变性的影响

以全尾砂胶结充填料浆为研究对象,采用桨式旋转流变仪定量分析了聚羧酸(PC)、萘系(PNS)和三聚氰胺系(PMC)三种高效减水剂对料浆流变性能(屈服应力与塑性黏度)和触变性的影响。结果表明:掺入减水剂的料浆流变行为符合Bingham模型;三种类型减水剂掺入料浆后均能降低屈服应力、塑性黏度和触变环面积,且掺量越高降低幅度越大,料浆流变性改善效果越好。三种类型减水剂对料浆流变性改善程度存在差异,其中PC作用效果最好。随着养护龄期的增加,料浆的屈服应力、塑性黏度和触变环面积随之增大,减水剂对料浆流变性的作用效果减弱。

Influence of Superplasticizers on Rheology of Cemented Tailings Backfill

The influence of superplasticizers (SPs) including polycarboxylate (PC), polynaphthalenesulfonate(PNS) and polymelaminesulfonate(PMS) on the rheological properties(yield stress and plastic viscosity) and thixotropy of cemented tailings backfill (CTB) mixtures were quantitatively analyzed by using Brookfield RST-SST rheometer in this paper. The results indicate that the rheological characteristics CTB mixture follow the Bingham model with the incorporation of SPs. Inspite of SP type, the addition of superplasticizer will reduce the yield stress, plastic viscosity and hysteresis loop area of CTBs, and these rheological properties and thixotopy improved with increasing the content of SP. PC was found to be the most effective SP in improving the of fresh CTB. However, with increasing of hydration time, the yield stress, plastic viscosity and hysteresis loop area of CTB increase and the effects of SPs also decrease with hydration time.