SH/T 0424-1992 Determination of sag of petroleum 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 title / English name / replacement relationship

• Standard number: SH/T 0424—92 (confirmed in 1998)
• Chinese title: Determination of sag of petroleum asphalt
• English title: not provided in the available source
• Replacement relationship: replaces ZB E43 002—88
• Adoption relationship: equivalent adoption of the sag determination method in Japanese Industrial Standard JIS K 2207—1980 "Petroleum Asphalt"
• Approval/implementation: approved by China Petrochemical Corporation 1992-05-20, implemented on 1992-05-20

2. Scope of application and non-applicability

• This standard specifies the method for determining the sag of petroleum asphalt.
• This standard is applicable to determining the heat resistance of petroleum asphalt with a softening point above 95°.
• Not applicable: not provided in the available source.

3. Method principle

Adhere an asphalt specimen to the test plate in the specified size and shape, then suspend the test plate vertically in an oven at a constant temperature of 70℃±2° and maintain for 5h. Measure the distance of creep sag of the specimen under heat, expressed in millimeters.

4. Reagents and materials (purity / preparation)

• Silicone grease: purity specification not provided in the available source.
• Glycerol-dextrin (1:1) release agent: specific preparation instructions not provided in the available source.
• Release agent application requirement: apply silicone grease or glycerol-dextrin (1:1) release agent to the cut section of the template, taking care not to apply too much (4.2).

5. Apparatus and equipment

• 3.1 Test plate: machined from 1Cr8Ni9Ti stainless steel. The plate dimensions are as shown in Figure 1, thickness 3mm. One side of the plate has a hole so that it can be suspended vertically in the oven.
• 3.2 Template: brass product, dimensions and shape as shown in Figure 2.
• 3.3 Oven: capable of automatic constant temperature at 70℃±2℃.
• Note: The dimensions in Figures 1 and 2 are severely garbled in the source transcription. Verify the complete drawings and dimensions against the original; do not use the extracted dimensions as verified construction specifications.

6. Recommended operating conditions

• Oven temperature: 70℃±2℃ (3.3, 5.1).
• Constant temperature holding time: 5h (2, 5.1).
• Specimen cooling: cool at room temperature for 30min (4.3).
• After removing the template, standing at room temperature: 15min (4.4).
• Heating and melting temperature: should not exceed the softening point of the specimen by more than 90° (4.1).

7. Sampling and specimen preparation

• 4.1 To avoid local overheating of the specimen, heat and melt at as low a temperature as possible while stirring slowly and preventing air bubbles from entering the specimen. The heating temperature should not exceed the softening point of the specimen by more than 90°.
• 4.2 Place the test plate horizontally, and apply silicone grease or glycerol-dextrin (1:1) release agent to the cut section of the template. Place it on the test plate as shown in Figure 1. Take care not to apply too much release agent.
• 4.3 Pour the heated specimen into the template so that it is slightly above the template surface, and cool at room temperature for 30min. Use a hot knife to cut off excess specimen along the template surface, then remove the template.
• 4.4 After removing the template, allow the specimen adhered to the test plate to stand at room temperature for 15min.
• Initial length of specimen: 60mm (see Section 6).

8. Analytical procedure

• 5.1 Suspend the test plate with the adhered specimen vertically in a constant-temperature oven at 70℃±2℃ and maintain for 5h.
• 5.2 After 5h, take out the test plate and measure the maximum length of each specimen along the long edge direction.

9. Qualitative and quantitative determination and calculation formula

• Take the maximum among the differences between each measured value and the initial length 60mm as the sag of the specimen, in millimeters (Section 6).
• Calculation formula: not provided in the available source in formula form, only expressed in words as "the maximum among the differences between each measured value and the initial length 60mm".

10. Precision

Not provided in the available source.

11. Report

Take the maximum among the differences between each measured value and the initial length 60mm as the sag of the specimen, in millimeters.

12. Referenced documents

• JIS K 2207—1980 "Petroleum Asphalt" (source of equivalent adoption)
• ZB E43 002—88 (replaced standard)
• Other referenced documents: not provided in the available source.

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 Q&A