Conas Táirgí Cloch Foirgníochta Dea a Roghnú
Aug 08, 2020
1.Appearanceandcolour: Stoneswithmuchironshouldbediscouragedastheformationofironoxidesdisfiguresthemandbringsaboutdisintegration.
2.Hardnessandtoughness: Agoodbuildingstonemustbehardandtough.Hardnessmaybetestedbyscratchingbypenknifeandtoughnessbysubjectingittohammeraction.
3.Strength: Buildingstonesshouldbestrongincompression.
4.Porosityandabsorption: Stoneswithmuchporesareunsuitablebecauseofwaterseepingintoporeswithacidsandfumesdestroythestone.Watermayfreezeatcolderclimateandhencesplitthestone.
Finenessofgrains: Oibreacha Finegrainedaresuitableformoulding.
