Asphalt dynamic viscometer <Installation and use method>-华强电子网

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

MOS power IC full range

KKST patch plug-in active passive crystal oscillator hot sale 24.576000MHZ

one,

Purpose and scope of application

The method is applicable to the determination of the viscosity of the viscous petroleum pitch by a vacuum decompression capillary viscometer. Unless otherwise noted, the test temperature was 60 ° C and the vacuum was 40 KPa. It complies with the JTJ052--2000 standard of the Ministry of Communications.

two,

Technical Parameters

1,

Power supply: 220V AC

2,

Temperature accuracy: ± 0.1 ° C

3,

Pressure range: 300 ± 0.5mmHg (40KPa)

4,

Timing range: 999.9S

5,

Timing accuracy: <0.05%

three,

Instrument installation and operation

1,

Connect the main unit and the vacuum pressurization system. Connect the vacuum tube of the vacuum pressurization system to the vacuum connection tube on the back of the main unit. Connect the main control cable to the vacuum decompression system plug. (See the instrument connection diagram for details)

2,

Add pure water to the water bath, and the water surface is about 10mm on the cylinder.

3,

Turn on the power, turn on the power switch, and set the test temperature. The factory setting is 60 °C. Turn on the stirring, heat, and the instrument automatically controls the temperature.

4,

The vacuum switch is turned on and the vacuum device is automatically adjusted to 300mmHg.

5,

The test piece is cured in a water bath for 30 minutes, the vacuum tube is inserted into the viscometer, and the start switch is pressed. When the test piece is sucked to the first mark line, the time switch is automatically counted, and the time switch is pressed every time. The automatic instrument automatically records the time of each segment.

6,

After the test is finished, press the stop switch to turn off the power switch.

Note; the liquid is pumped out!

four,

Methods and steps

1,

Ready to work

(1)

The viscosity of the sample is estimated, and the model of the vacuum capillary viscometer is selected according to the time during which the sample flows through the predetermined volume for 60 s or more.

(2)

The vacuum capillary viscometer is washed with a solvent such as trichloroethylene. If the viscometer is oily, it can be washed carefully with washing liquid, distilled water, etc. The washing is carried out in an oven or dried by hot air of cotton.

(3)

The asphalt sample was prepared according to T0602 of this procedure, and the dehydrated sieved sample was carefully heated to a sufficient flow state. When heating, stir it properly to ensure uniform heating. The sample was then poured into another small sampler that was easily filled into the capillary, in an amount of approximately 50 ML, and covered with a lid.

(4)

Heat the water tank and adjust the temperature to within 60 ° C ± 0.1 ° C. The thermometer should be tested beforehand.

(5)

The selected vacuum capillary viscometer and sample were placed in an oven (135 ° C ± 5 ° C) for 30 min.

2,

Experimental procedure

(1)

The heated viscometer is placed in a container, and then the heated asphalt sample is injected into the capillary viscometer from the charging tube A, the sample should not stick to the tube wall, and the sample liquid level is within 2 mm of the E-line line. .

(2)

The sampled capillary viscometer was placed back in an electric oven (135 ° C ± 5.5 ° C). The temperature of 10 min ± 2 min has caused the bubbles generated by the sample in the tube to escape.

(3)

Three capillary viscometers were taken out from the oven and cooled at room temperature for 2 min. They were installed in a constant temperature water bath maintained at the test temperature, and the position should be such that the I mark is at least 20 mm below the sink level. The viscometer should be taken out of the oven and the operation time to be placed in the constant temperature water tank should be controlled within 5 minutes.

(4)

Connect the vacuum system to the viscometer and close the piston or valve.

(5)

The vacuum pump was turned on to achieve a vacuum of 40 kPa (300 mmHg ± 0.5 mmHg).

(6)

After the viscometer is kept in the constant temperature water tank for 30 minutes, open the valve connected to the decompression system. When the sample is sucked to the first marking line, press the timing switch at the same time to measure the interval between consecutive pairs of marking lines, accurate to 0.1s, record The first super 60s marking number and interval.

(7)

In this way, the other two viscometers were tested in parallel.

3,

After the test, the capillaries were taken out of the constant temperature water bath and washed in the following order.

(1)

Pour the capillary into an appropriately sized beaker and place it in an oven preheated to 135 ° C for about 0.5 h to 1 h to allow the asphalt in the capillary to flow out sufficiently, but not too long, so that the asphalt is not attached to the tube.

(2)

Remove the beaker and capillary from the oven and gently wipe the asphalt around the capillary opening with a clean cotton yarn.

(3)

Inject the trichloroethylene solvent from the sample nozzle, and then use the suction ear to align the upper end of the capillary. The asphalt is gradually dissolved, sucked out from the capillary port, and enters the suction ear ball, repeated several times. Until the injected trichloroethylene is clear and transparent, it is washed with distilled water, dried, and stored for later use.

Fives,

Calculation

The viscosity of asphalt power is calculated according to formula (1)

ク

=K xt (1)

In the middle

ク

- the dynamic viscosity of the asphalt sample at the measured temperature, pa.s;

K--Select the first pair of viscometer constants of a pair of marking lines over 60s pa.s / s;

T--through the time interval of the first pair of lines exceeding 60s, s

six,

Precision or tolerance

The tolerance of the repeatability experiment is 7% of the average value; the tolerance of the reproducibility test is 10% of the average value