Test Group

Clay Content (%)

pH Values

Number of Specimens

1

−10

4, 5, 6, 7, 8, 9, 10

28

2

0

4, 5, 6, 7, 8, 9, 10

28

3

10

4, 5, 6, 7, 8, 9, 10

28

4

20

4, 5, 6, 7, 8, 9, 10

28