*2.2. Test Procedures*

Following the ASTM C109 standard procedure, 5 × 5 × 5 cm cubic specimens were used for compressive strength tests. The specimens were kept in the atmosphere and were water-cured. The compressive strength tests were conducted at different ages (7, 14, 28 days), and the average values of the four specimens were taken. The volume stability test specimens were made according to ASTM C596 standard as 2.5 × 2.5 × 28.5 cm prismatic specimens, and the length was taken as the average of 10 specimens. The test specimens for the immersion and exposure tests were 5 × 5 × 5 cm cubic specimens. The evaluation indices included specimen scale, weight and strength, and the evaluation was based on the average of five measurements. The exposure environment included natural seawater immersion, tap water immersion and atmospheric exposure. For SEM observations, the crushed specimens (about 1 × 1 × 3mm) after the compressive strength test were selected and tested according to the test procedure of ASTM C1723, and the age of the observed specimens was 56 days.
