水下不分散浆体的流变性能试验研究

Experimental Study on Rheological Properties of Underwater Non-Dispersible Slurry

针对水下不分散浆体的流变性能,本文考虑了UWB-II型絮凝剂掺量和减水剂掺量对净浆的工作性能及流变性能的影响及作用机理,并进一步探究浆体流动度与屈服应力之间的关系。结果表明:低掺量絮凝剂可以提高净浆的流动度,并减小其屈服应力,其中0.5%~1.5%掺量的絮凝剂会使流动度增大143.5%~147.1%,屈服应力的降幅为55.8%~80.1%,而高掺量絮凝剂则会显著增加净浆的屈服应力、粘度与稠度。固定絮凝剂掺量为2%时,0.5%~1%的减水剂掺量会起到降低净浆流动度和流变参数的作用,并提出了浆体流动度与屈服应力之间关系的计算模型。In view of the rheological properties of underwater non-dispersible slurry, the influence and mechanism of the dosage of UWB-II flocculating agent and superplasticizer on the workability and rheological properties of the slurry in underwater non-dispersible concrete were considered, and the relationship between the fluidity and yield stress of the slurry was further explored. The results show that a low dosage of flocculating agent improves the fluidity of the paste and reduces its yield stress. 0.5%~1.5% dosage of flocculating agent increases fluidity by 143.5%~147.1% and reduces yield stress by 55.8%~80.1%. However, a high dosage of flocculating agent significantly increases the yield stress, viscosity, and consistency of the paste. When the fixed flocculating agent dosage is 2%, a superplasticizer dosage of 0.5% to 1% plays a role in reducing the fluidity and rheological parameters of the paste, and a calculation model of the relationship between slurry fluidity and yield stress is proposed.