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What is Non-Explosive Demolition Agent?
Sep 23, 2018

What is Non-Explosive Demolition Agent?

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     (1)Non-Explosive Demolition Agent is not a dangerous item.

Therefore, in the purchase, transportation, storage, use, without any restrictions

(2) Construction process is safe.

There are no hazards of vibration, air shock waves, flying stones, noise, toxic gases and dust generated when explosives are blasted.

(3) Simple construction.

Non-Explosive Demolition Agent can be poured into the blasthole after mixing with water, without clogging; no professional work is required.

(4) If it needs to be broken, it will be broken.

According to the requirements, the appropriate parameters can be designed to achieve the purpose of splitting and cutting rock and concrete in a planned manner.

The static crushing method (static blasting technology) is a new method of crushing (or cutting) rock and concrete developed in recent years, also known as static forced cracking and static crushing technology.

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1, The Principle

An inorganic salt powdered static breaker containing elements such as molybdenum, magnesium, calcium, titanium, etc., is adjusted into a fluid slurry with an appropriate amount of water, directly poured into a borehole, and the crystal is deformed by hydration reaction, with time The growth produces a large expansion pressure (radial compressive stress and hoop tensile stress), which is applied slowly and quietly to the wall of the hole, reaching a maximum after a period of time, causing the concrete or rock to burst and break.

Since the rock or concrete which is generally disintegrated is a brittle material, the brittle material has a large compressive strength and a small tensile strength, and its tensile strength is much smaller than the compressive strength. The tensile strength of rock is 4 -10Mpa, the tensile strength of concrete is about 1.5 - 3.0Mpa, which is about 1/10 - 1/20 of its compressive strength. The expansion pressure of static cracking agent is usually 30 - 50Mpa. Therefore, a reasonable crushing design (determination of charge, pore size, pore depth, and pore spacing) is sufficient to adequately damage the medium surrounding the orifice. As long as the constraint continues to exist, the breaker has the property of continuously producing or retaining a certain degree of expansion pressure, and thus can continue to increase or create new cracks.

It has been determined that at a temperature of 20 ° C and a water to crushing agent ratio of 0.3:1, the volume will expand freely four times.


2, The Scope of Application

(1) Demolition and removal of concrete and masonry structures;

(2) Breaking or cutting of various rocks.

Or for secondary crushing. However, it does not apply to porous bodies and high-rise structures.

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3. Advantages: (Safe and Convenient)

(1) The breaker is not a dangerous item.

Therefore, there are no restrictions on purchase, transportation, storage, and use.

(2) Construction Process is safe.

There are no hazards of vibration, air shock waves, flying stones, noise, toxic gases and dust generated when explosives are blasted.

(3) Simple Construction.

The crushing agent can be poured into the blasthole after mixing with water, without clogging; no professional work is required.

(4) If it needs to be broken, it will be broken.

According to the requirements, the appropriate parameters can be designed to achieve the purpose of splitting and cutting rock and concrete in a planned manner.

However, the range of use of static breakers has certain limitations. Compared with explosives, energy is not as large as explosives, and there are many holes. The crushing effect is greatly affected by temperature and construction personnel experience. Its superiority is revealed in an environment where blasting methods are not allowed.


4. History of Non-Explosive Demolition Agent

In 1968, Hideki Tanaka of the Dacheng Construction Technology Research Institute of Japan applied for a patent on the topic of “Crushing Method for Concrete Structures”. The main content of the results was: mixing CaO or MgO with water and filling it into the blasthole. The body hydration reaction causes volume expansion to create pressure and damage the building. This is the earliest static breaker. In the future, Japan's Ono, Sumitomo, etc. also made a lot of experimental research and succeeded. At present, there are at least five types of static crushing agents commercially available on the Japanese market, and the applicable temperature is between -5 ° C and 35 ° C.

Since the beginning of the 1980s, it has also been successfully developed. However, due to market, raw materials, technology, and system, the product of static breakers has not been further developed. In the past two years, with the restrictions on the use of explosives and environmental protection requirements, static breakers have become more and more popular.


5. Relationship between expansion pressure and temperature

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The speed of the hydration reaction of the crusher is closely related to the temperature. In the past, before the factory implemented the "order-based" production, the spring-autumn static breaker was suitable for temperatures between 10 °C and -25 °C, even in this range, if used at temperatures of 13 °C and 20 °C, respectively. The expansion pressure generated at the same time is also doubled. As a result, dry, medium and late grouting during the day has a great impact on the crushing effect.

In order to facilitate construction and improve the crushing effect, our factory implements "order-based" production, which is to produce products suitable for customers according to different construction environment temperatures and hardness of broken materials.


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