Asphalt penetration standard test needle

Asphalt penetration standard test needle

According to the national standard "Determination of Penetration of Petroleum Asphalt" (GB4509)—84) "Made of hardened and tempered stainless steel through precision processes such as vacuum quenching, and strictly inspected according to the requirements specified in national standards to ensure that all indicators are qualified before leaving the factory, it is a measuring tool for determining the penetration of petroleum asphalt.

Meets the American standard ASTMD5—75 (1978) and JTG E20-2011 Test Code for Asphalt and Asphalt Mixtures in Highway Engineering.

Technical Indicators:

1. The total mass of the needle and needle rod is 2.5g ± 0.05g,

2. Needle rod diameter 3.2 ± 0.02mm,

3. Needle rod length 38 ± 1mm;

4. The diameter of the needle is 1.00-1.02mm,

5. The length of the needle is 50 ± 1mm,

After embedding the needle rod, the exposed length should be 40-45mm. In addition, the length of the needle rod should be within (78-83) ± 1mm. The needle tip angle should be between 8 ° 40 'and 9 ° 40'.

Instructions for Use:

Penetration is one of the main quality indicators of asphalt. It is an indicator that reflects the relative viscosity of asphalt under certain conditions, indicating the degree of softness and consistency of asphalt, as well as its ability to resist shear failure.

At 25 ℃ and for 5 seconds, under a load of 100 grams, the standard will penetrate the asphalt sample vertically to a depth of 1/10 millimeter as the penetration degree.

Usage precautions:

When using a measuring rod for depth measurement, it should be lightly pressed and lifted, and must not be quickly impacted.

When it is necessary to lift the needle connecting rod again, the release button should be pressed instead of pulling it while the needle connecting rod is locked to avoid wear on the needle connecting rod and rod sleeve.

3. After each experiment, the test needle should be removed, protected with oil, and placed in a protective sheath.