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Micro- and meso-structural changes on electrically cured ultra-high performance fiber-reinforced concrete with dispersed carbon nanotubes
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.cemconres.2020.106214
Myungjun Jung , Ji-seul Park , Sung-Gul Hong , Juhyuk Moon

Abstract This study investigated the potential application of electrical curing method on ultra-high performance fiber-reinforced concrete (UHPFRC) by incorporating carbon nanotubes (CNTs) and resulting structural changes in micro- and meso-scale. The addition of CNTs significantly decreased the electrical resistance of the UHPFRC, and the temperature inside the UHPFRC was able to increase to 90 °C under low voltage by the Joule effect. This enabled electrical curing, which can produce a similar effect to steam curing but in a much more energetically efficient way. The added CNTs slightly hindered the hydration reaction of the UHPFRC, but it modified the formation of C-(A)-S-H to be denser, stiffer, and more complex which have been evidenced by observed partial cross-linking in the C-(A)-S-H and the higher fractal dimension of solid system. The results of this study are promising for using UHPFRC in on-site field condition and extending the application of CNTs in structural materials.

中文翻译:

具有分散碳纳米管的电固化超高性能纤维增强混凝土的微观和细观结构变化

摘要 本研究通过掺入碳纳米管 (CNT) 以及由此产生的微观和中观结构变化,研究了电固化方法在超高性能纤维增强混凝土 (UHPFRC) 上的潜在应用。碳纳米管的加入显着降低了 UHPFRC 的电阻,通过焦耳效应,UHPFRC 内部的温度能够在低电压下升至 90°C。这实现了电固化,它可以产生与蒸汽固化类似的效果,但以一种更节能的方式。添加的碳纳米管稍微阻碍了 UHPFRC 的水合反应,但它改变了 C-(A)-SH 的形成,使其更致密、更坚硬、更复杂,这已通过观察到的 C-(A)-SH 中的部分交联得到证明。 )-SH 和固体系统的较高分形维数。
更新日期:2020-11-01
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