Polymer-modified cement (PMC) composites are extensively utilized in modern construction, especially in tunneling and structural applications, but their excessive flowability and reduced thixotropy continue to present fundamental rheological challenges. We present a novel approach to improving the rheological performance of PMC via surface-modified graphene oxide (GO), i.e., GOPMC composites. Specifically, the flow behavior of GOPMCs in relation to shear stress–shear strain response and apparent viscosity were investigated. The rheological parameters were analyzed by using Herschel–Bulkley's model. Additionally, zeta potential and dispersion analysis were conducted to investigate interparticle interaction forces. Flow measurement confirmed ∼20 % lower flowability of the GOPMC than the reference PMC. GOPMC composites further displayed higher yield stress of ∼82 % and ∼33 % reduced viscosity with inherent decreased shear-thickening compared to reference PMC composites. The yield stress of the GOPMC composite increased over time, disclosing distinct structural evolution linked to enhanced hydration kinetics by GO. Additionally, GO nanosheets in the GOPMC altered the rheopectic behavior of the redispersible polymer and enhanced the degree of thixotropy by ∼80 %, attributable to the promotion of bridged flocculated structures which produces a rigid system, facilitated by particle interaction forces comprising of van der Waals and steric forces. This latter observation provides a mechanistic framework for the enhanced rheological performance of GOPMC composites aiming at broader civil engineering and construction sector applications beyond tunneling.

聚合物改性水泥（PMC）复合材料广泛应用于现代建筑，特别是隧道和结构应用中，但其过度的流动性和降低的触变性继续带来基本的流变学挑战。我们提出了一种通过表面改性氧化石墨烯（GO）（即 GOPMC 复合材料）来提高 PMC 流变性能的新方法。具体来说，研究了 GOPMC 的流动行为与剪切应力-剪切应变响应和表观粘度的关系。使用 Herschel-Bulkley 模型分析流变参数。此外，还进行了 Zeta 电位和色散分析来研究颗粒间相互作用力。流量测量证实 GOPMC 的流动性比参考 PMC 低约 20%。与参考 PMC 复合材料相比，GOPMC 复合材料进一步表现出较高的屈服应力，约 82% 的屈服应力和约 33% 的粘度降低，以及固有的剪切增稠性降低。GOPMC 复合材料的屈服应力随着时间的推移而增加，揭示了与 GO 增强的水化动力学相关的独特结构演化。此外，GOPMC 中的 GO 纳米片改变了可再分散聚合物的流变行为，并将触变程度提高了约 80%，这归因于桥联絮凝结构的促进，该结构产生了刚性系统，由范德华力组成的颗粒相互作用力促进了桥联絮凝结构的形成。和空间力。后一种观察结果为增强 GOPMC 复合材料的流变性能提供了一个机械框架，旨在实现隧道以外更广泛的土木工程和建筑领域应用。