2.2.4. Water Retention Characteristics Test

The saturated specimens were dried and wetted at constant humidity and temperature. The suction was intermittently measured using a WP4C dew point water potential meter (Figure 5). The test specimen's initial size was *d*<sup>0</sup> = 33 mm and *h*<sup>0</sup> = 7 mm.

**Figure 5.** WP4C dewpoint potential meter.
