Lu Hui Stone Quality and Performance Test Method Release time: 2015-11-13 Visits: Times
The quality and performance of building decorative stone is very important for its industry. Similarly, the following standards are also applicable to the quality and performance evaluation of Lu gray stone .
1 Why should the physical and chemical properties of the stone be tested?
The application of stone to all aspects of the building is very different from the natural and man-made conditions. The various conditions that stone may encounter are artificially summarized together to prove whether the performance of a certain stone is in line with the design. The requirements provided scientific reference data for design users. Therefore, a set of test content for stone was proposed, which became a test method for detecting the physical and chemical natural stone of stone.
There are 11 aspects of stone physical and chemical testing methods.
1.1 Test method for compressive strength after drying, water saturation and freeze-thaw cycles;
1.2 Dry and water saturated flexural strength test method;
1.3 Test methods for bulk density, true density, true porosity, and water absorption;
1.4 Abrasion resistance test method;
1.5 Shore hardness test method;
1.6 acid resistance test method;
1.7 Test method for detecting the mounting strength of the panel pendant combination unit;
1.8 Test method for structural strength of stone mounting system using uniform static pressure difference;
1.9 Analysis of chemical composition (composition of each mineral content) of stone;
1.10 Evaluation of stone radioactivity;
1.11 Stone Comprehensive Evaluation System: Including decorative performance evaluation, green stone index, green stone comprehensive evaluation system, and the use of the comprehensive evaluation system.
Of course, as stone (including artificial stone), it also has many indicators such as tensile strength, thermal expansion coefficient, specific heat capacity, thermal conductivity, volume resistivity, dielectric constant, dielectric loss tangent, dielectric strength, etc. Requirements for the use of stone in the chemical, mechanical, and geological fields. But as a building decorative stone, as long as it meets the above 11 contents, especially the first 10 requirements can be used.
2. What preparations should be done for the compression strength test of natural stone after drying, water saturation, and freeze-thaw cycles?
Natural Lu gray stone is widely used as a building material. It is used in many fields. The natural conditions faced are repeated cycles from high temperature to low temperature freezing. In order to prevent the stone from cracking in this condition in future use. If the use value is lost, you need to artificially simulate the natural conditions in advance to test the stone. The compressive strength test of natural stone after drying, water saturation, and freeze-thaw cycles is one of them. The following preparations are required for this test.
2.1 Equipment and measuring tools
Testing machine; the relative error of the indication value with the spherical support is not more than ± 1%, and the test failure load should be within the range of 20% ~ 90% of the indicated value.
Vernier caliper: The reading value is 0.01mm.
Universal Angle Ruler: Accuracy is 2 ′.
Drying box; temperature can be controlled within 105 ℃ ± 2 ℃.
Freezer: The temperature can be controlled within the range of -20 ℃ ± 2 ℃.
2.2 Stone samples
Dimensions: a cube with a side length of 50mm or a cylinder with a length of 650mm × 50mm.
Quantity: Five samples are required for each test, and five are used as a group for data statistics. The compression strength test after drying, water saturation, and freeze-thaw cycles requires 15 samples; if the vertical bedding test after drying, water saturation, and freeze-thaw cycles is performed, and the compression strength test for parallel bedding requires 30 tests kind.
The sample should indicate the direction of layering: some stone materials have obvious direction of layering. Use a color pen to mark out the layering. Such as Lu gray stone granite, marble, slate many varieties have this phenomenon, the other directions of division can be divided into the following three.
2.2.1 Fracture direction This is the direction in which the stone is most likely to split. Mark it with a pen.
2.2.2 Direction of texture The second direction that is easy to split is marked with a pen.
2.2.3 The direction in which the source-particle direction is the most difficult to divide is marked with a pen.
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