engineering

Non-explosive demolition agents

Non-explosive demolition agents is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Non-explosive demolition agents rather than just read about it. In short: Non-explosive demolition agents are chemicals that are an alternative to explosives and gas pressure blasting products in demolition, mining, and quarrying. 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.

Key takeaways

Non-explosive demolition agents belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Non-explosive demolition agents to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Non-explosive demolition agents from memory before moving on to harder problems.

Reference excerpt

Non-explosive demolition agents are chemicals that are an alternative to explosives and gas pressure blasting products in demolition, mining, and quarrying. 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.

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

See also Plug and feather Explosive material Mining

References

Worked examples

Example 1 — a first encounter with Non-explosive demolition agents

Start with the simplest possible case. Write down what Non-explosive demolition agents claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Non-explosive demolition agents before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Non-explosive demolition agents ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Non-explosive demolition agents

In research: Non-explosive demolition agents appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Non-explosive demolition agents in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Non-explosive demolition agents is common in secondary-school and first-year university syllabi. It links to neighbouring topics Building engineering, Chemical engineering, so understanding it makes those chapters shorter.
In everyday life: Look for Non-explosive demolition agents outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Non-explosive demolition agents in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Non-explosive demolition agents means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Non-explosive demolition agents out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Non-explosive demolition agents in simple terms?

Why does Non-explosive demolition agents matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Non-explosive demolition agents?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Non-explosive demolition agents.