Research Article
Utilization of Six Sigma in Quality Improvement of Recycled Aggregates Concrete
Table 2
Summary of the two-level preliminary DOE design.
| Levels | Impact factor | Quality of RA aggregates |
w/c | % Recycled coarse aggregate | % Recycled fine aggregate | Curing |
| High | 1 (best) | 0.5 | 25% | 25% | RH100% | Low | 2 (worst) | 0.7 | 75% | 75% | Air |
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