what to know about building stone expression is that Building stone expression can be clarified as sound stone meaning that it can be safely used as a large dressed or undressed unit under certain conditions.
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Granite and marble used in the form of well-dressed blocks or slabs or pillars in large and expensive buildings are good building stones. Similarly, sandstone and limestone used in forts, walls and boundary walls as well as blocks in stone houses and bungalows are common building stones. Slate, used in many places as a roofing material for general buildings and pavements, also falls under the category of building stones. Masonry is an engineering art that has been preserved in many historic buildings in all parts of the world. In many places these skills are still used to some extent (due to the advent of concrete) in the construction of traditional residences and palatial buildings. The Taj Mahal in Agra, the Red Fort in Delhi and the temples of Jagannathpuri are some of the famous stone wonders of India. Such examples can be collected from all countries of the world and the number can reach several hundreds. Properties of building stones: The physical, structural and other properties a stone must possess to be recommended as a building stone will depend on the type of construction and the specific construction context in which the stone is to be used. Thus the stone used for the floor of a building does not necessarily possess all the qualities that make the stone suitable for use in load-bearing foundations and walls. Similarly, the stones required for retaining walls do not necessarily have all the properties required for use in front walls. Therefore, it is considered convenient to discuss the various features governing the selection of building stones under three sub-headings: (a) Dynamic characteristics, Advertisement: (b) geographical character and (C) General characters. (a) Dynamic characteristics: Stone, like all other solid materials, fails when subjected to loads exceeding its strength. Failure occurs under compressive, compressive and shear forces at different scales. However, it is the arbitrary compressive strength, which is considered the most important property of the rock index. 
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1.Compressive strength: It is also sometimes referred to as the crushing strength of rock and can be defined as the maximum force, expressed per unit area, that the rock can withstand without cracking. Any applied force greater than the compressive strength will cause the rock to fail or crack. Mathematically, uniaxial compressive strength is expressed by a simple relationship: Co = P/A where Co = compressive strength/unit area; P = load at failure, A = Area of rock cross section below P. Practical determination of unconfined compressive strength of building stones is carried out in a well-equipped civil engineering laboratory. Representative test specimens of standard size (either cubes of 5 cm side or cylinders of length-to-diameter ratio 2 - 2. 5) are carefully prepared, one at a time, slowly loaded onto the plate based on the UTM (Universal Testing Machine). Loading is continued until the first crack appears in the test specimen which indicates the onset of failure. Any further loading will fragment the model. The failure load (P) divided by the cross-sectional area of the specimen gives the unconfined compressive strength of the rock. The value is called uniaxial or uniaxial because the test specimen has no lateral support or restraint and is compressed along one axis only. When compressive strength is tested by storing the specimen in a special cell (triaxial cell) filled with liquid under pressure, providing lateral support, the value obtained is called strength a pressure a confined or triaxial. However, it is the unconstrained or axial compressive forces that are commonly considered in civil engineering, including masonry. The compressive strength of a rock depends on many factors such as its formation, size, texture and composition, its moisture content and the amount of residual weathering it has been exposed to. Igneous rocks are crystalline, compact and homogeneous in structure and have relatively high compressive strength compared to sedimentary and metamorphic rocks. 
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In the latter two groups, most weaknesses such as bedding planes, foliation, schistosity and cleavage significantly affect the compressive strength of successive rocks in shape and direction. Directionally speaking, sandstone may exhibit much lower compressive strength when loaded parallel to the bedding plane than when the same rock is loaded perpendicular to the same structure. Except for some types of massive sandstones, limestones, quartzites, marbles, and gneisses, most sedimentary and metamorphic rocks are naturally weak in crushing strength. The strength values obtained from laboratory tests show considerable variation with respect to the same rock depending on the size of the test specimen, the smoothness of the contact planes of the test specimens, the rate of loading and the loading time etc. Therefore, all laboratory tests are carried out strictly according to the code of standards issued by the specified authority of the country. (Bureau of Indian Code of Standards should be referred to in India while designing construction in stone). Rocks are natural stone of igneous, sedimentary or metamorphic origin. Most of the stones are sufficiently mixed to enable them to be cut for use in making walls, footings or roofing material, or to form various shapes and blocks or slabs. Stone is widely used in the construction of hundreds of buildings and structures. Stones are classified into building stones, decorative stones and measuring stones. Construction stone is chosen for its durable properties, attractiveness and economy. Measured stone is a building stone that is usually quarried and formed into blocks to specifications. An ornamental stone is a stone that can be quarried, cut or carved and is highly valued for its attractive appearance. It is more frequently used in interior construction for decoration and monuments than standard building stone. 
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Millions of stone blocks are required every year for road foundations, paving, ready-mix asphalt and concrete. The study of rock properties is part of engineering geology and mining geology. My company has for years been leading the world market in both supply and export of building stone products for over years and is therefore gently honored to have provided a link for all dear customers and traders to join us in world trade of building stone and experience the best purchase ever in your life. read more: