Delay Filling
Fill in (1) holes then (2) holes after delaying (Refer to Figures 1, 2, and 3)) This can be applied for controlling of a crack direction (See Bellow).
Figure 1: Splitting of Large Boulder
| d | 32-35 mm | 44-51 mm |
| 1 1/4″ - 1 3/8″ | 1 3/4″ - 2″ | |
| L | 30-40 cm | 60-90 cm |
| 1′ - 1′4″ | 2′ - 3′ | |
| D | 70% of Height | |
Reliever holes are necessary when trench is deep
Figure 2:
Trenching and tunneling of Rock
| d | 38 - 51mm |
| 1 1/2″ - 2″ | |
| L | 30-60 cm |
| 1′ - 2′ | |
| D | 1 - 1.8m |
| 3′ - 6′ | |
| 45° - 60° |
Repeat the same procedure for deeper case
Figure 3: Mass Concrete
| Concrete | Reinforced Concrete | |
| d | 38 - 51 mm | 38 - 44 mm |
| 1 1/2″ - 2″ | 1 1/2″ - 1 3/4″ | |
| L | 50 - 90 cm | 40 - 60 cm |
| 1′8″ - 3′ | 1′4″ - 2′ |
