Building Stones Characteristics
The various properties of good building stones are:
- Structure: Broken stone should not look faded and its uniform texture should be free from cavities, patches of soft material, and cracks.
- Strength: Stones used in construction should be strong and durable to withstand the disintegrating action of the weather. Generally, the stones can withstand the forces they encounter in usual constructions but in case of constructions where the forces encountered are unusual, they should be tested for its strength. Stones with compact fine crystalline texture are stronger. The compressive strength of building stones in practice ranges from 60 to 200 N/mm2.
- Hardness: The building stone should possess sufficient hardness which resists the development on its surface, due to any sudden blow or load.
- Water absorption: The water absorption for any type of building stone should range between 1-10% of its total dry height when immersed in water for 24 hrs.
- Weathering: The building stone should stone be able to resist the wear and tear due to the weathering action.
- Fire resistance: The building stone should not disintegrate easily on heating and it should be able to withstand the maximum heat produced through fire.
- Specific gravity: The specific gravity of the stones ranges between 2.3 – 2.5
- Workability: Cutting and dressing of the building stone should be economical and the durability of stone should be more.
- Appearance: Building Stones used for the face work of the building should have a fine, compact texture. Light-colored stone is usually preferred as dark colors are prone to fade out with time. They should be free from clay holes, bands or spots of color.
- Toughness: It is the measure of the impact that a stone can withstand. When the stones are supposed to undergo vibrations of machinery and moving loads, they should be tough.