The rheological behavior of paste prepared from hemihydrate phosphogypsum and tailing

• Published in: Construction & building materials 2019-12, Vol.229, p.116870, Article 116870
• Main Authors: Jiang, Guanzhao, Wu, Aixiang, Wang, Yiming, Li, Jianqiu
• Format: Article
• Language: English
• Subjects: Flow ability; Hemihydrate phosphogypsum; Rheological parameters; Rheological stability; Thixotropy
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.116870

•The paste prepared from hemihydrate phosphogypsum and tailing (HTP) will be applied in mine filling.•The hemihydrate phosphogypsum hydration was unfavorable to the HTP rheological stability.•HTP was a new engineering paste with good flow ability, low resistance and proper rheological stability.•This work may be a preliminary guide in the HTP mixing and transport process. The paste prepared from hemihydrate phosphogypsum (HPG) and tailing (HTP) differs greatly from the cement tailings paste (CTP). The rheological behavior of HTP including the visual flow ability and rheology was uncovered in the present study. The suitable mass concentration of HTP was determined by fluidity and bleeding tests firstly. Then, the rheological parameters and thixotropy were analyzed based on rheological tests. Compared with CTP, HTP has higher ultimate yield stress, smaller yield stress and plastic viscosity, and shorter thixotropic time. Finally, the rheological properties with different resting time and shearing time were studied. The results showed that the rheological stability deteriorated with time, especially in the resting state. The special rheological behavior of HTP may be attributed to the stable mosaic structure, which was related to the particles size and shape. In addition, the HPG hydration will enhance the structure, resulting in the rheological stability of HTP weakening gradually. This work may pave ways to the understanding of the HTP mixing and transport process.