Magnesium oxychloride cement (MOC) pastes incorporating supplementary cementitious materials (SCMs) including pulverized fuel ash (PFA) and incinerated sewage sludge ash (ISSA) were examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with energy dispersive X-ray spectrometry (EDX). The result showed that the mechanism of PFA and ISSA in improving the water resistance of MOC paste is similar, even though the molar ratios of the hydration product in the ISSA-incorporated paste and the PFA-incorporated paste were different. The active phases in PFA or ISSA could react with MgO and produce an amorphous phase (amorphous magnesium aluminosilicate gel), which was interspersed with Phase 5 and changed the morphology of Phase 5 to fibroid or lath-like phases. These fibroid or lath-like phases interlocked with each other and also connected with the amorphous phase in the matrix to form a stable compact structure. Therefore, the water resistance of MOC was improved. The ISSA-blended MOC paste had higher water resistance compared to the PFA-blended MOC, which may be due to the different chemical composition of amorphous phase and the dissolved phosphorus from ISSA.

通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）和能量色散X-射线检查了掺入辅助胶结材料（SCM）的三氯氧化镁水泥（MOC）浆料，其中包括粉煤灰（PFA）和焚化的污水污泥灰（ISSA）射线光谱法（EDX）。结果表明，即使掺入ISSA的糊剂和掺入PFA的糊剂中水合产物的摩尔比不同，PFA和ISSA改善MOC糊剂的耐水性的机理也相似。PFA或ISSA中的活性相可以与MgO反应，生成无定形相（无定形硅铝酸镁凝胶），其间散布着第5相，并将第5相的形态改变为肌瘤或板条状相。这些肌瘤或板条状相彼此互锁，并且还与基质中的非晶相连接以形成稳定的致密结构。因此，提高了MOC的耐水性。与PFA混合的MOC相比，ISSA混合的MOC浆料具有更高的耐水性，这可能是由于非晶相和来自ISSA的溶解磷的化学组成不同所致。