Specimen Number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Means |
(pre-test) (HB) | 64 | 53 | 38 | 58 | 55 | 51 | 55 | 46 | 56 | 56 | 51.1 |
(post-test) (HB) | 87 | 57 | 54 | 56 | 65 | 57 | 67 | 51 | 47 | 65 | 60.6 |
Hardness change (HB) | 23 | 4 | 16 | −2 | 10 | 6 | 12 | 5 | −12 | 9 | 9.5 |
Change% | 35.94 | 7.55 | 42.11 | −3.45 | 18.18 | 11.76 | 21.82 | 10.87 | −34.29 | 16.07 | 18.59 |