Abstract C-S-H seeds have potential application as accelerators in oil well cementing pastes. Typical oil well conditions present elevated temperatures; nevertheless, is not clear how such temperatures affect the nucleation process induced by these seeds. In this work, class G cement pastes were blended with up to 5.0% of C-S-H seeds and cured at 25, 40 and 60 °C. Hydration kinetics results showed that the nucleation effect from C-S-H seeds accelerated the reaction by decreasing the apparent activation energy of pastes. This acceleration was more effective at lower temperatures. Nano-mechanical results showed that the main phases obtained from the hydration of cement paste blended with C-S-H seeds are capillary porous material and low density C-S-H. It was concluded that this higher amount of loosely packed hydrates is consequence of an increase in the number precipitation spots, and that their packing density depends on the curing temperature, and amount of C-S-H seeds used.

中文翻译：

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CSH种子在不同温度下加速硅酸盐水泥的水化

摘要 CSH 种子在油井固井膏中作为促进剂具有潜在的应用价值。典型的油井条件呈现高温；然而，尚不清楚这样的温度如何影响这些种子诱导的成核过程。在这项工作中，G 级水泥浆与高达 5.0% 的 CSH 种子混合，并在 25、40 和 60 °C 下固化。水合动力学结果表明，CSH 种子的成核效应通过降低糊剂的表观活化能来加速反应。这种加速在较低温度下更有效。纳米力学结果表明，掺有CSH种子的水泥浆水化得到的主要相是毛细多孔材料和低密度CSH。