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HOW DOES CRACKAMITE WORK?
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How Does Crackamite® Work?

When Crackamite is mixed with an appropriate quantity of water and poured into cylindrical holes drilled in rock or concrete, it hardens and creates an amazing expansive pressure of 11 MT/m2. Crackamite cracks the matter to be demolished which then can be easily removed with a pick breaker, pneumatic breaker, excavator, etc.

Crackamite develops a very high expansive capability at a consistent volume exceeding 122 Mpa (11,200 T/m2) more than enough to break up any materials to be cut or demolished. The tensile strength for most rock is less than 5 - 25 Mpa (500 - 2500 T/m2  50 - 250 kg/cm2) while reinforced concrete breaks at 3 - 5 Mp (30 - 50 kg/cm2, 300 - 500 T/m2).

Fracture Mechanism of Crackamite®

After Crackamite is poured into holes drilled in rocks or concrete, the expansive stress gradually increases with time, and reaches to more than 11,000 T/m2 at room temperature after 24 hours. As Crackamite generates its expansive stress, the material to be cracked undergoes a process of (1) crack initiation, (2) crack propagation, (3) the increase of crack width. Therefore, this fracture mechanism is distinguished from a breakage by blasting.

The mechanism by the expansive stress of Crackamite is shown in Fig. 1. Cracks initiate from an inner surface of the hole, being caused by tensile stress at a right angle with the compressive stress that occurs by the expansive stress of Crackamite. The expansive stress of Crackamite continues even after the appearance of cracks, the cracks propagate and also new cracks initiate during the process. Usually, for a single hole, 2 - 4 cracks initiate and propagate. When a free surface exists, the crack, as shown in Fig. 2, is pushed apart mainly by the shear stress, and a secondary crack also arises from the bottom of the hole running toward the free surface.


Fig. 1 - Fracture mechanism by the expansive stress of Crackamite


Fig. 2 - Sectional-view of the crack formation in the material with two free surfaces

When multiple numbers of holes are filled with Crackamite, that are properly adjacent to each other, the cracks from the hole propagate to connect with the neighboring holes, as shown in Fig. 3. It is therefore possible to determine the directions of the cracks as planned by appropriately arranging the hole spacing and its depth and its inclination.


Fig. 3 - Crack propagation

Establishment of free surface:

In the case of trenching, shafting or tunneling, if all holes are drilled vertically and filled with Crackamite, the crack width cannot increase but horizontal cracks initiate. Therefore, in order to obtain two free surfaces, inclined holes or pre-splitting must be required.

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CRACKAMITE. Learn more about Non-Explosive Demolition Agents Non-Explosive Demotion Agents are highly expansive powder compositions for stone breaking, granite and marble quarrying, concrete cutting and demolition. Non-Explosive Demotion Agents are safe, environment friendly and a good and viable alternative to explosives and other traditional methods of quarrying and demolition. CRACKAMITE Non-Explosive Demotion Agents are mixed with clean water and poured into pre-drilled holes on rock and concrete. The diluted CRACKAMITE Non-Explosive Demotion Agent swells and exerts significant expansive thrust on the hole-wall.

After a certain period, the pressure induced by the Non-Explosive Demotion Agent fractures the wall and splits the rock across the line of the drill holes. Non-Explosive Demotion Agents thus very easily split and fracture mass rock without producing any noise, vibration, toxic gases or flying debris. CRACKAMITE Non-Explosive Demotion Agents are getting increasingly popular in quarrying and demolishing applications. Non-Explosive Demotion Agents can be used in a wide range of applications for safe demolition, concrete cutting, rock breaking and marble & granite quarrying. Non-Explosive Demotion Agents are particularly used for breaking, cutting or demolishing marble, granite and other natural stones, concrete and reinforced concrete.

CRACKAMITE Non-Explosive Demotion Agents are ideal for use in situations where surrounding buildings or other structures would be damaged by flying debris or vibration. Non-Explosive Demolition, Controlled Breaking, Cutting and Cracking. Safe, Easy to use, Cost Effective and Non License Needed. Da-mite Rock Splitting Mortar. OTHER SCA TERMINOLOGY REFERENCE - Non-explosive Demolition Agent, Non-explosive Cracking Agent, Soundless (Silent, Noiseless) Cracking Agent (SCA), Expansive Demolition Agent, Expansive Agent, Expansive Mortar, Expansive Cracking Agent, Expansive Cement, Expansive Concrete, Chemical Rock Splitting Agent (CRSA). Cracking Design Reference Chart.

CRACKAMITE Crackamite can be used on any type of stone formation, concrete, reinforced concrete or tiled structure in Quarrying and stone cutting, removing boulders, Excavating foundations, Leveling stones for road works, Excavating trenches for pipe-laying, Underground excavations, Demolition of concrete or reinforced concrete objects, Demolition of foundations, Demolition of breakwaters or jetties, Demolition of tiled and refractory structures, and more. Crackamite is a non-toxic powder consisting of calcimined oxides of calcium, silicon and aluminum.

Crackamite is a soundless, non-explosive and safe demolition agent which is quite different from ordinary demolition agents such as explosives and dangerous materials. It does not cause any fly rock, noise, ground vibration, gas, dust or any other environmental pollution when used properly. Eliminates noise, fly rock and vibration potential caused by blasting or heavy mechanical means. Increases productivity of mechanical demolition equipment. CRACKAMITE Controls cracking.

Minimizes risk in high exposure situations such as rock or concrete excavation adjacent to hot rail lines or near sensitive fiber optic cables or controls. Works underwater in difficult conditions. Saves time in shutdown conditions. Eases removal where impact force is limited by specifications. Makes removal in confined spaces easier. Accelerates removal time once fracturing occurs. CRACKAMITE Requires no licensing or storage security. Non-Explosive Demolition, Controlled Breaking, Cutting and Cracking. Safe, Easy to use, Cost Effective and Non License Needed.

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