硅藻-无定形二氧化硅对钢渣和水泥处理粘土强度和耐久性的影响

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2025-04-08 DOI:10.1016/j.sandf.2025.101613

Joyce Nakayenga , Nozomi Omaki , Daehyun Kim , Toshiro Hata

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引用次数: 0

摘要

钢渣是炼钢的副产品，由于其与粘土中的二氧化硅和氧化铝的反应性，越来越多地用于岩土工程建设。火山硅和硅藻硅对钢渣强度发展有不同的影响。由于非晶态二氧化硅和硅藻密度对钢渣处理粘土无侧限抗压强度和海水耐久性的影响尚未确定，本研究针对这一问题进行了探讨。通过在20°C下风干28天和56天的6个钢渣处理粘土样品，以及暴露在海水中0、28和90天的3个水泥或钢渣处理粘土样品，证实了这种关系。无定形二氧化硅与UCS的相关性较弱，硅藻密度与UCS的相关性较强。在硅藻密度和着火损失之间没有发现任何相关性，这意味着蓝藻是UCS降低的潜在原因。考虑到海水暴露对水泥处理粘土和钢渣处理粘土耐久性的长期影响，需要进一步的研究，因为已经发现，在水泥处理粘土中，硅藻密度较低会降低UCS，而在钢渣处理粘土中则不会。

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Influence of diatom-amorphous silica on strength and durability of steel slag and cement-treated clays

Steel slag, a by-product of steel making, is increasingly used in geotechnical construction due to its reactivity with silica and alumina in clays. Volcanic and diatom silica have various effects on the strength development of steel slag. As the effects of amorphous silica and the diatom density on the unconfined compressive strength (UCS) and seawater durability of steel slag-treated clays have not been established, this study addressed them. The relationship was confirmed using six steel slag-treated clay samples, air-dried at 20 °C for 28 and 56 days, and three cement- or steel slag-treated clay samples, exposed to seawater for 0, 28, and 90 days. The amorphous silica showed a weak correlation with the UCS, while the diatom density showed a strong relationship with it. No correlation at all was found between the diatom density and the loss on ignition, implicating cyanobacteria as the potential cause of the UCS reduction. Further research is needed to investigate the long-term effects of seawater exposure on the durability of both cement-treated and steel slag-treated clays, given that a correlation has been found between a decrease in UCS with a lower diatom density in cement-treated clays, but not in steel slag-treated clays.

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.