Batista Giovanni Dos Santos, Puertas Francisca, Takimi Antonio Shigueaki, da Costa Eleani Maria, Palacios Marta
School of Technology, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Avenida Ipiranga, 6681, Porto Alegre 90619-900, Brazil.
Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC), C/Serrano Galvache, 4, 28033 Madrid, Spain.
Materials (Basel). 2025 Jan 8;18(2):239. doi: 10.3390/ma18020239.
This study investigates the rheological behavior of oil well cement pastes (OWCPs) modified with core/shell TiO@SiO (nTS) nanoparticles and polycarboxylate-ether (PCE) superplasticizers at different temperatures (25, 45, and 60 °C). Results show that nTS particles increased static and dynamic yield stresses and the apparent viscosity of the cement slurries due to an increased solid volume fraction and reduced free water availability. The increase in the slurry dispersion by adding PCE superplasticizers enhanced the effect of the nanoparticles on the rheological parameters. Oscillation rheometry demonstrated that nTS nanoparticles enhanced the structural buildup, while PCE retarded hydration. Furthermore, slurries hydrated at 60 °C experienced higher initial values of the elastic modulus and a faster exponential increase in this rheological parameter due to the acceleration of the cement hydration.
本研究调查了用核壳结构TiO@SiO（nTS）纳米颗粒和聚羧酸醚（PCE）高效减水剂改性的油井水泥浆（OWCPs）在不同温度（25、45和60°C）下的流变行为。结果表明，由于固体体积分数增加和自由水可用性降低，nTS颗粒提高了水泥浆体的静态和动态屈服应力以及表观粘度。添加PCE高效减水剂使浆液分散性增加，增强了纳米颗粒对流变参数的影响。振荡流变学表明，nTS纳米颗粒增强了结构形成，而PCE延缓了水化。此外，由于水泥水化加速，在60°C下水化的浆体具有更高的初始弹性模量值，且该流变参数呈指数增长更快。
