GB/T 38050-2019 Determination of Permeability of Emulsified 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: GB/T 38050—2019
• Chinese name: Determination of Permeability of Emulsified Asphalt
• English name: Test method for permeability of emulsified asphalt
• Replacement relationship: not provided in the available source (the foreword only states that it was drafted in accordance with GB/T 1.1—2009, and does not mention replacing any standard)
• Publication/implementation: published in 2019-10-18, implemented in 2020-05-01
• Proposed by and under the jurisdiction of: National Technical Committee for Standardization of Petroleum Products and Lubricants (SAC/TC 280)
• Drafting organizations: Harbin Institute of Technology, China University of Petroleum (East China), Zhengzhou Xinghe Road Industry Technology Co., Ltd., Liaoning Provincial Transportation Construction Investment Group Co., Ltd., Henan Expressway Development Co., Ltd.
• Main drafters: Tan Yiqiu, Shan Liyan, Hu Zengfu, Fan Weiyu, Xu Huining, Zhang Lei, Song Xianhui, Wang Zhongping

2. Scope of application and non-applicability

• This standard specifies the method summary, instruments and materials, test preparation, test steps, calculation, report, and precision for the permeability test of emulsified asphalt.
• It is applicable to the determination of the permeability of emulsified asphalt.
• Within the capability range allowed by the test equipment, this standard can also be used to determine the permeability of cutback asphalt.
• Non-applicable scope: not provided in the available source.

3. Method principle

A certain mass of measured sand is loaded into a glass tube of specified dimensions. The mass of measured sand penetrated by the emulsified asphalt in 10 min is determined, converted by calculation into the height of penetrated measured sand, and expressed by the permeability coefficient. (See Chapter 4 Method summary)

4. Reagents and materials (purity / preparation)

• Measured sand: sieve measured sand of 0.15 mm~0.3 mm 1 kg, place it in a tray, put it into an oven at 110 ℃±2 ℃ and heat for 2 h, then place it in a desiccator for later use (6.2).
• Standard sand: meets the requirements of GB/T 17671 (5.11).
• Emulsified asphalt sample: weigh about 50 g of emulsified asphalt according to the method specified in GB/T 11147, pour it into a 100 mL beaker for later use (6.1).
• Other reagents: not provided in the available source.

5. Instruments and equipment

• 5.1 Emulsified asphalt permeability tester: see Figure 1, in which the glass funnel dimensions are shown in Figure 2 and the glass tube dimensions are shown in Figure 3.
  • Glass funnel: upper opening diameter is 60 mm±0.2 mm, total length is 110 mm±0.2 mm (Figure 2).
  • 50 mL glass tube: tube height is 175.1 mm±0.2 mm, inner diameter of the tube is 22.9 mm±0.2 mm (Figure 3).
  • Instrument composition (Figure 1): 1—— base; 2—— vertical plate; 3—— movable support plate; 4—— glass tube; 5—— funnel bracket; 6—— glass funnel.
• 5.2 Electronic balance: readability not greater than 0.1 g.
• 5.3 Timer: a stopwatch or other timing device with graduations of 0.1 s (or smaller), error within 0.05%, and an entire timing range of not less than 15 min may be used; electronic timing equipment with electronic coil frequency control accuracy within 0.05% may also be used.
• 5.4 Thermometer: range 0 ℃–100 ℃ (the source text source-text extraction is “.°C–100°C”, requires confirmation against the source standard (source-text extraction)), division not greater than 1 ℃.
• 5.5 Vernier caliper: range 200 mm, accuracy not lower than 0.02 mm.
• 5.6 Standard sieves: standard sieves with aperture 0.15 mm and 0.3 mm.
• 5.7 Beakers: one beaker each of volume 10 mL and 100 mL.
• 5.8 Crucible: one 50 mL crucible.
• 5.9 Oven: temperature control not lower than 150 ℃, precision not greater than 1 ℃, equipped with an automatic temperature regulator.
• 5.10 Desiccator.
• 5.11 Standard sand: meets the requirements of GB/T 17671.

6. Recommended operating conditions

• Test environment temperature: the test is conducted in a laboratory at 25 ℃±0.1 ℃ (7.1).
• Measured sand drying conditions: heated in an oven at 110 ℃±2 ℃ for 2 h (6.2).
• Emulsified asphalt addition rate: added uniformly into the glass tube within 30 s (7.6).
• Permeation timing time: 10 min (7.7).
• Other conditions: not provided in the available source.

7. Sampling and sample preparation

• Emulsified asphalt: weigh about 50 g of emulsified asphalt according to the method specified in GB/T 11147, pour it into a 100 mL beaker for later use (6.1).
• Measured sand: sieve measured sand of 0.15 mm~0.3 mm 1 kg, place it in a tray, put it into an oven at 110 ℃±2 ℃ and heat for 2 h, then place it in a desiccator for later use (6.2).
• Instrument preparation: place the emulsified asphalt permeability tester on a horizontal platform, and adjust the four supports of the instrument so that the level bubble is centered (6.3).

8. Analysis steps

• 7.1 Conduct the test in a laboratory at a temperature of 25 ℃±0.1 ℃.
• 7.2 Use T0331—1994 in JTG E42—2005 (Test for bulk density and compacted density of fine aggregate) to measure the bulk density of the measured sand (g/cm³), recorded as ρ.
• 7.3 Use a vernier caliper to measure the inner diameter of the glass tube in the emulsified asphalt permeability tester (mm), recorded as d.
• 7.4 Weigh the mass of the empty crucible, recorded as m₀.
• 7.5 Weigh measured sand with a mass of 65 g±0.1 g, recorded as m₁, weighed to the nearest 0.01 g, and add the measured sand through the funnel into the glass tube of the emulsified asphalt permeability tester.
• 7.6 Weigh emulsified asphalt with a mass of 7 g±0.1 g and pour it into a 10 mL beaker, weighed to the nearest 0.01 g; through the glass funnel in 5.1, add the weighed emulsified asphalt uniformly into the glass tube within 30 s, and start timing when the emulsified asphalt contacts the surface of the measured sand in the glass tube.
• 7.7 When the permeation time reaches 10 min, immediately open the movable support plate downward, and place the measured sand in the lower part of the glass tube that has not been penetrated by the emulsified asphalt into the crucible. During this process, if part of the measured sand penetrated by the emulsified asphalt falls down, the test should be conducted again.
• 7.8 Quickly weigh the mass of the crucible and measured sand, recorded as m₂, weighed to the nearest 0.01 g.

9. Qualitative and quantitative determination and calculation formula

Calculate and report the permeability coefficient of the emulsified asphalt using formula (1):

S = 400×(m₁ − m₂ + m₀) / (π×d×ρ)　……（1）

Where:

• S—— permeability coefficient, in centimeters (cm);
• m₁——total mass of measured sand, in grams (g);
• m₂——mass of unpenetrated measured sand and crucible, in grams (g);
• m₀——mass of the empty crucible, in grams (g);
• d——50 mL inner diameter of the glass tube, in millimeters (mm);
• ρ—— bulk density of the measured sand, in grams per cubic centimeter (g/cm³).

Note: The source equation is garbled. The displayed formula was reconstructed from context and symbol descriptions; its coefficient and denominator remain unverified and must be checked against the original before calculation.

10. Precision

• 10.1 General rule: the following rules are used to judge the acceptability of permeability coefficient test results (confidence interval of 95%).
• 10.2 Repeatability: in the same laboratory, by the same operator using the same instrument, according to the same test method, and within a short period of time, the absolute difference between two test results obtained from independent tests on the same test object shall not exceed 0.07 cm.
• 10.3 Reproducibility: in different laboratories, by different operators using different instruments, according to the same test method, the absolute difference between two test results obtained from independent tests on the same test object shall not exceed 0.50 cm.

11. Report

• Take the average value of 3 tests as the reported value of the permeability coefficient, retaining two significant figures after the decimal point.
• At the same time, record the bulk density of the measured sand.

12. Referenced documents

• GB/T 11147 Asphalt sampling method
• GB/T 17671 Method for strength test of cement mortar
• JTG E42—2005 Highway engineering aggregate test procedures (including T0331—1994 Test for bulk density and compacted density of fine aggregate)

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