Table 8 Statistical analysis of acid attack.
Descriptive statistics | Cement | Nano silica content | Fly ash | Na2SO4 | NCA | RCA | FA | Water | Ad | Days | Reduction in compressive strength |
|---|---|---|---|---|---|---|---|---|---|---|---|
Mean | 426.25 | 8.25 | 123.75 | 8.8 | 495 | 405 | 800 | 180 | 12 | 2.5 | 24.05 |
Standard error | 10.37756 | 0 | 10.37756 | 0.495039 | 40.50316 | 40.50316 | 0 | 0 | 0 | 0.125789 | 0.84 |
Median | 426.25 | 8.25 | 123.75 | 11 | 450 | 450 | 800 | 180 | 12 | 2.5 | 24.59 |
Mode | 550 | 8.25 | 0 | 11 | 900 | 0 | 800 | 180 | 12 | 1 | -- |
Standard deviation | 92.81975 | 0 | 92.81975 | 4.427761 | 362.2713 | 362.2713 | 0 | 0 | 0 | 1.125088 | 7.60 |
Sample variance | 8615.506 | 0 | 8615.506 | 19.60506 | 131240.5 | 131240.5 | 0 | 0 | 0 | 1.265823 | 57.79 |
Range | 247.5 | 0 | 247.5 | 11 | 900 | 900 | 0 | 0 | 0 | 3 | 29.86 |
Minimum | 302.5 | 8.25 | 0 | 0 | 0 | 0 | 800 | 180 | 12 | 1 | 8.38 |
Maximum | 550 | 8.25 | 247.5 | 11 | 900 | 900 | 800 | 180 | 12 | 4 | 38.25 |
Sum | 34,100 | 660 | 9900 | 704 | 39,600 | 32,400 | 64,000 | 14,400 | 960 | 200 | 1924.34 |
Count | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 |
