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用不同细度的铁矿粉、细度为76μm(200目)硅粉和G级油井水泥,制备了不同密度的水泥浆并测定其流变性能。用扫描电子显微镜观察了硬化水泥浆体的微观形貌,并讨论了铁矿粉在水泥浆中的分布状态对于水泥浆流变性能的影响,结果表明:在硬化高密度水泥浆中,惰性的铁矿粉和硅粉分散在水化产物连续基体中;其浆体的致密程度由水泥的水化产物控制;最紧密堆积理论不能指导高密度水泥浆的配方设计。优先采用细铁矿粉配制水泥浆,易于获得流变性能合格的高密度水泥浆。
With different fineness of iron ore powder, fineness of 76μm (200 mesh) silica fume and grade G oil well cement slurry of different densities were prepared and its rheological properties were measured. The microstructure of the hardened cement paste was observed by scanning electron microscopy. The influence of iron ore powder distribution in the cement slurry on the rheological properties of the cement paste was also discussed. The results show that in the hardening high-density grout, the inert Iron ore powder and silica fume are dispersed in a continuous matrix of hydration products; the denseness of the slurry is controlled by the hydration products of cement; the closest packing theory can not guide the formulation design of high-density grouts. Prefer to use fine iron ore powder to prepare cement slurry, easy to get rheological properties of qualified high-density grout.