To investigate the effects of water-to-cement ratio (w/c) and silica fume addition on the decrease of the Young's modulus due to leaching, six cement pastes were simulated: three w/c ratios (0.5, 0.4, 0.25) for two industrial cements, ordinary portland cement (CEM I) and blended portland cement with 7.7 % silica fume content (CEM II/A). Cement CEMII/A is made by adding silica fume at the cement plant to CEM I as a mass replacement for CEM I. So therefore the "c" in "w/c" represents the weight of the cement CEM II, a mixture of Portland cement and silica fume. These cement pastes were previously studied by (Kamali 2003). Their formulations are given in Table 4.
| Table 4. Composition of the six cement pastes. | |||
|---|---|---|---|
| Paste nº | Cement type | w/c | Silica fume content % |
| 1 | Portland (CEM I) | 0.5 | 0 % |
| 2 | Portland (CEM I) | 0.4 | 0 % |
| 3 | Portland (CEM I) | 0.25 | 0 % |
| 4 | CEM II/A | 0.5 | 7.7 % |
| 5 | CEM II/A | 0.4 | 7.7 % |
| 6 | CEM II/A | 0.25 | 7.7 % |
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