|
ROCKITE |
|
TEST OF VARIOUS METHODS OF HOLDING ANCHOR BOLTS IN CONCRETE - TENSILE RESULTS
Procedure: 3/8-16 x 10 Square Head Bolts (10.1/2" long including head) were anchored in 8" x 8" block of 3600 psi. concrete. All holes 3/4" dia. x 4" deep. Anchoring media used were allowed to harden for 30 minutes at room temperature before stressing in Riehle Universal Testing Machine.
Results:
| Medium | Mark | Exposed Bolt Length - Inches | Bolt Grip Including Head | Max. Load (lbs.) | Break |
| Sulphur | 1B | 7-1/8 | 3-3/8 | 6920 | In block |
| Sulphur | 2B | 7-3/16 | 3-5/16 | 6080 | In block |
| Sulphur | 3B | 7-1/16 | 3-7/16 | 7680 | In block |
| Lead | 4C | 7 | 3-1/2 | 6340 | In block |
| Lead | 5C | 7-1/4 | 3-1/4 | 6200 | In block |
| ROCKITE | 7A | 7 | 3-1/2 | 8820 | In bolt |
| ROCKITE | 8A | 7 | 3-1/2 | 8210 | In bolt |
Failure of the fastenings made with both lead and sulphur took place when the concrete blocks, in which the anchor bolts were fastened, fractured at strains of 6080 to 7680 lbs., leaving the anchoring medium free to pull out of the opening.
In the case of ROCKITE, no failure took place in the fastening up to strains of 8210 to 8820 lbs. at which point the anchor bolts broke.
Conclusion: In the case of the lead and sulphur inserts, it appears obvious that the longitudinal stress caused changes in the lateral dimensions, resulting in combined stresses sufficient to fracture the walls of the concrete blocks surrounding the settings.
In the case of ROCKITE, less dimensional change took place in the setting, which was still intact where the anchor bolts broke.
These tests indicate that the holding power of ROCKITE is superior to that of lead and sulphur for fastening bolts in concrete.
-----------------------------
TABLE FOR ESTIMATING QUANTITIES REQUIRED
-----------------------------
