Specimen Number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Means |
(pre-test) (HB) | 38 | 32 | 41 | 39 | 35 | 37 | 37 | 35 | 38 | 40 | 37.2 |
(post-test) (HB) | 40 | 36 | 47 | 47 | 42 | 45 | 47 | 36 | 48 | 52 | 44 |
Hardness change (HB) | 2 | 4 | 6 | 8 | 7 | 8 | 10 | 1 | 10 | 12 | 6.8 |
Change% | 5.26 | 12.50 | 14.63 | 20.51 | 20 | 21.62 | 27.03 | 2.86 | 26.32 | 30 | 18.28 |