Hydration Characteristics of Slag-Ca(OH)2-Al2O3 Binder in a 60 °C Curing Environment with Brine as Mixing Water

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-06-24 DOI:10.1186/s40069-024-00675-y
Choonghyun Kang, Taewan Kim, Yong-Myung Park, Ki-Young Seo
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Abstract

Recently, research results on PC-based or alkali-activated slag cement (AASC) using seawater as mixing water have been reported. Unlike seawater, reverse osmosis brine (brine) is waste discharged into the ocean from seawater desalination plants. There is a need to develop new and effective methods of disposing or utilizing brine to reduce marine pollution, protect marine ecosystems, and increase marine plant construction. However, research on cement or concrete using brine as a mixing water is very limited. Brine has almost the same composition as seawater, and the ion concentration is 2–4 times higher. Therefore, it is believed that new methods of using brine can be investigated and developed based on existing research and experimental results on seawater. The effects of brine and aluminum oxide (AO) on activated slag with calcium hydroxide (CH) were investigated for hydration and mechanical properties. 5% and 10% of CH were used, and samples using fresh water (FC) were prepared at the same time for comparison with brine. The slag sample without CH has a low initial (1 and 3d) strength of about 10 MPa for both FC and brine, but increases rapidly from 7d. Incorporation of CH was effective in improving the mechanical performance of FC and brine samples. In addition, the brine sample exhibited higher strength than the FC sample because it formed fewer C3AH6 phases that cause volume instability than the FC sample and affected the hydration promotion of slag particles. And more calcite phases were observed in the brine samples than in the FC samples. Through this study, the possibility of using brine as a building material was confirmed. In addition, the effect of chloride ion adsorption of slag mixed with AO and CH on the physical properties and mechanical performance of the hydration reaction was confirmed.

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以盐水为混合水的矿渣-Ca(OH)2-Al2O3 粘合剂在 60 °C 固化环境中的水化特性
最近,有关使用海水作为混合水的 PC 型或碱活性矿渣水泥(AASC)的研究成果有所报道。与海水不同,反渗透盐水(盐水)是海水淡化厂排入海洋的废物。有必要开发新的有效方法来处理或利用盐水,以减少海洋污染,保护海洋生态系统,并增加海洋工厂的建设。然而,有关使用盐水作为混合水的水泥或混凝土的研究非常有限。盐水的成分与海水几乎相同,离子浓度却高出 2-4 倍。因此,我们认为可以在现有研究和海水实验结果的基础上,研究和开发使用盐水的新方法。研究了盐水和氧化铝(AO)对氢氧化钙(CH)活性渣水化和机械性能的影响。使用了 5% 和 10% 的 CH,同时制备了使用淡水 (FC) 的样品,以便与盐水进行比较。对于 FC 和盐水,不含 CH 的炉渣样品初始(1 和 3d)强度较低,约为 10 兆帕,但从 7d 开始强度迅速增加。加入 CH 能有效改善 FC 和盐水样品的机械性能。此外,盐水样品的强度高于 FC 样品,这是因为盐水样品形成的 C3AH6 相比 FC 样品少,而 C3AH6 相会导致体积不稳定,影响熔渣颗粒的水化促进作用。盐水样品中的方解石相也比 FC 样品中的多。通过这项研究,证实了将盐水用作建筑材料的可能性。此外,还证实了 AO 和 CH 混合矿渣的氯离子吸附对水化反应的物理性质和机械性能的影响。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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