《Table 6 Composition of the Yellow River-slag composite material sample at the position“A”in Fig.9》下

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《Properties of Alkali-activated Yellow River Sediment-slag Composite Material》

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Fig.9 shows the SEM images of slag and Yellow River sediment-slag composite material.Firstly，it can be found that slag is mainly glassy and amorphous particle，and there is little impurity in it.Secondly，Fig.9（b）shows that the gaps of sediment particles are filled by some white substances.Furthermore，Fig.9（c）shows clearly that the white substance fills the gaps between particles and wraps the sediment particles densely.This gelatinous substance combines sediment particles to be stable and solid block，which contributes to reduce micro-cracks in the specimens so that to enhance the strength.According to the above analysis，the white substance may be the C-S-H gel mainly generated by the slag under the alkali condition.Fig.9 is SEM micrographs of alkali-activated Yellow River sediment-slag composite material with 10 wt%Ca（OH）2.Although there are some cracks and holes in the interior structure，the sample is relatively more compacted than before.The gel generated by alkaliactivated process has an important role on filling holes and enhancing the strength of the composite material.In order to determine mineral composition of the new products，we focus on the positions among the sediment particles and the EDS has been used to analyze the composition of position“A”in Fig.9.The EDS result is shown in Table 6，which shows the scanned position mainly contains elements of carbon，oxygen，magnesium，aluminum，silicon，calcium and iron.Moreover，the weight percentage of carbon is16.33%and atomic percent of it is 23.76%，which can confirm that CaCO3 is the main mineral.In addition，the weight percentage of Si and Ca elements are relatively high，which can confirm that C-S-H gel is another main substance in the composite material.That also corroborates the analysis results of abovementioned X-ray diffraction patterns and fourier transform infrared spectrograms.The results show that the amount of C-S-H gel is small，which may be due to the facts that dosage of slag is small as well as the C-S-H gel could be carbonated by the CO2 in the air.