熔渣(焊接)
材料科学
碱金属
同种类的
耐久性
冶金
水滑石
矿物学
板条
复合材料
地质学
微观结构
化学
马氏体
催化作用
有机化学
物理
热力学
生物化学
作者
Shouxin Zhang,Shizhe Zhang,Chen Liu,Oğuzhan Çopuroğlu
标识
DOI:10.1016/j.cemconres.2023.107409
摘要
In this paper, the authors characterized two types of zonation within slag rims in aged alkali-activated slag (AAS) systems through SEM and TEM technology. These two elemental zonation were closely related to the pore structure of AAS pastes, thus providing strong implication for the transport- and durability-related performance of AAS systems. The first type of zonation occurred in the rims of AAS specimens under sealed curing. It was found that lath-like hydrotalcite-like phase accumulated near the boundary while a generally homogeneous and foil-like C-(N-)A-S-H gel phases precipitated in the following sub-zone. When slag rims were thick enough, a new Mg-rich region occurred. The second type of zonation was noticed in the carbonated AAS pastes. For this kind of distribution pattern, C-(N-)A-S-H gel phases were observed near the boundary. Following, the accumulation of Mg and Ca occurred alternatively. Additionally, transformation mechanism between these two types of zonation was also proposed.
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