Table 3 Porosity and compressive cylinder strength of pervious concrete.
Mix | Age (days) | Porosity range (%) | 28-Day strength f28 range (MPa) | Mean porosity (%) | Mean 28-day strength (MPa) | Strength ratio (f28/f7) |
|---|---|---|---|---|---|---|
NA20 | 7 | 30.9–36.7 | 6.16–8.53 | 42.1 | 7.41 | 1.00 |
28 | 33.3–36.1 | 6.69–7.79 | 34.3 | 7.41 | 1.00 | |
NA13 | 7 | 25.5–29.3 | 11.1–13.1 | 27.7 | 11.8 | 1.00 |
28 | 26.8–28.1 | 12.0–15.8 | 27.5 | 13.9 | 1.18 | |
RA20 | 7 | 23.5–25.4 | 6.03–6.80 | 27.7 | 6.47 | 1.00 |
28 | 24.6–28.8 | 4.48–6.96 | 27.5 | 6.06 | 0.94 | |
RA13 | 7 | 13.8–16.1 | 6.42–12.1 | 14.4 | 11.1 | 1.00 |
28 | 7.0–13.2 | 10.4–13.3 | 9.87 | 12.1 | 1.09 | |
RA13S35 | 7 | 22.1–27.0 | 4.99–6.81 | 24.4 | 5.79 | 1.00 |
28 | 22.8–28.4 | 5.09–7.00 | 25.5 | 6.19 | 1.07 | |
RA13S70 | 7 | 13.7–16.0 | 8.55–10.8 | 15.0 | 10.0 | 1.00 |
28 | 13.9–19.7 | 10.2–11.1 | 16.7 | 10.6 | 1.06 |