Abstract The impact of a hardening accelerator based on C-S-H seeding on the microstructure development and the autogenous shrinkage of low water-to-cement ratio (w/c) mortars is studied. C-S-H seeding leads to a significant refinement of the pore structure at early stages of hydration. In the w/c 0.35 mortar with C-S-H seeding, higher mechanical properties are measured up to 1 d; later the effect of seeding becomes insignificant. On the other hand, in the w/c 0.30 mortar the mechanical properties at later ages were reduced with C-S-H seeding. At the same time, the faster refinement of porosity due to seeding at very early ages leads to faster self-desiccation in all mortars. Consequently, lower RH is reached, which is accompanied by higher autogenous shrinkage of the mortars with C-S-H seeding. As a countermeasure, superabsorbent polymers (SAP) were employed as internal curing agents to reduce self-desiccation and autogenous shrinkage in mortars with seeding agents.

中文翻译：

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CSH播种和内养护砂浆的微观结构发展和自收缩

摘要 研究了基于 CSH 晶种的硬化促进剂对低水灰比 (w/c) 砂浆微观结构发展和自收缩的影响。CSH 引晶导致在水化的早期阶段显着改善孔隙结构。在带有 CSH 播种的 w/c 0.35 砂浆中，在长达 1 天的时间内测得更高的机械性能；后来播种的效果就变得微不足道了。另一方面，在 w/c 0.30 砂浆中，随着 CSH 播种，后期的机械性能降低。同时，由于在很早的年龄播种，孔隙度的细化速度更快，导致所有砂浆的自干燥速度更快。因此，达到了较低的 RH，这伴随着 CSH 播种砂浆的较高自收缩。作为对策，