Granite refers to a special rock composed of quartz, feldspar, and mica with aesthetics, durability, and easy formability. Different types of granite have different scopes of use, and they can be used properly for building Beauty and durability will be improved. So how to choose granite in daily use?
  1. The application of granite should first follow to ensure the construction quality of the building
Granite is currently one of the most widely used building materials. Its durability and durability can reach 75-200 years. However, if you choose unsuitable granite, the durability and durability of the building will be reduced, and the service life will be reduced. Will decrease.
  The granite used in the outdoor curtain wall should choose the stone with small mineral particles, high closeness between minerals and minerals, uniform texture, and low content of easily weathered minerals, especially when it is applied to the parts with load-bearing function, and the material selection should be paid more attention to. The mineral particles are small and the closeness between the minerals and the minerals is high, which makes the surface minerals of the stone not easy to fall off in the natural environment of wind and rain; in the stone of uniform texture, there should be no weak interlayer or weak veins in the stone, and the minerals are evenly distributed , It is not easy to appear the phenomenon that the physical performance indicators of different parts are very different; the content of easy-weathering minerals is small, which can improve the degree of weathering resistance of the minerals, and different construction techniques can also be used to reduce the area of ​​easy-weathering minerals on the stone surface and increase the resistance to weathering minerals. The area can also improve the resistance to weathering of the stone.
  The choice of granite should also consider the physical properties of granite. GB/T18601-2001 "Natural Granite Building Slabs" stipulates that the bulk density of granite is greater than or equal to 2.56Mg·m-3, the compressive strength is greater than or equal to 100MPa, the bending strength is greater than or equal to 8MPa, and the requirements for water absorption are If it is less than or equal to 0.6%, stone materials for construction should be selected in strict accordance with this standard to ensure the quality of the materials.
For example, Laizhou white-monzonite granite Shandong Baima and Laizhou white have a bulk density of 2.6Mg·m-3 and a bending strength of 5.6MPa. The bending strength of GB/T18601-2001 "Natural Granite Building Slabs" stipulates that the bending strength is greater than or equal to 8MPa, so Laizhou white-monzonite granite is not suitable for key parts in construction; for example, Wulianhong-monzonite granite has a compressive strength of 92.89 MPa, which is also not suitable for key parts in construction. Therefore, you should ask for a real test report when buying stone, and make a selection based on the corresponding physical properties.
  2, the color pattern of granite stone should be in harmony with the surrounding environment
Different granites have different colors due to different minerals. For example, the color of stone with more olivine minerals is more black, and the color of stone with more chlorite minerals is more green. In addition to the color of the stone itself, With different processing techniques, the color of granite will be slightly different. Generally speaking, the color of the smooth surface of the same stone is darker than the color of the singeing surface, the particle surface or other rough surfaces. Will affect the use of stone. Choosing stones with appropriate colors and patterns can beautify the building, increase the beauty of the building, and also improve the coordination between the building and the surrounding environment.
  3. Suggestions for stone selection based on the results of cluster analysis
GB/T18601-2001 "Natural Granite Building Boards" stipulates that the bulk density of granite is 2.56Mg·m-3 or more, the compressive strength is greater than or equal to 100MPa, and the bending strength is greater than or equal to 8MPa; JTG F30-2003 The "Technical Specification for Cement Concrete Pavement Construction" stipulates that the compressive strength of igneous rock is not less than 100MPa, the compressive strength of heavy traffic is: 57.5Mpa, the bending strength is: 7.5Mpa; the compressive strength of heavy traffic is: 52.5Mpa , The bending strength is: 7Mpa; the compressive strength of medium and light traffic is: 42.5Mpa, and the bending strength is: 6.5Mpa. GB50210-2001 "Code for Quality Acceptance of Building Decoration Engineering" stipulates that the bending strength of stone in stone curtain wall engineering should not be less than 8MPa; GB50209-2002 "Code for Construction Quality Acceptance of Building Ground Engineering" stipulates that the compressive strength of the cement concrete overall surface is up to People can walk after 5MPa, and the compressive strength can meet the design requirements before normal use. The four types of granites A, C, D and E meet the requirements of the above national standards. The compressive strength of B granites is lower than GB/T18601-2001 "Natural Granite Building Plates" and JTG F30-2003 " "Technical Specification for Construction of Cement Concrete Pavement" stipulates the compressive strength.