What is the chemical crackamite?

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Crackamite is an explosion-free demolition agent which enables a safe, soundless and tremor-free breaking up of rocks, stone and concrete without the need for special preconditions or infrastructure. It does not cause any explosion, noise, ground vibration, gas, dust or any other environmental pollution when used properly.

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Chemical mixtures that expand on setting in drilled holes to split rock

Non-explosive demolition agents are chemicals that are an alternative to explosives and gas pressure blasting products in demolition, mining, and quarrying.[1] To use non-explosive demolition agents in demolition or quarrying, holes are drilled in the base rock as they would be for use with conventional explosives. A slurry mixture of the non-explosive demolition agent and water is poured into the drill holes. Over the next few hours the slurry expands, cracking the rock in a pattern somewhat like the cracking that would occur from conventional explosives.

Non-explosive demolition agents offer many advantages including that they are silent and do not produce vibration the way a conventional explosive would. In some applications conventional explosives are more economical than non-explosive demolition agents. In many countries these are available without restriction, unlike explosives which are highly regulated.

The active ingredient is typically calcium oxide, "burnt lime," and is typically mixed with Portland cement and modifiers.

These agents are much safer than explosives, but they have to be used as directed to avoid steam explosions during the first few hours after being placed.

Typical applications / parameters Application Parameter Usage amount (kg/m3) Aperture (mm)[

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] Pitch-row (cm)[

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] Array pitch (cm)[

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] Bore depth Light Rock 30&#;45 30&#;50 30&#;50 H[

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] 8&#;10 Medium-hard Rock 30&#;45 25&#;40 20&#;35 1.05H 10&#;15 Hard Granite 35&#;45 20&#;40 20&#;30 1.05H 18&#;20 Rock Cutting 30&#;40 20&#;35 50-80 H 5&#;15 Unreinforced Concrete and Boulder Stones 35&#;50 20&#;30 25&#;35 0.9H 8&#;15 Reinforced Concrete 30&#;45 15&#;25 15&#;25 H 15&#;25

Many patents describe non-explosive demolition agents containing CaO, SiO2 and/or cement.[2]

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