Table 1 29Si chemical shifts and integrated area (%) of the Qn species present in C-S-H samples before and after carbonation
C-S-H | Q4 | Q3 | Q2 | |||
|---|---|---|---|---|---|---|
-110.3 ppm | -98.8 ppm | -89.7 ppm | −93.5 ppm | −85.1 ppm | ||
Before Carbonation | 0% | 0% | 0% | 10.5% | 89.5% | |
After Carbonation | pH 9 | 58.2% | 35.9% | 5.9% | 0% | 0% |
pH 13 | 53.8% | 39.3% | 6.9% | 0% | 0% | |
