Table 6.
Cube compressive strength of coal gangue ceramsite coarse aggregate concrete.
| Series | W/C | Cube crushing strength (MPa)/Coefficient of concrete age (%) | ||||
|---|---|---|---|---|---|---|
| 3d | 7d | 14d | 21d | 28d | ||
| A | 0.55 | 17.81/55.97 | 23.05/72.33 | 27.35/85.85 | 29.60/93.08 | 31.82/100 |
| B | 0.45 | 24.92/57.51 | 35.34/81.52 | 38.44/88.68 | 41.92/96.77 | 43.33/100 |
| C | 0.35 | 29.54/58.42 | 42.52/84.16 | 46.73/92.48 | 49.73/98.42 | 50.53/100 |
| D | 0.30 | 29.33/60.04 | 41.43/84.84 | 45.72/93.65 | 47.45/97.13 | 48.82/100 |
(1) Each strength is the average value of three test specimens.
(2) The coefficient of concrete age is the ratio of the compressive strength of concrete at different ages to that at 28 days.