Water absorption ≦0.60%
Degree of dry compression (pressure resistance) ≧100MPa
Bending degree (bending resistance) ≧ 8.0MPa
Qualified marble slabs should meet the specifications of four physical properties <br> Volume density ≧ 2.60g/cm3
Water absorption ≦0.5%
Degree of dry compression (pressure resistance) ≧50MPa
Bending degree (bending resistance) ≧7.0MPa
What is the compressive strength and the compressive properties of the stone?
Compressive strength refers to the rock's ability to resist damage in a single direction of compression. The magnitude of the compressive strength indicates the hardness of the rock.
The compressive strength is expressed in MPa, 1MPa = 10.2kg/cm2 (kg force/cm2)
One standard atmosphere pressure = 760 mmHg = 76 cm Hg = 1.013 x 105 Pascal = 10.36 m water column.
In order to ensure that the standard atmospheric pressure is a fixed value, the resolution of the 10th International Metrological Conference in 1954 stated that the standard atmospheric pressure is 1 standard atmosphere = 101325 N/m 2
According to the "JC205-92 natural granite building board" standard, the dry compression strength is not less than 60.0 MPa.
According to "JC79-92 natural marble building board" standard, the marble dry compression strength is not less than 20.0 MPa.
In general, the compressive strength of granite is between 110-245 MPa, and the compressive strength of marble is between 70-110 MPa.
What is the bending strength, the bending resistance of the stone?
The flexural strength is equivalent to the previously called flexural resistance and refers to the ability of a certain specification of facing sheet to resist fracture at two supporting points.
The flexural strength of stone is far lower than the compressive strength, and the test is about 1/14~1/8 of the compressive strength. Generally obtained from the compressive strength can be roughly estimated its bending strength. The greater the general bending strength, the more difficult the sheet to break.
According to "JC205-92 natural granite building board" standard, bending strength is not less than 8.0 MPa, according to "JC79-92 natural marble building board" standard, the bending strength shall not be less than 7MPa
For example, the flexural strength of Granite Red is 23.56 MPa, and the flexural strength of marble Dandong Green is 8.57 MPa.
What is the bulk density and water absorption of the stone?
The bulk density is the ratio of the mass and volume of the stone. The high density indicates that the rock has a large specific gravity and volume, and it has a high stability in the sawing, grinding, polishing, cutting, and other processing processes.
The water absorption rate refers to the water absorption capacity of the stone, which reflects the number, size, distribution and connectivity of the pores contained in the stone.
The water absorption rate of the rock is generally less than 1.5%. The <0.5% can be regarded as good anti-weathering performance, good frost resistance, and no frost resistance performance test.
What is gloss?
Gloss is one of the important contents of evaluating the quality of decorative stone. In addition to color and variety, it is the main basis for users to measure the quality of stone.
According to the "JC79-92 natural marble building board" standard, marble mirror plate according to the different chemical components, the minimum gloss requirements (qualified products) are not less than 70,60,40 gloss units.
According to “JC205-92 Natural Granite Building Boardâ€, the minimum gloss requirement must not be less than 75 gloss units.
Sheet marble
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