Three choices for granite stone selection

Granite is a special rock composed of quartz, feldspar and mica as the main proprietary minerals with aesthetics, durability and formability. Different types of granite have different application scopes and applications. The aesthetics and durability of the object will increase. So how do you choose granite in your daily use?

1. The application of granite should first follow the guarantee of the building quality of the building.

Granite is one of the most widely used building materials, its durability can reach 75-200 years, but if you choose unsuitable granite stone, the building's robustness and durability will be reduced, use Life expectancy will also decrease. Granite stone used in outdoor curtain wall should choose stone with small mineral particles, high density between minerals and minerals, uniform texture, and less weathering mineral content, especially in the part with weight bearing effect. The mineral particles are small, and the tightness between minerals and minerals is high, so that the minerals on the surface of the stone are not easy to fall off in the natural environment of wind and rain; in the stone with 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 that the physical properties of different parts are very different; the content of easily weathered minerals can increase the degree of weathering resistance of minerals, and different construction techniques can reduce the area of ​​easily weathered minerals on stone surfaces and increase the resistance to weathering minerals. The area can also improve the weather resistance of the stone.

The choice of granite stone should also consider the physical properties of granite stone. GB/T18601-2001 "Natural Granite Building Board" specifies the bulk density of granite to be greater than or equal to 2.56Mg·m-3, compressive strength greater than or equal to 100MPa, bending strength greater than or equal to 8MPa, water absorption rate The requirement is 0.6% or less, and the building stone should be selected in strict accordance with this standard to ensure the material quality. For example, Laizhou Bai-Elong Granite (Shandong Baima, Laizhou White) has a bulk density of 2.6Mg·m-3 and a flexural strength of 5.6MPa, while GB/T18601-2001 “Natural Granite Building Board” stipulates that the flexural strength is greater than Or equal to 8MPa, so Laizhou Bai-Secondary granite is not suitable for key parts of the building; for example, Wulianhong-Secondary granite has a compressive strength of 92.89 MPa, which is also not a key part of the building. Therefore, when purchasing stone, you should ask for a real test report, and choose according to the corresponding physical properties.

2, the color pattern of granite stone should be coordinated with the surrounding environment

Different granites have different colors due to different minerals, such as stone with more peridotite minerals, more black color, more chlorite minerals, more green color; in addition to the color of the stone itself, With different processing techniques, the color of granite will be slightly different. Generally speaking, the same kind of stone, the color of the glossy surface looks darker than the color of the burnt surface and the particle surface or other rough surface. Will affect the use of stone. Choosing the right color pattern of the stone can beautify the building, increase the aesthetics of the building, and also improve the coordination between the building and the surrounding environment.

3. Suggestions for stone selection based on cluster analysis results

GB/T18601-2001 "Natural Granite Building Board" specifies the bulk density of granite to be greater than or equal to 2.56Mg·m-3, compressive strength greater than or equal to 100MPa, and bending strength greater than or equal to 8MPa; JTG F30-2003 In the "Technical Specifications for Cement Concrete Pavement Construction", the compressive strength of igneous rock is not less than 100 MPa, the compressive strength of heavy traffic is: 57.5 MPa, the bending strength is 7.5 MPa, and the compressive strength of heavy traffic is: 52.5 MPa. 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 shall not be less than 8 MPa; GB50209-2002 "Code for Construction Quality Acceptance of Building Floor Engineering" stipulates that the compressive strength of cement concrete integral surface layer is After 5MPa, the person can walk, and the compressive strength can meet the design requirements before it can be used normally. The four types of granites A, C, D and E are in compliance with the above national standards. The compressive strength of Class B granite is lower than that of GB/T18601-2001 "Natural Granite Building Board" and JTG F30-2003. The technical specifications for the construction of cement concrete pavements are in accordance with the provisions on the compressive strength.

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