Softening point test procedures for a long time recommended - Database & Sql Blog Articles

Test - lowercase jpg

Kaixin micro test

Test probe P100-M3

Programmable Package SG-8018CA(SG7050C) 0.67M~170M

1. Prepare the sample. The sample is higher than the torus. After cooling at room temperature for 30 minutes, clamp the sample ring with a clamp ring, and scrape the sample on the torus with a hot scraper to make the torus flush.

Second, the sample, metal bracket, steel ball, steel ball positioning ring placed in a constant temperature water tank of 5 ° C ± 0.5 ° C for at least 15min.

3. Inject the new boiling water into the beaker and cool it to 5 ° C. The water surface is higher than the depth mark on the pole.

4. Take the sample from the constant temperature water tank and place it on the hole in the middle layer of the bracket. Place the positioning ring, then put the whole ring frame into the beaker to adjust the water surface to the depth mark.

5. Move the beaker to the heater with the asbestos net, start the stirrer, start heating, and adjust the water temperature to 5 °C ± 0.5 °C per minute within 3 min, and record the rising temperature value per minute.

6. The sample is softened by heat, and the steel ball gradually falls down. When it comes into contact with the surface of the lower floor, the temperature is read to the nearest 0.5 °C.

The sample ring was placed on the bottom plate of the sample coated with the glycerol talc powder release agent, and the prepared asphalt sample was slowly injected into the sample ring to slightly above the annulus. If the softening point of the sample is estimated to be higher than 120 ° C, the sample ring and the sample bottom plate (without the glass plate) should be preheated to 80-100 ° C. After the sample was cooled at room temperature for 30 min, the sample cup was sandwiched by a ring clamp, and the sample on the torus was scraped off with a hot scraper to make it flush with the annulus.

Folding test procedure

1 sample softening point below 80 ° C:

a. Place the sample ring containing the sample together with the sample bottom plate in cold water (5 soil 0.5) °C for at least 15 minutes; at the same time, place the metal bracket, steel ball, steel ball positioning ring, etc. In the sink.

b. Inject a new boiling water into the beaker and cool it to 5 ° C. The water surface is slightly lower than the depth mark on the pole.

c. Take the sample ring containing the sample from the bath water and place it in the round hole of the middle plate of the bracket, and put the positioning ring; then put the whole ring frame into the beaker, adjust the water surface to the depth mark, and keep the water temperature at (5 soil 0.5) °C. Note that no bubbles can be attached to any part of the ring. A thermometer of 0-80 ° C is inserted vertically from the center hole of the upper plate so that the bottom of the end temperature measuring head is flush with the bottom of the sample ring.

d. Move the beaker containing water and ring frame to the heating stove with the asbestos net, then place the steel ball in the center of the sample in the middle of the positioning ring, and immediately heat it to adjust the water temperature in the cup to 3 minutes. Rise every minute (5 ± 0.5) °C. Note that during heating, if the temperature rise rate exceeds this range, the test should be repeated. e. The sample is gradually softened by heat softening, and when it comes into contact with the surface of the lower substrate, the temperature is immediately read to 0.5 °C.

2 sample softening point above 80 ° C:

a. The sample ring containing the sample and the sample bottom plate are placed in a heat preservation tank containing glycerin (32 soil 1) °C for at least 15 minutes; at the same time, the metal bracket, the steel ball, the steel ball positioning ring, etc. are also placed in the glycerin. in.

b. Inject a glycerin preheated to 32 ° C in the beaker with a liquid level slightly below the depth mark on the pole.

c. The sample loop containing the sample was taken out from the holding tank and measured according to the method of the above (1), and the temperature was read to 1 °C.

Fold report

The same sample is tested in parallel twice. When the difference between the two measured values ​​meets the accuracy requirements of the repeatability test, the average value is taken as the softening point test result, which is accurate to 0.5 °C.

Folding precision or tolerance

(1) When the softening point of the sample is less than 80 ° C, the allowable difference in repeatability test accuracy is 1 ° C, and the allowable difference in reproducibility test accuracy is 4 ° C.

(2) When the softening point of the sample is equal to or greater than 80 ° C, the allowable difference in repeatability test accuracy is 2 ° C, and the allowable difference in reproducibility test accuracy is 8 ° C.