QDK automatic dynamic anti-cracking tester instructions 1. QDK type automatic dynamic anti-crack tester test method:
1. The frame was placed on a 200 x 150 (mm) asbestos cement board. The prepared putty is scraped into the frame.
2. Remove the frame and apply the asbestos cement board for 7 days in a standard environment. Three test panels shall be prepared for each sample at the same time.
3. Fix the cured test board to the work surface of the instrument. After the power switch is turned on, the rising switch is started, and the cutting edge slowly rises.
4. The cutting edge continues to rise slowly. At this point, you should pay attention to the blank area of ​​the asbestos board. When the crack is found, use a vertical reading microscope to observe and record the crack width until the layer of the putty layer is cracked. After starting the stop switch, the cutting edge no longer rises.
5. Record the maximum width of the crack in the asbestos cement board before the cracking of the putty layer. Accurate to 0.02 mm.
6. Start the down switch to return the cutting edge.
7. Loosen the test plate retaining nut and pressure plate and remove the test plate. Repeat the above test procedure while placing another test plate.
Second, QDK automatic dynamic anti-cracking tester use precautions:
1. When the putty is applied, the surface should be smooth and free of air bubbles.
2. When removing the frame, pay attention to the edge of the putty layer, and there should be no cracking or damage.
3. When reading with a reading microscope, the cutting edge should not be ablated to prevent the asbestos cement board from retracting.
1. The frame was placed on a 200 x 150 (mm) asbestos cement board. The prepared putty is scraped into the frame.
2. Remove the frame and apply the asbestos cement board for 7 days in a standard environment. Three test panels shall be prepared for each sample at the same time.
3. Fix the cured test board to the work surface of the instrument. After the power switch is turned on, the rising switch is started, and the cutting edge slowly rises.
4. The cutting edge continues to rise slowly. At this point, you should pay attention to the blank area of ​​the asbestos board. When the crack is found, use a vertical reading microscope to observe and record the crack width until the layer of the putty layer is cracked. After starting the stop switch, the cutting edge no longer rises.
5. Record the maximum width of the crack in the asbestos cement board before the cracking of the putty layer. Accurate to 0.02 mm.
6. Start the down switch to return the cutting edge.
7. Loosen the test plate retaining nut and pressure plate and remove the test plate. Repeat the above test procedure while placing another test plate.
Second, QDK automatic dynamic anti-cracking tester use precautions:
1. When the putty is applied, the surface should be smooth and free of air bubbles.
2. When removing the frame, pay attention to the edge of the putty layer, and there should be no cracking or damage.
3. When reading with a reading microscope, the cutting edge should not be ablated to prevent the asbestos cement board from retracting.
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