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Effects of primary curing and subsequent disturbances on strength development of steel slag-treated marine clay
Soils and Foundations ( IF 3.7 ) Pub Date : 2021-08-26 , DOI: 10.1016/j.sandf.2021.07.005
Arlyn Aristo Cikmit 1 , Takashi Tsuchida 2 , Kana Takeyama 3 , Ryota Hashimoto 4 , Takatoshi Noguchi 5 , Kenji Kaya 6
Affiliation  

Steel slag-treated marine clay (SSTC) is a novel geomaterial used for recycling steel slag. This article reports the effects of the primary curing (the time delay between mixing and fill work) and the subsequent disturbances (the processes of remolding, handling, and placement) on the strength development of the geomaterial. The results of a series of experiments point to the possibility of improving the initial strength of SSTC for maritime fill work. Laboratory tests were performed to investigate the changes in and the recovery of the geomaterial strength brought about by one to three days of primary curing and the subsequent disturbances during various secondary curing times. In the field tests, three embankments, using SSTC that had previously undergone one or two days of primary curing, were constructed in seawater with an actual construction machine. The test results indicated that the initial strength of SSTC previously treated with one, two, or three days of primary curing increased to approximately 14 kN/m2. The loss in strength that occurred at the primary stage of curing was recovered at a later stage of curing, namely, after 28 days, and the strength of the SSTC in the three embankments was 52–70% of the sample that was cured without primary disturbance. Larger amounts of disturbances were applied to the SSTC in the field tests than in the laboratory tests. The field tests produced submerged embankments, 1.8 m in height, with average slopes of 1:2.1–1:2.9, by undergoing one to two days of primary curing. The strength of the SSTC in all the embankments recovered significantly with time after construction, and the unconfined compressive strength of the SSTC exceeded 200 kN/m2 at 100 days, which is deemed sufficient for the construction of embankments. Overall, it was confirmed that the one-day primary curing and the sea-bottom fill method presented better results than the two-day primary curing and the sea-surface fill method, considering the gradient of the slope and the strength-recovery characteristics of the SSTC.



中文翻译:

初熟及后续扰动对钢渣处理海相粘土强度发展的影响

钢渣处理海洋粘土(SSTC)是一种用于回收钢渣的新型土工材料。本文报告了初步固化(混合和填充工作之间的时间延迟)和随后的干扰(重塑、处理和放置过程)对土工材料强度发展的影响。一系列实验的结果表明,有可能提高 SSTC 用于海上填充工作的初始强度。进行了实验室测试,以研究由 1 至 3 天的一次养护和随后的各种二次养护期间的扰动引起的土工材料强度的变化和恢复。在现场测试中,三个路堤,使用之前经过一两天初步固化的 SSTC,是用实际的建筑机械在海水中建造的。测试结果表明,经过 1、2 或 3 天一次固化处理的 SSTC 的初始强度增加到约 14 kN/m2 . 在养护初期发生的强度损失在养护后期即 28 天后恢复,三个路堤中 SSTC 的强度为未经初养护的样品的 52-70%。骚乱。与实验室测试相比,在现场测试中对 SSTC 施加了更多的干扰。现场测试通过一到两天的初步养护产生了高 1.8 m、平均坡度为 1:2.1-1:2.9 的水下路堤。施工后所有路堤SSTC强度均随时间显着恢复,SSTC无侧限抗压强度超过200 kN/m 2在 100 天,这被认为足以建造堤防。综合考虑坡度坡度和强度恢复特性,证实一日一次养护和海底填埋法的效果优于两天一次养护和海面填埋法。 SSTC。

更新日期:2021-09-30
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