The development of microstructure of cement-based materials should be mainly responsible for the time dependences of their rheological properties. In this paper, a series of structural kinetics constitutive models were established to predict the time-evolutions of the rheological properties of fresh cement paste under different working conditions. The models were developed from the Hershel-Bulkley model by combining a kinetic equation of the structural parameter λ and the relationships between rheological parameters and the structural parameter. The effects of shear rate, thixotropy and cement hydration on the structural breakdown and structural build-up were considered in the kinetic equation. Meanwhile, the specific parameters of Portland cement paste in the kinetic equation were estimated according to the experimental data of published literatures. Moreover, the reliability of the new models was further validated by comparing the experimental results with the predicted value of dynamic and static yield stresses of cement pastes under mixing and rest. Thus, the relationship for Portland cement between the development of microstructure and the rheological properties had been established.

水泥基材料微观结构的发展应主要负责其流变性的时间依赖性。本文建立了一系列结构动力学本构模型，以预测在不同工作条件下新鲜水泥浆的流变特性的时间演变。通过结合结构参数λ的动力学方程以及流变参数与结构参数之间的关系，从Hershel-Bulkley模型开发模型。在动力学方程中考虑了剪切速率，触变性和水泥水化对结构破坏和结构堆积的影响。与此同时，根据已发表文献的实验数据估算了硅酸盐水泥浆体动力学方程中的具体参数。此外，通过将实验结果与混合和静置状态下水泥浆动态和静态屈服应力的预测值进行比较，进一步验证了新模型的可靠性。因此，建立了硅酸盐水泥的微观结构发展与流变性能之间的关系。