Construction Engineering-Characteristics and Application of Decorated Stone and Building Ceramics I. Natural granite 1.Features: compact structure, high strength, high density, hard and wear-resistant, belonging to acid hard stone; 2.Physical properties: density, water absorption, compressive strength, bending strength and wear resistance should meet the relevant requirements; 3.Scope of application: Mainly used in large public buildings or decorative grade requirements of high indoor and outdoor decoration projects. Radioactivity of Natural Stones The specific activity of natural radionuclides (radium-226, thorium-232, potassium-40) and the limit value of external exposure index in decoration materials (granite, architectural ceramics, gypsum products, etc.) can be divided into three categories: A, B and C: the production, marketing and use of category A products are not limited; B products can not be used for the interior of category I civil buildings, but can be used for the exterior decoration of category I civil buildings and all other construction.The interior and exterior decoration of buildings; Category C products can only be used for exterior decoration of all buildings. 3. Natural marble 1.Characteristic and scope of application: compact texture, high compressive strength, low water absorption, soft texture, belongs to alkaline medium hard stone, easy to react with sulfide in the air, discoloration, powder loss, luster, so it is mainly used indoors; 2.Physical properties: bulk density, water absorption, dry compression strength, bending strength, wear resistance, mirror gloss of mirror panels should meet the relevant requirements. IV. Sanitary Ceramics 1.Sanitary ceramics were divided into ceramic sanitary ceramics (water absorption rate E < 0.5%) and stoneware sanitary ceramics (water absorption rate 0.5%). 2.The nominal water consumption of toilets limits the water consumption of various products, among which the common type of toilet and the water-saving type are no more than 6.4L and 5.0L respectively; the common type of squatting toilet is no more than 8.0L (single-impact type) and 6.4L (double-impact type), and the water-saving type is no more than 6.0L; the water-saving type of urinal is no more than 3.0L and 4.0L respectively.

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