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Deterioration and preservation of stone

Short answer

Deterioration is the gradual decay of stone from weathering and chemical attack, losing strength and appearance. Preserve by using dense, seasoned stone, placing bed perpendicular to load, smooth dressing, proper drainage, and applying protective coatings like silicone or baryta water, along with regular cleaning and pointing.

What is the deterioration of stone and how is it preserved?

Deterioration of stone is the gradual decay of stone in which it loses strength, colour and surface because of weathering and chemical action over time.

Causes

  • Rain, moisture and frost action in the pores.
  • Acid gases (SO₂, CO₂) in the air forming acids that dissolve limestone and sandstone.
  • Temperature changes causing expansion and contraction.
  • Crystallisation of salts in the pores and growth of lichen or roots.
  • Wind abrasion and wrong laying of the natural bed.

Preservation

  1. Select dense, low-porosity stone and season it.
  2. Dress the surface smooth and provide proper drainage and projections.
  3. Place stratified stone with the bed perpendicular to the load.
  4. Coat the surface with oil paint, linseed oil or wax, or silicone water repellents; use Baryta water or alum-soap solution to fill the pores.
  5. Maintain the stone by regular cleaning and good pointing.

✓ Answer checked by Claude Opus 5.5 (high effort)

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