Sovereignty Module: Burn the Stone
Complete Lime Production, Mortar Making, and Plaster Guide
Lime is civilization's universal binder. It makes mortar for walls, plaster for surfaces, whitewash for sanitation, soil amendment for agriculture, and water purification for health. This campaign covers burning limestone into quicklime and all its applications.
Chapter 1: The Lime Cycle
| Stage | Process | Product | Formula |
|---|---|---|---|
| 1. Raw material | Quarry or collect limestone | Calcium carbonate | CaCO3 |
| 2. Burning (calcination) | Heat to 1650F+ (900C+) for hours | Quicklime (calcium oxide) | CaCO3 → CaO + CO2 |
| 3. Slaking (hydration) | Add water to quicklime | Slaked lime (calcium hydroxide) | CaO + H2O → Ca(OH)2 + heat |
| 4. Setting (carbonation) | Expose to air (CO2) over time | Returns to calcium carbonate | Ca(OH)2 + CO2 → CaCO3 + H2O |
The lime cycle is circular: limestone becomes quicklime becomes slaked lime becomes limestone again. The final product is chemically identical to the original stone.
Chapter 2: Burning Lime (Kiln Methods)
| Kiln Type | Capacity | Fuel | Burn Time | Skill |
|---|---|---|---|---|
| Clamp kiln (temporary pile) | 1-5 tons | Wood, coal | 3-7 days continuous | Low-moderate |
| Flare kiln (intermittent) | 5-20 tons | Wood, coal | 2-4 days | Moderate |
| Draw kiln (continuous) | Continuous feed | Coal, wood | Continuous operation | High |
| Pit kiln | 0.5-2 tons | Wood | 2-4 days | Low |
Simple clamp kiln construction:
- Build fire grate (stone arch or iron bars) at ground level
- Stack limestone pieces above grate (fist-sized, loosely packed for air flow)
- Cover sides and top with clay/mud (leave top vent and bottom air holes)
- Fire continuously for 48-72 hours at 1650F+ (900C+)
- Lime is done when stones are white, lighter weight, and ring when struck
- Cool slowly (24-48 hours) before removing
Chapter 3: Slaking Quicklime
| Method | Process | Product | Use |
|---|---|---|---|
| Dry slaking | Sprinkle water on quicklime until it crumbles to powder | Dry hydrated lime powder | Mortar, plaster (immediate use) |
| Wet slaking (putty) | Submerge quicklime in excess water, stir, age | Lime putty | Superior plaster, fine mortar |
| Hot lime | Mix quicklime directly with sand and water | Hot lime mortar | Immediate use mortar |
SAFETY: Quicklime reacts violently with water. Generates extreme heat (can boil water, cause burns). Wear eye protection, gloves, long sleeves. Add lime to water (never water to lime in large quantities). Work outdoors.
Lime putty aging: Fresh putty is usable but improves with age. 3 months = good. 1 year = excellent. Roman lime putty was aged 3+ years. Store submerged under water (prevents carbonation).
Chapter 4: Lime Mortar
| Mix Ratio (Lime : Sand) | Use | Properties |
|---|---|---|
| 1:2 | Pointing, fine joints | Rich, smooth, slow set |
| 1:2.5 | General masonry mortar | Standard, good workability |
| 1:3 | Thick walls, rough stone | Economical, adequate strength |
| 1:1 (lime : pozzolan) + sand | Hydraulic mortar (sets underwater) | Strong, water-resistant |
Hydraulic lime: Adding pozzolans (volcanic ash, crusite brick dust, calcined clay) to lime creates hydraulic lime that sets by chemical reaction (not just carbonation). Sets faster, harder, and works underwater. Roman concrete used this principle.
Chapter 5: Lime Plaster
| Coat | Mix | Thickness | Purpose |
|---|---|---|---|
| Scratch coat (base) | 1 lime : 3 coarse sand + animal hair | 3/8-1/2 inch | Bonds to wall, provides key |
| Brown coat (level) | 1 lime : 3 medium sand | 3/8 inch | Levels surface |
| Finish coat (skim) | 1 lime putty : 1 fine sand (or pure lime) | 1/8 inch | Smooth decorative surface |
Application: Each coat must be scratched (scored) before it sets to provide key for next coat. Each coat must be misted with water for 3-7 days (lime needs moisture to carbonate properly). Do not apply in freezing temperatures.
Chapter 6: Other Lime Applications
| Application | Method | Purpose |
|---|---|---|
| Whitewash (limewash) | Lime putty + water (milk consistency) | Antimicrobial coating, brightens, protects |
| Water purification | 1-2 grams per liter, stir, settle 24 hours | Kills bacteria, clarifies water |
| Soil amendment | 1-2 tons per acre | Raises pH of acidic soil |
| Tanning (hide preparation) | Soak hides in lime water 1-2 weeks | Loosens hair, swells hide |
| Nixtamalization (corn) | Cook corn in lime water | Releases niacin, improves nutrition |
| Pit latrine treatment | Sprinkle over waste | Reduces odor, kills pathogens |
| Egg preservation (water glass alternative) | Submerge eggs in lime water | Seals pores, preserves 6-12 months |
| Insect deterrent | Dust or paint on surfaces | Repels insects |
Reference Card
- Limestone burns to quicklime at 1650F+ (900C+) for 48-72 hours continuous
- Quicklime + water = slaked lime (CAUTION: extreme heat, wear protection)
- Lime putty improves with age: 3 months good, 1 year excellent, 3 years superior
- Standard mortar: 1 part lime putty to 2.5-3 parts sand
- Add pozzolan (brick dust, volcanic ash) for hydraulic set (works underwater)
- Three coats of plaster: scratch, brown, finish. Score each before next.
- Lime needs moisture to set: mist plaster for 3-7 days after application
- Whitewash is antimicrobial: use on animal housing, food storage, latrines