Testing methods for stone materials
2023-11-27 14:39
Testing methods for natural decorative stone materials
GB/T 99663-2001 Test Methods for Natural Decorative Stones Part 3: Test Methods for Bulk Density, True Density, True Porosity, and Water Absorption
1 Scope
This standard specifies the equipment and measuring tools, specimens, test procedures, result calculations, and test reports used for the volumetric density, true density, true porosity, and water absorption of natural decorative stone.
This standard is applicable to the volume density, true density, true porosity, and water absorption tests of natural decorative stone.
2 Equipment and measuring tools
2.1 Drying oven: The temperature can be controlled within the range of 105 ℃± 2 ℃.
2.2 Balance: Maximum weighing 1000g, sensitivity 10mg; The maximum weight is 200g, and the sensitivity is 1mg.
2.3 Pycnometer: Volume 25mL to 30mL.
3 samples
3.1 Bulk density and water absorption sample: The sample is a cube with a side length of 50mm or a cylinder with a diameter and height of 50mm, with a dimensional deviation of ± 0.5mm. Five yuan per group. The sample is not allowed to have cracks.
3.2 True density and true porosity samples: Take about 1000g of clean samples and crush them into particles smaller than 5mm; Reduce to 150g using the quartering method, and then grind it into a porcelain mortar that can pass through 63? M standard sieve powder.
4 Test steps
4.1 Bulk density and water absorption rate
4.1.1 Place the sample in a drying oven at 105 ℃± 2 ℃ and dry it to a constant weight. The difference in mass between two consecutive times should be less than 0.02%. Cool it in a dryer to room temperature. Weigh its mass (m0) to the nearest 0.02g.
4.1.2 Soak the sample in distilled water at 20 ℃± 2 ℃ for 48 hours, then remove it and wipe off the surface moisture of the sample with a wrung out wet towel. Immediately weigh its mass (m1) to the nearest 0.02g.
4.1.3 Immediately place the water saturated sample in a basket and immerse the basket and sample together in distilled water at 20 ℃± 2 ℃. Weigh the sample in water (m2) (note that when weighing, carefully remove any bubbles attached to the basket and sample), accurate to 0.02g.
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