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[wikipe] Wikipedia The Free Encyclopedia Search [ ] Search * Create account * Log in [ ] Personal tools * Create account * Log in Pages for logged out editors learn more * Contributions * Talk Contents move to sidebar hide * (Top) * 1See also * 2References [ ] Toggle the table of contents Non-explosive demolition agents [ ] 6 languages * Espanol * Ri Ben Yu * Norsk bokmal * Russkii * Suomi * Svenska Edit links * Article * Talk [ ] English * Read * Edit * View history [ ] Tools Tools move to sidebar hide Actions * Read * Edit * View history General * What links here * Related changes * Upload file * Special pages * Permanent link * Page information * Cite this page * Get shortened URL * Wikidata item Print/export * Download as PDF * Printable version From Wikipedia, the free encyclopedia Chemical mixtures that expand on setting in drilled holes to split rock This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and [50px-Q] removed. Find sources: "Non-explosive demolition agents" - news * newspapers * books * scholar * JSTOR (January 2024) (Learn how and when to remove this template message) 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 +-------------------------------------------------------------------------------+ | | Parameter | | | |-----------------------------------------------------------|Usage | |Application |Aperture (mm)^|Pitch-row (cm)| Array pitch | |amount| | |[clarification| ^[ | (cm)^[ | Bore depth |(kg/m^| | | needed] |clarification |clarification | | 3) | | | | needed] | needed] | | | |------------+--------------+--------------+--------------+--------------+------| | | | | | H^[ | | |Light Rock | 30-45 | 30-50 | 30-50 |clarification | 8-10 | | | | | | needed] | | |------------+--------------+--------------+--------------+--------------+------| |Medium-hard | 30-45 | 25-40 | 20-35 | 1.05H |10-15 | |Rock | | | | | | |------------+--------------+--------------+--------------+--------------+------| |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| 35-50 | 20-30 | 25-35 | 0.9H | 8-15 | |Boulder | | | | | | |Stones | | | | | | |------------+--------------+--------------+--------------+--------------+------| |Reinforced | 30-45 | 15-25 | 15-25 | H |15-25 | |Concrete | | | | | | +-------------------------------------------------------------------------------+ Many patents describe non-explosive demolition agents containing CaO, SiO[2] and/or cement.^[2] See also[edit] * Plug and feather * Explosive material * Mining * Quarry References[edit] 1. ^ Gambatese, John A. (February 2003). "Controlled Concrete Demolition Using Expansive Cracking Agents". Journal of Construction Engineering and Management. American Society of Civil Engineers. 129 (1): 98-104. doi:10.1061/(ASCE)0733-9364 (2003)129:1(98). 2. ^ "Patents: Non-explosive Demolition Agents". www.baustoffchemie.de. 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