1H LF-NMR study on water migration behavior of fresh cement paste with limestone powder

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2025-02-13 DOI:10.1016/j.cemconres.2025.107802

Jing Qiao , Chunsheng Zhou , Jingjing Feng , Miao Miao , Yanliang Ji , Linan Gu

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Abstract

Limestone powder (LS) with large particle sizes is widely used, but its effect on water migration behavior remains unclear. This study investigates the influence of LS and viscosity-enhancing admixtures (VEAs) on the water migration behavior and water distribution in fresh cement paste using ¹H low-field nuclear magnetic resonance (LF-NMR). Results indicate that LS increases the size of water migration channels, accelerates the water migration rate, and raises the bleeding ratio, while VEAs substantially mitigate the effects of LS. Compared to polyacrylamide, cellulose ether significantly slows down the water migration rate before 40 min, thereby reducing the bleeding ratio. Additionally, relaxation times were found to decrease during bleeding and can reflect the sedimentation process. It is confirmed that the pore structure of fresh paste exhibits fractal characteristics, with the fractal dimension closely correlating with water migration rates. The underlying mechanisms and their implications on material behavior are thoroughly analyzed and discussed.

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石灰石粉鲜水泥浆体水迁移行为的1H LF-NMR研究

大粒径石灰石粉被广泛应用，但其对水迁移行为的影响尚不清楚。利用1H低场核磁共振（LF-NMR）研究了LS和增粘外加剂（VEAs）对鲜水泥浆体中水迁移行为和水分布的影响。结果表明，LS增加了水迁移通道的大小，加快了水迁移速度，提高了放水率，而VEAs则显著减轻了LS的影响。与聚丙烯酰胺相比，纤维素醚显著减缓了40 min前的水分迁移速度，从而降低了出血性。此外，松弛时间在出血过程中减少，可以反映沉积过程。证实了鲜膏体的孔隙结构具有分形特征，分形维数与水分迁移速率密切相关。潜在的机制及其对材料行为的影响进行了深入的分析和讨论。

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产品信息

阿拉丁

hydroxypropoxy methoxy cellulose (CE)

来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.