SH/T 0422-2000 Determination of Ash in Asphalt

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

1. Method number / full name / English name / replacement relationship

• Standard number: SH/T 0422-2000
• Chinese name: Determination of Ash in Asphalt
• English name: Standard test method for ash in bitumen
• Replacement relationship: replaces SH/T 0422-1992 "Determination of Ash in Petroleum Asphalt"
• Equivalent adoption: ASTM D2415—1966 (confirmed in 1991) "Determination of Ash in Asphalt"
• Main differences from SH/T 0422-1992 (as listed in the original text):
  1. Different precision: this standard not only adds a reproducibility requirement, but the repeatability requirement has also been improved.
  2. Different sample amount: in SH/T 0422-1992 the sample amount is 3～5g; this standard specifies a sample amount of 100g (the original text is "logo", requires confirmation against the source standard (source-text extraction)).
  3. Different calcination temperature: in SH/T 0422-1992 the calcination temperature is 800℃±20℃; this standard specifies a calcination temperature of 900℃±10℃.
• Additional note: for asphalt samples with ash greater than 1%, this standard may also be used for testing, but no specific precision requirement is made.
• Proposing unit: China Petrochemical Corporation
• Technical committee: Heavy Oil Research Institute, University of Petroleum (East China)
• Drafting unit: Heavy Oil Research Institute, University of Petroleum (East China)
• Main drafters: Wang Cuihong, Zhang Xiaoying, Qian Cangyuan
• Approval: approved by the State Bureau of Petroleum and Chemical Industry 2000-04-10
• Implementation: implemented on 2000-10-01

2. Scope of application and non-applicability

• This standard is suitable for determining the ash content of asphalt.
• For asphalt samples with ash greater than 1%, this standard may also be used for testing, but no specific precision requirement is made.
• Not applicable: not provided in the available source.

3. Method principle

After asphalt is burned and calcined, the remaining inorganic substance is ash, expressed as a mass percentage.

4. Reagents and materials (purity / preparation)

Not provided in the available source.

5. Instruments and equipment

• 5.1 High-temperature furnace: capable of controlling the temperature at 900℃±10℃.
• 5.2 Crucible: porcelain, silica, or platinum, capacity 35～45mL, top opening diameter 55～60mm, with lid.
• 5.3 Sieve: 600μm (30 mesh).
• 5.4 Desiccator.
• 5.5 Crucible tongs.
• 5.6 Electric furnace.
• 5.7 Porcelain triangle.
• Note: the porcelain crucible may be used until the porcelain glaze on its inner surface is damaged.

6. Recommended operating conditions

• Calcination temperature: 900℃±10℃.
• Crucible ignition time: 1h (7.1).
• Sample calcination time: 30min (7.5).
• Weigh after cooling to room temperature in a desiccator.
• Other recommended operating conditions: not provided in the available source.

7. Sampling and sample preparation

• 6.1 Sampling shall be carried out in accordance with GB/T 11147.
• 6.2 Sample dehydration: when the water content exceeds 0.5%, dehydration shall be carried out first.
  • 6.2.1 For solid samples, air-drying dehydration is used.
  • 6.2.2 For semi-solid and liquid samples, dehydration is carried out by heating and evaporation, with the temperature not exceeding 150℃; when light fractions volatilize, the light fractions shall be recovered and then returned to the sample.
• 6.3 Sample filtration
  • 6.3.1 For solid samples, take at least 100g of sample and grind it; take the portion passing through a 600μm (30 mesh) sieve as the test sample.
  • 6.3.2 For semi-solid and liquid samples, heat to the flow temperature and filter through a 600μm (30 mesh) sieve. The sample heating time shall not exceed 10min (the original text is "lonr ino", requires confirmation against the source standard (source-text extraction)).

8. Analysis procedure

• 7.1 Place a clean crucible in a high-temperature furnace at 900℃±10℃ and calcine for 1h, cool in air for 3min, then place the crucible in a desiccator, cool to room temperature, and weigh to the nearest 0.0001g.
• 7.2 Repeat 7.1 until the difference between consecutive weighings does not exceed 0.0004g, and record the crucible mass as M1.
• 7.3 Transfer about 10g of the sample treated according to 6.2 and 6.3 into the crucible, weigh to the nearest 0.0001g, and record as M2.
• 7.4 Place the crucible containing the sample on an asbestos board hole or on an electric furnace, and heat slowly in a fume hood. If vapor ignites, immediately cover the crucible with the crucible lid and quickly extinguish it. Control the heating and do not allow the asphalt to overflow from the edge of the crucible.
• 7.5 When only carbonaceous residue remains in the crucible, transfer the crucible to a high-temperature furnace and calcine at 900℃±10℃ for 30min. Remove the crucible, cool in air for 3min, then place the crucible in a desiccator, cool to room temperature, and weigh to the nearest 0.0001g.
• 7.6 Repeat 7.5 until the difference between consecutive weighings does not exceed 0.0004g, and record as m3.

9. Qualitative and quantitative determination and calculation formula

Ash is calculated by the following formula, expressed as a mass percentage:

Ash, % = 100(m3 − M1)/(m2 − M1)

Where:

• M1—— crucible mass, g;
• m2—— mass of crucible and sample, g;
• m3—— mass of crucible and ash, g.

10. Precision

The following provisions are used to judge the acceptability of results (95% confidence level).

• 10.1 Repeatability: the difference between two results of repeated determinations by the same operator shall not exceed 0.01%.
• 10.2 Reproducibility: the difference between results determined by two laboratories shall not exceed 0.03%.

11. Report

Take the arithmetic mean of the two determination results as the determination result, and report the ash mass percentage to 0.01%.

12. Referenced documents

• GB/T 11147 Sampling method for petroleum asphalt

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick-reference Q&A