Crackem - Drilling Chemicals - MobiDrill

RECOMMENDED TREATMENT
Drilling machines: Use electrical drill, rock drill or crawler mounted drill machine.

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Drilling Direction: It is preferable to drill holes vertically; however in the case of a wall or pillar where vertical drilling is difficult an inclined hole may be drilled. A greater effect is achieved with a deeper hole.

Hole Diameter and Hole Spacing: The breaking plan of the hole design sections should serve as a guideline in making the best decision. In general the preferable hole diameter is 36mm up to 70mm. The holes should not be spaced more than 40cm apart with 36mm diameter holes. The bigger the diameter of the bore the wider the spacing can be between holes. Hole depth should be a drilled to a depth of 80 – 90 % of material (minimum of 70 % of the material’s depth).

Hole Pattern: Holes must be drilled to allow a free face for the Crackem to push towards. To demolish a slab without pushing out the walls which surround it, drill a cone shaped pattern at the centre and fill these holes first. The cone will pop upwards and create a free face. Hole pattern also depends on how fast you need results. More holes spaced closer together will give faster cracking time and smaller pieces. Boulders are much easier to break than reinforced concrete, and drill holes can be spaced further apart, especially if breaking speed is not critical.

Empty holes can also be used to direct cracks: they cost less than filled holes. This will save money compared to filling all the holes, but will slow down the breaking time.

Mixing: Crackem is a powder that must be thoroughly mixed with cool clean water in a ratio of 30 % of the overall weight.

How much concrete can I demolish with a box of Dexpan?

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A standard 44lb. box will cover approximately 35 lineal feet of drilled holes, which can be used in a standard pattern to remove 60 cubic feet, or 1.7 cubic meters, of concrete. A 11lb. bucket will cover approximately 9 lineal feet, or ~16 cubic feet (.45 cubic meters). Dexpan is recommended for projects with a depth of at least 8 inches.

Which Dexpan should I use?

Use the ambient temperature of the area surrounding the rock and compare it to the temperatures listed on each type of Dexpan. A local weather forecast should be enough to determine the appropriate type of Dexpan. For Temperatures between 77-104° F (25-40° C), use Dexpan #1. From 50-77° F (10-25° C), use #2. And for 23-50° F (5-10° C), use #3.

When should I pour Dexpan?

The best time to pour Dexpan is the morning after you drill the holes, immediately after combining the product with water. Doing this as early as possible will allow Dexpan to work throughout the day.

Dexpan pushed itself out of its hole! What went wrong?

We refer to Dexpan pushing itself out of the drilled hole as a 'blowout', and it can occur for a few reasons. The most common is when the project does not have adequate expansion space. Be sure that there is an empty area next to the rock at least as long as the depth of the drilled holes so that Dexpan has somewhere to push the rock. Blowouts may also occur due to high temperatures (especially when using the wrong Type of Dexpan), large hole diameters, and using Core Bits to drill holes.

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