关键词: 石灰石粉;动态屈服应力;稠度;经时行为

Abstract: The variation of rheological parameters with hydration time for the cement-ground limestone paste was studied and the rheology of cement-ground limestone paste was measured through the rotational viscometer of RHEORIAB QC type, the related rheological parameters was obtained by fitting paste rheological curve based on Herschel-Bulkley model. Dynamic yield stress and consistence of cement-ground limestone paste were fitted respectively by models proposed by Roussel and Philippe. The results show that the dynamic yield stress of cement paste is smaller than ground limestone paste, while the consistency is larger. The dynamic yield stress and consistency of cement-ground limestone paste linearly increase with hydration time; the increasing rate of the dynamic yield stress and consistency linearly decrease with the increasing mixing amount of ground limestone, and the initial dynamic yield stress linearly increase, while the consistency increases at first then decreases and presents a quadratic parabolic law.

Key words: ground limestone;dynamic yield stress;consistency;time-dependent behavior