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The use method and calculation formula of digital display Brinell specific surface area tester

Release time: September 6, 2020 popularity: two hundred and fifty-nine

Digital display Brewster specific surface area tester usage method:

The use method and operation steps of this instrument can refer to the relevant provisions of gb8074-87 determination method of specific surface area of cement - Brinell method

1. Calibration of instrument:

Standard sample - Calibration of the test instrument using gsb14-1511 standard sample. The standard samples should be kept at the same room temperature before use.

1.2 determination of sample layer volume:

The following mercury displacement method is used to determine the volume of sample layer: (see Table 1 for density and air viscosity of mercury at test temperature)

2. Sample preparation:

2.1 pour the standard sample dried at 110 ℃± 5 ℃ and cooled to room temperature into a 100ml closed bottle and shake it vigorously for 2 min. after standing for 2 min, open the bottle cap and stir gently to distribute the fine powder on the surface during the loosening process to the whole sample.

2.2 cement samples shall pass through 0.9mm square hole sieve, then dried at 110 ℃± 5 ℃ and cooled to room temperature.

2.3 determination of sample quantity: the weight of standard sample used for calibration test and the weight of cement to be determined shall reach the void ratio of 0.500 ± 0.005 in the prepared sample layer, and the calculation formula is as follows:

W=ρv(1-ε)

Where: W - required sample quantity;

ρ - sample density (g / cm3);

V-volume of sample layer (cm3) determined according to section 4.1.2;

ε - void ratio of test material layer (Note 1).

Note 1: porosity refers to the ratio of the volume of pores in the test material layer to the total volume of the test material layer. Generally, 0.5000 ± 0.005 is used for cement. If the sample quantity calculated according to the above formula can not accommodate the effective volume of the cylinder, or the effective volume of the cylinder can not be filled after tamping, it is allowed to change the void ratio appropriately.

3. Preparation of test material layer: put the perforated plate on the flange of the air permeable cylinder, with the marked side facing down, send a piece of filter paper (see Note 2) to the perforated plate with the edge pressed. Weigh the cement amount determined in section 4.2.3 to 0.001g and pour it into the cylinder. Tap the edge of the cylinder to make the surface of the cement layer flat. Then put in a piece of filter paper and tamp the sample evenly until the supporting ring of the vibrator contacts the top edge of the cylinder. Rotate for two weeks, and slowly take out the vibrator. Insert the air permeable cylinder into the cylinder base for operation when preparing the test sample.

Note 2: the filter paper on the perforated plate should be a disc with the same inner diameter and smooth edge as the cylinder. New filter paper is needed for each determination, and medium speed quantitative filter paper is used.

4. Test process:

4.1. When the power supply is turned on, the display will display the ambient temperature at that time. It is necessary to preheat for 15 minutes after starting the machine, and the test can be carried out after the temperature sensor is stable.

4.2 air leakage inspection:

Add distilled water into the barometer until the water level is below the mark line (water level mark). Plug the right end pipe orifice of the barometer body with a rubber plug. Press the "air leakage check" key on the keyboard, and the instrument will automatically open the suction pump and solenoid valve. When the liquid level rises to the * mark above the barometer body, the photoelectric switch at the * mark will act. After three seconds, the pump and valve will close and the liquid level will stop rising. If there is no air leakage in the system, the liquid level will remain unchanged, and "good" will be displayed on the display one minute later. On the contrary, if the system leaks air, the liquid level will drop. When the liquid level drops, a string of cursors will be displayed on the display to indicate the system is leaking. If this happens, it can be solved by checking the joints of pipes and sealing them with piston grease. No matter whether there is air leakage or not, after checking, press "confirm" key to restore the instrument to the display temperature state.

4.3 calibration: (if the sample to be tested is cement, do not calibrate it. Just press the "parameter input" key instead of the password. Press the "confirm" key to check the corresponding parameters, and then input the density and porosity of the tested sample into the instrument directly

The calibration steps are as follows: (a calibration example)

Users are not allowed to enter the "calibration" status at will, otherwise the factory calibrated data will be replaced.

Note 3: in the calibration process, except that the ambient temperature and liquid level falling time are automatically sampled by the instrument, other parameters can be modified according to the actual situation. See 4.4 for the ventilation test process of item L).

4.4 air permeability test:

Take off the rubber plug and replace it with a porous cylinder with the sample to be tested. To ensure close connection, a thin layer of piston grease can be coated on the lower cone surface of the cylinder to avoid air leakage, and then insert it into the conical grinding hole at the top of the barometer body, rotate for two weeks, and the prepared sample layer can not be vibrated. Press the "air permeability test" key on the keyboard, the instrument will automatically open the air pump and solenoid valve, and the liquid level will continue to rise steadily. When the liquid level rises to the * mark on Zui of the barometer body, * photoelectric switches will act, the high cursor of Zui on the display will be on. After three seconds, the pump and valve will be closed, and the liquid level will stop rising. When the liquid level drops to a mark above Zui, the number of tests will be displayed on the display When the second marking line of the instrument starts, the second time will be displayed. When the liquid level continues to drop to the third scribe line (timing terminal marking), the third photoelectric switch acts and the timing stops. The measured time is displayed on the display. Press the "confirm" key, the measured data is stored, and the environment temperature is displayed on the display. So far, the test is over. Repeat the above process. If the difference between the time data measured twice is less than one second, the test is finished, press the "confirm" key, and the ambient temperature will be displayed on the screen. If the time data difference between the two times is greater than one second, the third test shall be repeated according to the above method. After several tests, the liquid level falling time value corresponding to the test serial number can be found out through the "check" key, and the time value beyond the specified range can be cleared by pressing the "clear" key.

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fifteen billion eight hundred and thirty-three million seven hundred and eighty-nine thousand and two