- Non-Explosive Demolition Agents are
the one which can be used to demolish rock and concrete structures
in dust and noise sensitive areas and
places close to inhabited areas, natural gas lines, pipelines,
roadways or other areas where the use of explosive would generate
significant safety risk.
- To use non-explosive demolition agents
in
demolition or quarrying, holes are to be drilled on the base rock
according to drilling pattern supplied.. A thoroughly mixed
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
- Soundless chemical demolition agents (SCDAs)
have proven to be viable substitutes for the use of explosives
- SCDAs are powdery materials that will
expand considerably when mixed with water. This expansion, when
occurring under confinement, generates significant expansive
pressures. These pressures are sufficient to break up rock and
concrete when the SCDA is confined in a borehole or a series of
boreholes
- Non-explosive demolition agents
consists usually of calcium oxides, silicon dioxide, and little
other ingredients
- The material used is generally
environmentally
friendly and can be disposed of as normal construction waste.
- Shape memory alloys (SMAs) to split
apart rock
formations without explosives or hydraulics is another technology
developed recently
- When explosive are used for the
demolition, it is
known as Implosion. The various steps involved before the demolition
process are surveying, removal of hazardous materials, preparation
of demolition plan, stability report and the precautionary safety
measures that to be taken are
- In India these are extensively being
used in natural stone quarrying industry, and termed as ever best
method techno-economically because of its
unique characteristics of application results. It is also being in
use for applications like demolition of rock and concrete structures
inside tunnels, heavy
process plants, and for rock demolition in land development, boulder
demolitions in road constructions, etc.
- Patented technologies are available
and the demolition agents are in the form of powder mixtures
comprising quicklime, an alkali metal carbonate or bicarbonate, an
organic base carbonate or bicarbonate or mixtures thereof, and
either or both of hydroxycarboxylic acid or its salt and
fluidization agent
- The relatively high cost of SCDAs
makes makes
the SCDA’s market very limited.
- SCDAs were introduced early 1970s but
failed to gain widespread adoption for selective removal of rock and
concrete due to their proprietary nature and a lack of usage
guidelines. Nearly 40 years later, the patents have expired, and a
large number of competitive products have entered the market. These
factors coupled with a heightened interest in their potential
environmental benefits have greatly expanded their usage.
- SCDAs are manufactured primarily in
Japan, China, Russia, and some countries in Europe
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Technical
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Patent -
Demolition agent for Brittle Materials
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Patent -
demolition agent
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Patent - Rock &
Concrete breaking system
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Non explosive
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Method of
effecting expanding chemical anchor for roack cavities
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Testing machine for
Expansive Mortar
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Demolition of
Structures Using Implosion Technology
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Environment &
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Demolition in
High Hazard Environments
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Using Chemicals as Demolition
Agents Near Historic
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