Division 04 · rockfrac.com
RockFrac® Non-Explosive Demolition Agent (11,200+ PSI)
Restored & Upgraded from Legacy calculator.php
RockFrac® Borehole & Carton Estimator
Empirical Charge Factor by Material Class
| Application | Hole Dia | Spacing | Depth | Charge Factor |
|---|---|---|---|---|
| Boulders & Secondary Rock Breaking | 30 - 40 mm (up to 50 mm) | 10 times hole diameter (approx. 35 - 50 cm / 14 - 20 in) in an offset staggered pattern | 70% to 90% of total boulder thickness | 5 - 10 kg/m3 (approx. 8 - 10 kg/m2) |
| Virgin Ledge Rock & Trench Bench Excavation | 35 - 50 mm (soft rock) to 35 - 65 mm (hard rock) | 20 - 40 cm for cutting; 40 - 60 cm for mass breaking, oriented along relief planes with free face | 100% to 110% of bench height (drill 10% deeper than planned final grade) | 10 - 15 kg/m2 (Middle/Hard stone: quartzite, granite) |
| Unreinforced Concrete Foundations & Mass Piers | 35 - 50 mm | 40 - 60 cm (approx. 16 - 24 in) in square or staggered rows with free boundary relief | 80% of total foundation thickness | 8 - 15 kg/m2 |
| Heavily Reinforced Concrete Structures | 35 - 50 mm | 15 - 30 cm (approx. 6 - 12 in) dense grid to strip concrete cover and debond rebar | 90% of total structural member thickness | 15 - 25 kg/m2 |
| Dimension Stone Quarrying & Slab Trimming | 30 - 40 mm | 20 - 40 cm linearly aligned along split line (more economical than wire sawing) | 105% to 110% of block thickness (H + 5%H to 110%H) | 5 - 15 kg/m2 |
| Hole Diameter (in / mm) | Drill Ft per 5kg Bag | Metric (kg/m) | US (lbs/ft) | Soft Rock Spacing | Med Rock / Concrete | Hard Granite / Rebar |
|---|---|---|---|---|---|---|
| 1.375 in (1-3/8 in) (35 mm) | 11.0 ft | 1.64 | 1.10 | 16 to 24 in (40 to 60 cm) | 16 to 24 in (40 to 60 cm) | 6 to 12 in (15 to 30 cm) |
| 1.500 in (1-1/2 in) (38 mm) | 8.5 ft | 1.94 | 1.30 | 16 to 24 in (40 to 60 cm) | 16 to 24 in (40 to 60 cm) | 6 to 12 in (15 to 30 cm) |
| 1.625 in (1-5/8 in) (42 mm) | 7.2 ft | 2.26 | 1.52 | 16 to 24 in (40 to 60 cm) | 16 to 24 in (40 to 60 cm) | 6 to 12 in (15 to 30 cm) |
| 1.750 in (1-3/4 in) (45 mm) | 6.2 ft | 2.66 | 1.79 | 16 to 24 in (40 to 60 cm) | 16 to 24 in (40 to 60 cm) | 6 to 12 in (15 to 30 cm) |
| 2.000 in (2 in) (51 mm) | 4.79 ft | 3.41 | 2.29 | 16 to 24 in (40 to 60 cm) | 16 to 24 in (40 to 60 cm) | 6 to 12 in (15 to 30 cm) |