Cement: Difference between revisions
Gave the production and uses for lime(cement) |
→Materials needed: volcanic ash (pozzalano) optional ingredient wich greatly strenghtens concrete |
||
| (One intermediate revision by one other user not shown) | |||
| Line 4: | Line 4: | ||
Cement is primarily produced by slaking quicklime. This involves adding the quicklime to water to convert it from CaO to CaOH. In this state it can be used as a pickling lime, as cement, plaster, mortar or as a food additive. Though there are many forms of cement, most involve taking limestone, aragonite or seashells, heating them above 900c to remove the organics, then slaking the resultant quicklime. | Cement is primarily produced by slaking quicklime. This involves adding the quicklime to water to convert it from CaO to CaOH. In this state it can be used as a pickling lime, as cement, plaster, mortar or as a food additive. Though there are many forms of cement, most involve taking limestone, aragonite or seashells, heating them above 900c to remove the organics, then slaking the resultant quicklime. | ||
== Materials needed == | |||
* 80% '''Limestone (calcium carbonate)''' | |||
* 15-20% '''[[Clay]] or Shale''' | |||
* 0-5% '''Rust powder ([[Iron|iron oxide]])''' | |||
* '''Gypsum (CaSO₄)''' (5% of the total mass of previous mixture) | |||
* A '''rotary [[kiln]]''' | |||
* Volcanic ash (increases strenght and gives self repairing properties (optional)) | |||
== Crafting instructions == | |||
# Grind all ingredients into a fine powder using a mortar and pestle or ball mill. Mix thoroughly to get a uniform raw meal. | |||
# Heat mixture in a crucible or kiln to 1450°C (2642°F) for about 30 minutes, forming pellets called clinker. | |||
# Cool rapidly to preserve mineral phases (drop into dry sand or on a steel plate). | |||
# Grind clinker into a fine powder. | |||
# Add gypsum (CaSO₄·2H₂O) equal to 5% by weight and grind again to make true cement. | |||
== Uses == | |||
Cement has a strong compressive strength and can be poured to fit any mold. this versatility has led to widespread use in construction including roads, buildings, bridges, and more. | |||
== Dependencies == | == Dependencies == | ||
Latest revision as of 17:28, 11 May 2025
Cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Concrete is the most widely used material in existence and is behind only water as the planet's most-consumed resource.
Cement is primarily produced by slaking quicklime. This involves adding the quicklime to water to convert it from CaO to CaOH. In this state it can be used as a pickling lime, as cement, plaster, mortar or as a food additive. Though there are many forms of cement, most involve taking limestone, aragonite or seashells, heating them above 900c to remove the organics, then slaking the resultant quicklime.
Materials needed
- 80% Limestone (calcium carbonate)
- 15-20% Clay or Shale
- 0-5% Rust powder (iron oxide)
- Gypsum (CaSO₄) (5% of the total mass of previous mixture)
- A rotary kiln
- Volcanic ash (increases strenght and gives self repairing properties (optional))
Crafting instructions
- Grind all ingredients into a fine powder using a mortar and pestle or ball mill. Mix thoroughly to get a uniform raw meal.
- Heat mixture in a crucible or kiln to 1450°C (2642°F) for about 30 minutes, forming pellets called clinker.
- Cool rapidly to preserve mineral phases (drop into dry sand or on a steel plate).
- Grind clinker into a fine powder.
- Add gypsum (CaSO₄·2H₂O) equal to 5% by weight and grind again to make true cement.
Uses
Cement has a strong compressive strength and can be poured to fit any mold. this versatility has led to widespread use in construction including roads, buildings, bridges, and more.
Dependencies
See also
References
| This article uses material from the Wikipedia article Cement, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors). | 
|
External links
- Wood ash cement, primitivetechnology.wordpress.com. 17 July 2018.
- How to make Cement From Snail's Shell - Pre Technology, 14 October 2021, YouTube