Magneto-responsive cementitious materials with magnetic interventions enable on-demand and real-time adjustment of rheology. This research aims to elaborate the early-stage magneto response of cement pastes using different types of Fe₃O₄ particles and carbonyl iron particles. A series of methods to evaluate the magnetorheological response of cementitious materials were established. The magneto-responsive cement pastes were tested by shear test and small amplitude oscillation shear test at constant and time-varying magnetic fields. The increase of static yield stress and storage modulus after applying a magnetic field was a time-dependent process, while the decrease of static yield stress and storage modulus was an instant process at the moment of removing magnetic fields. Such a procedure can be reversibly controlled in real time. The cement pastes containing different magneto-responsive particles showed significant difference in the onset of flow and structural build-up. With the intervention of a magnetic field, the static yield stress and storage modulus of mixtures with carbonyl iron particles were able to increase with one order of magnitude. Compared with the particle size distribution and particle morphology, the magnetic parameters of magneto-responsive particles dominated the magnetorheological properties of cementitious materials. Shear tests were found the most effective to evaluate the magneto response of cement pastes with the intervention of a magnetic field.

具有磁性干预的磁响应胶凝材料可以实现流变学的按需和实时调整。_{本研究旨在阐述使用不同类型的 Fe 3} O ₄颗粒和羰基铁颗粒的水泥浆体的早期磁响应。建立了一系列评价胶凝材料磁流变响应的方法。通过恒磁场和时变磁场下的剪切试验和小振幅振荡剪切试验对磁响应水泥浆体进行了测试。施加磁场后静态屈服应力和储能模量的增加是一个随时间变化的过程，而静态屈服应力和储能模量的下降是在去除磁场的瞬间的瞬时过程。这样的过程可以实时可逆地控制。含有不同磁响应颗粒的水泥浆在流动开始和结构形成方面表现出显着差异。在磁场的干预下，含羰基铁颗粒的混合物的静态屈服应力和储能模量能够增加一个数量级。与粒径分布和颗粒形貌相比，磁响应颗粒的磁参数主导了胶凝材料的磁流变性能。研究发现，剪切试验是评估磁场干预下水泥浆磁响应的最有效方法。