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不同矿物掺合料的硫铝酸盐水泥砂浆氯离子结合率研究

Study on the chloride ion binding rate of sulfoaluminate cement mortars containing different mineral admixtures.

作者信息

Wei Yuhang, Cao Zhonglu, Hou Jinfang, Li Bin, Jia Guanyuan, Chen Pang, Liu Ping

机构信息

CCCC Tianjin Port Engineering Institute Co., Ltd, Tianjin, 300222, China.

CCCC First Harbor Engineering Company Ltd, Tianjin, 300461, China.

出版信息

Sci Rep. 2024 Oct 16;14(1):24277. doi: 10.1038/s41598-024-75171-0.

DOI:10.1038/s41598-024-75171-0
PMID:39414904
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11484690/
Abstract

In this study, the chloride ion (Cl) binding rate of sulfoaluminate cement (SAC) mortars containing different mineral admixtures was investigated. This is essential to improve the durability of concrete structures in high Cl environments, especially where they are susceptible to Cl attack such as coastlines and marine structures. The effects of Cl concentration, curing age, and the type and amount of mineral admixture on the Cl binding rate of SAC mortars were analyzed. It was found that the content of water-soluble Cl in SAC mortars decreased with the increase of curing age, while the Cl binding ratio increased accordingly, indicating that its resistance to internal Cl permeation increased. The addition of fly ash (FA) and ground granulated blast furnace slag (GGBS) can significantly improve the Cl binding rate of SAC mortars, and the Cl binding rate increases to 46.6% with 20% of FA and 38.7% with 40% of GGBS. The effects of mineral admixtures on the microstructure and phase composition of SAC mortars were further investigated by X-ray diffraction (XRD) analysis. The results showed that the addition of FA and GGBS promoted the formation of C-S-H (calcium silicate hydrate) gels and improved the resistance of SAC mortars to Cl penetration. On the other hand, the excessive addition of silica fume (SF) decreased the Cl binding rate, whereas a moderate amount of limestone powder (LP) improved the Cl binding rate. The study of the Cl binding rate of SAC mortars can help to evaluate their resistance to Cl erosion in real projects, thus guiding the optimization of concrete formulations and the improvement of durability.

摘要

在本研究中，对含有不同矿物掺合料的硫铝酸盐水泥（SAC）砂浆的氯离子（Cl）结合率进行了研究。这对于提高混凝土结构在高氯环境中的耐久性至关重要，尤其是在它们易受氯离子侵蚀的地方，如海岸线和海洋结构。分析了Cl浓度、养护龄期以及矿物掺合料的类型和用量对SAC砂浆Cl结合率的影响。结果发现，SAC砂浆中水溶性Cl的含量随着养护龄期的增加而降低，而Cl结合率相应增加，表明其对内部Cl渗透的抵抗能力增强。添加粉煤灰（FA）和磨细粒化高炉矿渣（GGBS）可显著提高SAC砂浆的Cl结合率，当FA掺量为20%时Cl结合率提高到46.6%，GGBS掺量为40%时Cl结合率提高到38.7%。通过X射线衍射（XRD）分析进一步研究了矿物掺合料对SAC砂浆微观结构和相组成的影响。结果表明，FA和GGBS的添加促进了C-S-H（硅酸钙水化物）凝胶的形成，提高了SAC砂浆对Cl渗透的抵抗能力。另一方面，硅灰（SF）的过量添加降低了Cl结合率，而适量的石灰石粉（LP）提高了Cl结合率。对SAC砂浆Cl结合率的研究有助于评估其在实际工程中对Cl侵蚀的抵抗能力，从而指导混凝土配方的优化和耐久性的提高。

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